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1、BRITISH STANDARD BS 750:1984 Incorporating Amendment Nos. 1, 2 and 3 and Corrigendum No. 1 Specification for underground fire hydrants and surface box frames and covers ICS 13.220.10 ? Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 10:48:07 GMT+00:00 2006, Unco
2、ntrolled Copy, (c) BSI BS 750:1984 This British Standard, having been prepared under the direction of the Fire Standards Committee, was published under the authority of the Board of BSI and comes into effect on 31 January 1984 BSI 24 August 2005 First published August 1937 First revision January 195
3、0 Second revision August 1964 Third revision February 1977 Fourth revision January 1984 ISBN 0 580 13552 7 Committees responsible for this British Standard The preparation of this British Standard was entrusted by the Fire Standards Committee (FSM/-) to Technical Committee FSM/8 upon which the follo
4、wing bodies were represented: British Fire Services Association British Plastics Federation British Valve Manufacturers Association Ltd. Chief and Assistant Chief Fire Officers Association Department of the Environment (Property Services Agency) Fire Extinguishing Trades Association Greater London C
5、ouncil Home Office Institution of Fire Engineers Ministry of Defence National Water Council Amendments issued since publication Amd. No.DateComments 7658June 1993 10434April 1999 145208 July 2004 15667 Corrigendum 24 August 2005 Correction to Amendment No. 1 affecting Clause 9, D.4.3.4, Figure 6 and
6、 Figure 7 Indicated by a sideline in the margin Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 10:48:07 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 750:1984 BSI 24 August 2005 i Contents Page Committees responsibleInside front cover Forewordii Section 1. Gene
7、ral 1Scope 1 Section 2. Fire hydrants 2Classification and design 3 3Wedge gate (type 1) 3 4Screw-down (type 2) 5 5General requirements 6 6Type requirements 8 7Production requirements 10 8Hydrostatic test certificate 10 9Marking 10 Section 3. Surface box frames and covers 10Grading 11 11Materials 11
8、12Manufacture, workmanship and coating 11 13Design features 12 14Marking 13 15Type requirements 14 16Production requirements 15 17Test certificate 15 Appendix A Information to be supplied by the purchaser 16 Appendix B Inspection of manufacture 16 Appendix C Type and production hydrostatic tests for
9、 screwed outlets 16 Appendix D Type tests for strength, security and endurance 17 Appendix E Type and production loading tests for surface box frames and covers 21 Figure 1 Example of fire hydrant wedge gate (type 1) showing required dimensions 4 Figure 2 Example of fire hydrant screw-down (type 2)
10、showing required dimensions 5 Figure 3 Screwed outlet (round thread) and outlet cap showing required dimensions 7 Figure 4 Minimum bedding width of surface box frame showing required dimensions 12 Figure 5 Detail of keyhole and key 14 Figure 6 Impact test apparatus 19 Figure 7 Load/deflection test a
11、pparatus 20 Table 1 Deleted Table 2 Deleted Table 3 Deleted Table 4 Deleted Table 5 Deleted Table 6 Deleted Table 7 Deleted Table 8 Deleted Table 9 Deleted Table 10 Production test load requirements and acceptance criteria 15 Publications referred to 23 Licensed Copy: London South Bank University, L
12、ondon South Bank University, Fri Dec 08 10:48:07 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 750:1984 ii BSI 24 August 2005 Foreword This British Standard has been prepared under the direction of the Fire Standards Committee and is a revision of BS 750:1977 which is withdrawn. In this revision the
13、 opportunity has been taken of introducing type tests for plastics screwed outlets and additional grades of metals for certain components. In addition spindle sealing for screw-down type hydrants is now specified. Flange requirements have also been revised. Surface box frames and covers with modifie
14、d test procedures are specified in greater detail in this edition. Appendix A and Appendix B do not contain requirements of this standard and are incorporated for guidance only. Appendix C, Appendix D and Appendix E do form part of the requirements of the standard. BS 5306-1 contains recommendations
15、 for the planning, installation, testing and maintenance of underground fire hydrants. It has been assumed in the drafting of this British Standard that the execution of its provisions is entrusted to appropriately qualified and experienced people, for whose guidance it has been prepared. This publi
16、cation does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cove
17、r, pages i and ii, pages 1 to 23 and a back cover. The BSI copyright notice displayed in this document indicates when the document was last issued. Sidelining in this document indicates the most recent changes by amendment. Licensed Copy: London South Bank University, London South Bank University, F
