9R4944 - 0424 - EPC BD Vol II - Exhibit C2.2 - Technical Specifications Annex B

EPC BD Azzawiya – Vol II – Exhibit C2 9R4944K0/0424/902503/Rott/Rev0 Final Report 23 June 2009

Annex B

Technical Specifications Workshop

CONSTRUCTION OF WORKSHOP FOR NEW HARBOR AT ARC, AZZAWIYA

SCOPE OF WORKS

General: Azzawiya Oil Refining Company (ARC) is planning to build workshop of size 2000x1000 cm for New Harbor on the site as shown in the Layout Plan No. 1624 CC-A0 71324. The Workshops shall be with reinforced concrete frames and roof. The construction of Workshop shall be as per design and technical specifications approved by ARC. The detailed design and engineering shall be prepared on the basis of drawings No. 1624-CC-A1-7160, 7161, 7162, 7163, 7164, 7165, 7166, 7167, 7168, 7169, 7170, 7171, 7172, 7173, 7174, 7175, 7176 and the technical specifications enclosed herewith. The Contractor shall provide under the Contract, the following Works, referred to hereinafter, in accordance with the Technical Specifications, and the provisions of the Contract and as per the criteria of good engineering practices for such works: 1. Provide and construct the Workshop building as per above mentioned

drawings, with reinforced concrete frames , Peripheral walls to be built with concrete hollow blocks, 25-cms thick, complete with internal and external plaster, internal and external paint as per approved drawings and technical specifications. The Workshop shall be provided with steel sliding doors, openable aluminum glass windows located at high level and reinforced concrete floors.

2. Provide and construct rooms on ground floors inside the workshop

building with RCC frame and masonry block walls using separate roof of the Workshop as per approved design on the basis of drawing No. 1624-CC-A1-7161. The rooms shall be complete with all doors, windows, Terrazzo flooring, plaster and paint. Also to provide a staircase of steel construction.

3. Supply and installation an overhead crane having capacity 5 tons for

Heavy Equipment Workshop. The crane shall provide services to the whole area of the Workshop. The Contractor shall provide catalogues for ARC’s approval from at least three Manufacturer of cranes from European countries.

4. Provide and construct a reinforced concrete ramp with stairs in the

Workshop as per approved design. The item shall include protective profiles comprising frames of angle iron section, wooden planks to cover the ramp opening, stair steps at both ends, lighting arrangement inside the ramp etc. all to make the ramp completely functional. The Contractor shall prepare detail design on the basis of plan of ramp as shown on the Drawing No. 1624-CC-A1-7171 .

SCOPE OF WORKS Construction of new Workshop

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5. Electrical Works:

Provide and execute electrical works in Workshop including supply and installation of all lighting and power circuits and equipments for internal and external electrical system with necessary connections to the existing system in the Refinery as per approved design and specifications. The Contractor shall provide design and related drawings with calculations and a list of materials for Owner's approval before commencing any construction work. The works shall also include supply and installation of air-conditioning units, split type, including automatic switch and electrical connections in the tools rooms inside the workshop (except toilets) .

6. Provide and construct approach road for workshop with Asphalt concrete

pavement as per approved design and technical specifications including earth work, formation of base course with granular materials, binder course and wearing course with asphalt concrete etc. complete as per specifications.

7. External Works:

7.1 Preparation of site by cutting and filling in order to bring the final formation level of the site. Backfilling shall be conducted in layers of 200-mm, well compacted upto 95% of maximum dry density of soil .

7.2 Supply and installation of wrapped firewater pipe of GRP pipe

approved by ARC of dia. 10” and 8” with a fire hydrant of dia. 8” three numbers gate valves of dia. 10” including necessary fittings for installation of pipes and tie-in with existing main fire fighting network.

7.3 Supply and laying of electrical armoured cable of proper size for

main power supply to connect the Workshop with the main distribution panels. including excavation in any kind of soil and backfilling etc. complete ready for operation as per technical specifications.

7.4 Provide and install light poles including cables for proper

lighting system of the approach road and inside area of pavement (outside workshop) as per International approved standard and specifications.

7.5 Supply and lay 5 pairs of fire alarm cable for wall mounted call

point connect main local fire alarm panels of the workshop to the fire alarm control junction box located at near place of ARC fire alarm system etc. complete ready for operation.

SCOPE OF WORKS Construction of new Workshop

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7.6 Supply and lay telephone cable of 10 pairs including supply of

all materials, excavation in any type of soil, laying, backfilling, etc. to connect telephone outlet sockets of the Workshop to near by Junction Boxes of existing telephone system.

7.7 Supply and lay external sewer line of dia. 250 mm, PVC pipe

including bends, fittings, joints of pipeline supports at bottom and tie-in with the existing sewer line, excavation in any soil, laying, backfilling etc.

7.8 Supply and lay drinking water supply line of G.I. pipe dia. 1½

inch. (internal dia.) including excavation in natural soil & back filling and connection with existing main water supply network.

7.9 Provide and construction of a reinforced concrete oil separator

of size 500x400 cm and depth 350 cm in the area of Workshop including drain line connection with the Inspection Pits.

7.10 Cleaning the site after construction of Workshop and other

associated works. 8. The contract shall include preparation of as built detailed drawings for

architectural, structural, electrical, fire alarm system, sanitary & plumbing, pavement, sewerage, water supply, road works, telephone system, etc. for ARC's approval drawings and drawings for all external works (Contractor to provide all structural calculations to the Owner for approval, before commencement of construction work). All external works shall be connected to the existing systems in the Refinery.

9. Mobilization to and demobilization from the site, all Temporary Works,

Construction Plants and labour etc. to perform the Works. 10. Any other works not mentioned above but may be necessary to make

the workshop and external works completely functional as per the Contract.

11. All documentation, as built drawings, calculations, cable routes, data

sheets, etc. shall be produced by the Contractor in electronic format. Hand copies required by the Owner shall be issued by the Contractor.

Fh 05/09

Technical Specifications Part 1: Structural works

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Technical Specifications Part 1: Structural works

Technical Specifications Part 1: Structural Works

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1.1 EARTHWORKS 1.1.1 EXCAVATION The excavation works shall be generally executed following the

requirements of BS 6031:1981. Excavation shall include clearing of all obstructions, excavating in

any type of soil or rock met with, disposal of excavated material, supporting sides of excavations, dewatering, cleaning drift sand and all other measures, necessary for the proper execution. Any boulders, logs or any other objectionable material encountered shall be removed.

When carrying out excavation works in order to expose existing

foundations, or excavation close by them, all care shall be taken not to disturb the integrity or damaging the same, nor to disturb the ground soil under them regardless of the reason, flooding, under-digging etc.

Suitable excavated material shall be deposited on soil heaps on the

site and shall be used for backfill. All unsuitable and excessive excavated material shall be loaded and removed from the site to a place as directed by the Engineer.

In excavation for foundation, the bottom layer of excavation,

minimum 20cm in thickness, shall be left undisturbed and subsequently removed by hand shovel operations only when the concrete blinding course is about to be placed in order to avoid softening or deterioration of the surfaces of the excavation.

1.1.1.1 Approvals After each excavation is completed, the Contractor shall notify the

Engineer to that effect and no concrete blinding course for footings shall be placed until the Engineer has approved the excavation and the character of the foundation material. The Engineer shall approve final level of excavations and determines suitable material for backfill.

1.1.1.2 Measurement Measurement shall be according to the net dimensions of the

structure. Slopes and other associated with the works shall be included into the unit rates for excavation.


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1.1.2 FILLING (BACKFILL) 1.1.2.1 General The works shall be executed following the requirements of BS 1377 :

1975. Locally excavated material shall be used for embankments and backfilling if suitable or if ordered so by the Engineer.

Backfilling shall not commence until foregoing operations such as

waterproofing, insulation and others have been inspected and approved by the Engineer.

1.1.2.2 Materials The material used for fill shall not contain organic matter, soluble

chemical substances with acid reactions and rubble with diameter above 75 mm.

Materials used for fill may also be sand, free from roots, lumps, clay

or other organic matter, well graded from fine to coarse aggregates. If sufficient suitable excavated materials are not available, the

Contractor shall obtain them from locations approved by the Engineer.

1.1.2.3 Workmanship Area filling shall be executed in layers, 15cm thick. Before starting

the next, the previous layer shall be leveled and moistened till obtaining an optimal water content.

Every successive layer should be executed with suitable thickness

and horizontally. 1.1.2.4 Testing Compaction of layers of paved areas should not be less than 95%,

while for unpaved areas not less than 90% according to BS 1377 : 1975 (Test No.13 or similar approved by the Engineer).


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1.1.3 HARDCORE 1.1.3.1 Materials Hardcore shall consist of crushed limestone graded from 5 to 30 mm,

free from lumps or balls of clay, sticks or other organic materials.

1.1.3.2 Workmanship Hardcore layer shall be carefully tamped. Water content shall be at

optimum during the compaction procedure. Surface of the layer shall be finished by blading and rolling to obtain true grades. Any section considered unsatisfactory shall be removed or reworked to get final satisfactory materials.

Places deficient in thickness shall be corrected by the Contractor by

scarifying, adding additional material, reblading, compacting and as directed by the Engineer.

1.1.3.3 Testing, Deviations Compaction shall be executed in accordance with BS 1377 : 1975.

The surface of the hardcore layer shall not have a deviation over 1cm when tested with a 3 meter level stuff.


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1.2 CONCRETE 1.2.1 GENERAL REQUIREMENTS The concrete works, including materials and concrete mixing,

delivery, placing, vibration, leveling and curing shall comply with the requirements of BS 8110, Part 1, Section 6.

1.2.1.1 Materials

a) Cement All cement shall be ordinary Portland cement unless otherwise

ordered by the Engineer and shall comply with the requirements of British Standard Specification No.12 ‘Ordinary Portland Cement’. Each consignment of cement shall be accompanied by the Manufacturer’s Certificate giving results of their tests.

Cement containing tricalcium aluminate in excess of 15% shall

not be used for structural purposes. The cement shall be stored on a base clear of the ground in dry

well ventilated shed if it is in sacks and in silos if loose.

b) Aggregates Coarse and fine aggregates shall be according to BS 882 and

shall originate from an approved source. Fine aggregate shall be within the limits of Table 2, Zones 1, 2 or 3 of BS 882. Coarse and fine aggregates shall be delivered and stored separately on site. Aggregates shall be stored on a clean hard base in separate compartments or in approved hoppers.

c) Water Water shall be according to BS 3148. Mixing water for use with

cement shall be from an approved source and shall be clean and free of injurious amounts of oil, alkali, acid, salt, organic matter or other deleterious substances.

d) Concrete The concrete shall be composed of cement, fine/coarse

aggregate and water in proportions to achieve a works cube strength as shown in particular specifications. The water/cement ratio and the proportions of fine to coarse


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aggregate shall be such that the concrete produced is homogenous, free of voids and maximum density. The concrete for RC structures shall be produced in compliance with the values of minimum cement content of Table No.3.4 (Clause 3.3.5) or Table No.6.1 of BS 8110 : 1985. The application of plasticizers with qualities certified by the manufacturer and in quantities as per the manufacturer’s specification is admissible in order to improve concrete workability and reduce the water/cement ratio of the concrete mix.

In case concrete is supplied from batching plant, batches shall

be accompanied with quality certificate. In all matters regarding the design mix, curing and placing of

concrete, the recommendation of the relative Code of Practice and B.S.S. shall be followed, except as limited or modified by this Specification. The following classes shall be used also with reference to C.P. 114 :

ORDINARY PORTLAND CEMENT CONCRETE

Cube Strength at 28 days after mixing

Class of Concrete

Nominal Mix (Proportion by Volume) Preliminary Test

(kg/cm2) Work Test (kg/cm2)

(Minimum amount of cement = 150 kg/m3) A

B

C

D (High

aluminia cement)

1:4:8

1:2:4

1:1½:3

1:2:4

280 (4000 psi)

350 (5000 psi)

420 (6000 psi)

210 (3000 psi)

265 (3750 psi)

350 (5000 psi)

e) Preliminary Test Cubes For each grade of concrete, 3 sets of 3 cubes shall be made.

These shall be tested at age 28 days. Specimens shall be made cured and tested according to BS 9110:1985 and BS 1881:1970. Before beginning the works, the Contractor shall submit to the Engineer for approval full details of these tests together with grading analyses and mix design calculations. The Contractor shall not place any concrete on site until the Engineer has approved the mix design. If required by the Engineer, the Contractor shall demonstrate that the workability is suitable by slump testing. The workability of concrete


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established by slump testing shall vary in the range of + 25mm or + 1/3 of the required value, whichever is bigger and in compliance with the requirements of Items 16.6 of BS 5328:1981.

f) Specified Requirements Work cube strength tests should be made and cured according

to BS 1881 and also whenever materials or proportions are changed, to prove the quality of the concrete. A record of such tests identifying them with the part of the work executed should be kept at the works. Concrete not meeting the minimum strength requirements at 28 days shall be reworked and replaced including any reinforcements steel at the Contractor’s expense.

1.2.1.2 Concrete Formwork

a) Materials Forms shall be constructed of timber or hydrophobic plywood

unless otherwise shown or specified. Timber once in forms shall have nails withdrawn and surfaces to be in contact with concrete shall be thoroughly cleaned before being sued again. Steel forms may be used provided every care is taken to ensure that the strength and finished appearance of the works is not diminished by the effect of heat on the forms. Form of ties shall be approved by the Engineer prior to use. Tying devices shall be :

o black annealed mild steel wire of 16 gauge, or o rustproofing blinding wire approved by the Engineer, or o proprietary ties approved by the Engineer

b) Design Formwork shall be so designed and constructed that concrete

may be properly placed and thoroughly compacted. Formwork shall be firmly supported and adequately strutted, braced or tied. It shall be capable of adjustment to the lines and dimensions of the finished concrete and it shall be sufficiently strong to resist without distortions the pressure of concrete during its placing and compaction and other loadings to which it may be subjected. It shall not be liable to suffer distortions under the influence of the weather.


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Obligatory, the Contractor shall coordinate formwork design with architectural and installation drawings for openings, anchors and other details.

When concrete is to be vibrated, special care shall be taken to

ensure that the formwork remains stable and the joints tight. c) Deflection The Contractor shall make allowance for any settlement or

deflection of formwork that is likely to arise during construction, so that the hardened concrete conforms accurately to the specified line and level. The Contractor shall also make allowance in the formwork for any camber specified by the Engineer to allow for the elastic deflection of structural members and deflection due to creeping of the concrete.

d) Supports

Formwork shall be so constructed that the formwork to the sides’ members can be removed without disturbing the soffit or its supports.

Props and supports shall be designed to allow the formwork to

be adjusted accurately to line and level and to be erected and removed in an approved sequence without injury to concrete.

Supports shall be carried to a construction which is sufficiently

strong to afford the necessary support without injury to any portion of the structure. This may mean in some cases that it be carried down to the foundations or other suitable base. Props and bracing shall be provided for the temporary support of composite construction where separately specified.

e) Joints and Edges All joints in the formwork shall be close-fitting to prevent

leakage of grout from the concrete. At construction joints, the formwork shall be tightly secured against previously cast or hardened concrete to prevent the formation from stepping in the concrete.

Formwork shall be constructed to provide straight and true

angles, arises or edges where shown on the drawings, corners with chamfer; the fillets shall be accurately cut to size to provide a smooth and continuous chamfer.


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Formwork panels shall have two edges to permit accurate

alignment at sides and provide a clean line at construction joints in the concrete.

f) Sundries Formwork shall be provided to the top surface of the concrete

where the slope or the nature of the work requires it. Provisions shall be made for forming holes and chases for

services and for building in pipes, conduits and other fittings, shown on the drawings.

The material and position of any ties passing through the

concrete shall be subject to the Engineer’s approval. Except where corrosion of a metal tie is unimportant, it shall be possible to remove the tie so that no part of it which has remained embedded in the concrete shall be nearer to the finished surface of the concrete than the specified thickness of the cover to the reinforcements. Any holes left after the removal of the ties shall be filled with concrete or mortar of approved composition.

g) Cleaning and Treatment of Formwork

Spaces to be occupied by concrete shall be free of rubbish, chipping, shaving, sawdust, tying wire etc. before concrete is placed. The formwork to be in contact with the concrete shall be cleaned and treated with a suitable mould oil or other approved material. Care shall be taken that oil or composition is kept from contact with the reinforcement or with the concrete at any construction joints.

h) Striking and Removal of Formwork All formwork shall be removed without shock or vibration that

might damage the concrete. Before the soffit and props are removed, the surface of the concrete shall be exposed where necessary in order to ensure that the concrete has hardened sufficiently.

The formwork to vertical surfaces such as walls, columns and

sides of beams may be removed after 12-24 hours in normal weather conditions, although care must be taken to avoid damage to the concrete, especially to arises and features. In cold weather, a longer period may be required before striking.


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The following times (in days) shall elapse before removal of formwork :

o sides of beams, walls, columns 1 o soffit of slabs 9 o Soffit of beams 9 o removal of props to slabs 14 o removal props to beams 21

The removal of formwork may be done of shorter times than those stated in the table above if the concrete test cubes are found to possess 70% of the envisaged cube strength at formwork removal day.

1.2.1.3 Workmanship

a) Batching A weighing unit shall be provided to indicate the scale load at

convenient stages of the weighing operations. b) Mixing

The concrete shall be mixed by a mechanical batch-type mixing unit provided with adequate facilities for accurate measurement and control of each material entering the mixer and for changing proportions to conform to the varying conditions of the work. The mixing unit assembly shall include adequate provisions for inspection at all times. Deviations in the water and cement content of each mixing unit shall be in conformity with items 16.4 and 16.5 of BS 5328.

c) Placing of Concrete The Engineer’s approval in writing shall be obtained before any

concrete is placed. All construction plant and materials required or which may be required during the concreting works and for curing shall be on site and fully prepared for work.

Concrete workability shall be tested and demonstrated by

means of the slump test cone. It is recommended to use concrete mix with ‘Medium’ workability in the sense of Table No.1 of BS 5328 at slump variation in the range 25 to 75 mm.

