BOTSWANA STANDARD BOS 304:2009

BO

S 30

4:20

09

Fire fighting equipment — Components of underground and aboveground hydrant systems

BOTSWANA BUREAU OF STANDARDS

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BOS 304:2009

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Contents Page

Foreword ............................................................................................................................................................. ii

1 Scope ...................................................................................................................................................... 1

2 Normative references ............................................................................................................................ 1

3 Terms and definitions ........................................................................................................................... 1

4 Type ........................................................................................................................................................ 2 4.1 Underground type components ............................................................................................................ 2 4.2 Above-ground type components .......................................................................................................... 2

5 Materials ................................................................................................................................................. 2 5.1 General .................................................................................................................................................... 2 5.2 Cast iron ................................................................................................................................................. 2 5.3 Copper tubing ........................................................................................................................................ 2 5.4 Brass tubing ........................................................................................................................................... 2 5.5 Rubber components .............................................................................................................................. 2 5.6 Copper alloys ......................................................................................................................................... 3 5.7 Aluminium alloys ................................................................................................................................... 3 5.8 Other alloys ............................................................................................................................................ 3

6 Constructional requirements ............................................................................................................... 4 6.1 Underground type components ............................................................................................................ 4 6.2 Above-ground type components .......................................................................................................... 6 6.3 General components ............................................................................................................................. 7 6.4 Finish ...................................................................................................................................................... 7 6.5 Burst resistance ..................................................................................................................................... 7

7 Performance requirements ................................................................................................................... 7 7.1 Capacity of valves .................................................................................................................................. 7 7.2 Resistance of hydraulic pressure ......................................................................................................... 8

8 Marking ................................................................................................................................................... 8

9 Sampling and compliance with the specification .............................................................................. 8 9.1 Sampling ................................................................................................................................................. 8 9.2 Compliance with the specification ....................................................................................................... 9

10 Inspection and methods of test ........................................................................................................... 9 10.1 Inspection ............................................................................................................................................... 9 10.2 Capacity test for valves ........................................................................................................................ 9 10.3 Pressure test for components .............................................................................................................. 9 10.4 Burst test for above ground hydrant valves ....................................................................................... 9

Annex A (Normative) Notes to purchasers .................................................................................................... 19

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Foreword

This Botswana standard was approved by the Technical Advisory Committee of the Standards Council on 2009-05-26.

The Botswana Bureau of Standards (BOBS) was established under the Standards Act No.16 of 1995 with a primary responsibility of preparing Botswana Standards.

During the preparation of this standard, assistance was derived from the South African standard SANS 1128-1:1977 � Fire fighting equipment-components of underground and aboveground hydrant systems, published by the South African Bureau of Standards.

During the preparation of this standard, the following member organizations were directly represented in the Fire Safety Technical Committee MED 6:

Department of building and Engineering services Mr A Marshall (Chairperson)

Botswana Bureau of Standards Mr U Monyatsi (Technical Secretary)

Afrox Botswana Mr T Boshoff

Botswana Bureau of Standards Mr T Tlhomelang

Botsfire Mr M Bishop

Department of building and Engineering services Mr A Marshall

Department of civil aviation Mr W Ntshimane

Gaborone Private Hospital Mr D Mosweu

Okavango Electronics Mr G Clarke

University of Botswana Mr K Kanyarusoke Faculty of engineering and technology

Published by: Botswana Bureau of Standards Private Bag BO 48 Gaborone Botswana Telephone: +267 390 3200 Fax: +267 390 3120 Email: infoc@hq.bobstandards.bw Website: www.bobstanrdards.bw 13.220.10;23.060.99 �Botswana Bureau of Standards, 2009

BOS 304:2009

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Fire fighting equipment — Components of underground and aboveground hydrant systems

1 Scope

This standard specifies requirement for major components (including the connections) of two types of hydrant assemblies.

NOTE Requirements that must be specified by the purchaser are listed in Annex A.

2 Normative references

The following normative documents contain provisions which, through reference in this text, constitute provisions of this Standard. For dated references, subsequent amendments to, or revisions of, any of these publications do not apply. However, parties to agreements based on this Standard are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. For undated references, the latest edition of the normative document referred to applies. Botswana Bureau of Standards maintains a register of currently valid Standards.