18、ri Dec 08 10:48:07 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 750:1984 BSI 24 August 2005 1 Section 1. General 1 Scope This British Standard specifies the operational and safety requirements for underground fire hydrants conforming to BS EN 1074-6. It includes hydrants with valves of the wedge ga
19、te type and the screw-down type suitable for a maximum allowable operating pressure (PFA) of 1.6 MPa1) and 2.5 MPa. It also specifies requirements for their surface box frames and covers. NOTE 1 The titles of the publications referred to in this standard are listed on page 23. NOTE 2 PFA is defined
20、in BS EN 805. 1)1 MPa = 10 bar. Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 10:48:07 GMT+00:00 2006, Uncontrolled Copy, (c) BSI 2 blank Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 10:48:07 GMT+00:00 2006, Uncontrolle
21、d Copy, (c) BSI BS 750:1984 BSI 24 August 2005 3 Section 2. Fire hydrants 2 Classification and design Hydrants shall have a design life of 50 years. This shall be determined by reference to the materials used in the construction, their properties, the engineering design of the hydrant, the normal si
22、tuation of installation and conditions of use. The manufacturer shall demonstrate compliance with this requirement by reference to the materials of construction being in accordance with standards contained herein. Where materials have time-dependent properties these shall be selected with reference
23、to the manufacturers data on such properties to determine their suitability for the function and lifespan. Where elements of the hydrant are designed to be serviceable, this shall not be regarded as reason to design for a shorter operating life. Serviceable components shall include those having pote
24、ntial for accidental damage and wear from abnormal use. The manufacturer shall ensure that parts that are considered to be subject to wear shall be available for the lifetime of the valve. Hydrants shall be one of the following two types: type 1 wedge gate (see Clause 3 and Figure 1); type 2 screw-d
25、own (see Clause 4 and Figure 2). Screw-down hydrants of type 2 shall conform to one of the following patterns. a) Type 2a: The bonnets and/or outlets of this pattern shall be secured in such a manner that they cannot be removed when installed in a pipeline. With the exception of stem sealings, it sh
26、all be made clear in the manufacturers literature that the hydrant cannot be maintained whilst in situ. b) Type 2b: Designed to facilitate maintenance of obturator, stem, outlet and their seals, in situ, whilst mounted in a chamber having a surface box frame and cover conforming to Section 3. They s
27、hall have: 1) Y and Z flanges DN 50, PN 16 or PN 25 compatible with the mating dimensions given in BS EN 1092-2 and BS EN 1092-3 as appropriate, and using bolts, studs or set screws specified (i.e. M16). They need not be circular and are not required to have raised faces. NOTE Y or Z flanges may hav
28、e a groove in the face to accommodate an “O” ring. The bolt holes may be slotted and the slots may extend to the periphery of the flange. 2) A bolted connection at the body/bonnet joint with a minimum of three bolts. c) Type 2c: Designed to facilitate maintenance as type 2b. They shall have bolted c
29、onnections between both the outlet and body and the bonnet and body. These connections shall each have a minimum of three bolts. d) Type 2d: Designed to facilitate maintenance as type 2b, but having means of connection of the outlet and/or bonnet to the hydrant body other than type 2c (see 5.2.4 and
30、 5.9). Type 2b, type 2c and type 2d hydrants shall be capable of being dismantled in situ using standard, readily available tools. 3 Wedge gate (type 1) 3.1 Hydrants of the wedge gate type shall conform to the dimensions shown in Figure 1. 3.2 The wedge gate valve shall conform to the recommendation
31、s and requirements of BS 5163-1, BS 5163-2, BS EN 1074-1 and BS EN 1074-2 for PN 16 or PN 25 valves (see also 5.4). 3.3 Materials for duckfoot bends shall conform to BS EN 545. Table 1 Deleted Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 10:48:07 GMT+00:00 20
32、06, Uncontrolled Copy, (c) BSI BS 750:1984 4 BSI 24 August 2005 Section 2 All dimensions are in millimetres Key 1Stem cap4Wedge gate valve 2Outlet cap (for details see Figure 3)565 nominal bore 3Outlet (for details see Figure 3)6Duckfoot bend Figure 1 Example of fire hydrant wedge gate (type 1) show
33、ing required dimensions 2 3 4 6 DN 80 1 5 300 XXX Y Z Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 10:48:07 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 750:1984 BSI 24 August 2005 5 Section 2 4 Screw-down (type 2) 4.1 Hydrants of the screw-down type shall c