Concrete shall be compacted in its final position as soon as

practicable after mixing. Compaction shall take place within 45 minutes if the air temperature is upto 25oC, and within 30


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minutes if the air temperature is higher, all estimated from the moment of mixing the concrete. In all cases, the concrete mix shall be considered normal if it can be normally placed and carefully compacted without putting additional quantity of water.

d) Compaction of Concrete The concrete shall be thoroughly compacted by mechanical

vibration or other suitable means to produce a dense, homogenous mass. Prior to the commencement of the work, the Contractor shall demonstrate the efficiency of the method of compaction proposed on a trial section of the construction. Compaction shall not be achieved by vibration of the reinforcement.

The Contractor shall provide at least one standby vibrator

equipment during any period of concreting. e) Curing of Concrete

The concrete shall be protected from adverse weather conditions after placing. Steps shall be taken to prevent excessive rates of evaporation of water from all surfaces.

The concrete shall be protected for at least 7 days. During the

curing period, horizontal surfaces shall be protected from excessive water evaporation by covering with :

o damp sand or sawdust, burlap or similar absorbent materials

which are to be kept constantly damp, or

o an impermeable sheet, or o a membrane compound, or o other approved means

When a curing compound is applied, the Contractor shall

obligatorily prove its compatibility with the possibility of a reliable execution of the finishes over the concrete surfaces.

f) Concreting in Hot Weather

Suitable means shall be provided to ensure that the temperature of the concrete on placing does not exceed 30oC. Concreting will not be permitted when the air temperature rises above 40oC. When the air temperature in the shade exceeds 30oC, concreting will only be permitted if approved by the Engineer and after precautions have been taken to prevent early setting of the concrete.


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g) Test Work test cube strength of concrete shall be by compression

tests carried out on 15cm concrete cubes. For test purposes, one set of 3 cubes of each grade of concrete shall be sampled from each 50m3 or as stated in Item A.9 of BS 5328 or part thereof in each day’s work in accordance with the method described in Bs 1881. At the appropriate time the Contractor shall deliver them to an approved testing station where they shall be tested at age 28 and 7 according to the requirements of BS 1881. Laboratory fees for compression testing required by this Technical Specification shall be paid by the Contractor.

h) Approvals The Engineer shall approve formwork design, supporting and

bracing methods, quality of materials and supervise the placing and testing of concrete.

1.2.2 LIGHTWEIGHT FOAM CONCRETE 1.2.2.1 Materials

a) Cement: Portland cement shall be according to BS 12. b) Water: Water shall be according to BS 3148. c) Foam Agent: ‘Teepol 66’ or equivalent.

1.2.2.2 Workmanship Regarding the lightweight foam concrete production and laying, the

Contractor is allowed to use machines and equipment that shall guarantee the following physical and mechanical qualities of the lightweight foam concrete after 28 days of its being laid on the roof :

o volume weight within the limits 500 : 800 kg/m3 o cube strength from 4 to 10 kg/cm2

While laying the lightweight foam concrete in order to observe the

slopes specified in the drawings, inventory movable steel T-type profiles with the upper part 30mm wide should be used being supported by wooden blocks with different height to determine the necessary type slope. LFC is cast between two such fixed T-type profiles. Foam mass casting is being done in the direction from higher to lower points of the designed slope. LFC surface is formed by using wooden or aluminium straight board along the upper surface of the cited T-type metal profiles; during this process the redundant foam mass is being lead in the direction of the thinner part of the surface.


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This process is repeated again till whole area locked between the two metal T-type profiles serving as guides in casting the LFC liquid mass is filled. After this area has been filed, the metal T-type profile that has remained between the two margins, already filled with LFC, should be taken out and put on another margin of the roof where LFC is to be cast.

Depending on the humidity of the air within 3 to 5 hours time after

LFC has been cast regular watering of surfaces should be commenced. After 24 hours time since LFC casting all surfaces should be covered by sackcloth rugs or any other type of cloth; these covers should be kept damp all the time by the 4th day after LFC has been cast. Spraying by curing compound is completely for bidden.

All fissures having appeared as a result of LFC shrinkage should not

be filled; they should be left to serve as naturally obtained movement joints.

Because of LFC function for slopes forming on the roofs over which

polyurethane is to be sprayed, laying of any kind of cement - sand mortars and plaster on LFC surfaces is forbidden.

LFC surface sinking by 5cm altogether is admissible when the area is

3m2 in average. In case of exceeding these limits, the sunken parts are to be filled again by LFC, but not later than 3 days the initial LFC casting. It is necessary for LFC to mature at least 5 weeks so that it could be naturally dried and freed from moisture, after that the cast in-situ polyurethane could be sprayed.

1.2.2.3 Samples, Testing

Before work is started, a written statement indicating weight per cubic meter and the cube strength of the finished concrete, exact proportions, method of mixing and installing shall be submitted for approval.

1.2.3 FAIR-FACED CONCRETE SURFACES* 1.2.3.1 Formwork

Formwork for fair-faced exposed cast in-situ concrete shall be obtained by lining forms of waterproofing plywood or metal sheets, as approved. Lining shall be exactly cut to shape, well fitted, straight in planes or curves as indicated in the drawings, and its surface shall not have defects, projections or depressions liable to impair the final aspect of the concrete.

*Not included in this Contract.


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1.2.3.2 Workmanship Where cast in place, concrete is described as fair-faced and the

surface shall be smooth and even, free of all board marks, projections, pits and honey-combing etc. and all arises shall be square, straight and true.

When a curing compound is issued, its compatibility with the

possibility of lying the next finish shall be proved on the sample panel.

1.2.3.3 Samples Sample panel 200/200 cm shall be erected on the site adjacent to the

works for approval by the Engineer. The approved sample shall be left in position until the works are completed. All works in the building shall be of quality equal to that of the sample panel erected.


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1.3 STEEL 1.3.1 STEEL REINFORCEMENT 1.3.1.1 Materials

a) Hot rolled mild steel according to BS 4449-250 N/mm2, marked on part of the drawing as AI and bar index R or ø,

b) Hot rolled yielded steel (Type 2) according to BS 4449-460

N/mm2, marked on part of drawings as AIII and bar index Y, c) Hard drawn steel wire according to BS 4482-485 N/mm2.

1.3.1.2 Workmanship Bending and placing of reinforcement steel bars and wire shall

comply with BS 8110 : 1985 and BS 4466 : 1981. 1.3.1.3 Bending The detailed reinforcement drawings are showing the exact numbers,

grade, size, mark, bar centers and location of the bars. For cutting and bending purposes, the Contractor should provide separate A4 sheets as per BS 4466 : 1981. The bending dimensions should comply with the structural requirements, stated in the drawings, BS 811 : 1985 and are subject to the Engineer’s approval.

1.3.1.4 Placing and Cover Reinforcement shall be accurately placed, securely fastened and

held in the position shown or specified. Main reinforcement steel bars shall be kept a minimum of 3cm for internal sides and 4cm for external sides for beams and columns, and 2.5 cm for slabs from edges and sides of concrete in superstructure and 5cm in substructure. Dimensions of stirrups shown on the structural drawings are internal ones. A minimum lap of straight bars (excluding hooks) shall be in accordance with BS 8110 : 1985.

The fixing of reinforcement shall be checked before and during

concreting and particular attention shall be given to the position of top steel in cantilever sections.

1.3.1.5 Testing The Manufacturer’s certificate issued in accordance with the relevant

BS shall be accepted as evidence that the materials comply with that standard.


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1.3.1.6 Measurement (where applicable) Weight shall be calculated according to the bending schedules and

the standards weight of the bar sections. 1.3.2 STRUCTURAL STEEL FRAMING AND CLADDING 1.3.2.1 Structural Steel Framing

a) Materials

i) Structural Steel Shall be according to BS 5050, Part 1985 and BS 4360,

Grade 43 or similar approved grade. ii) Bolts Shall conform to BS 4190 and shall be of steel with

hexagonal heads and nuts. All permanent bolts in the structure besides concreted ones, shall be provided with nut and blocking nut, preventing unscrewing of the former.

b) Workmanship

i) General Metal surfaces shall be clean and free of mill scale, flake

and rust pitting; well formed and finished to shape and size, with sharp and angles and a smooth surface. Shearing and puncturing shall leave clean true lines and surfaces. Weld or rivet permanent connections. Welds and flush rivets shall be finished flush and smooth on surfaces that will be exposed after installation. Items that are anchored to concrete shall be securely fastened to the forms in such manner as to prevent their displacement during the placing of the concrete. Items anchored to masonry shall be adequately braced and supported while the masonry is being erected, and supports shall not be removed until masonry is fully set. All miscellaneous metal shall be installed plumb and true, accurately placed anchored in place. Stanchions shall be machined at each and to a smooth surface exactly at right angles to the longitudinal axis of the shaft to ensure close fitting of cap and base plates. Where stanchions or any other compression members are spliced the shaft ends shall be similarly machined to ensure full dead bearing across the section.


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Cap and base plates and bearing plates shall generally be

truly flat. If necessary, plate surface shall be machined to ensure true bearing, steel to steel.

ii) Alternative Steel Sections The Contractor may submit to the Engineer alternative

proposals for the use of steel shapes other than those shown on the drawings. If the use of material of such shapes is approved by the Engineer, the Contractor shall be responsible for the preparation of all necessary working details for the revised steel work and also for any other work in other trades effected by the alteration.

iii) Marking Each separate item of steel work shall have its erection

mark or marks, clearly pointed or stamped on it before application.

iv) Welding Welding in shop and field shall be done only by

experienced, well qualified welders. Equipment shall be of the type which produces proper

current, so that the welder may produce satisfactory welds. Field welding shall be done by direct current.

Electrodes shall be suitable for position and other

requirements of intended use, in accordance with standard welding practices.

The technique of welding, the appearance and quality of

welds made and the method of correcting defective work shall conform to BS 5135 : 1984.

c) Tests Mill certificates giving mechanical properties shall be supplied

for all material. The Contractor shall give the Engineer all facilities to inspect

the steel work at his works during assembly and erection. All work rejected shall be corrected or replaced as necessary.


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d) Anticorrosion Protection All parts of the steel structural elements, which are not

embedded in concrete and have exposed or concealed surfaces in contact with air, shall be carefully cleaned from any kind of dirt in a manner, approved by the Engineer, right before laying the anticorrosion coat. Particular attention shall be paid to cleaning and removal of the slag from the areas around welding seams.

The surfaces thus cleaned, shall be painted with two coats red

lead primer or zinc based primer complying to BS 2523 and BS 4652. After the second coat of red lead has dried, but not earlier than 24 hours, three successive layers of alkyd oil paint are placed with colour approved by the Engineer and clearing differing from each other.

e) Measurement Weight shall be calculated from standard sections weights.

Rates shall include corrosion protection and painting.

PRE-CAST CONCRETE 1.4.1 PRECAST CONCRETE ELEMENTS 1.4.1.1 Materials

a) Concrete

Concrete for precast concrete elements shall be Grade 30. b) Reinforcement

Reinforcement for precast work shall be high tensile, high bond steel bars according to BS 4449 or BS 4482, or as shown on the working drawings.

c) Supporting Devices

Structural supporting devices shall be structural steel according to BS 4360, Grade 43 or as shown on the working drawings.

1.4.1.2 Formwork Formwork for precast panels shall be constructed of any suitable (for

the purpose) and approved material.


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Sides of form shall ensure perfect smooth face of sides of concrete panel, free from projections, pits, honeycombs etc. and all arises shall be square, straight and true.

1.4.1.3 Casting Casting shall be performed on the site. Once the concrete has been

cast, members shall not be moved or distributed until concrete has set and the formwork can be safely removed without damage to the concrete. Units shall be form-cured at least 24 hours and kept wet at least 6 days after stripping of the forms. Form faces shall be cleaned thoroughly after each casting operation and any minor repairs required shall be made. An approved non-staining form release agent may be used to coat the forms to aid in stripping, if approved by the Engineer.

Finished units shall be straight, true to size and shape, exposed

edges shall be given minimum 6/6 mm chamfer and all flat surfaces shall be in a true plane. Wrapped, cracked, broken, spilled, stained or otherwise defective unit or units with imperfections in exposed surfaces will not be acceptable.

1.4.1.4 Erection Setting the separate panels shall be laid over the freshly poured

cement/sand solution in ratio 1:3 in order to avoid any unevenness on concrete surfaces, in compliance with the details on the working drawings.

Welding: The technique of welding, the appearance and quality of

welds made and the method of correcting defective work shall conform to BS 5135. Surfaces to be welded shall be free from loose scale, rust, grease, paint and other foreign materials, except that mill scale which withstands vigorous brushing. Joint surfaces shall be free from fins and tears.

a) Protection Supporting devices shall be protected by means of red lead

primer (two coats) and three coats of alkyd oil paint, as described in Item 1.3.2 of the present Specification.

b) Installation Precast units shall be installed perfectly plumb, level and true to

line and shall be suitably braced during erection. Care shall be


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taken during handing and installation to avoid damage to precast units.

1.4.1.5 Samples Prior to commencement of precast units production, the Contractor

shall prepare 1 sample of the most typical panel (by form, RFC and embedded parts) to represent all panels envisaged in the design. After the approval of the sample by the Engineer, the Contractor shall start with the casting of all necessary panels.

1.4.2 PRECAST CONCRETE LINTELS 1.4.2.1 Materials

a) Concrete: Concrete for precast lintels shall be Grade 30/10. b) Reinforcement: Shall be of mild steel according to BS 4449 -

250 N/mm2.

1.4.2.2 Forms Forms shall be constructed of materials that will result in units having

sharp arises, dimensional accuracy and uniformity of shape and texture.

1.4.2.3 Casting Casting shall be done on the site. Once the concrete has been cast,

members shall not be moved or disturbed until concrete has set and the formwork can be safely removed without damage.

Units shall be form-cured at least for 20 hours and kept wet for at

least 6 days after the stripping of the forms. Form faces shall be cleaned, thoroughly after each casting operation and all minor repairs required shall be made. An approved non-staining form release agent may be used to coat the forms to aid stripping, subject to approval by the Engineer.

All lintels shall have the upper surface clearly marked to ensure

correct positioning in the work. 1.4.2.4 Setting Precast concrete lintels shall be set with mortar and firmly bonded to

the masonry.

Technical Specification Part 2: Architectural works

20

Technical Specifications Part 2: Architectural works


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2.2 MASONRY - WALLS 2.2.1 CONCRETE UNITS MASONRY 2.2.1.2 Materials

a) Precast Hollow Concrete Blocks

Hollow concrete blocks shall have a length of 40cm, height 20cm and thickness as thickness of wall. Blocks shall be true to size without cracks, chips, spalls, splits or other defects, which may impair appearance, strength or durability.

The average compressive strength of hollow concrete blocks

shall be determined in the manner described in BS 2028:1968 and lowest compressive strength of any individual block tested shall not be less than the value given below (Table 2) :

o average of 10 blocks 3.5 N/mm2

o lowest individual block 2.8 mm2

Precast hollow concrete blocks shall be supplied at the project by the Contractor from Libyan National Company, manufacturer in this region, previously approved by the Resident Engineer. At the time of approval will be approved samples of that firm and with these samples shall be controlled all delivered from the approved firm lots of concrete blocks during the time of construction. If the Contractor shall arrange own production of Precast Hollow Concrete Blocks, the same shall submit for previously approved by the Resident Engineer Instructions for production, storage etc. using British Code of Practice for this kind of works.

b) Constituent Materials for Mortar

o Portland cement according to BS 12

o Sand according to BS 1200

o Hydrated lime according to BS 890

o Water according to BS 3148

c) Reinforcing Materials

o Mild steel bars 6mm dia according to BS 4449, 250 N/mm2

o Steel sections 50/50/5 mm according to BS 4360, Grade 43.


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2.2.1.3 Workmanship

a) Mortar Mortar shall consist of 5 part Portland cement, 1 part hydrated

lime and 18 parts sand. The materials for the mortar shall be so mixed that a specified proportion can be controlled and accurately maintained. All mortar mixing shall be done with mechanically operated batch mixer of drum type, except for small quantities, which may be hand mixed A sufficient amount of water shall be added as shall be consistent with satisfactory workability.

b) Reinforcement Horizontal reinforcement shall consist of 2 nos. 6mm dia M.S.

round bars with length 160mm to be placed each 4th course and anchored into slatted steel angle sections 50/50/5 m pinned to columns. Steel angles shall be with length of 5cm less than the thickness of wall, but not less than 10cm.

c) Erection All work shall be done in a first class and workmanlike manner,

protected from the elements and from damage from other work at all times.

Tooling will not be permitted. Carry up partitions tight against under side of structural floor.

Lay masonry plumb, true, line with level, accurately space course. Break each course joint with course below, keep bond plumb throughout.

Use closed end blocks where blocks form jambs of windows,

doors, returns and the like. Holes in blocks around openings for doors and windows shall

be filled with concrete.


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2.3 INSULATIONS 2.3.1 DPC UNDER CONCRETE PAVEMENTS 2.3.1.1 Materials

PVC Foil: Membrane shall consist of black or clear low density polyethylene sheet, 0.45mm thick and weighing not less than 450 gr/m2 and obtained from an approved manufacturer.

2.3.1.3 Workmanship

Rolls shall be laid over the 20cm thick hardcore bed and lapped at least 15cm at all joints. Care shall be taken to avoid puncturing and tearing during subsequent construction operations. All damaged parts shall be removed and replaced at the Contractor’s expense.

2.3.1.4 Sample

The Contractor shall submit a 30/30 cm sample of polyethylene membrane for approval before placing anywhere.

2.3.2 DPC UNDER WALLS 2.3.2.1 Materials

Bitumen Sheet: Bitumen sheet for damp proofing shall be according to Clause 4 of BS 743.

2.3.2.2 Workmanship

The laying of damp proof course shall be according to CP 102:1973. The bitumen sheet shall be laid to cover the full width of the wall on a smooth mortar bed (without protection which might cause damage to the sheeting). The joints shall be lapped at least 100mm either side and sealed with hot bitumen. In cold weather the damp proof course shall be warmed up before unrolling.

2.3.2.3 Samples

Prior to work commencement the Contractor shall prepare and submit samples to the Engineer for approval with length of 2m of DPC under walls.


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2.3.3 WATERPROOFING OF WET ROOMS* 2.3.3.1 Materials Waterproof membrane shall be soft PVC sheet with thickness 1 + 1.2

mm complying to British Standards or to DIN 16730. PVC sheet should be of a type allowing sealing by hot air. Before supplying the PVC waterproof membrane the Contractor will present to the Owner for approval samples, catalogues and certificates of the quality of the material.

