Specification for Wrapping Tape

7/25/2019 Specification for Wrapping Tape

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JOB No. DOC. No. Rev.

0-5151-20 S-900-13A0-005 4

DATE 28 - Jul - 2011 SHEET 1 OF 17

PREPD A. Alvero

CHKD K. Horikiri

APP'D M. Sakai

REV. Date Page DESCRIPTION PRED CHKD APPD

A1 11 Oct 07 All For Deliverable N.B. K.T. M.S.

0 28 Jul 2011 All For Review A. Alvero K. Horikiri M. Sakai

1 09 Sep 2011 All For Construction (As per Clients Comments) A. Alvero K. Horikiri M. Sakai

2 21 Mar 2012 All For Construction (Added Insulation for U/G) A. Alvero T. Imashiro M. Sakai

3 22 May 2012 All For Construction A. Alvero T. Imashiro M. Sakai4 14 Feb 2013 7 For Construction (Added Electrical in Para. 3.3 (7)) A. Alvero T. Imashiro M. Sakai

SPECIFICATION FOR WRAPPING TAPEOF UNDERGROUND STEEL PIPE

Donggi Senoro LNG Project

FOR CONSTRUCTION

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DSLNG Project Job No. : 0-5151-20Doc. No. : S-900-13A0-005 < Rev. 4>

SPECIFICATION FOR WRAPPING TAPE OFUNDERGROUND STEEL PIPE

SHEET 2 OF 17

Contents

1 GENERAL........................................................................................................................................3

2 REFERENCE DOCUMENT.............................................................................................................3

3 WRAPPING SYSTEM .....................................................................................................................3

3.1 Acceptable Wrapping Materials..................................................................................................33.2 Handling and Storage of Materials..............................................................................................43.3 Application Procedure ................................................................................................................43.4 Repairs of Wrapping...................................................................................................................63.5 Inspection for Wrapping Work.....................................................................................................7

ATTACHMENT-1 ....................................................................................................................................8

ATTACHMENT-2 ..................................................................................................................................17

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1 GENERAL

This specification covers the minimum requirements for external corrosion protection forunderground carbon steel, stainless steel and galvanized steel piping for the Donggi-SenoroLNG Project at field.

2 REFERENCE DOCUMENT

The requirements contained in the latest editions of the following standards shall form a partof this specification, in the manner and to the extent indicated herein:

(1) SSPC: Steel Structures Painting Council Volume 2, Systems and Specifications:Chapter 2.0

(2) NACE RP0274: High Voltage Electrical Inspection of Pipeline Coatings Prior toInstallation

3 WRAPPING SYSTEM

3.1 Acceptable Wrapping Materials

(1) Priming for Tape Wrapping

Polyken Primer No. 1027 or equivalentThe primers consist of butyl based elastomers blended with polymeric resins dissolvedin an organic solvent system. The primer shall be capable of withstanding continuousheat exposure to temperature range up to 85C.

(2) Mastic and Mastic Strip

Polyken No. 939 Polyethylene or equivalent50 mm wide tape is preferable.The mastic and mastic strip shall be capable of withstanding continuous heatexposure to temperature range up to 85C.

(3) Inner Wrapping for pipes and welding connections

Polyken No. 980 Polyethylene or equivalent50 mm, 100 mm or 150 mm wide tape is preferable.

Standard thickness is 20 mils (0.500 mm)The inner wrapping for pipes and welding connections shall be capable ofwithstanding continuous heat exposure to temperature range up to 85 C.

(4) Inner Wrapping for flanges, valves and other fittings

Polyken No. 930 Polyethylene or equivalent50 mm or 100 mm wide tape is preferable.Standard thickness is 35 mils (0.889 mm)The inner wrapping for flanges, valves and other fittings shall be capable ofwithstanding continuous heat exposure to temperature range up to 66C.

(5) Outer Wrapping for pipes and welding connections

Polyken No. 955 Polyethylene or equivalent

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50 mm, 100 mm or 150 mm wide tape is preferable.Standard thickness is 20 mils (0.500 mm)The outer wrapping for pipes and welding connections shall be capable ofwithstanding continuous heat exposure to temperature range up to 85C.

(6) Outer Wrapping for flanges, valves and other fittings

Polyken No. 954 or No. 955 Polyethylene, or equivalent50 mm or 100 mm wide tape ispreferable.Standard thickness is 15 mils (0.381 mm)The outer wrapping for flanges, valves and other fittings shall be capable ofwithstanding continuous heat exposure to temperature range up to 85C.

(7) Insulation Tape and Adhesive Tape

Sekisui insulation heat-retention tape HT5CW or equivalent.Standard thickness is 5mm, 75mm wide tape is preferable.Sekisui adhesive tape NLT-30T/50T or equivalent.Standard thickness is 0.2mm, 30mm or 50mm wide tape is preferable.