34、onform to the dimensions shown in Figure 2. The clearance between the back of flange X and the body shall be not less than 17 mm at the position of any bolt hole. 4.2 Materials for the bodies of screw-down type hydrants shall conform to BS EN 1503-3. Table 2 Deleted 4.3 Hydrants shall be fitted with
35、 either captive or loose valves, which shall be faced with a resilient material in accordance with BS EN 681-1 type WA (for cold potable water). Table 3 Deleted All dimensions are in millimetres Key 1Stem cap3Outlet (for details see Figure 3) 2Outlet cap (for details see Figure 3)465 nominal bore Fi
36、gure 2 Example of fire hydrant screw-down (type 2) showing required dimensions 2 DN 80 1 Y 100 3 4 Z X Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 10:48:07 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 750:1984 6 BSI 24 August 2005 Section 2 4.4 For screw-do
37、wn type hydrants, copper alloy materials for the body seatings, if fitted, and for the threaded part of the valve which engages with the stem shall conform to BS EN 1982. NOTE 1 It is not essential for a body seating to be fitted to ensure a good seal. Polymeric coatings may be used instead provided
38、 that the performance requirements of Clauses 6 and 7. NOTE 2 For the threaded part of the valve, copper alloy materials normally used are gunmetal, high-tensile brass, aluminium bronze and die-cast brass. Table 4 Deleted 4.5 Stems of screw-down type hydrants shall be manufactured from either: a) co
39、pper alloys conforming to BS EN 1982; or b) stainless steel conforming to BS EN 10088-1 with a minimum chromium content of 13 %. 4.6 Stem sealings shall be of one of the following three types: a) stuffing box and gland type; b) toroidal sealing ring (“O” ring) type; c) other pressure actuated types
40、of seal. The valve shall be capable of stem seal changing while the valve is under pressure and fully closed. Where stem sealing is of the toroidal sealing ring (“O” ring) type then two such seals shall be used. Table 5 Deleted Where stem sealing is of the toroidal sealing ring (“O” ring) type or ot
41、her pressure actuated type then a wiper ring shall be positioned above the seals to prevent the ingress of foreign matter. 4.7 Deleted 5 General requirements 5.1 Inlet flanges The mating dimensions of flange X shown in Figure 1 and Figure 2 shall be in accordance with BS EN 1092-2, DN 80 and PN 16 o
42、r PN 25. NOTE It need not be circular or full form and may be provided with additional holes, which may be slotted, to suit other flange designs. 5.2 Screwed outlets 5.2.1 The screwed outlet shall be manufactured from either copper alloy conforming to BS EN 1982 or plastics and shall conform to 6.4
43、and 6.5. The outlet shall conform to the dimensions shown in Figure 3. The screwed outlet shall be provided with a cap to cover the outlet thread (see Figure 3). It shall be securely attached to the hydrant by a chain or other flexible device. Table 6 Deleted 5.2.2 The screwed outlet shall be provid
44、ed with a cap to cover the outlet thread (see Figure 3). It shall be securely attached to the hydrant by a chain or other flexible device. 5.2.3 The design of hydrant and outlet shall permit full engagement onto the outlet of a standpipe conforming to BS 336:1989, Figure 12. 5.2.4 Outlets connected
45、by means other than that described for type 2b and type 2c shall be secured by two independent and functionally different means. These different means shall each be capable of preventing the outlet becoming unintentionally detached in the absence of the other. Outlets connected by means other than t
46、hat described for type 2b and type 2c shall conform to the type requirements in Clause 6 with: both security systems in place; only one of the security systems in place; only the other security system in place. Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 10:
47、48:07 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 750:1984 BSI 24 August 2005 7 Section 2 All dimensions are in millimetres Key 1Outlet cap5 Outlet to be screwed with round thread, two threads per 25.4 mm crest diameter 82.2mm, root diameter k68 mm 2Cap not to be threaded 3Feather edge to be remov
48、edt Thickness of thread 5.7mm 4Taper (see Note 2) NOTE 1 The details of female round threads for stand-pipes are given in BS 336. NOTE 2 Deviations from a uniform taper are permitted. Figure 3 Screwed outlet (round thread) and outlet cap showing required dimensions 2 1 3 4 40 5 30 70 65 54 0.8 R 2.8
49、5 R 3.5 7.2 t 2 t.p.i 12.7 0 0.4 0 0.4 Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 10:48:07 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 750:1984 8 BSI 24 August 2005 Section 2 5.3 Deleted Table 7 Deleted 5.4 Stem caps 5.4.1 The stem shall be provided with a cast iron cap conforming to BS 5163-2. The cap shall be securely fixed to the stem so that it remains fixed in position during
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