2.3.3.2 Workmanship The insulation layer shall lie freely on the base. The separate sheets

shall be joined by hot air welding with 4cm overlapping. Welding shall be performed in compliance with the instructions of the manufacturer of the PVC membrane. Vertical sides of the PVC sheet next to the wall shall be performed according to the thickness of the flooring, specified on the drawings.

Prior to laying of the insulation sheet, all pipes and gullies shall be

mounted. Where the insulation foil is breached by vertical pipes, gullies and others, the insulation layer shall be doubled as per the details provided by the manufacturer.

The Contractor shall take care to avoid puncturing of the PVC

insulation foil after it has been laid and pouring of cement solution for the bed of the flooring has commenced.

2.3.4 ROOF INSULATIONS 2.3.4.1 Materials

a) Concrete Light weight concrete for slopes - sandless. Description is given

in Item 1.2.2 of the Specifications. b) Vapour Barrier Vapour barrier shall be of soft PVC sheet 0.4mm thick,

according to a sample and Certificate of Quality submitted by the Contractor and approved by the Resident Engineer.



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c) Thermal Insulation It shall be sprayed in-situ polyurethane with density of 45 to 55

kg/m3. Items (b) and (c) above are optional. d) Waterproofing Membrane

o Separation layer shall be PVC foil with thickness 0.15mm and weight 150 g/m2.

o Hydro insulation foil 1.2mm thick - a calendared, laminated

soft PVC roofing membrane, according to BS or DIN 16734 with synthetic fibre reinforcement.

o Protective felt shall be glass fibre polyester or polypropylene

non-bituminous mats with minimum thickness of 2mm and weight not less than 300 g/m2.

e) Protection Material Protection layer shall be ordinary gravel with fraction 1.5 - 3cm. f) White Cement Tiles They will have dimensions 20 x 20 x 2 cm, as indicated on the

drawings. The separate tiles shall be equal in size with perfectly right angles and without bends on the face surface. Cracked or broken tiles, or tiles with chamfered edges shall not be used. The top face surface of the tiles shall not be polished. Cube strength of the solution, used in tile manufacturing should not be less than 15 N/mm2.

2.3.4.2 Workmanship

a) Surface Preparation The base for laying roof insulation shall be completely finished

and all eventual defects removed. The Contractor shall make sure that all slopes have been executed strictly according to the design, since correction of slopes during subsequent stages of works shall be impossible. The base shall be dry and cleaned from dust, sand and construction wastes by means of compressor or brush.


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b) Vapour Barrier The insulation sheet shall be laid at places as shown on

drawings freely on the base with 5cm overlapping. The upper edges shall be from 5 to 15 cm high. After laying the vapour insulation layer, the soft and free from sand concrete for slopes shall be poured over and the Contractor shall take all measures to protect the vapour barrier from puncturing.

c) Thermal Insulation Thermal insulation shall be executed with cast in-situ

polyurethane 4cm thick. Laying shall be made in accordance with the manufacturer’s instructions.

d) Separation Layer It shall be of PVC foil with thickness 0.15mm, freely laid. The

separate sheets shall be 5cm overlapped.

e) Waterproofing Layer Hydro insulation according to BS or DIN 16734 shall be laid

freely on the base with 4cm overlapping of the sheets. Jointing of sheets shall be made by hot air welding. Prior to laying the waterproofing layer, all drains and ventilation pipes with roof outlet shall be mounted and enveloped by the hydro insulation foil, glued or welded around them.

f) Protection Felt The protection layer over the hydro insulation is envisaged to

protect the latter from being damaged by the tiles for walkways on the roof. Sheet shall be 5 to 10 cm overlapped.

g) White Cement Tiles Tiles shall be laid on dry (with minimum water content) cement :

sand solution in ratio 1 : 2 and thickness 3cm, prepared immediately before tile laying, at equal joints at both directions of the order of 1.5mm. Joints shall be filled with thin cement solution. Difference in level between the separate tiles is not admissible and the total difference in level, measured by laying a 3m long lute should not exceed 1cm. Right after tiles laying, care shall be taken to cover them with burlap or similar and to maintain constant humidity during a period of minimum 48 hours after laying.


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h) Protection Gravel Layer The gravel layer with maximum dia of grain 3.0 cm shall have a

50mm thickness. Access to ventilation units on the roof shall be done as a walkway with white cement tiles 20 x 20 cm as shown on the drawings.

2.3.5 GALVANIZED METAL FLASHING * 2.3.5.1 Materials

a) Galvanized Sheet The galvanized sheet of approved coating shall be flat with 0.6

mm thickness. b) Solder Solder shall conform to ASTM B32. Composition shall be 50%

tin and 50% lead. c) Sealant Mastic sealant shall be multi-use, approved by the R.E.

2.3.5.2 Workmanship Flashing shall be executed in compliance with the details of roof

insulation, enclosed with the drawings. 2.3.5.3 Samples The Contractor shall provide a sample of galvanized metal flashing

for approval prior to ordering. All materials shall conform to the approved sample.

2.3.6 ROOF ACCESSORIES 2.3.6.1 Materials

a) UPVC Pipes Rainwater pipes shall be of heavy duty UPVC type with dia of

100mm.



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b) Outlets

Outlets for rainwater shall be constructed in plastic and domical grating of cast silica-aluminium. Shall be similar to the product of ITALFORM or equivalent of approved quality and shall be supplied complete with all related accessories (washers, expansion rings etc.).

2.3.6.2 Workmanship

a) Outlets Outlets for rainwater shall be installed as specified by the

manufacturer, using the appropriate connection pieces. The roof drains shall be fixed in position by means of concrete mortar. Subsequently, the waterproofing membrane shall be cut using the fixing rings as templates and rings shall be tightened to block the membrane in position. Care shall be taken not to cause undue stresses in membrane during tightening.

b) Rainwater Pipes Rainwater pipes shall be fixed to the wall with clamps at 1.5m at

lest, using approved by the Engineer anchor units.

2.3.6.3 Samples The Contractor shall supply a sample of all roof accessories prior to

ordering. All materials shall conform to the approved samples. 2.3.7 EXPANSION JOINTS 2.3.7.1 Materials

a) Filler for Expansion Joints: Shall be Flexell or similar approved material.

b) Sealant Backup Material: Shall be Ethafoam (extruded

polyethylene foam rope) or similar approved material. c) Sealant: Shall be one-component multi-use and approved by

the R.E. sealant, in conformity with BS 4254/1967. d) Covering Strips: Shall be duraluminium or brass strips,

complete with fastening clips, as per the approved samples.


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2.3.7.2 Types of Joints Filling of expansion joints shall differ, depending on their localization

in the building and shall be in accordance with the details, shown on the drawings.

2.3.7.3 Workmanship

a) Joint Preparation Joints shall be thoroughly cleaned from all kinds of building

wastes, such as cement solution, plaster and formwork pieces. b) Application The polyurethane rope shall be inserted into the joint so as to

remain at a distance of 4cm from the surface. The sealant shall be gun applied, or in another manner, strictly following the manufacturer’s instructions for the application and preparation of joints surfaces. Care shall be taken to stick to the following rule : the sealant material to be laid so that its thickness should be ½ of the length of the joint under filling and to provide obligatory stopping of polyethylene rope with commercial name Ethafoam under it.

2.3.7.4 Samples The Contractor shall supply a sample of all materials for filling

expansion joints to the Engineer for approval prior to commencement of work.


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2.4 PLASTERING 2.4.1 INTERNAL CEMENT PLASTERING 2.4.1.1 Materials Constituent Materials for Plaster :

o Portland Cement according to BS 12 o Sand according to BS 1199 o Hydrated Lime according to BS 890 o Water according to BS 3148

2.4.1.2 Workmanship

a) Plaster Mix Proportion of 1st Coat: 5 parts Portland Cement, 1 part

hydrated lime, 18 parts sand. Proportion of 2nd Coat: Same as described for 1st Coat. Measure and mix materials accurately; proportion batches

exactly alike; control moisture cement in sand for each batch; machine mix materials to uniform color before adding water, then wet mix to desired consistency. Do not use any material that has set up or hardened to extent that water must be added for workability. Do not use admixture to hasten set.

b) Surface Preparation Unit Masonry Surfaces: Broom off, make free of dust, loose

mortar and the like. Wet down immediately before plaster application.

Concrete Surfaces: Clean, free of dust, loose particles,

grease, oil, foreign matter. Remove laitance, efflorescence. Before plastering dampen surfaces to receive plaster, apply dash coat of cement grout, composed of one part Portland cement and one part fine sand. Apply cement grout with stiff fibre brush; keep damp for not less than two days; allow to dry before applying plaster.


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c) Application 1st Coat: Apply with sufficient pressure, form good key. Cover

well, double back to bring plaster out to grounds, straighten to true surface with rod, darby, leave rough. On concrete ceiling slabs; spattered on with brush using whipping motion. Thickness of this coat shall be approximately 15mm.

2nd Coat: After undercoat has set film, hard, dry, scratch in

thoroughly, lay on well, double back, fill out to true, even surface, allow to draw a few minutes, trowel well to a smooth finish with water, free from cat faces and other blemishes. Make corners, angles and all intersections straight, sharp and true. Out corners shall be protected using special expanded steel sheet angle elements similar to “Expandite” - England, or another approved.

Cut finish coat accurately against frames. Thickness of this coat

shall be approximately 5mm. Workmanship shall conform with BS 5262 and BS 5492. In

case of suspended ceilings designed, no plastering on ceilings is required. Wall plastering shall be applied 10cm higher than the bottom level of suspended ceilings. Surfaces above suspended ceilings, left without plaster shall be only sprayed by machine with cement/sand mortar with thickness 3 to 5 mm.

On the walls of the already executed structure, where in future

cracks might appear, plastering between masonry walls and R.C. structure shall be interrupted. Joints shall be made by means of specially prepared pattern strip tools of galvanized sheet, timber or PVC. Width of joints to be 0.5 to 0.8 cm and depth 1.5 cm. Joints may remain unfilled or may be filled with approved by the Engineer plastic filler, similar to this produced by the companies Sika, FEB - Great Britain, or others.

2.4.1.3 Samples, Deviations The Contractor, when and where directed, will set up job sample of

specified plastering mixes and finish. When samples have been approved by the Engineer, they shall establish type, kind of mix, quality and finish of the types of plastering required. The sample for plaster shall be done on surface not smaller than 4 m2. Admissible surface unevenness, measured with 2m long lath shall be no more than 2 nos. or upto 3mm bulge. Vertical and horizontal deviation, determined with plumb - 2mm per l.m. but not more than 8mm for the entire height (or length) of wall.


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2.4.2 INTERNAL CEMENT PLASTERING ON METAL LATH 2.4.2.1 General The kind of plastering shall be executed only around rainwater pipes

and when and where indicated on the drawings. Constituent Materials for Plaster :

o Portland Cement according to BS 12 o Sand according to BS 1199 o Hydrated Lime according to BS 890 o Water according to BS 3148 o Fibre

2.4.2.2 Reinforcing Materials Metal Lath: shall be plain expanded type of 10mm mesh according

to BS 1369, or wire mesh. Hot rolled mild steel bars 6m dia, according to BS 4449-250/mm2. 2.4.2.3 Workmanship

a) Plaster Mix Proportion of 1st Coat: 1 part Portland Cement, 1 part

hydrated lime, 6 parts sand, fibre (5 kg/m3 plaster mix). Proportion of 2nd & 3rd Coats: 5 parts Portland cement, 1

part hydrated lime, 18 parts sand. Measure and mix materials accurately; proportion batches

exactly alike; control moisture cement in sand for each batch; machine mix materials to uniform color before adding water, then wet mix to desired consistency. Do not use any material that has set up or hardened to extent that water must be added for workability. Do not use admixture to hasten set.

b) Application 1st Coat: Apply with sufficient pressure to form good key.

Cover well, double back to bring plaster out to grounds, straighten to true surface with rod, darby, leave rough. Thickness approximately 10mm.


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2nd Coat: After undercoat has set film, hard, dry, scratch in thoroughly, lay on well, double back, fill out to true, even surface, allow to draw a few minutes, trowel well to a smooth finish with water, free from cat faces and other blemishes. Make corners, angles and all intersections straight, sharp and true. Cut finish coat accurately against frames. Thickness approximately 5mm.

3rd Coat: shall be the same as the 2nd coat. At openings,

where frames do not extend full depth of reveal, return, plaster on jambs and soffits. Apply plaster from base to ceiling in one operation. Avoid joints in plaster when possible. should defects develop remove and replace with perfect work. Thickness approximately 5mm.

2.4.2.4 Samples, Deviations

a) Plastering Mixes The Contractor, when and where directed, will set up job

sample of specified plastering mixes and finish. When sample has been approved by the Engineer, they shall establish type, kind of mix, quality and finish of kinds of plastering required, plumb - 2 mm per 1m, but not more than 8 mm for the entire height (or length) of wall.

b) Welding Welding and the method of correcting defective work shall

conform to BS 5135. Surfaces to be welded shall be free from loose scale, rust, grease, paint and other foreign materials, except that mill scale which withstands vigorous brushing. Joint surfaces shall be free from fins and tears.

c) Protection Supporting devices shall be protected by means of red lead

primer (two coats) and three coats of alkyd oil paint, as described in Item 1.3.2 of the present Specification.

d) Installation Precast units shall be installed perfectly plumb, level and true to

line and shall be suitably braced during erection. Care shall be taken during handing and installation to avoid damage to precast units.


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e) Samples Prior to commencement of precast units production, the

Contractor shall prepare 1 sample of the most typical panel (by form, RFC and embedded parts) to represent all panels envisaged in the design. After the approval of the sample by the Engineer, the Contractor shall start with the casting of all necessary panels.

2.4.3 PLASTER TOP SMOOTH TROWELLING (STOPPING) 2.4.3.1 Materials Gypsum or a factory prepared white finish coat (stucco), local

production of the Libyan State Works in Tripoli, marked with ‘fish’ trademark emblem or equivalent.

2.4.3.2 Workmanship All plaster surfaces receiving emulsion paint shall be smoothly

trowelled (stopped) with gypsum or with white finish coat, factorily manufactured. It is not allowed to apply a coat with thickness more than 3 mm. The layer shall be allowed to set a few minutes and trowelled to a smooth, dense, hard, polished white finish.

All such surfaces are to be smoothed with sand paper and thoroughly

cleaned prior to emulsion paint coating. 2.4.4 CEMENT SCREED ON PLINTHS * 2.4.4.1 Materials Constituent Materials for Plaster :

o Portland Cement according to BS 12 o Sand according to BS 1199 o Water according to BS 3148

2.4.4.2 Workmanship

a) Plaster Mix Undercoat Proportion: 1 part Portland Cement, 2 parts sand.

Finish Coat: 1 part Portland cement and 3 pars sand. * Not applicable for this Contract


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Measure and mix materials accurately; proportion batches exactly alike; control moisture cement in sand for each batch; machine mix materials to uniform color before adding water, then wet mix to desired consistency. Do not use any material that has set up or hardened to extent that water must be added for workability. Do not use admixture to hasten set.

b) Surface Preparation Concrete Surfaces: Shall be clean, free of dust, loose

particles, grease, oil, foreign matter. Remove laitance, efflorescence. Before plastering dampen surfaces evenly. If concrete surfaces are not rough enough to receive plaster, apply dash coat of cement grout, composed of 1 part Portland cement and 1 part fine sand. Apply cement grout with stiff fibre brush; keep damp for not less than two days; allow to dry before applying plaster.

c) Application Undercoat: Shall be dashed on with brush applying strong

whipping motion. Before undercoat has hardened, deeply cross-scratch to provide mechanically key for second coat. Thickness shall be approximately 13 mm.

Finish Coat: Shall be applied full length of wall or to natural

breaking points to eliminate joint marks. Finish texture shall be smooth. Thickness - approximately 7 mm. Cement plaster on plinths shall be executed 5cm under the sidewalk level.

Workmanship shall conform with BS 5262 and BS 5492. d) Curing To develop maximum strength, keep each coat continuously

damp for not less than 5 days. Moistening shall begin as soon as coat hardened sufficiently.

2.4.4.3 Samples, Deviations The Contractor, when and where directed, will set up job sample of

specified mixes and finish. Samples shall be not less than 4 m2.


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2.4.5 EXTERNAL CEMENT PLASTERING 2.4.5.1 Materials Constituent Materials for Plaster :

o Portland Cement according to BS 12 o Sand according to BS 1199 o Hydrated lime according to BS 890 o Water according to BS 3148

2.4.5.2 Workmanship

a) Plaster Mix Proportion of Base Coats (1st & 2nd): 5 parts Portland

Cement, 1 part hydrated lime, 18 parts sand. Proportion of 3rd Coat: 1 part Portland cement, 4 parts sand. Measure and mix materials accurately; proportion batches

exactly alike; control moisture cement in sand for each batch; machine mix materials to uniform color before adding water, then wet mix to desired consistency. Do not use any material that has set up or hardened to an extent that water must be added for workability. Do not use admixture to hasten set.

b) Surface Preparation Unit Masonry Surfaces: Broom off, make free of dust, dirt,


Concrete Surfaces: Clean, free of dirt, dust, loose particles,

grease, oil, foreign matter. Remove laitance, efflorescence. Before plastering dampen surfaces evenly. If concrete surfaces are not rough enough to receive plaster, apply dash coat of cement grout, composed of 1 part Portland cement and 1 part fine sand. Apply cement grout with stiff fibre brush; keep damp for not less than two days; allow to dry before applying plaster.

c) Scratch Coat: Applied full length of wall or to natural breaking

points such as door and window openings. Before first coat has hardened, deeply cross-scratch to provide mechanically key for second part.


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1st Coat: Shall be dashed on with brush applying strong whipping action. Thickness - approximately 10mm. If in the Engineer’s opinion surfaces are rough enough to ensure adequate bond, first coat may be applied trowel, dampen, allow to dry.

2nd Coat: Applied in the same manner as described for

scratch coat; finish to true, even surface, then roughen with wood float to provide bond for finish coat. Before application of finish coat, cure second coat by dampening; allow to dry. Thickness approximately 5 mm.

Finish Coat: Where practicable, applied from top to bottom in

one operation to eliminate joint marks. Finish texture shall be smooth. Thickness approximately 5mm.