3.2 Handling and Storage of Materials

(1) Handling

Use of hooks, ropes of any kind, chains, cable or other sharp devices shall not bepermitted when transferred the wrapping tape. Coated and wrapped pipe shall behandled at all time with wide non-abrasive canvas or leather belts, or other equipment

designed to prevent damage to coating.

(2) Storage

All the wrapping materials shall be stored in accordance with the manufacturer'sspecification.

3.3 Application Procedure

The procedure for applying wrapping materials to each part of the piping assemblies isdrawn on the sketches attached hereunder.Details shall be referred Fig. 1 to 8 of Attachment-1.

(1) General

(a) The wrapping work on the welding points shall be performed after the test forpiping is completed.

(b) Wrapping work shall not be done when it is rainy, dusty, freezing, or in suchweather as will adversely affect the wrapping work, (except where protectivefacilities and sufficient protections are provided).

(c) Rolls of wrapping tape can be applied by means of suitable mechanicalwrapping equipment or hand application as approved by the tape manufacturer.Sufficient tension shall be applied to ensure complete conformability and

intimate adhesion of the tape to the surface and to avoid air pocket.

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SHEET 5 OF 17

(2) Surface Preparation

(a) Carbon Steel and Stainless Steel

Carbon steel and stainless steel surface of pipes, fittings and field welds shall becleaned by power tool to SSPC-SP 3 combined with hand tool to SSPC-SP 2. Weldspatters, projections, sharp edges or indentations, burrs shall be ground smooth. Oil,grease, and other contaminants shall be removed by a suitable solvent according toSSPC-SP 1. Salt contamination, chemical cleaning agents and remaining detergentsshall be washed off using potable water. Cleaned field welds do not require paintpriming before the application of the tape primer and wrapping. Steel surface of pipesshall be cleaned and dry prior to primer application.

The application of the tape primer and wrapping shall be in accordance with therespective procedures listed below and may be supplemented with the Manufacturers

application procedure.

(b) Galvanized Steel

Oil, grease, and other contaminants shall be removed by a suitable solvent accordingto SSPC-SP 1. Salt contamination, chemical cleaning agents and remainingdetergents shall be washed off using potable water. Cleaned field welds do not requirepaint priming before the application of the tape primer and wrapping. Steel surface ofpipes shall be cleaned and dry prior to primer application.

(3) Priming

The surface of the pipes shall be cleaned and dried prior to primer application.Immediately after cleaning and dry by surface preparation, brush applies tape primeror with roller-spreader in accordance with manufacturers recommendations. Rate ofprimer application shall be from 0.1-0.2L/m2. Primer shall be applied to a uniformthickness and shall be free of floods, runs, sags and drips. The primer shall be tacky todry at the time the tape is applied.

(4) Tamping of Filler Materials

Mastic and mastic strip shall be used for filling the gaps and molding of the irregularshapes of underground pipes, such as parts around the bolts and nuts on the flangeconnection, valve, etc. (Refer to Fig. 4 and 5)Mastic strip shall be put between wrapped piping and supports for protection of thewrapped piping (Refer to Fig. 6).

(5) Innerwrap Tape Wrapping

Wrapping of innerwrap tape shall be conducted when the primer has been half-dried.Wrapping shall be completed where the primer paste has been coated on that day,and the primer-coated surface shall not be left without wrapping to the following day.

(a) Straight pipes, elbows and tees, etc. (Refer to Fig. 1, 2 and 3)

Tape shall be applied spirally with a minimum overlap of 50 percent.

The tape shall be applied to ensure uniformity of tension and spiral directionduringapplication by manual or using wrapping tools.

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SHEET 6 OF 17

Basically apply in double layer, completely overlapping tape on the startingandending portions of the piping. The tape wrapping shall be finished on theside of the piping where the end of the tape faces downwards (Refer to Fig.1). These ends shall be cut using cutters or knives.

(b) Flanges, valves and other fittings (Refer to Fig. 4 and 5)

Cut tape to adequate lengths according to the configurations of the surfaces tobe wrapped, and apply these pieces of the tape to the surfaces tightly accordingto the overlapping allowance specified in the manufacturer's specification.

(c) Welding connections (Refer to Fig. 7)

Apply in single layer, 100 mm wide tape to the weld line tightly as stretching it.

Subsequently, the same wrapping procedure as that for straight pipes, elbowsand tees shall be applied.

(d) Through the wall (Refer to Fig. 8)

After the straight pipe is wrapped as aforesaid, insert the said wrapped pipe intothe penetration hole and fix the pipe in position. Clearance between the pipe andthe hole shall be filled with mastic or materials instructed by company.

(e) Riser portion

Wrapping shall be applied to the riser portions of the underground piping (incl.pipes, elbows, tees, flanges, valves and other fittings) up to 300 mm fromground level. Tape shall be wrapped upward from the bottom of the piping.