BOS 305, Fire fighting equipment - Hose couplings, connectors, and branch pipe and nozzle connections.

BS 1452, Grey iron castings.

BS 1490, Aluminium and aluminium alloy ingots and castings.

BS 2872, Copper and copper alloys-forging stock and forgings.

BS 2874, Copper and copper alloys-rods and sections (other than forging stock).

BS 4504 Flanges and bolting for pipes, valves and fittings- metric series.

ISO 261, ISO general purpose metric screw threads-general plan.

SANS 135, ISO metric bolts, screws, and nuts (hexagon and square)-coarse thread free fit series).

SANS 136, ISO metric precision hexagon-head bolts and screws, and hexagon nuts-coarse thread medium fit series.

SANS 200, Copper alloy ingots and castings.

SANS 460, Copper tubes for domestic plumbing services.

SANS 665, Cast iron gate valves for general purposes.

SANS 974-1, Rubber joint rings (non cellular)-Part 1: Joint rings for use in water, sewer and drainage systems.

SANS 990, Aluminium and aluminium alloys and castings.

SANS 1109, ISO pipe threads for pipes and fittings where pressure-tight joints are made on the threads.

BOS 305, Fire fighting equipment - Hose couplings, connectors, and branch pipe and nozzle connections.

3 Terms and definitions

For the purposes of this document the following definitions shall apply:

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3.1 acceptable: In relation to the standardisation mark and to consignment inspections carried out by the Bureau, acceptable to the Botswana Bureau of Standards.

3.2 defective: A component that fails in one or more respects to comply with the relevant requirements of this specification.

3.3 lot: Not less than 15 and not more than 600 components of the same type, design, and material(s), from one manufacturer, submitted at any one time for inspection and testing.

4 Type

4.1 Underground type components

Underground type components shall be of one (or more) of the following types, as specified by the purchaser:

a) Underground hydrant valves;

b) Gate valve outlet bends;

c) Underground hydrant valve outlet connections; and or

d) Portable standpipes.

NOTE An underground hydrant assembly requires one of each of the major components listed in (a), (b), and (d), and, when relevant (c) above.

4.2 Above-ground type components

Above-ground type components shall be of one (or more) of the following types, as specified by the purchaser:

a) Above-ground hydrant valves;

b) Above-ground hydrant valve outlet connections; and or

c) Hydrant valve outlet adapters.

NOTE An above-ground hydrant assembly requires one of each of the above major components.

5 Materials

5.1 General

The material(s) of each component shall be as shown in Table 1.

5.2 Cast iron

Cast iron shall comply with the relevant requirements for Grade 220 or better of BS 1452.

5.3 Copper tubing

Copper tubing shall comply with the relevant requirements of SANS 460 for half-hard tubing of copper of designation Cu-DHP.

5.4 Brass tubing

Brass tubing shall comply with the requirements of SANS 460 for CuZn37.

5.5 Rubber components

The material used for rubber components shall be of a quality at least equal to:

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a) For seat washers: chloroprene or butyl rubber reinforced with at least five plies of nylon or cotton that are distinctly separate from each other, each strand of reinforcing material being totally embedded in, and completely bonded to the rubber compound.

b) For sealing washers and joint rings: chloroprene or butyl rubber, the washers and rings complying with the relevant requirements for rings of hardness grade Class C of SANS 974, Part 1.

5.6 Copper alloys

Copper alloys shall be of the following types, as relevant:

a) Gun metal - commercial grade (Cu 80% min.);

b) Bronze - SANS 200 CuSn10P code number 1C;

c) Extruded brass bar - BS 2874 code number CZ121 3Pb;

d) Hot brass pressings - BS 2872 code number CZ122; and

e) Manganese bronze stampings - BS 2872 code number CZ114.

5.7 Aluminium alloys

Aluminium alloys shall comply with the requirements for:

a) the alloy designated LM 4 of BS 1490; or

b) alloy of code SA 10 of SANS 990.

5.8 Other alloys

Other alloys shall be of acceptable quality and suitable for purposes for which they are intended.