Workmanship shall conform to BS 5626 and BS 5492. d) Curing To develop maximum strength, keep each coat, including finish

coat, continuously damp for not less than 5 days. Moistening shall begin as soon as coat hardened sufficiently.

e) Samples, Deviations: The Contractor, when and where directed, will set up job

sample of specified mixes and finish. When samples have been approved by the Engineer, they shall establish type, kind, mix, quality and finish of kinds of plastering required. Admissible surface unevenness, measured with 2m long lath - no more than 2 nos. or upto 3mm bulge. Vertical and horizontal deviation, determined with plumb - 2mm per 1m2.

2.4.6 EXTERNAL ‘TYROLEAN’ PLASTERING (TARTASHA) 2.4.6.1 Materials Constituent Materials for Plaster :

o Portland Cement according to BS 12 o White Portland Cement according to BS 12 o Sand according to BS 1199 o Crushed aggregate from limestone or marble upto 5mm according to BS 1199. o Hydrated lime according to BS 890 o Water according to BS 3148 o Admixtures according to BS 4887 o Pigments according to BS 1014


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2.4.6.2 Workmanship: Shall comply with the requirements of BS 5262.

a) Plaster Mix Proportion of Base Coats (1st & 2nd): 5 parts Portland

Cement, 1 part hydrated lime, 18 parts sand. Proportion of 3rd Coat: 1 part Portland cement, 3 parts sand

(crushed aggregate from limestone or marble upto 5mm). Measure and mix materials accurately; proportion batches

exactly alike; control moisture cement in sand for each batch; machine mix materials to uniform color before adding water, then wet mix to desired consistency. Do not use any material that has set up or hardened to an extent that water must be added for workability. Do not use admixture to hasten set.

b) Surface Preparation Unit Masonry Surfaces: Broom off, make free of dust, dirt,


Concrete Surfaces: Clean, free of dirt, dust, loose particles,

grease, oil, foreign matter. Remove laitance, efflorescence. Before plastering dampen surfaces evenly. If concrete surfaces are not rough enough to receive plaster, apply dash coat of cement grout, composed of 1 part Portland cement and 1 part fine sand. Apply cement grout with stiff fibre brush; keep damp for not less than two days; allow to dry before applying plaster.

c) Application Scratch Coat: Applied full length of wall or to natural breaking

points such as door and window openings. Before first coat has hardened, deeply cross-scratch to provide mechanically key for second part.

1st Coat: Shall be dashed on with brush applying strong

whipping action. Thickness - approximately 10mm. If in the Engineer’s opinion surfaces are rough enough to ensure adequate bond, first coat may be applied trowel, dampen, allow to dry.


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2nd Coat: Applied in the same manner as described for scratch coat; finish to true, even surface, then roughen with wood float to provide bond for finish coat. Before application of finish coat, cure second coat by dampening; allow to dry. Thickness approximately 5 mm.

Tyrolean Finish Coat: Shall be mechanically applied to give

an even textured finish as per approved sample. Thickness - approximately 5mm.

Workmanship shall conform to BS 5626 and BS 5492. d) Curing To develop maximum strength, keep each coat, including finish

coat, continuously damp for not less than 5 days. Moistening shall begin as soon as coat hardened sufficiently.

e) Samples, Deviations: The Contractor, when and where directed, will set up job

sample of specified mixes and finish. When samples have been approved by the Engineer, they shall establish type, kind, mix, quality and finish of kinds of plastering required. Admissible surface unevenness, measured with 2m long lath - no more than 2 nos. or upto 3mm bulge. Vertical and horizontal deviation, determined with plumb - 2mm per 1m2.


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2.5 FINISHES 2.5.1 CERAMIC TILES FLOORING FOR LABORATORY ROOMS AND SIMILAR PREMISES* 2.5.1.1 Materials

a) The ceramic tiles should fully comply with the technical requirements shown in the Table :

TECHNICAL CHARACTERISTICS CONFORMITY TO STANDARDS

Dimensions of the Sides + 0.4% EN 98 Thickness + 5% EN 98 Squareness + 0.5% EN 98 Straightness + 0.5% EN 98 Flatness + 0.5% EN 98 Surface Quality According to EN 98 Specific Weight 2.6 gr/cm3 DIN 1065Water Absorption +0.00 - 0.05% EN 99 Modules of Rupture (kg/cm2) 500 - 600 EN 100 Scratch Hardness of Surface (Mohs Scale) 8 EN 101 Deep Abrasion Resistance (mm) 125 EN 102 Coefficient of Linear Thermal Expansion from 20o to 100oC

-6 4.7 x 10 x C

-1 EN 103

Thermal Shock Resistance According to EN 104 Chemical Resistance to Acids and Alkalis According to EN 106

The floor tiles should be with greater slip-resistant surface with

abrasive granules, lines or figures. The tiles, depending on the type of the rooms, where they shall

be installed, could be with dimensions 10 x 20 cm or as directed by the Engineer.

The skirtings should be of the same materials, as the tiles with

dimensions 10 x 20 cm. *Not included in this Contract.


41

The Contractor shall submit samples and technical certificates covering the above technical requirements, as the Resident Engineer shall approve, according to these samples and certificates :

o Dimensions of the tiles

o Colour of the tiles

o Technical qualities of the tiles according to the certificate b) Materials Required for Setting Bed

o Portland Cement according to BS 12


o Hydrated lime according to BS 3148 c) Materials Required for Grouting

o Non-staining Cement (white cement)

o Oxide powder paint same in colour with tiles

o Water according to BS 3148 d) Bituminous felt for separating layer according to BS 747:1977,

Part 2, Class 1, type 1B - fine granule surfaced bitumen 14 kg per 10 m2.

2.5.1.2 Workmanship As indicated on Table 3 from the British ‘Code of Practice for Tile

Flooring and Slab Flooring’ - CP 202:1972, this kind of work shall be executed in compliance with Item 4.2.3, Page 14 (Bedding in Cement : Sand Mortar over a Separating Layer).

The concrete base should first be swept clean. The bedding mix shall

be designed as follows : The cement : sand mix should be stronger than 1 part Portland

cement to 3 parts clean sharp sand by volume not weaker than 1 part Portland cement to 4 parts clean sharp sand by volume.

The bedding mix should be of a stiff plastic consistency and should

contain the appropriate quantity of water so that when tamped and fully compacted into place free water does not bleed to the surface.


42

To obtain good adhesion between the bedding and tiles the bedding mix should be lightly dusted with dry cement sprinkled from a flour sieve and lightly trowelled level until the cement becomes damp. Alternatively, a slurry of neat cement/water or a cement based adhesive should be applied to the backs of the tiles. Any of these applications should be made immediately preceding the bedding of the tiles. Tiles which have, where necessary, been previously dipped in clean water and from which the surface water has been drained should then be laid on the mortar with 1.0 - 1.5 mm joint between each tile and then tamped level.

The bedding mix for this system is laid over a separating layer of

bituminous felt. The separating layer should be laid over a smooth surface, preferably a screed, with 100 mm lapped joints. Once the separating layer is in position the bedding mix should be spread over I, between wooden fillets, to provide an approximate depth when leveled. The thickness of the bedding mix should be 20 + mm. The bed should be leveled with a draw float drawn across the containing fillets, and only sufficient bedding mortar used for about 2 - 3 hours work.

Grouting of the joints may be carried out at any time to suit the

convenience of the work but should preferably be left for at least 12 hours.

The essential thing is to allow sufficient time to elapse to ensure

adequate setting to preclude disturbance of the finish during the grouting operation. However, it is not advisable to delay the grouting unduly as to open joints may collect general building dust and deleterious material.

The grouting mix should be a paste-like mixture of white cement and

pure water, to which a powdered oxide colouring agent shall be added. Too wet mix to be avoided as it may result cracking in the joint filling on drying out. This grout should be worked well into all joints until they are completely filled flush with the face of the tiles.

Surplus grout should be removed from the floor surface; on no

account should sawdust be used for this purpose, as there is a danger that sawdust entering moist joint surfaces may break down their strength, and cause them to become porous.

Skirtings shall be executed in the same manner, but the setting bed

shall consist of one coat only as specified for the second coat, but with thickness approximately 1 cm. Back side of the tiles shall be leveled with wall plastering.


43

2.5.1.3 Cleaning Upon completion, all surfaces shall be thoroughly cleaned with care

taken not to affect or damage in any way tile surface. Any damage shall be repaired to the satisfaction of the Engineer.

2.5.1.4 Protection Walls shall be protected and floors shall be covered with building

paper before foot traffic is permitted over the finished tile floors. Board walkways shall be laid on floors that are to be used continuously as passageways by workmen.

Damaged, or defective tiles shall be replaced on the Contractor’s

expense. 2.5.1.5 Samples, Deviations The Contractor shall submit to the Engineer for approval duplicate

samples of each kind of ceramic tiles and the finishing work shall conform in colour and quality with the approved samples.


44

2.5.2 CERAMIC TILES FOR WC AND BATHROOMS 2.5.2.1 Materials



Dimensions of the Sides + 0.4% EN 98 Thickness + 5% EN 98 Squareness + 0.5% EN 98 Straightness + 0.5% EN 98 Flatness + 0.5% EN 98 Surface Quality According to EN 98 Specific Weight 2.6 gr/cm3 DIN 1065Water Absorption +0.00 - 0.05% EN 99 Modules of Rupture (kg/cm2) 500 - 600 EN 100 Scratch Hardness of Surface (Mohs Scale) 8 EN 101 Deep Abrasion Resistance (mm) 125 EN 102 Coefficient of Linear Thermal Expansion from 20o to 100oC

-6 4.7 x 10 x C

-1 EN 103

Thermal Shock Resistance According to EN 104 Chemical Resistance to Acids and Alkalis According to EN 106

The floor tiles should be with greater slip-resistant surface with

abrasive granules. The tiles, depending on the type of the rooms, where they shall

be installed, could be with dimensions 10 x 20 cm or as directed by the Engineer.

The skirtings should be of the same materials, as the tiles with

dimensions 10 x 20 cm. The Contractor shall submit samples and technical certificates

covering the above technical requirements, as the Resident Engineer shall approve, according to these samples and certificates :

o Dimensions of the tiles o Colours of the tiles o Technical qualities of the tiles according to the certificate


45

b) Materials Required for Setting Bed


c) Materials Required for Grouting

o Non-staining Cement (white cement) o Oxide powder paint same in colour with tiles o Water according to BS 3148

d) Waterproofing Membrane Soft PVC according to DIN 16730,

see this Volume, Item 2.3.1, Part 2.3 - Insulations.








To obtain good adhesion between the bedding and tiles the bedding

mix should be lightly dusted with dry cement sprinkled from a flour sieve and lightly trowelled level until the cement becomes damp. Alternatively, a slurry of neat cement/water or a cement based adhesive should be applied to the backs of the tiles. Any of these applications should be made immediately preceding the bedding of the tiles. Tiles which have, where necessary, been previously dipped in clean water and from which the surface water has been drained should then be laid on the mortar with 1.0 - 1.5 mm joint between each tile and then tamped level.


46

In this case the separating layer is adequate to the preliminary laid waterproofing membrane PVC sheet, see this Volume of Technical Specifications, Item 2.3.1, Part 2.3 - Insulations). Once the waterproofing layer is in position the bedding mix should be spread over it, between wooden fillets, to provide an approximate depth when leveled. The thickness of the bedding should be 20 +5 mm.

The bed should be leveled with a draw float drawn across the

containing fillets, and only sufficient bedding mortar used for about 2 to 3 hours work.


convenience of the work but should preferably be left for at least 12 hours. The essential thing is to allow sufficient time to elapse to ensure adequate setting to preclude disturbance of the finish during the grouting operation. However, it is not advisable to delay the grouting unduly as to open joints may collect general building dust and deleterious material.


pure water, to which a powdered oxide colouring agent shall be added; mind that too wet a mix may result in the joint filling cracking on drying out. This grout should be worked well into all joints until they are completely filled flush with the face of the tiles.

Surplus grout should be removed from the floor surface; on no

account should sawdust be used for this purpose, as there is a danger that sawdust entering moist joint surfaces may break down their strength, and cause them to become porous.

Skirtings are laid in the same manner, but the 1 cm thick single-layer

under coat has constituent parts same as those of the above specified mortar for setting bed. Back surface of the skirtings shall be flush with wall plaster, or as directed by the Resident Engineer.

2.5.2.3 Cleaning Upon completion, all tile surfaces shall be thoroughly cleaned with

care taken not to affect or damage in any way. Any damage shall be removed to the satisfaction of the Engineer.

2.5.2.4 Protection Suitable protection shall be provided over ceramic floor tiles to

prevent possible tile damage during execution of works. In case the required transportation of materials by hand-push load carts, latter shall be equipped with rubber wheels and rubber shoes. Damaged or defective tiles shall be replaced on the Contractor’s expense.


47

2.5.2.5 Samples The Contractor shall submit to the Engineer for approval samples of

each type of ceramic floor tiles, prior to placing an order. All works required shall conform with the approved samples.

2.5.3 TERRAZZO TILES FLOORING 2.5.3.1 Materials

a) Terrazzo Tiles Terrazzo tiles should comply with the requirements of BS 4131.

These have a wear layer after grinding of at least 6 mm composed of graded marble chippings in Portland, white or tinted cement, on base layer of fine concrete. They are machine ground after manufacture to expose the marble aggregate, and subsequently grouted.

The Contractor shall submit to the Engineer for approval

samples of terrazzo tiles of the recommended colour and size. Marble skirtings shall be grey, uniform in colour and texture and

free from stains, discolourations, fissures and other defects. Skirtings shall be 10 cm high and 1 cm thick. All skirtings shall be factory polished.

b) Bituminous Felt

Bituminous felt for separating layer according to BS 747:1977, Part 2, Class 1, type 1B - fine granule surfaced bitumen 14 kg per 10 m2.



o Non-staining Portland Cement (white cement) o Water according to BS 3148


48

2.5.3.2 Workmanship The execution of this kind of work will be in compliance with Item

4.2.3 from the British Code of Practice 202 : 1972, i.e. (Bedding in Cement - Sand Mortar Over a Separating Layer). The concrete base should first be swept clean. The bedding mix shall be designed as follows :

The cement : sand mix should be stronger than 1 part Portland

cement to 3 parts clean sharp sand by volume not weaker than 1 part Portland cement to 4 parts clean sharp sand by volume. The bedding mix should be of a stiff plastic consistency and should contain the appropriate quantity of water so that when tamped and fully compacted into place free water does not bleed to the surface.


mix should be lightly dusted with dry cement sprinkled from a flour sieve and lightly trowelled level until the cement becomes damp. Alternatively, a slurry of neat cement/water or a cement based adhesive should be applied to the backs of the tiles. Any of these applications should be made immediately preceding the bedding of the tiles. Tiles which have, where necessary, been previously dipped in clean water and from which the surface water has been drained should then be laid on the mortar with minimal joints between each tile and then tamped level.


bituminous felt. The separating layer should be laid over a smooth surface, preferably a screed, with 100 mm lapped joints. Once the separating layer is in position the bedding mix should be spread over it, between wooden fillets, and only sufficient bedding mortar used for about 2 or 3 hours work.


convenience of the work but should preferably be left for at least 12 hours. The essential thing is to allow sufficient time to elapse to ensure adequate setting to preclude disturbance of the finish during the grouting operation. However, it is not advisable to delay the grouting unduly as to open joints may collect general building dust and deleterious material.


pure water. Too wet mix to be avoided as it may result cracking in the joint filling on drying out. This grout should be worked well into all joints until they are completely filled flush with the face of the tiles.


49

Surplus grout should be removed from the floor surface; on no account should sawdust be used for this purpose, as there is a danger that sawdust entering moist joint surfaces may break down their strength, and cause them to become porous.

Skirtings shall be laid in the same way as the terrazzo tiles are, but no undercoat shall be used. Back surface of skirtings shall be flush with wall plaster. Joints shall be filled in with creamy like white cement, filling all voids. When joint fill is completely dried, face edges shall be carefully polished to avoid all possible surface roughness.

2.5.3.3 Protection Suitable protection shall be provided over ceramic floor tiles to

prevent possible tile damage during execution of works. In case the required transportation of materials by hand-push load carts, the latter shall be equipped with rubber wheels and rubber shoes. Damaged, or defective tiles shall be replaced on the Contractor’s expense.

2.5.3.4 Samples The Contractor shall submit to the Engineer for approval samples of

each type of ceramic floor tiles, prior to placing an order. All works required shall conform with the approved samples.

2.5.4 MARBLE TILES FLOORING 2.5.4.1 Materials

a) Marble Slabs Marble tiles shall be with dimensions according to the detailed

architectural drawings, as per the approval of the Engineer. The marble slabs shall be with exact dimensions, clean surfaces and without cracks or any other defects.

Marble skirtings shall have 10 cm height, thickness 1 cm and

length variable from 40 upto 120 cm. The quality of the skirting should be similar as of the marble slabs. The colour shall be as above.

All marble slabs and skirtings shall be shop polished.


50

Prior to the material delivery the Contractor shall submit to the Resident Engineer samples with the required dimensions and colours for approval by the Resident Engineer.

b) Constituent Materials for Setting Bed

o Portland Cement according to BS 12

o Lime according to BS 890


o Water according to BS 3148 c) Constituent Materials for Grouting


2.5.4.2 Workmanship The execution of this kind of work shall be according to the British

Code of Practice for Tile Flooring and Slab Flooring - CP 202 : 1972. Bedding system for natural stone flooring of marble. The marble

slabs are solidly bedded on cement : lime mortar consisting of 1 part cement to 1 part lime to 3 parts clean washed sand. Care should be taken in the selection of the sand when laying white or light coloured marbles if subsequent is to be avoided.

Jointing of marble with smooth finishes. The most satisfactory

results are obtained when these materials are laid with narrow joints of 1.0 - 1.5 mm. These should be filled with neat cement grout which is spread over the floor and worked into the joints. Surplus grout should be cleaned off.

Skirting shall be executed in the same manner, as floor slabs, their back side shall be leveled with plaster surface. Damaged, or defective tiles shall be replaced on the Contractor’s expense.

2.5.4.3 Protection Marble floors shall be covered with building paper, or gypsum

solution layer before foot traffic is permitted on the finished marble floor. Board walkways shall be made in passageways for workmen.