(6) Outerwrap Tape Wrapping

In a similar manner to the above, stretch the outerwrap tape and wrap it tightly anduniformly around the surfaces of the innerwrap tape on straight pipes, elbows, flanges,valves and other fittings, etc., with a minimum overlap of 50 percent.

(7) Where a clearance between underground Hot Oil Piping and Electrical Cables is lessthan 600 mm, insulation tape shall be applied with 10mm thickness and overlap of aminimum 50 percent on wrapping tape. Subsequently adhesive tape shall be wrappedtightly on insulation tape uniformly. (Refer to Fig. 9).

3.4 Repairs of Wrapping

Small defects or damage on the wrapping shall be repaired as follows:

(1) The outer and inner wraps around the damaged area shall be removed and clean tothe bare steel surface. Apply primer immediately to the bare steel surface and patchwith the inner wraps while the primer is tacky. The patch shall overlap by at least 100mm on each side over the repair area. Apply primer over the patch area andcircumferential repair area and finish it with the spiral wrap.

(2) The repair procedure shall be reviewed and approved by the Contractor before

starting the repair work. The repair procedure shall be in accordance with the wrappingtape manufacturers instruction.

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(3) The repaired location, inspection, etc. shall be recorded.

3.5 Inspection for Wrapping Work

(1) A holiday test shall be carried out using an adjustable high voltage holiday tester byapplying in accordance with NACE RP0274. The test voltage shall be checked at leastonce per shift using a special high voltage meter. When the holiday test is carried outthe external pipe surface shall be free of moisture. The electrode shall be moved overthe pipe surface with a speed not more than 0.3 meters per second. Holiday test shallbe performed on completely wrapped piping system. Any defects shall be repaired inaccordance with paragraph 3.4. The whole surface shall be visually inspected. Ageneral form of field inspection check list is shown in Attachment 2.

(2) Contractor inspection shall include, but not be limited to:

(a) Receipt and correct storage of coating materials (primer, filler, innerwrap tapeand outerwrap tape)

(b) Standard of cleaning of substrates immediately prior to surface preparation

(c) Dew point and surface temperature during surface preparation and coatingoperations

(d) Surface preparation standard

(e) Metal defects, dust, and surface debris, on the surface after surface preparation

(f) Uniformity of coatings

(g) Holiday detection

(h) Coating defects and their correct repair

(i) Correct calibration of inspection instruments

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ATTACHMENT-1

Note: The tape shall be applied spirally with a minimum overlap of 50 percent.

Fig. 1 UNDERGROUND PIPING (STRAIGHT PIPE)

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Fig. 2 UNDERGROUND PIPING (ELBOW)

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Fig. 3 UNDERGROUND PIPING (TEES)

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Fig. 4 UNDERGROUND PIPING (FLANGE)

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Fig. 5 UNDERGROUND PIPING (VALVES)

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Fig. 6 UNDERGROUND PIPING (SUPPORTS)

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Fig. 7 UNDERGROUND PIPING (WELDING POINT)

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Note: Clearance between the pipe and the walls hole shall be filled with mastic or materialsinstructed by the company.

Fig. 8 UNDERGROUND PIPING (THROUGH THE WALL)

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SHEET 16 OF 17

Note 1) The Insulation tape shall be applied with 10mm thickness and overlap of 50 percent onwrapping tape.

2) Subsequently adhesive tape shall be applied on Insulation tape.

Fig. 9 UNDERGROUND INSULATION FOR HOT OIL PIPE

Wrapping Tape

Pipe

Insulation Tape(10mm)

Adhesive Tape

Overwrap Insulation Tape

A-A Section

A

A

Pipe

Wrapping Tape

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SHEET 17 OF 17

ATTACHMENT-2

INSPECTION REPORT FOR WRAPPING

Document No. Sheet No.

Job No.: 0-5151-20

Company: PT Donggi Senoro LNG

Project Name: Donggi Senoro LNG Project

Area of Unit:

Line Number:

Item Spec

Condition Holiday Test

Date Remarks

Atmos-

pheric

Temp

(C)

Substrate

Surface

Temp

(C)

Relative

Humidity

(%) Weather

Visual

Inspection Voltage:

Sat Unsat Sat UnsatRemaining

Holidays

Surface

Preparation

SSPC-SP3combinewithSSPC-SP2

N.A. N.A. N.A.

Mastic

N.A. N.A. N.A.

Primer

N.A. N.A. N.A.

Inner Wrap

N.A. N.A. N.A.

Outer wrap

. Others:

Signature: Company Contractor Subcontractor Applicator

Date: , , , , , , , ,

Inspected by:

Witnessed / Reviewed by:

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Specification for Wrapping Tape