Table 1 - Materials

1 2 3

Component Material Subsection

a) Aboveground type

i. Blank caps...............

ii. Hydrant valves

Body.........................

Handwheel...............

Handwheel nut.........

Seat washer.............

Spindle....................

Spindle nut..............

Tamperproof key type handle

iii. Hydrant valve outlet connection..

iv. Hydrant valve outlet adapters....

Brass pressings, bronze, malleable iron, or aluminium alloy.

Gun metal or aluminium alloy

Bronze, cast iron, malleable iron, or aluminium alloy

Gun metal or aluminium or aluminium alloy

Rubber (reinforced)

Gun metal, stainless steel, or bronze

Gun metal, brass bar, or manganese bronze

Bronze, mild steel forging, steel fabrication, or aluminium alloy

Bronze, cast iron or aluminium alloy

Bronze, gun metal or aluminium alloy

6.2.1

6.2.1.1

6.2.1.5

6.2.1.2

6.2.1.5

6.2.1.5

6.2.2

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Table 1 Continued )(

1 2 3

Component Material Subsection

b) Underground type

i. Blank caps...............

ii. Hydrant valves (screw down type)...............

Body........................

Seat washer.............

Spindle....................

Spindle nut..............

iii. Hydrant valve outlet connections.............

iv. Portable standpipes...

Inlet connection.........

Outlet connection......

v. Gate valve outlet bends......

c) General

Sealing rings..........

Cast iron or aluminium alloy

Cast iron or aluminium alloy

Rubber (reinforced)

Bronze or stainless steel

Gun metal or manganese bronze

Cast iron, gun metal, brass pressings or aluminium alloy

Copper, brass, aluminium, mild steel or aluminium alloy

Cast iron, bronze or aluminium alloy

Cast iron, bronze or aluminium alloy

Cast iron or aluminium alloy

Rubber

6.2.3

6.3.1

6.1.1.2

6.1.3

6.1.4

6.1.4.2

6.1.4.3

6.1.2

6 Constructional requirements

6.1 Underground type components

6.1.1 Underground hydrant valves

An underground hydrant valve shall unless otherwise specified by the purchaser, open in a clockwise direction, and shall be of the types the, as specified by the purchaser:

6.1.1.1 Gate valves

A gate valve of nominal size 80 mm and complying with the requirements of class 16 valves (with non-rising spindles) of SANS 665.

6.1.1.2 Screw down valves

A valve as generally shown in Figure 1 and constructed as follows:

a) The gland or cover assembly, or both, shall have a flange that is bolted to a horizontal mating flange on the valve body and shall be so designed that, when the gland or cover assembly, or both, are removed, there is full access to all the interior parts of the valve, while the casing remains fixed in position.

b) The internal diameter of the inlet shall be at least 64 mm.

c) The outlet shall have a bore of 70 mm and shall be flanged to mate with the flange of the underground outlet connection specified in 6.1.3.

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d) The dimensions of the spindle in valve cap shall conform to those given for the spindle and cap of 65 mm class 16 valves of SANS 665.

e) The seating face in the casing shall be machined and shall be of width of at least 6 mm and raised to be a height of at least 2 mm above the surrounding body material.

f) The diameters of a valve clack and of its rubber sealing ring shall be such as to ensure a mating surface that is at least 6 mm wide

g) The outlet connection (female) shall be:

i) fixed or replaceable as required; and

ii) a twist release type (i.e. cam release) unless otherwise specified.

6.1.2 Gate valve outlet bends (see Figure 2).

The inlet and outlet of an outlet bend shall be flanged to suit the flange of the gate valve (see 6.1.1.1) and the flange of the outlet connecting specified in 6.1.3 respectively.

6.1.3 Underground hydrant valve outlet connections

The inlet of the outlet connection shall be furnished with a fixed or loose flange, as specified by the purchaser, and the outlet shall be of the bayonet, vee-thread, or round thread type, as specified by the purchaser and as shown in the appropriate of Figures 3, 4, and 5.