51

2.5.5 MARBLE FOR STAIRS 2.5.5.1 Materials

a) Marble Slabs Marble tiles for stairs shall be with dimensions in accordance

with the drawings, as follows :

o Tiles for treads 3 cm thick, length and width according to architectural details in drawings.

o Risers for treads 2 cm thick, height according to architectural

details, length 60 to 120 cm, also according to details.

o Skirtings 2 cm thick, height and length according to details. All marble slabs and skirtings shall be shop polished. Prior to supply the marbles the Contractor shall submit samples

with dimensions 30 x 30 cm to the Engineer for approval of colour and quality.

b) Constituent Materials for Setting Bed

o Portland Cement according to BS 12 o Lime according to BS 890 o Sand according to BS 1199 o Water according to BS 3148

c) Constituent Materials for Grouting


2.5.5.2 Workmanship The execution of this kind of work shall be in accordance with British

Code of Practice for Tile Flooring and Slab Flooring - CP 202 : 1972. Bedding system and fixing copper clips of the tiles shall be according

to Items 4.2.11, 4.2.11.1, Page 16 & 17 from the cited CP-202:1972.


52

Jointing of marble with smooth finishes. The most satisfactory results are obtained when these materials are laid with narrow joints of 1.0 - 1.5 mm. These should be filled with neat cement grout which is spread over the floor and worked into the joints.

Treads should be solidly bedded using the respective mortar as for the flooring. Risers selected from any natural material should be fixed by means of copper clamps and the solid back filling reduced in strength to provide a cushion effect against damaging blows. Where the protective coating is broken to provide holes for the cramps, the coating should be made good before the slabs are fixed. Damaged or defective slabs shall be replaced at the Contactor’s expense.

2.5.5.3 Protection The treads shall be covered with building paper before foot traffic is

permitted on the staircase and risers shall be embraced with timber. 2.5.6 MARBLE FLOOR THRESHOLDS 2.5.6.1 a) Materials for Thresholds

Marble floor thresholds shall be with dimensions: 2 cm thickness, width of type A-19 cm, type B - 24 cm and length for both 62, 72, 82 and 92 cm according to the drawings. The colour of marbles shall be in accordance with the General Design for finishing works approved by the Engineer. Marble floor sills shall be with exact dimensions, clean surfaces, no cracks and any other defects.

Prior to supply the marbles the Contractor shall present to the

Engineer for approval submit samples with dimensions 30 x 30 cm, for Engineer for approval of colour and quality too.

b) Materials for Bedding

o Cement according to BS 12 o Lime according to BS 890 o Sand according to BS 1199 o Water according to BS 3148

c) Materials for Grouting



53

2.5.6.2 Workmanship The execution shall be according to the British Code of Practice for

Tile Flooring and Slab Flooring - CP 202 : 1972. Bedding system in compliance with Items 4.2.11, 4.2.11.1, Page 16

of the cited CP - 202 : 1972. The materials are solidly bedded on cement : lime mortar consisting

of 1 part cement to 1 part lime to 3 parts clean washed sand. Care should be taken in the selection of the sand when laying white or light coloured marbles if subsequent staining is to be avoided. Damaged or defective slabs shall be replaced at the Contactor’s expense.

2.5.6.3 Protection The thresholds shall be covered with building paper before foot traffic

is permitted. 2.5.7 MARBLE WINDOW SILLS 2.5.7.1 Materials

a) Marble Window Sills Marble window sills shall be with dimensions according to the

widths of the relevant window shown in the drawings. The length of tiles for tiling the window sills could be variable from 60 to 120 cm in the total length of the window. The thickness o the tiles should be of 2 cm. The tiles shall be with clean surface without pores and cracks, and any kind of other defects.

Prior to supply the marble for tiling of the window sills the

Contractor shall present samples with dimensions 30 x 30 cm to the Engineer for approval. Quality and of colour as per General Design for colours of the Project as approved by the Engineer.

b) Materials for Bedding

o Cement according to BS 12

o Lime according to BS 890




54

c) Materials for Grouting

o Non-staining Portland Cement (white cement)


2.5.7.2 Workmanship The execution of this kind of works shall be according to the British

Code of Practice for Tile Flooring and Slab Flooring - CP 202 : 1972. Bedding system and fixing with copper cramps of the particular tiles

is as per Items 4.2.11, 4.2.11.1 and 4.4, Page 16 & 17 from the cited CP - 202 : 1972.

The materials are solidly bedded on cement : lime mortar consisting

of 1 part cement to 1 part lime to 3 parts clean washed sand. Care should be taken in the selection of the sand when laying white or light coloured marbles if subsequent staining is to be avoided.

Jointing of marble with smooth finishes. The most satisfactory results are obtained when these materials are laid with minimal joints. These should be filled with neat cement grout which is spread over the sills and worked into the joints.

Sills should be solidly bedded using the respective mortar and shall be fixed by means of copper cramps. Where the protective coating is broken to provide holes for the cramps, the coating should be made good before the slabs are fixed. Damaged or defective slabs shall be replaced at the Contactor’s expense.

2.5.7.3 Protection The sills shall be covered with building paper, or PVC foil.


55

2.5.8 ACID-RESISTANT TILE FLOORING* 2.5.8.1 Materials



Dimensions of the Sides + 0.4% EN 98 Thickness + 5% EN 98 Squareness + 0.5% EN 98 Straightness + 0.5% EN 98 Flatness + 0.5% EN 98 Specific Weight 2.6 gr/cm3 DIN 1065Bulk Density 2.3 gr/cm3 DIN 1065Water Absorption +0.00 - 0.05% EN 99 Breaking Strength 400÷460kg/cm3 EN 100 Scratch Resistance (Mohs Scale) 5 ÷ 7 EN 101 Linear Thermal Expansion 20o to 100 oC - 6

7.2 x 10 x oC - 1

EN 103 Thermal Shock Resistance Resists EN 104 Glaze Resistance to CV-rays (Light Stability) According to DIN 51094 Resistance to Staining According to EN 122 Resistance to Acids and Alkalis with the exception of Hydrofluoric Acid and its compounds

According to EN 122

Frost Resistance Resists EN 202

The cited technical characteristics cover all the technical

requirements of BS 1281 : 1974 ‘Glazed Ceramic Wall Tiling’. The floor tiles should be with greater slip-resistant surface with abrasive granules.

The tiles, depending on the type of the rooms, where they shall

be installed, could be with dimensions 20 x 20 cm. The skirtings should be of the same materials as the tiles, but

with dimensions 10 x 20 cm. *Not included in this Contract.


56

The Contractor shall submit samples and technical certificates

covering the above technical requirements, as the Resident Engineer shall approve, according to these samples and certificates :

o Dimensions of the tiles o Colour of the tiles o Technical qualities of the tiles according to the certificate

b) Materials Required for Setting Bed

o Cement according to Table 1 from CP 202 : 1972 o Sand according to BS 1199 o Water according to BS 3148


o Cement according to Table 1 from CP 202 : 1972 o Oxide powder paint same in colour with tiles o Water according to BS 3148

d) Bituminous felt for separating layer according to BS 747:1977,

Part 2, Class 1, Type 1B - fine granule surfaced bitumen 14 kg per 10 m2.









mix should be lightly dusted with dry cement sprinkled from a flour sieve and lightly trowelled level until the cement becomes damp.


57

Alternatively, a slurry of neat cement/water or a cement based adhesive should be applied to the backs of the tiles. Any of these applications should be made immediately preceding the bedding of the tiles. Tiles which have, where necessary, been previously dipped in clean water and from which the surface water has been drained should then be laid on the mortar with 1.0 - 1.5 mm joint between each tile and then tamped level.


bituminous felt. The separating layer should be laid over a sooth surface, preferably a screed, with 100 mm lapped joints. Once this separating layer is in position the bedding mix should be spread over it, between wooden fillets, to provide an approximate depth when leveled. The thickness of the bedding should be 20 +5 mm.

The bed should be leveled with a draw float drawn across the

containing fillets, and only sufficient bedding mortar used for about 2 to 3 hours work. Grouting of joints may be carried out at any time to suit convenience of the work but should preferably be left for at least 12 hours.

The essential thing is to allow sufficient time to elapse to ensure

adequate setting to preclude disturbance of the finish during the grouting operation. However, it is not advisable to delay the grouting unduly as to open joints may collect general building dust and deleterious material.


pure water, to which a powdered oxide colouring agent shall be added. Too wet to be avoided as it may result cracking in the joint filling on drying out. This grout should be worked well into all joints until they are completely filled flush with the face of the tiles. Surplus grout should be removed from the floor surface; on no account should sawdust be used for this purpose, as there is a danger that sawdust entering moist joint surfaces may break down their strength, and cause them to become porous.

Skirtings shall be executed in the same manner, but the setting bed

shall consist of one coat only and as specified for the second coat, but with thickness approximately 1 cm. Back side of the tiles shall be leveled with wall plastering.

2.5.8.3 Cleaning Upon completion, all tile surfaces shall be thoroughly cleaned with



58

2.5.8.4 Protection Walls shall be protected and floors shall be covered with building

paper before foot traffic is permitted over the finished tile floors. Board walkways shall be laid on floors that are to be used continuously as passageways by workmen. Damaged, or defective tiles shall be replaced on the Contractor’s expense.

2.5.8.5 Samples, Deviations The Contractor shall submit to the Engineer for approval duplicate

samples of each kind of ceramic floor tiles and the finishing work shall conform in colour and quality with the approved samples.

2.5.9 GLAZED CERAMIC WALL TILING 2.5.9.1 Materials

a) The ceramic tiles with dimensions 15 x 15 cm shall fully comply with the technical requirements of the Table below :


Dimensions of the Sides + 0.4% EN 98 Thickness + 5% EN 98 Squareness + 0.3% EN 98 Straightness + 0.3% EN 98 Flatness + 0.4% EN 98 Specific Weight 2.6 gr/cm3 DIN 1065Bulk Density 2.0 gr/cm3 DIN 1065Water Absorption 10 ÷ 14% EN 99 Breaking Strength 280÷350kg/cm3 EN 101 Scratch Resistance (Mohs Scale) 5 ÷ 7 EN 101

Linear Thermal Expansion 20o to 100 oC - 6

7.2 x 10 x oC - 1

EN 103 Thermal Shock Resistance Resists EN 104 Glazing Resistance Resists EN 105 Glaze Resistance to UV-rays (Light Stability) According to DIN 51094 Resistance to Staining According to EN 122 Resistance to Acids and Alkalis with the exception of Hydrofluoric Acid and its compounds

According to EN 122

Frost Resistance Not-resistant EN 202

The cited technical characteristics cover all technical

requirements of BS 1281 : 1974 ‘Glazed Ceramic Wall Tiling’.


59

b) Mortar for Setting Bed Scratch Coat: Portland Cement 1 part : Sand 3 parts. Float Coat: Portland Cement 1 part, hydrated lime a ½ part, sand 4 parts.

2.5.9.2 Application

Scratch Coat shall be mixed with the minimum amount of water necessary to form a workable mixture. Float Coat shall be applied with sufficient pressure to cover the area and form a good key. This coat shall be brought level with guide strips previously laid to give a true surface for setting coat. Tiles shall be laid in Portland cement and in perfect vertical and horizontal alignment. Joints shall be 1.0 mm wide. Prior to laying tiles shall be treated all in accordance with manufacturer’s instructions. Grouting of the joints may be carried out at any time to suit the convenience of the work but should preferably be left for at least 12 hours.

The essential thing is to allow sufficient time to elapse to ensure adequate setting to preclude disturbance of the finish during the grouting operation. However, it is not advisable to delay the grouting unduly as to open joints may collect general building dust and deleterious material.


pure water. Mind that too wet a mix may result in the joint filling cracking on drying out. This grout should be worked well into all joints until they are completely filled flush with the face of the tiles.

Upon completion, all tile surfaces shall be thoroughly cleaned with


2.5.9.3 Samples The Contractor shall submit to the Engineer for approval duplicate

samples of each kind of ceramic floor tiles and the finishing work shall conform in colour and quality with the approved samples.


60

2.5.9.4 Place of Laying Glazed ceramic tiles shall be laid in position, as shown on the

working drawings. When glazed ceramic tiles are shown in the area of the wash-basins, they shall be laid as specified here:

o Length : The length of the wash-basin with 2 tiles more, each side. o Height : 60 cm, starting from the top level of the washbasin.

2.5.10 INTERNAL EMULSION PAINTING 2.5.10.1 Materials

Paint: Emulsion paint shall be production of the Libyan Works, marked with ‘Fish’ trademark emblem and suitable for internal painting or equivalent. All internal paint should be washable paint.

2.5.10.2 Workmanship Surface preparation according to BS 6150. Rendered and plastered surfaces shall have all cracks and other defects cut out and filled with approved hard plaster. The filling to be level with the surrounding surfaces and allowed to dry out thoroughly.

2.5.10.3 Application Priming, thinning and painting shall be in full compliance with

manufacturer’s instructions. 2.5.10.4 Samples The Contractor shall submit, to the Engineer for approval, the

manufacturer’s recommended colours catalogue before commencement of works. No painting is allowed prior to approval of colours.

2.5.11 EXTERNAL EMULSION PAINTING 2.5.11.1 Materials

Paint: Emulsion paint shall be production of the Libyan Works in Tripoli, marked with ‘Fish’ trademark emblem and suitable for external painting or equivalent.


61

2.5.11.2 Workmanship Surface preparation according to BS 6150. Rendered and plastered surfaces shall have all cracks and other defects cut out and filled in with approved hard plaster. The filling to be level with the surrounding surfaces and allowed to dry out thoroughly.

2.5.11.3 Application Priming, thinning and painting shall be in full compliance with

manufacturer’s instructions. 2.5.11.4 Samples The Contractor shall submit, to the Engineer for approval, the

manufacturer’s recommended colours catalogue before commencement of works. No painting is allowed prior to approval of colours.

2.5.12 EXTERNAL SILICATE BASED PAINTING* 2.5.12.1 Materials

The special Silicate Paint should be of the qualities of the approved and applied in GSPLAJ already paint, manufactured by the ‘Keim Farben’ Company of West Germany or a similar one. The Contractor to submit to the Resident Engineer samples and certificates of the quality of the paint for approval.

2.5.12.2 Workmanship Surface preparation Silicate paint shall be applied on concrete surfaces, the location of which is shown on the working drawings and which are subject to direct sunshine and atmospheric effects. Dosing of colour and application shall conform to the manufacturer’s instructions.

2.5.12.3 Samples Prior to work commencement, the Contractor shall set up job sample

of concrete surfaces on the panels at least, colour and quality of the paint being approved by the Engineer.

*Not included in this Contract


62

2.5.13 SUSPENDED CEILING 2.5.13.1 Materials

o System of hangars, anchored to the RC slab, made of non-corroding metal, fit for adjustment in height in order to obtain perfect evenness of the ceiling.

o Bearing grid of metal profiles, fixed to the hangars with special for

the purpose clips or accessories, made of non-corroding metal,.

o Rectangular aluminium strips, forming the suspended ceiling finish, either preformatted by the manufacturer or not, as per the Engineer’s instructions, 10cm wide, length depending on the production of the manufacturer and the Engineer’s direction and thickness of the sheet of the order of 0.6mm. (for ground floor Toilets).

o Special ‘L’ perimeter profiles, providing the proper visual

connection between plastering and the strips of suspended ceiling.

o Square aluminum panels acoustically insulated with fiberglass in the Main Dining Hall as well as in the Guest Dining Hall.

2.5.13.2 Workmanship After completion of all kinds of works, preceding the mounting of

suspended ceilings and after the required testings, they shall be taken over by the Engineer and a protocol shall be signed, covering the following :

o Plastering on walls upto a height 10cm over the level of the

suspended ceiling :

o Rough spraying of walls with cement : sand solution in the area over the suspended ceiling upto the RC slab.

o Mounting of all pipelines, envisaged in parts water supply and

sewerage and mechanical of the design, all air ducts, electro-mechanical devices and their connections.

o Mounting of all cables, hangars and cable trays, all hangars for

lighting fixtures and other devices embedded in the suspending ceiling.


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Only then, mounting of the suspended ceiling may commence. The

manner of mounting shall be in compliance with the working drawings, prepared by the manufacturer of the suspended ceiling or by the Contractor or approved by the Engineer. The suspended ceiling shall be mounted so as its entire surface shall be free of any unevenness which may be seen. The separate panels shall also be leveled, joints between them shall be equal in both directions and the ending pieces in the areas next to the walls shall be symmetrically arranged. The special ‘L’ profiles shall be with perfectly straight horizontal lines and hardly visible weldings between them. They shall firmly stick to the panels of the room.

2.5.13.3 Samples The Contractor shall submit to the Engineer for previous approval

catalogues of the company manufacturer of suspended ceilings. After their review, the Engineer will determine the type of suspended ceilings as regards surface finish and colour, as well as the respective system of hanging, proposed by the manufacturer. The Contractor shall submit samples of all separate components of the suspended ceilings, two nos. of each one - one for the Engineer and one for his sample room. All elements of the suspended ceilings delivered at the project site shall be in full compliance with the approved samples.


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2.6 DOORS AND WINDOWS 2.6.1 * STEEL DOORS AND FRAMES WITH HOLLOW CORE SECTION 2.6.1.1 Materials

o Steel Profiles according to BS 4360, Grade 43 o Bolts according to BS 916 or BS 2708 with hexagonal heads & nuts o Steel Sheet according to BS 1149, Part 1 with thickness 0.6 to 1.5mm

The steel sheets should be of a very high quality, used in furnishing,

bilaterally thermally treated, perfectly even and free of any local defects, such as slag, corrosion, rust and other external or concealed defects.

Door frames be made of cold bent open profiles with perfectly right

angles, with straight and free of damage surfaces of sheets with thickness 1.5mm. They shall be provided with the necessary anchoring accessories, which will grant perfect mounting and reliable fixing to concrete or brick walls, as well as with the necessary number of hinges, fully corresponding in height to the door panel.

2.6.1.2 Workmanship Doors shall be made strictly in compliance with the working drawings

in a specialized workshop. All connections shall be made by electrical welding or riveting, but the connection shall be made invisible. All welding shall be perfectly smoothed with machines and the joints between the separate elements filled with suitable putty and smoothed with spatula. All external corners shall have suitable, machine treated chamfers. Dimensions shall be in full compliance with design.

The door and frame shall be provided with perfectly corresponding

devices for the relevant type of lock and latch, machine made. The door panel shall be easily removable from the frame at any time.

The frames and the doors shall be mounted absolutely vertical, without any twisting or torsion. Immediately after the vertical adjustment of the frame and its anchoring into the wall, as per the details, the whole frame shall be filled with cement-sand solution or fine concrete.

The frames and doors shall be primed with red lead and then painted

with the paint approved by the Engineer. At that, the surfaces shall be free of honeycombs, drops or streams of primer or paint.

* Not applicable for this Contract.


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2.6.1.3 Samples The Contractor shall submit a sample piece with dimensions not less

than 50/50 cm from one of the frame angles and a piece of the door in cross section, as well as samples of locks and latches, primer and paint.

2.6.2 ALUMINIUM DOORS AND WINDOWS 2.6.2.1 Materials

o Aluminium Profiles, extruded or rolled, of Al.Mg.S1 05 alloy with tensile strength not less than 22 N/mm2, anodized from 16 to 18 mic, with natural colour type ‘Naturanodic EG/EV-1’, in full compliance with the provisions of BS for such kinds of works.

o Steel Profiles according to BS 4360 - hot dip galvanized.

o Neoprene Gaskets of material containing at least 50% pure

neoprene, specially bent and not changing their hardness and elasticity in the temperature range from 0o to 60oC.

o Metallic Wire Mosquito Net with holes of the order of 1.5/1.5 to

2.0/2.0 mm, anchoring to an approved sample by the Engineer. 2.6.2.2 Workmanship Doors and windows shall be made in a manner fully satisfying the

functional requirements towards the relevant type of joinery, as well as the architectural-aesthetic criteria for a good external and internal appearance. It is obligatory to stick strictly to all design dimensions. All connections between the separate elements and profiles shall be made precise, strong, using reliable and tested in practice joints. All joints shall be absolutely tight, impervious to water and dust, the profiles to be connected shall be perfectly adjusted and permanent and weather-resistant gaskets shall be used.

As a rule, all doors and windows shall be manufactured and mounted

together with their frames, but dismantling of the wings from the frames should always be possible. Doors and windows shall be delivered complete with all their accessories - locks, latches, handles, mechanisms, stoppers etc. according to the architectural drawings and approved samples.


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The method of anchoring to the sides of the relevant openings in the walls has to be reliable and to secure the precise and accurate mounting of the corresponding element. Special care shall be taken for the perfect compacting of the joints between the plastering or other finishes and the aluminium joinery; manner and means to be approved by the Engineer.

Fitting of the separate elements, providing the smooth and soft of the

wings, their tight closing, unlocking, locking and anything else, securing the normal and uninterrupted functioning of the elements, as well as the correct adjustment of hydraulic mechanisms - all that shall be executed after the glazing and gasketing of the elements.

All elements shall be protected by suitable means and the Contractor

shall provide all necessary protection during transportation, mounting and after that till the final handing over of the project.

2.6.2.3 Samples and Shop Drawings Sample pieces with dimensions not smaller than 30 cm of all joinery

elements shall be submitted to the Engineer for approval prior to delivery. The Engineer has to approve all shop and typical drawings before commencement of the production.

2.6.3 WOODEN HOLLOW CORE FLUSH DOORS AND WINDOWS 2.6.3.1 Materials (Doors)

o Softwood and hardwood according to BS 1186, Part 1.

o Plywood according to the additional conditions of BS 1186, Part 1 with moisture resistance as per type BR of BS 1455.

o Veneering shall be Grade 1for doors whose visible surface is

hardwood veneer and Class 2 for doors with visible surface of formica.

o Laminated plastic according to BS 3794, with an approved colour

and texture of the material.

o Adhesive - it will comply with the requirements of BS 1204, universal type of synthetic glue, suitable for wood and chosen laminated covers and with qualities which do not change with time.


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2.6.3.2 Workmanship The door panel framing and the middle panel rib shall be made of

softwood. The filling shall be a squared grid of softwood. All the wooden material shall be disinfected against insects and treated with anti-decaying agents. The frame elements have to be connected by cutting grooves and pins, well glued and securing the evenness and stability of the door.

The approved door finish shall be hardwood veneer, 5 mm plywood

with the required finish shall be glued and pressed. In this case, the sides, the upper and the bottom parts of the panel shall be clad with solid hardwood, of the same kind as the visible veneer. After a careful smoothing of the surfaces with sandpaper, the doors shall be enameled as approved by the Engineer.

All doors shall be provided with machine made grooves for the

ironmongery, perfectly fitting with those on the doorframe. Door & window frames shall be made of wood, size to be as per the approved drawings by the Engineer.

All doors shall be perfectly fixed to the corresponding frames and

shall be able to open and close smoothly, softly and without efforts for jolts after their complete glazing and providing with the required hydraulic devices and stopper, wherever envisaged.

Windows shall consist of wooden louvered openable shutters fixed

externally and glass openable shutters (5 mm thick transparent glass) internally. The shutters shall be perfectly fixed to the corresponding frames with hinges and shall be able to open and close smoothly, softly and without efforts or jolts. Window frames shall be double rebated to house external and internal shutters and shall be properly fixed to walls with necessary hold fasts.

The design, materials and fittings of doors and windows shall be

subject to Owner’s approval, however, in no case the design, materials and fittings shall be inferior to the doors and windows of the existing houses in the Refinery Township.

All doors and windows shall be painted with enamel paint of

approved quality. All timber used in joinery work, whether imported, finished or worked

on site shall be of good quality, thoroughly seasoned, free from heart and cup shakes, wanes, large loose or dead knots, splits and sapwood. It is to be clean, sound, straight, grained and without warp or twist.


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2.6.3.3 Samples and Shop Drawings The Contractor shall submit a sample corner of a cut door/window

with dimensions not smaller than 50/50 cm, all elements of the skeleton and finish visible, as well as detailed typical shop drawings prior to manufacture commencement to be approved by the Engineer.

2.6.4.2 Workmanship The gasketing profiles shall be placed in the specially prepared for

the purpose grooves along the perimeter of the door leaf and shall secure 100% light protection when door is closed. The gasketing strip at the bottom part of the door shall be further fixed by means of aluminium cleat and screws for wood with flush heads.

2.6.4.3 Samples and Drawings The Contractor shall present a sample corner of the specified door

with dimensions 30/30 cm, gaskets mounted, as well as shop drawing with principal details of its manufacture.

2.6.5 IRONMONGERY 2.6.5.1 General The Contractor shall submit for approval to the Engineer catalogues

or samples of well known and specialized in ironmongery production company or companies. The materials presented for approval shall be in full compliance with the requirements towards their qualities, indicated on the working drawings.

All approved and delivered to the project site ironmongery shall be

accompanied by the relevant certificates of the manufacturer, complete with all accessories necessary for mounting. All ironmongery elements shall perfectly fit to each other and the reliability of the joints and the precise functioning of mechanisms shall be ensured. Using nails as fixing means is absolutely forbidden.

Unless otherwise specified in the shop drawings, all joinery elements

shall be aluminium cast with mat pearly finish of the surface. All mechanical mobile parts of the ironmongery have to be well

checked, carefully lubricated and adjusted, in order to secure their smooth and proper functioning.


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All latches shall be delivered complete with 3 No. keys. The keys shall be submitted to the project Owner or his representative at the time of project handing over, fixed with a key holder. The key holder shall be a non-corroding metal plate with dimensions 2 x 5 cm with clearly and permanently marked number of the door to which the keys belong.

All doors shall be provided with floor door stoppers, fixed immobile

and with rubber caps. All double acting doors shall have spring hinges, returning the door to

closed position. All double-leaf aluminium doors which open to one side only shall be provided with plates, marked with ‘Push’ or ‘Pull’ respectively.

For all the sliding doors, rubber gaskets of an approved material and

quality shall be provided. All doors shall be provided with a plate of a type approved by the

Engineer, with clearly and permanently written door number as per the design scheme.

All doors of offices, laboratories, special rooms and others, wherever

necessary, shall be provided with name holders, metal, complete with a protective piece of hard, transparent plastic, thickness of the order of 1.5 to 2 mm, type approved by the Engineer.

2.6.5.2 Workmanship Ironmongery shall be fixed to doors and windows strictly following the

architectural - medical technologic plans, by qualified workers. The Contractor shall provide means for protection and maintenance of ironmongery proper and functional till project handing over.

2.6.5.3 Samples After the approval of the company manufacturer of the ironmongery,

the Contractor shall submit one sample each kind of ironmongery, complete with fixing elements. The types of ironmongery, delivered at the project site shall be in full compliance with the samples.


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2.7 WOODEN, METAL WORKS AND MISCELLANEOUS 2.7.1 METAL FABRICATION 2.7.1.1 Materials

a) Steel

o Round Steel Bars, mild steel according to BS 44661.

o Chequered Plates, shapes, sections pipes, sheet steel according to BS 4360

b) Painting Materials

o Manufactured by the Libyan State Plants with ‘Fish’ symbol or equivalent.

c) Aluminium

o Extruded sections shall be according to DIN Standards. o Aluminium sheets shall be according to DIN Standards.

d) Wood for Combined Details

o Softwood, hardwood, plywood according to BS 1186, Part 1. o Blockboard shall be according to BS 3444. o Adhesive shall be suitable synthetic one.

2.7.1.2 Workmanship Fabrication shall be carried in thorough workmanlike manner. Metals

shall be formed true to details, they shall have clean, straight, sharp defined profiles and unless otherwise particularly noted, with smooth finished surface.

Joints shall be so assembled that they will be as strong, rigid as

adjoining sections, they shall be continuously welded, spot welded only where approved. Face joints shall be dressed, ground flush, polished smooth and to specified finish of joined materials; joints shall be close fitting, made where least conspicuous, water-tight where subject to elements.

Rivets, bolts, screw heads shall be flat, countersunk where thickness

of material will permit; oval and/or truss head on thin material only when approved in exposed work. Exposed bolts, screw ends and the like shall be cut off, dressed flush with nuts or other adjacent metal.


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Weights of connections and accessories shall be adequate to sustain safety and withstand stresses, strains to which they will be normally subjected and equivalent to strength of material and sections to be joined.

Work shall be built in with masonry. Where anchors, connections or

other details are not indicated or specified, their material, size, form and attachment shall conform to standard approved practices for materials for this type of construction.

Veneering of wooden elements of combined details shall be Grade 1

for hardwood veneer and shall be treated with clear lacquer mat finish. When indicated on the drawings, wooden elements of combined details shall be primed and painted with oil paint in two coats. Varnish and/or painting shall be as per manufacturer’s instructions.

Defective work of any kind, whether in materials or workmanship will

be rejected; the Contractor shall remove such rejected work and replace it with new, satisfactory work without extra cost to the Employer.

2.7.1.3 Samples If required by the Engineer, the Contractor shall submit samples of

fabricated metalwork to show quality of workmanship and fabrication details. No work shall commence until samples have been approved. The Contractor shall submit samples of manufactured venetian blinds to be approved, shape, colour etc.

2.7.2 ALUMINIUM PARAPET FOR STAIRCASES 2.7.2.1 Materials

o Aluminium Profiles, extruded or rolled, of Al.Mg. S105 alloy with tensile strength 22 N/mm2, anodized from 16 to 18 mic, with natural colour type ‘Naturanodic EG/EV-1’, in full compliance with BS as regards such kinds of works.

o Square Steel Bars 40/40/4 mm, steel sheet 100/100/20 mm, flat

bars 40/4 mm, all according to BS 4360

o Plexiglass, 6 mm thick in full compliance with BS as regards in such kinds of works.

o Back bolts, screws and nuts according to BS 916.


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2.7.2.2 Workmanship The execution of the parapet and its anchorage to the staircase

shoulders, landings and walls, shall be in full conformity with the architectural shop drawings.

The Contractor shall submit samples of the profiles for the stands,

frames, handrails, glass and anchors and shall deliver the necessary materials after the Engineer’s approval.

The manufacture and mounting of the parapet may be done only

after the approval of the shop drawings. Gasketing of glasses in the panels shall be made with neoprene strips, the same or similar to those of aluminium windows.

Profiles and sections, which have been damaged or bent during

production and transportation shall not be accepted for mounting. The Contractor is obliged to provide reliable protection to the profiles until project handing over.

Anchoring devices or profiles should secure the reliability, solidity

and perfect aluminium alignment of mounting sections and profiles. 2.7.2.3 Samples All mentioned samples shall not be smaller than 30 cm. 2.7.3 TOILETS / BATHROOM ACCESSORIES 2.7.3.1 Materials All items described here below shall be special production of well

established and experienced companies. The products shall be free of functional disadvantages, with modern design and proper appearance. All their parts and connections have to be corrosion resistant, chrome plated, enameled or china surfaced. They shall satisfy all sanitary - hygienic requirements towards them.

a) Liquid Soap Dispenser Wall mounted container of polished stainless steel, approximate

capacity 0.5 lt. and possibility to be used without touching with fingers.


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b) Powdered Soap Dispenser Wall mounted container of polished stainless steel, approximate

capacity 0.8 lt. To be used without touching with fingers. c) Sap Holder 15 x 15 cm, embedded in the glazed ceramic tiles, china type. d) Toilet Paper Holder 15 x 15 cm, embedded in the glazed ceramic tiles, china type. e) Paper Towel Dispenser Wall mounted box with front or top cover, complete with lock of

the ‘reamer’ or ‘latch’ type. all parts of the box shall be of polished stainless steel. Dimensions shall be suitable for the standard size paper towels.

f) Towel Rails Enameled or chrome plated tubular profile with shoes fit for wall

mounting of the same material. g) Shower Curtain Rods Type and dimensions as indicated on drawings. The rod shall

be of non-corroding metal (copper or brass), chrome plated, with chrome spools and clips for the curtain of the same metal. The clips shall be at a distance of no more than 6 cm from one another.

h) Coat Hooks Made of China, enameled or of chrome plated metal, as per the

Engineer’s approval. i) Wall Mirrors Plate glass 6 mm thick, perfectly smooth and with the best silver

coating on the back side. Mirrors shall have minimum dimensions 60 x 40 cm and shall be complete with 1.5 cm wide, chrome plated metal frame. They shall be fixed to the wall by means of 3 no. chrome plated holders - 2 nos. on the bottom and 1 on the top. The mirror shall be supplied by a manufacturer qualified in electrical lights.


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j-i) Grab Bars (Toilets) for Disabled These shall be with dimensions as shown on the drawings, of

chrome plated metal pipes dia 2.2 to 2.7 cm, reliably anchored into the wall.

ii) Grab Bars (Showers) for Disabled These shall be with dimensions as shown on the drawings, of


iii) Grab Bars (Eastern and Western Type WC) These shall be with dimensions as shown on the drawings, of


2.7.3.2 Workmanship Mounting of all above described accessories to the WC and

bathroom equipment shall be executed by means of original fixing equipment supplied by the manufacturer together with accessories and in a manner, which does not disturb the integrity and good appearance of the adjacent finish. Mounting shall be executed strictly at the places indicated on the drawings. The Contractor shall provide suitable conditions for the proper storage of all materials and their preservation during transportation and mounting until project handing over.

2.7.3.3 Samples The Contractor shall submit to the Engineer for approval catalogues

of a company or companies - manufacturers and the Engineer shall specify the supplier and type and catalogue number of the product.

The Contractor shall provide for the Engineer one sample of all

approved accessories to the equipment. All materials delivered to the project site shall be in full compliance

with the samples by type, size, material and surface finish. Mounting shall be made following strictly the technology and method,

described in the manufacturer’s catalogues. Wherever the method of mounting may vary or is not specified, execution shall follow an approved sample by the Engineer.

Technical Specifications Part 5: Electrical works

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5.1 GENERAL DETAILS 5.1.1 SCOPE OF WORKS 5.1.1.1 This Specification covers the supply, delivery to Site, erection, testing

and commissioning of all materials and equipment in connection with the Electrical Services of the Project, listed in the Table of Contents herein below.

5.1.1.2 All Works included in this Specification shall be fed at a system

voltage of 380V AC, 3-Phase, 4-Wire, 50 CPS, with the following tolerances :

Voltage +5% Frequency +4% 5.1.1.3 The entire works shall be carried out in strict accordance with this

Specification, the various electrical drawings and the current rules and Electrical Wiring Regulations. IEC Recommendations Publication 364 E1, Installation of Buildings.

The General Conditions of Contract including their Particular

Applications and any other special conditions shall equally apply to the Electrical Services.

5.1.1.4 The Contractor shall clarify any further details that may not be

included in this Specification, but are required for the completeness of the Project and all these shall be deemed as included in his prices and rates.

5.1.1.5 The Scope of Works in this Section of the Specification includes the

following items :

o Sub/Main Distribution Board and Distribution Boards in the Project. o Main distribution and Feeder Electrical Lines* o Lighting Installations o Power Installations o Earthing Installation o Telephone Installation o Fire Alarm System o Communication Network o Air-conditioning System


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The works listed above shall include supply, mounting and commissioning into operation, complete in every respect to the satisfaction of the Engineer and the Employer.

5.1.1.6 The required installation shall comply with ARC Specification E-9023

(attached herewith). The installation shall run in conduits sunk beneath the wall surfaces. All junction boxes, socket outlets, switches, ceiling roses etc. shall be flush mounted including electrical distribution board.

The minimum illumination levels in rooms shall be as follows :

o Workshops 500 lux o Offices 480 lux o Corridor and Store 250 lux o Toilet 150 lux

A telephone shall be installed giving the general facility of two outlets per room (office handsets and final junction box for the incoming telephone cable to be ARC supply).

Fire Alarm System, connected to the Central Fire Bridges, shall be

installed in all buildings to comply with the Safety Requirements as pert he Refinery Safety Regulations.

One electrical hand dryer of approved quality to be provided in each

toilet and one drinking water cooler to be provided outside each toilet as per the specification.

Unless specified otherwise, the Air Conditioning System shall be wall

type with winter heater in all building. Air conditioners, Westinghouse or Delchi make units, shall be provided in all rooms except toilets.