6.1.4 Portable stand pipes (see Figure 6 )

6.1.4.1 General

A standpipe shall be of nominal bore at least 60 mm and thickness at least 2mm and shall have inlet and outlet connections fixed to the pipe in an acceptable manner. The inlet connection shall be of a bayonet or a screw type (see 6.1.4.2 below), as specified by the purchaser, and of design such as to mate the appropriate outlet connection in 6.1.3. The outlet connection shall be as specified in 6.1.4.3 below.

6.1.4.2 Inlet connection

6.1.4.2.1 Bayonet type

Unless otherwise specified by the purchaser, the mating threads on the bayonet pin on the inlet fitting shall be of nominal size 80 mm having a pinch of 3 mm and complying with the relevant requirements of ISO 261. The length and position of the thread on the fitting shall be such that:

a) with the pin in its lowest position with six full threads engaged, the distance between the top of the pin and the seat of the fitting is not more than 40 mm, and

b) it is possible to screw the pin up through a distance (relative to the longitudinal axis of the stand pipe) of at least 25 mm without the number of engaged threads being less than six.

6.1.4.2.2 Screw type (see Figures 4, 5, 6, and 7)

The thread on a screw type inlet shall be a 2 t.p.i. round thread or a 5 t.p.i. whitworth thread, as specified by the purchaser, and the dimensions of the thread shall conform to the appropriate values given in Table 2 and Table 3.

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Table 2 – Dimensions (in mm) of round thread (Basic form as in Figure 7)

1 2 3

Male thread Female thread

Major diameter 83.0050.000.0

�� 84.5

00.050.0�

Minor diameter 68.00 max 70.500.050.0�

Table 3 - Dimensions (in mm) of vee-thread (Basic form is whitworth 5 t.p.i.)

1 2 3

Major diameter

Male thread Female thread

83.00 50.000.0

�� 83.50

00.050.0�

Effective diameter 79.50 50.000.0

�� 80.00

00.050.0�

Minor Diameter 77.00 50.000.0

�� 77.00

00.050.0�

6.1.4.3 Outlet connection

The outlet connection shall consist of one or two 65 mm instantaneous connections (the relevant dimensions of which comply with those given in Figure 8), as specified by the purchaser, and shall be fitted to the stand pipe by means of either a female thread of nominal size 65 mm and that complies with the relevant requirements of SANS 1109 (see Figure 8) or in acceptable swivel head arrangement.

6.2 Above-ground type components

6.2.1 Above-ground hydrant valves

The direction of opening for an above ground hydrant valve shall, unless otherwise specified by the purchaser, be anti-clockwise.

6.2.1.1 A valve body

6.2.1.1.1 The inlet of the valve shall be of nominal size 80 mm and shall be flanged or threaded, as specified by the purchaser.

6.2.1.1.2 Flanges shall comply with the requirements given in table 16 of BS 4504 relevant to the type of flange material, and a threaded inlet shall comply with the relevant requirements of SANS 1109.

6.2.1.1.3 The outlet of the valve of the upwards oblique, downwards oblique, right angle or straight through pattern (see Figure 9), as specified by the purchaser.

6.2.1.1.4 The outlet shall have a bore of at least 60 mm and shall be furnished with one of the following connections, as specified by the purchaser:

a) A 65 mm instantaneous connection integrally cast with the body, or

b) A separate 65 mm instantaneous coupling or other connection, as relevant (see 6.2.2), screwed onto the body (as shown in Figure 8).

6.2.1.2 Valve spindle

For a fixed handwheel the top of the spindle shall be plain, and for a tamperproof key type handle, it shall be sheathed. Unless otherwise required a sheath shall be fixed by means of a peened pin. Sheathed valve spindles shall be as shown in Figure 10 and of the open type (as shown in Figure 11) or the shielded type,

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(with the spindle not protruding beyond the sheath), as specified by the purchaser. The dimensions of the spindle and of the sheath shall conform to those given in figure 10. The spindle shall have an acme screw thread.

6.2.1.3 Valve clack

The clack shall be of a swivel type, fixed by means of a stainless steel circlip or by any other acceptable stainless steel retainer.

6.2.1.4 Valve gland

The gland shall be designed for use with packing rings or “O” rings, as specified by the purchaser.