All units shall be sized in order to satisfy the following conditions in

each room :

o Maximum summer internal required temperature 23 +1oC o Maximum relative humidity required in summer 50 % o Winter relative humidity required in summer 22 +1oC o External design temperature Max. 45oC

On air extractor of approved quality and adequate capacity to be

provided in each toilet.


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Electrical works shall comply with ARC Specification E-9023. All fire fighting devices shall be designed to comply with NFPA Standards (latest editions).

5.1.2 CLIMATIC CONDITIONS The climate is dry tropical one. All electrical materials and equipment

shall be suitable for ‘Azzawiya’ climatic conditions. All materials, apparatus and equipment shall be capable of continuous, prolonged and trouble free operation.

5.1.3 DERATING Unless otherwise stated due allowance has to be made in the design

of the Electrical Installations described in the Specification for the special local climatic conditions, and all equipment, wires, cables, switches etc. specified herein have to be adequately derated.

5.1.4 STANDARDS All materials and equipment the Contractor intends to use in

Electrical Works shall comply with as a minimum :

a) The current IEC Recommendation Publication 364 Electrical Installation of Buildings.

b) The Regulations of the Institution of Electrical Engineers (IEE). c) If for certain installations and materials there are no IEE

Recommendations, the latest VDE Specifications are valid. The above refers to the quality of materials and equipment, their erection, testing etc.

5.1.5 TEST CERTIFICATES FOR THE EQUIPMENT AND MATERIALS Besides the technical information and/or samples, required by the

relevant Clauses of General Conditions of Contract for approval of equipment and materials, at least 10 (ten) days before the delivery to the site the Contractor shall submit to the Engineer’s Representative.

Copies of Test Certificates from an independent Testing Authority or

from the Manufacturer confirming that the materials and equipment comply with the requirements of this Specification.


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5.1.6 ADDITIONAL INFORMATION The Engineer reserves the right to request from the Contractor to

inspect the Plants of some of the proposed manufacturers in order to obtain more detailed information about the materials and equipment proposed and/or to attend certain tests and all this shall be made at the expense of the Contract.

5.1.7 MAINTENANCE AND INSTRUCTION MANUALS Six sets of Maintenance and Instruction Manuals and catalogues

shall be submitted for the entire electrical equipment, communication fittings and fire security and detection system and as directed by the Engineer.

5.1.8 INSPECTION AND TESTS The whole of the electrical equipment and materials shall be subject

to inspection and testing during manufacture and especially before dispatch from manufacturer’s plant, during erection on Site and upon completion.

The Contractor shall provide all necessary apparatus, measuring

instruments, tools, connections and accessories for performing the required tests.

Every test shall be carried out according to the Contractor’s and/or

Manufacturer’s proposals previously approved by the Engineer. 5.1.9 SPARE PARTS AND TOOLS The Contractor shall include in his Tender Price the cost of all

necessary spare parts and special tools that might be necessary for the complete installation and for duration of one year operation after handing over to the Engineer.

The Contractor shall present to the Engineer a priced list of

recommended spare parts which are likely to be needed for a period of at least 2 years maintenance after final handing over.

5.1.10 LABELS All electrical equipment shall be clearly labeled in English in

accordance with the inscriptions of the drawings, circuit diagrams etc. The labels shall be made of multilayer white and black plastic material, front engraved and securely fixed to the respective equipment.


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5.2 SWITCHBOARDS 5.2.1 GENERAL REQUIREMENTS In order to improve the reliability of the power supply, in the location

indicated in the drawings, sub/main distribution switchboards shall be installed and shall distribute the power for all electric consumers.

From the sub/main distribution switchboard by means of main feeder

lines with suitably sizes cross-section, the respective distribution switchboards shall be power supplied.

5.2.2 SUB/MAIN SWITCHBOARDS The sub/main distribution switchboards shall be of the floor mounting

type, made of sheet-steel with a thickness not less than 2mm and shall be suitable for operation from the front side. It shall be provided with commutation, protection and measuring facilities as indicated on the drawings.

The mechanical protection of the sub/main distribution switchboard

shall be IP 52. In accordance with the climatic conditions switchboards shall be constructed under TA (Dry Tropical version performance).

All panels shall be provided with suitable locks operated by a master

key. Three number of such master keys shall be delivered by the Contractor for each sub/main switchboard. All components shall be clearly marked and labeled with the identifications indicted on the drawings.

Each panel shall be provided with a convenient pocket containing the

circuit line diagram of the panel. The busbars shall be made of isolated high conductivity electrolytic

copper with sizes for a current loading of not more than 1.5 A/mm2 and designed for a maximum temperature not exceeding 70oC at full load and at maximum ambient temperature.

A special neutral busbar shall be erected through the whole length of

the switchboards connected by means of the fourth neutral core of the feeder lines cables to the neutral busbar of the respective transformer LV switchboard.


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All non-live metal parts of the switchboards and the equipment shall be securely bounded to the grounding busbar. The metal armature and sheaths of the outgoing lines shall be connected to the same.

All normal operating conditions this grounding busbar shall be

galvanically connected to the neutral busbar at the main switchboards.

All internal live connections shall be made of suitably sized copper

conductors, bare or PVC insulated. When bare conductors are used, the same shall be painted or marked with the phase identification colors.

All outgoing cables and wires shall be connected to the respectively

numbered terminals and fixed by safe connectors of the screw or other suitable type.

The short-circuit and overload protection of all outgoing lines shall be

achieved in principle by means of automatic circuit-breakers. The grounding and neutral busbars and connectors shall not be protected. All automatic circuit breakers shall be suitable for free tripping which shall not permit switching-on in the presence of a short circuit. The live busbars shall be protected by means of bolted covers.

The measuring instruments to be mounted on the panels shall be of

electric-magnetic type with ranges indicated on the drawings, for flush mounting and with square shape. Their class of accuracy shall be not more than 1.5%.

The instrument transformers shall be of the dry insulated type and

shall be insulated, constructed and sized to be capable to withstand all electrical, thermal and mechanical stresses to which they may be subjected in operation and particularly under short-circuit conditions. Their class of accuracy when used for measuring purposes shall be 0.5%. The rated secondary current of the current transformers shall be 5A.

All relays shall be suitable for local operating conditions, high temperature and humidity. Their contact shall be silver plated, or otherwise protected. The rated current of the contacts shall be suitable for the duty performed under the actual operating conditions.

All equipment erected in the SMSB’s shall be for a rated voltage of not less than 500V.

The Contractor shall provide the Engineer with working drawings for

all switchboards with detailed specifications and performance data of all the equipment he proposes to incorporate in them for approval.


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5.2.3. LV DISTRIBUTION BOARDS The LV Distribution Switchboard shall be with circuit diagrams,

switchgear, enclosure protection range, designation and kind of erection as indicated on the drawings and in the Bill of Quantities.

The switchboard shall be of metal structure. The single phase

outgoing lines shall be protected against short-circuit and overload by means of miniature automatic circuit-breakers with thermal and magnetic release. They shall be switched-on manually by means of a tumbler or pushbuttons.

All distributions shall be equipped with a main switch, preferably a

circuit breaker or a load break switch. The individual circuits shall be provided with circuit breakers or miniature circuit breakers. The use of fuses shall be avoided where possible.

a) Domestic type distributions shall be, wherever possible, of the

flush mounted, double insulated type. Mounting rails and modules shall be according to DIN 46277/3.

b) Industrial type distributions shall be, wherever possible of the

double insulated weather-protected type with transparent covers.

The remotely controller relays (impulse relays) for switching on and

off the lighting circuits shall be provided with electro-magnetic operating devices with mechanical retention in switched on position. The coils shall operate at 240V AC.

Installation of earth leakage circuit breakers is to be considered and

provided where necessary. ELCB is to have test button, reset button and signaling on operation as a result of an earth leakage.

Double insulation is also recommended but at present is restricted to

small machinery, light fittings and distributions only. 5.3 CABLING AND WIRING 5.3.1 GENERAL REQUIREMENTS 5.3.1.1 The electrical installation shall include the main feeder cable

connected to a distribution inside an electrical substation or another main distribution to be defined by ARC.


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Installation plans, one line diagrams, schematic and wiring diagram, load diagrams and lighting layout shall be handed over to ARC for approval within 30 days from the order date.

Initial load of branch circuits shall not exceed 65% of their capacity,

spare circuit breakers shall be provided on the basis of 20% of the circuits initially installed.

The installation shall be of good workmanship, all square and level

and fixed with components approved for the purpose used for. The following tests shall be carried out by the Contractor prior to the

mains supply being connected and Test Certificates to be handed over to ARC :

a) Earth Resistance Test b) Insulation Resistance Test c) Earth Continuity Test 5.3.1.2 The maximum current carrying capacity of every individual cable or

wire type and cross-section shall be determined by the Contractor upon consideration of the following :

o The maximum possible power to be transmitted.

o A minimum soil temperature of 25oC in 1200mm depth (thermal

soil resistivity 120 degree cm/w.

o Cable grouping.

o Kind of cable laying as per ‘Installation Details’. 5.3.1.3 The electrical and physical performance data of every cable as well

as all applied derating factors shall be taken into consideration when sizing the cross-sections.

5.3.1.4 The conductor cross section of every cable shall be adequate for

carrying the prospective fault current as determined by the next relative short circuit protection device when operating during the specified load conditions without deterioration of the di-electric.

The cables shall be sized in such a way that the voltage drop from

the transformer substation upto the last consumer shall not exceed 2.5% for the lighting installation and power installation at full load.


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The cross section of the cables shall be properly rated and in such a way that the actual maximum current shall not exceed 90% of the permissible current for a particular cross section.

Thermoplastic insulated flexible wires type NYAF to DIN 57250/VDE

0250, DIN 57281/VDE 0281 and DIN 57282/VDE 0282. Cables: Cable types NYM or NYRUZY in accordance with German

Cable Types to VDE 0271. For underground cables Type NYCWY or NYCY in accordance with German Cable Types VDE 0265.

Connectors: PVC insulated wire connectors of good quality shall be

used in junction boxes. Twisted or soldered connections are not permitted.

5.3.1.5 The phase conductors of cables and wires shall be discriminated by

colours on their entire length. The conductors of the cables shall be color coded in accordance with IEC.

The colour code for insulated conductors shall be as follows :

o black for phase o brown for switched phase (in cables also phase) o light blue for neutral o green/yellow for protective conductor (earth)

5.3.2 MULTICORE PVC INSULATED UNARMORED CABLE (PVC/PVC OR XLPE) 5.3.2.1 600/1000 V circular PVC/PVC or XLPE insulated and sheathed

cables shall have stranded conductors made of plane annealed copper wires of high conductivity and purity. The conductors shall be PVC insulated and the core insulation shall be coloured as stated for identification. The conductor insulation shall be coloured for identification. This type shall be used only as internal installation.

5.3.2.2 12/24 KV light-weight three copper core cable of type ‘XLPE’,

armoured, aluminium screened and PVC sheathed shall be used, as HV cables all over the site.

5.3.3 MINIMUM CABLE SIZES Minimum cable sizes for circuits outgoing from final distribution

boards shall be in accordance with the following schedule which gives the required cross section area of the PVC cables :


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o Lighting circuits not exceeding a load of 1800W or as indicated in the drawings. 2.5 mm2

o Distribution boards 6.0 mm2

o Circuits connecting heating and miscellaneous equipment

shall be sized in accordance with respective regulations, but shall not be less than 2.5 mm2

o Motors upto and including 1.5 KW 2.5 mm2

o Motors above 1.5 KW - cables shall be sized to conform to regulations, such that the cable rating shown is not smaller than 4.0 mm2

o Remote control circuits 2.5 mm2 Cross sections shall be calculated on a maximum voltage drop of 3%

on the furthest point. Cross sections below 1.5 mm2 shall not be used.

Insulation Resistance The minimum insulation resistance shall be 1000 ohms per volt. 5.3.4 CABLE MEASUREMENTS The Contractor shall be entirely responsible for correctly measuring

of all required cable lengths to the various distribution positions and points etc.

5.3.5 CABLE GLANDS AND CABLE MARKING 5.3.5.1 All cables shall terminate in totally enclosed junction boxes by cable

glands. 5.3.5.2 Each cable when completely installed shall receive at each end and

at intermediate positions, as may be considered necessary by the Engineer, tags with engraved identification number of the cable.


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5.4 PVC CONDUITS AND CONDUIT FITTINGS 5.4.1 GENERAL REQUIREMENTS Heavy gauge rigid conduits and conduit fittings shall be so designed

and manufactured as to ensure reliable mechanical protection to cables contained therein, and shall withstand the stresses and high temperatures liable to occur during transport storage and installation in Azzawiya Refinery site.

For surface and flush conduit installations, rigid synthetic material

conduits or flexible conduit and accessories made from hard PVC in accordance with DIN 49019 to VDE 49016.

Cable protection tubes in hard PVC in accordance with DIN

8061/8062 and hard PE in accordance with DIN 8074/8075. Rigid PVC conduits and conduit fittings shall be suitably marked and

identified by the manufacturer. Marking of conduits shall also include the nominal size. All marks

shall be indelible and easy legible. 5.4.2 CONSTRUCTION The inside and outside surfaces of conduits shall be smooth and free

from burrs, flash and similar defects. The interior and ends of conduit fittings shall have no sharp edges and surfaces and corners over which the cables are likely to be drawn shall be smooth and sell rounded.

Rigid PVC conduits shall be so constructed that it will be possible to

bend the conduit easily with the aid of a simple too. e.g. bending spring. The rigid PVC conduits and fittings shall be of the untreated type.

5.4.3 MECHANICAL AND OTHER PROPERTIES Rigid PVC conduits and conduit fittings shall have an adequate

mechanical strength and thermal stability. Compliance shall be checked by tests to the satisfaction of the Engineer.

Rigid PVC conduits and conduit fittings shall be resistant to high

temperature and shall be non-hygroscopic. They shall also be of the self-extinguishing type.


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5.4.4 NOMINAL SIZES AND DIMENSIONS Rigid PVC conduits shall be of one of the nominal sizes as follows :

20, 25, 32, 40 and 50 mm. Each length of conduit shall be 3m in length and the outside diameter and minimum wall thickness shall be as required by the respective standard specification and will be coupled by PVC slip couplers.

5.4.5 BOXES All boxes for switches, socket outlets etc. shall be of rigid PVC and

their dimensions shall be suitable for fixing the switches, sockets and other accessories specified later.

All boxes shall be provided with tapped brass inserts for fixing the

screws. Boxes and covers used with plastic, provided with means for

securely terminating the conduits. Outlet boxes shall be of size and design to suit the devices to be

fitted thereto such as socket outlets of the system concerned. Boxes used for all lighting outlets shall be fitted with steel insert clips

to provide additional support for heavy pendants. 5.4.6 TESTS Rigid PVC conduits and fittings shall satisfy the tests required by the

standard specifications to which they shall be manufactured. 5.4.7 JUNCTION BOX The junction box shall be complete with a terminal block suitable for

connecting up to a 10 mm2 copper conductor (phase, neutral and earth) and an all insulated molded white cover plate.


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5.5 LIGHTING FITTINGS 5.5.1 GENERAL The lighting fittings shall comply with all general requirements as

outlined herein unless otherwise specified or shown in the drawings. All fittings shall be of suitable for use under the prevailing conditions at the place of their installation. All lighting fittings shall meet the approval of the Engineer in all respects.

The enclosure protection range of the fittings shall comply with the

requirements of IEC, Publication 144. All lighting fittings shall have class 1 ‘Functional’ insulation with

terminals or earthing cable or plug, or class 2 ‘Double and/or reinforced insulation throughout and no provision for earthing’. All fluorescent lighting fittings shall be power factor corrected.

5.5.2 LIGHTING FITTINGS AND LIGHT INTENSITIES Lighting fittings to be supplied under the contract shall comply with

various categories as listed further below and shown in the drawings. The lighting fittings shall be complete in every respect including lamp, control gear etc. designed to continuously operate at a maximum ambient temperature of 45oC.

Fluorescent light fittings with standard 40 watt fluorescent tubes shall

be used wherever possible. The following types of light fittings are recommended for the different

applications :

a) For Offices and Similar Applications Non-weatherproof for ceiling mounting, dustproof Class 1,

Degree of Protection IP50. 1 x 40 watt 2 x 40 watt > Preferred type Novolux NLK/4/140, NLK/214/240, NKL/214/340 3 x 40 watt b) For Industrial and Outdoor Installations Weatherproof and corrosion resistant type fitting for ceiling

mounting Class II, Degree of Protection IP55. 1 x 40 watt


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d) For High Ceiling workshops and Similar Buildings Weatherproof ceiling mounting, corrosion resistant, weide

angled reflector. Degree of Protection IP55, PF Corr. lamp MBE 250 watts.

e) For Street Lighting VDE standard approved type 250 watt lamp HQL Class II PF

correction. Degree of protection lamp compartment IP44. Control gear compartment protection IP23. Refinery preferred type Siemens Stopal.

For areas near the sea special corrosion resistant and water

tight light fittings shall be required and shall be selected according to application by ARC.

5.5.3 INCANDESCENT FITTINGS Incandescent fittings shall be equipped with porcelain E.S. screw

sockets for lamps upto 200 W. Relamping of the fittings shall be possible without having to remove

the fittings from their place. The various incandescent fittings shall be as described by types in the drawings.

5.5.4 WIRING Wiring within the fittings and for connection to the branch circuit

wiring shall not be less than 1.5 mm2 for 240 V application. 5.5.5 LAMPS

a) General Lamps shall be of wattage and types as shown in the drawings.

Lamps for the permanent installation shall not be placed in the fittings until so directed by the Engineer and this shall be accomplished directly before the building areas are ready for occupancy by the Employer.

b) Fluorescent Lamps Lamps shall be rapid start and for operation at 240V unless

otherwise specified for the various fittings types indicated in the drawings. Lamps shall have bi-pin bases and a minimum approximate rated life of 12000 hours.


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c) Incandescent Lamps Incandescent lamps of 200W and below shall be of the frosted

type. Lamps shall be for operation at 240V with a minimum approximate rated life of 1000 hours.

d) Ballasts Ballasts shall be completely enclosed in a sheet steel castings

and shall have a corrosion resistant finish. All ballasts shall be of the high power factor type compensated to above 0.9 PF and shall have a noise level below 30 Db.

Unless otherwise specified all ballasts for fluorescent lamps

shall be rapid start.

5.5.6 ADDITIONAL REQUIREMENTS The control gear of all lighting fittings shall be identical and shall be

one of the following types :

a) Control gear consisting of chokes, capacitors and starters. b) Control gear consisting of ballasts and starters. The control gear for fittings with more than one lamp shall be as follows : a) 2 lamps fittings : twin tube circuit b) 3 lamps fitting : 1 twin tube circuit and one single tube circuit c) 4 lamps fitting : 2 twin tube circuits The twin tube circuit shall be ant stroboscopic.

The lighting system layout as displayed in the drawings is to be understood as guidance only and the Contractor is responsible for the proper engineering of the whole scheme according to internationally recognized illuminating calculations which are to be submitted for approval by the Engineer.

5.5.7 DESCRIPTION OF LIGHTING SYSTEM The lighting is divided principally in two parts: local and remotely

controlled.


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5.6 SWITCHES 5.6.1 SINGLE PHASE SWITCHES

a) Switches used in lighting branch circuits shall be quick-make quick-break with silver alloy contacts in an area resistant molded base, rocker operated, rated 5A, 250V AC.

Each switch shall be capable of interrupting inductive or

resisting loads up to its full rated capacity. b) It is quite necessary, when installing more than two switches in

a room to be used mulligan cover plates up to four numbers.

5.6.2 MOMENTARY ACTING SINGLE POLE PUSHBUTTONS

a) The momentary acting single pole pushbuttons for activating the impulse relays shall be 5A, 250V AC rated.

b) They shall be suitable for flush or surface installation. c) The pushbutton mechanism shall be with silver alloy contacts. d) The pushbutton plates shall be ivory molded plastic, similar to

the single phase switch plates. e) Degrees of protection shall be as indicated in the drawings and

keynote.

5.7 SOCKET OUTLETS 5.7.1 SINGLE POLE SOCKET OUTLETS

a) The socket outlets shall be for flat pin plug polarized grounding type with three pin holes, rated 16A, 250V, for surface IP43 or flush mounting IP21. The pin holes shall be suitable for three pin general purpose plugs.

b) The socket outlets shall have a molded plastic or porcelain

base and shall be designed to fit the appropriate plate - white or ivory plastic.

5.7.2 DOUBLE POLE SWITCH 20A Double pole switch 20A with pilot lamp, flush mounted.


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5.7.3 DOUBLE POLE SWITCH 45A

Double pole switch 45A with pilot lamp, flush mounted. 5.7.4 PLUGS

The plugs shall be made of ivory, break resistant, molded materials, with solid brass pins and pressing cord grip free of clamps and screws.

5.8 GENERAL ELECTRICAL INSTALLATIONS 5.8.1 GENERAL The general electrical installation shall be carried out by means of

single or multicore PVC insulated cables in conduits and accessories.

5.8.2 INSTALLATION OF CONDUITS

a) Only rigid high impact heavy gauge PVC conduits and accessories shall be used for all installations, where conduits are to be installed. The conduits shall be buried in walls and floors or run along the surface.

b) All surface fixing shall be at intervals not exceeding 0.5m for

20mm and 25mm and 2.0m for size 32mm and over. c) In addition, conduit shall be fixed not less than 150mm and

500mm respectively from each surface box or switch. d) All field bends shall be made with a bending machine or other

approved device which will not reduce the internal diameter of the conduit or injure the protective coating.

e) Low voltage wiring shall be carried out with PVC insulated wires

with copper conductors and they should not run in the same conduit carrying 240 volts circuits.

f) All conduit boxes shall be so located that covers and openings

shall be easily accessible. They shall be installed parallel with building lines and where embedded shall be flush with the surface of the finished floor, wall or ceiling.

g) The maximum number of single core PVC insulated cables run

in the conduit shall be according to IEE Regulations. h) Each final circuit shall be provided with an insulated earth

conductor green/yellow.


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5.8.3 INSTALLATION OF LIGHTING FITTINGS The lighting fittings shall be of the type indicated in the drawings. All

lighting fittings shall be furnished, installed and connected complete in every respect with all accessories.

5.8.4 INSTALLATION OF SWITCHBOARDS The method of installation of switchboards, the size of the ducts and

all other fixing details in connection with the installation shall be to the approval of the Engineer.

5.8.5 INSTALLATION OF SOCKET OUTLETS 5.8.5.1 Socket outlets and switches for lighting or other purpose are to be

flush mounted by insertion into embedded carried boxes. Junction boxes within concealed wiring shall likewise be of the flush mounted type.

5.8.5.2 The mounting height of switches etc. in closed rooms shall be as follows : a) Socket outlets wall mounted 300mm above finished floor level. b) Switches flush mounted in walls or built-in cabinets, 1400mm

above finished floor level. c) Local wall switches near doors shall be located at strike side of

doors as finally hung, whether so indicated on the drawings or not.

Switches shall be mounted with the long dimensions vertical

and with the operating handle in upward position when in the ‘ON’ position.

Single pole switches shall switch the (phase) wire or circuits.

5.8.5.3 Stairway and floor lighting fixtures shall be operated by pushbutton

switches from several points via pulse operated relays, arranged in the associated sub-distribution boards.

5.8.5.4 Air conditioners shall be fed from flush mounting automatic circuit

breaker 1-pH/220V.


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5.8.6 INSTALLATION OF POWER FEEDER CABLES

a) The proposed routes of cables are shown on the layout drawings.

b) Cable routes shall be agreed with the Engineer. c) The cable shall be installed and tested strictly in accordance

with the appropriate clauses of the IEE Regulations, the Factories Acts and BS 3346.

d) Cable shall be installed with a minimum of 300mm clearance of

any equipment or pipe work, including lagging associated with other services.

5.9 EARTHING 5.9.1 GENERAL All metal non-current conductive parts of all the electrical equipment

employed, with the exception of the cases particularly mentioned here below, shall be securely bonded to the earthing system. All earthing busbars, wires and cables shall be made of high quality electrolytic copper.

5.9.2 EARTHING THE LV SWITCHGEAR AND EQUIPMENT Each panel shall be provided with an earthing busbar separated from

the neutral busbar. The cross section of the earthing busbar shall be equal to the cross section of the phase busbars and the earthing busbar shall be extended through the whole length of the panel. The earthing busbar shall be connected to the neutral busbar by means of a removable link.

The earthing of all metal non-current conductive parts of the

switchgear and elect 415/240 V shall be made using copper wire with yellow/green PVC insulation. The earthing busbar of the LV panels shall be connected to the earthing network using copper wires.

All connections of the earthing system wires to the earthing network

and earthed components shall be made using cadmium plated bolts, nuts and spring washers. The metal surfaces connected shall always be cleaned thoroughly to metal shine.


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5.9.3 EARTHING ELECTRODES The earthing electrodes shall be connected to the earthing network

being copper coated steel core rods with a diameter of not less than 3/4” and a length of not less than 3m, made of 1.5m components provided with suitable fittings such as driving head, connectors and hammering head.

Each earthing rod end shall be located at 0.8m below ground level. 5.9.4 EARTHING RESISTANCE The earthing resistance of any point of the earthing installation to

earth shall not exceed 1.0 ohms during the dry season. The earthing resistance between any point of the earthing installation and an earthing electrode shall not exceed 0.5 ohms. Testing of the earthing resistance shall be made during the dry season. The above indicated value shall be justified on the Site. If for any reason the above indicated values cannot be reached, the Contractor shall be obliged to extend the earthing system by driving additional electrodes and/or placing additional tape until the values are justified, and all this up to the satisfaction of the Engineer.

5.10 LIGHTNING PROTECTION SYSTEM 5.10.1 DESCRIPTION & REQUIREMENTS FOR THE INSTALLATION The lightning protection system of the buildings shall consist of roof

mesh, down conductors and earthing electrodes. The roof mesh shall be done by copper tape 25/3mm, as it is shown

on the drawings. In the places shown on the drawings the new mesh shall be connected to the existing ones.

The down conductors shall be made of copper tape 25/3mm,

clamped down to the test clamp on the metal structure of a mast. Each down conductor shall terminate on a test clamp mounted at a

height of upto 0.8m above the earth level. The connection of the test clamp to the earthing electrode shall be effected with copper tape 30/4mm, partly fixed to the wall as described above and partly laid in a trench. Each set of earthing shall consist 3 no. of electrodes connected with 25/4mm copper tape.


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The earthing electrodes shall be made of copper bond steel rods driven into the earth, with diameter of 3/4” and a length of 3m. The connections of the grounding tape coming from the test clamps to the rods shall be effected by means of special connectors analogically as for the earthing system. The earthing rods shall be driven full length into the ground so that their top shall be at 80cm below the ground level. The total transient resistance of the earthing electrode system shall be less than 10 ohms.

Every joint and underground connection will be security isolated from

the aggressive sore and moisture by special compound and tape. 5.10.2 TESTING OF THE SYSTEM After completion of the lightning protection system, it shall be tested

for the transient resistance of the earthing electrodes system. The Contractor shall provide at his own expense the necessary

qualified personnel and measuring instruments to carry out the above tests in the presence of the Engineer. The Contractor shall repair or replace at his own any component of the earthing system which has proved unsatisfactory during the tests. After such repairs or replacements, the tests shall be repeated until the required results are obtained to the satisfaction of the Engineer.

5.11 TELEPHONE SYSTEM 5.11.1 GENERAL REQUIREMENTS All work related to the telephone system shall conform to the

requirements of the Communication Authority with which the Contractor shall acquaint himself. The telephone system when installed will be integrated with the internal Azzawiya Project Telephone Network to the satisfaction of the Authority, in respect of trunk lines, signaling tones, speech level, noise and other performance qualities.

The telephone equipment supplier shall be authorized distributor of

the equipment manufacturer and shall have among his local staff specialized skilled technicians for the installation, maintenance and repair of the system.

The Contractor shall supply all labour, materials, equipment, tools,

implements etc. required for installation of conduits, drawn-in and outlet boxes, distribution boxes, telephone terminal box etc.


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5.11.2 SPECIALIZED SUBCONTRACTOR If such works are executed by approved specialized subcontractor,

the Contractor shall attend on and provide all the usual services required for such attendance. This attendance shall include all necessary builders work.

5.11.3 SCOPE OF WORKS

The work shall include : a) Internal telephone wiring. b) Telephone terminal box. c) Telephone terminal outlets.

5.11.4 INTERNAL TELEPHONE SETS All internal telephone sets shall be of elegant modern design, heavy

shock resisting, antistatic, made of high quality plastic material, attractive.

all subscriber’s telephone sets shall be of the desk office type with

3m flexible black colored connecting cord and connector-plug suitable for concealed installation.

The telephone sets shall be of color approved by the Employer

(Owner) or the Engineer. Such telephone sets shall be installed in the rooms as indicated on the drawings.

All connections shall be through the telephone terminal box. The telephone outlet points shall end with a special telephone socket

outlet of a type to be approved by the respective authorities and suitable for concealed installation.

The telephone terminal boxes shall be provided with suitable terminal

blocks for terminating the incoming telephone cable and the telephone wiring going further to the different premises and other locations. The terminal block shall serve as a junction point having metallically linked clamping screws. The telephone terminal box shall be of the surface or flush mounted type.

5.11.5 INTERNAL TELEPHONE CABLING The internal telephone lines (distribution wiring) shall be done of

cables approved by respective authority. The copper cable conductors shall have 0.6mm diameter. The type of internal wiring shall be : types JYY or IY (st) Y.


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5.11.6 TELEPHONE CONDUITS AND CABLE DUCT PVC conduits and conduit fittings shall be used for the internal

telephone installations. All conduit fittings shall be manufactured and tested generally in accordance with BS 4607, Part I, 1970 and CEE Publication 26.

5.11.7 TELEPHONE OUTLETS The mounting location for telephone outlets shall be in conformity

with the drawings and will be for 4 pole plug. The telephone outlets shall be installed 300mm above finished floor level.

The following sockets shall be used :

o 4-pin communications type surface mounting socket.

o 4-pin communications type flush mounting socket. All communication sockets shall be supplied complete with 4-pin

communications plug in accordance with DIN Communication Standards.

Telephone instruments shall be of the Siemens type for desk or wall

mounting. Other types of telephone instruments i.e. industrial, weatherproof and

explosion proof types will be of the preferred types for standardization. Information will be given on request.

5.11.8 TELEPHONE TERMINAL BOXES (TTB) Flush type of TTB shall be mounted to receive incoming to distribute

personal subscriber lines. The capacity of each TTB is shown on the drawings.

5.11.9 UNDERGROUND INSTALLATION The connection between ‘Extension - Building’ and already existed

telephone exchange shall be done by cables type A-2YF(L)2Y.


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5.12 FIRE SECURITY & AUTOMATIC DETECTION SYSTEM

5.12 .1 GENERAL The fire security & automatic detection system shall be comprise

local panel with complete electronic circuits for signaling and detection any smoke ,heat and fire signals coming from sensors.

The system design shall be done in accordance following codes and standards :

NFPA 101 Safety Code for Buildings. NFPA 72 National Electrical Code.

BS 5446 Specifications for Components of Automatic Fire Alarm Systems.

BS 5839 Fire Detection and Alarm Systems in Buildings.

BS 6266 Instrument for Detection of Combustible Gasses. We recommend S24211-C424-A10 updating version SIEMENS –

Germany. 5.12.2 FIRE ALARM PANEL

An addressable system consists of a control panel connected to addressable field devices ,programmable type. The control panel shall further have the facilities to execute the display of the following :

a) Device information for I/O including mapping and massages.

b) Power system ,battery and reset system.

c) ON/OFF ( per Group ). Printing List of devices action (Alarm, faults, Configuration report and status report).

d) Maximum required (28……….. 30) element in each zone.

e) Spare capacity shall be allowed for future expansion (control panel and zones…..etc.).

5.12.3 DETECTORS Smoke Detectors: Smoke detectors are primarily specified for indoor

application with low air flows. Consequently, NFPA 72E which contains much details on location of smoke detectors in buildings shall be used as the principle reference required and distributing our proposal in canteen building .we recommended DO1101 /base DB 1101A.


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5.12.4 HEAT DETECTORS Heat detectors shall be used as a principle reference ,NFPA 72

fitting shall be used .we recommended DT1101A/DT1102A. 5.12.5 MANUAL CALL POINTS Manual call points shall be of break glass indoor type which to be

installed in Kitchen and will be distributed through the protected area in strategically position .we recommend DM 1103, 1104 or DM1101

5.12.6 AUDIBLE ALARMS (SOUNDERS) Audible alarms to be shown in the control panel .The indoor/outdoor

siren as per NFPA recommendation .lamps light sets suitable for installation ,RED light signaling the fire condition . we recommended 6 alarm sounders.

5.12.7 FACTORY ACCEPTANCE TESTS The entire system hardware& Software including I/O modules shall

be subjected to a series of tests witnessed by the Owner’s engineers at the vender’s premises before shipment.

5.13 COMMUNICATION CABLE NETWORK

5.13.1 GENERAL

The communication cable network in the Site of Azzawiya Refinery shall connect all internal PABX systems in the Administration Building. The master PABX in the Administration Building shall serve as a main one. Each outgoing trunk call shall pass through it.

5.13.2 TELEPHONE INSTALLATION Telephone cables shall be laid by copper core PVC insulated and

sheathed, unarmored, for underground installation. The exact cross section and numbers of cores is shown on the drawings (50x2x0.6).

When PVC insulated cables shall be laid underground, they shall be

laid in the ground at a minimum depth of 0.8 m below surface. A 10cm bed of soft soil or sand shall be provided below the cable and 10cm (ten centimeters) of the same material shall be laid over the cable. The soil or the sand shall be sieved clean of stones and other sharp material, and of grain size not more than 3mm. On the top of the sand layer above the cable, concrete or other approved tiles shall be placed throughout the whole length of the cable.


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In places where the underground cable shall pass below pavements, it shall be drawn through PVC cable duct protecting pipes with concrete cover places approximately at 1.10 m below the top finished level. An entry of cables in the building and at places of wall crossings, a protecting pipe of adequate diameter and with a minimum wall thickness of 2.5mm shall be used, firmly embedded. The length of the pipe extension on both sides of the walls shall be minimum 20 cm. Both ends upon the completion of the drawing operation shall be sealed with a suitable waterproof sealing compound.

At the place of entry of a cable into a pipe, a pad of sand or other

material approved by the Engineer shall be provided. Locations of the underground cables shall be marked in places as

directed by the Engineer with metal corrosion resisting plates fixed to the walls of the buildings or on concrete posts approved by the Engineer placed in the ground flush with the surface above the location of the cable.

The cable aluminium sheathing shall be used as earthing conductors.

It shall be connected to the grounding busbar of the respective switchboard(s) and to the housing of the electrical equipment and/or appliance to be earthed. The requirements of the Regulations for Electrical Installations used by IEE shall be met.

5.13.3 TELEPHONE TERMINAL BOXES As it is shown, the terminal telephone boxes shall be mounted with

the same capacity in the boxes in IP54 degree of protection outside the buildings and IP41 inside the buildings.

5.14 LV CABLE NETWORK 5.14.1 GENERAL Each SMSB’s of the new extension buildings shall be fed by the

existing Transformer Substation ES 11/1 and ES 11/3 through LV cable feeders.


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5.14.2 LV CABLE INSTALLATION Cables are described in Technical Specification Clause 5.3. Termination of all cables will be carried out only by specially trained

termination personnel. All cable terminations will be in suitable cable gland boxes, and the

lead covering correctly plumbed. At all joint boxes the steel tape of the cables will be bounded over the

joint box. Trench work will be excavated to an average 0.8 m below finished

road level. The bottom of the trench wil be completely cleaned of all stones, chipping etc. and a 10 cm depth of finely sifted sand will be laid at the bottom.

Cables will be laid on the top of thou sand and covered by a further

10 cm of sifted sand. Cable cover tiles, which will be red concrete pattern (50 x 25 x 5 cm)

be laid over for the whole length of cable run. The clean out of rocks earth removed will be taken back into the

trench and rammed to ground level. Above trenches reinforced concrete cable markers, inscribed ‘LV’ wil

be installed at intervals of not more than 30 m. LV cable crossing shall be done by protection PVC Φ 100 mm pipes

cement casted. Fh/Tech/june09

Documents

9R4944 - 0424 - EPC BD Vol II - Exhibit C2.2 - Technical Specifications Annex B