6.2.1.5 Operating device

The operating device shall be of the fixed wheel type (with rim and spokes and of outside diameter 150 mm ± 10 mm or the tamperproof key type (conforming to the requirements given in Figure 12), as specified by the purchaser, and suitable to accept the appropriate spindle (see 6.2.1.2 above).

6.2.2 Separate hydrant valve outlet coupling.

A separate hydrant valve coupling shall have a female threaded inlet to suit the screwing of the hydrant valve outlet (see 6.2.1.1.4 (b) and Figure 8). Unless otherwise specified by the purchaser, the outlet of the coupling shall be of 65 mm, instantaneous type.

6.2.3 Hydrant valve outlet adapter

The adapter for a hydrant valve shall have an inlet of the type specified by the purchaser and a 65 mm instantaneous outlet connection (see Figure 13).

6.3 General components

6.3.1 Blank cap

A blank cap (male or female, as relevant) shall, when so specified by the purchaser, be furnished for each outlet, and the cap shall be fixed to the component by means of a chain.

6.3.2 Bolts and nuts

Except for special bolts and nuts, the design of which shall be such that they will ensure sturdy, water tight, and neat joint(s), bolt and nut shall comply with the appropriate requirements of SANS 135 or SANS 136.

6.4 Finish

All metal components shall be free from burrs, pits, sharp edges, blow holes and plugged blow holes, and bores shall have a smooth finish. Feather edges (e.g. on round threads) shall have been removed. The external surface of an above-ground hydrant valves shall be acceptably smooth, clean, neat and free of scour marks and, when so required, polished.

6.5 Burst resistance

When an above ground hydrant valve is tested in accordance with 10.4, it shall not burst or suffer such damage as would impair its normal operation.

7 Performance requirements

7.1 Capacity of valves

When tested in accordance with 10.2 at an inlet pressure of 220 kPa, a hydrant valve shall deliver at least 2400 L of water per minute.

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7.2 Resistance of hydraulic pressure

When a component is tested in accordance with 10.3 at a water pressure of 2000 kPa,

a) the body of the component shall withstand the water pressure without leaking, distorting or breaking, and

b) in the case of a valve,

i) there shall be no sticking, jamming, or binding of the spindle, and

ii) the seat shall not leak or weep.

8 Marking

8.1 Each component shall be legibly marked (by stamping or embossing) with the manufacture’s name, trade name, or trade mark.

8.2 The direction of opening of an above-ground hydrant valve shall be marked (with words and arrows either indented 2 mm or raised 1 mm) on the surface of the handwheel or handle (as relevant).

9 Sampling and compliance with the specification

NOTE This section applies to the sampling for inspection and testing before acceptance or rejection of single lots (consignments) in cases where no information about the implementation of quality control or testing during manufacture is available to help in the assessing the quality of the lot.

9.1 Sampling

The following sampling procedure shall be applied in the determining whether a lot complies with relevant requirements of the specification. The samples so taken shall be deemed to represent the lot.

9.1.1 Sample for inspection

From the lot take at random the number of components in column 2 of Table 4 relative to the appropriate lot size shown in column 1.

9.1.2 Sample for testing

After inspection (see 10.1) of the sample drawn in accordance with 9.1.1, take from it at random the appropriate number shown in column 4 of Table 4.

Table 4 – Sample sizes and acceptance number

1 2 3 4

Lot size, components

Sample for inspection Sample for testing, components Sample size, components Acceptance number

15-25

26-100

101-200

201-600

5

8

11

18

0

0

1

2

1

2

3

4

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9.2 Compliance with the specification

The lot shall be deemed to comply with the relevant requirements of the specification if

a) after inspection of the sample taken in accordance with 9.1.1, the number of defectives found does not exceed the appropriate acceptance number given in column 3 of Table 4, and

b) after testing of the sample taken in accordance with 9.1.2, no defective is found.

10 Inspection and methods of test

10.1 Inspection

Inspect and measure the components taken in accordance with 9.1.1 for compliance with all the relevant requirements of sections 4, 5, 6 and 8, compliance with which is not assessed by the test given in 10.2 and 10.3.

10.2 Capacity test for valves

Connect the inlet of the valve to a suitable water supply and, with the valve in the open position. Increase the inlet water pressure to 220 kPa. Measure the rate of delivery and check for compliance with 7.1.

10.3 Pressure test for components

Connect the inlet of the component to a suitable water supply. With, in the case of valves, the gate or clack (as relevant) in the opening position, fill the component with a hydraulic pressure of 2000 kPa, maintain the pressure for five minutes and proceed as follows:

a) All components: Inspect the body for compliance with the requirements of 7.2 (a).

b) Valves

i) without reducing the pressure close and open the valve and check the spindle for compliance with the requirements of 7.2 (b) (i)

ii) completely close the valve by hand and, without reducing the pressure, remove the blank from the outlet and check the seat for compliance with the requirements of 7.2 (b) (ii).

10.4 Burst test for above ground hydrant valves

10.4.1 Apparatus

10.4.1.1 A hydraulic pump capable of producing a static pressure of 5000 kPa.

10.4.1.2 A suitable pressure gauge.

10.4.1.3 An appropriately sized male component of the hose coupling that complies with the relevant requirements of SANS 1128: Part 2 and that is blanked off on its tail.

10.4.2 Procedure

Properly assemble the male component to the outlet of the valve under test and connect in the inlet to the pump. Fill the valve with water, ensuring that no air is occluded. Open the valve and increase the water pressure to 5000 kPa, and maintain this pressure for five minutes. Inspect the valve for compliance with the requirements of 6.5.

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Figure 1 - 70 mm underground screw down type hydrant valve

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Figure 2 – Gate Valve Outlet Bend

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Dimensions in mm

Figure 3 – Bayonet Type Outlet (see 6.1.3)

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Dimensions in mm

Figure 4 – Vee-Thread Outlet (see 6.1.3)

Dimensions in mm

Figure 5 – Round Thread Outlet (see 6.1.3)

Dimensions in mm

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Figure 6 – Portable Standpipe

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Dimensions in mm

Figure 7 – Basic Form of Round Thread

Dimensions in mm

Figure 8 – Outlet Connection/Coupling (see 6.1.4.3 and 6.2.2)

65 mm thread complying with SANS 1109

65 instantaneous connection conforming to the relevant requirements for connectors of BOS 305

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Figure 9 – Typical Outlet Connections for Above ground Hydrant Valve

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Dimensions in mm

Figure 10 – Sheathed Spindle

Figure 11 – Open Type Spindle

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Dimensions in mm

Figure 12 – Tamperproof Type Handle

Figure 13 – Hydrant outlet adaptor

65 mm instantaneous connection conforming to the relevant requirements for connectors of SANS 1128 Part II

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Annex A (Normative)

Notes to purchasers

The following requirements must be specified in tender invitations and in the order or contract:

a) The type(s) of major components required (see 4.1 and 4.2)

b) In the case of underground type components, and when and as relevant

i) the type of valve required and, when relevant, that it should open in a clockwise direction (see 6.1.1)

ii) whether fixed or loose flange is required (see 6.1.3)

iii) the type of outlet (see 6.1.3)

iv) the type of inlet connection on portable standpipes and, when relevant, the type of thread (see 6.1.4.1 and 6.1.4.2)

v) whether one or two outlet connections are required on portable standpipes (see 6.1.4.3)

c) In the case of aboveground type components, and when and as relevant

i) that the valve should open in an anticlockwise direction (see 6.2.1)

ii) the type of valve inlet (see 6.2.1.1.1)

iii) the type of valve outlet (see 6.2.1.1.3)

iv) the type of connection for the valve outlet (see 6.2.1.1.4)

v) whether the top of the spindle should be open or shielded (see 6.2.1.2)

vi) whether packing rings or “o” rings are required (see 6.2.1.4)

vii) the type of operating device (see 6.2.1.5)

viii) when relevant, the type of coupling outlet (see 6.2.2)

ix) the type of adapter inlet (see 6.2.3)

d) When relevant, that blank caps must be supplied (see 6.3.1)

e) When relevant, that the external surfaces of the aboveground hydrant valves must be polished (see 6.4)