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1、BS 750:2006 Specification for underground fire hydrants and surface box frames and covers ICS 13.220.10 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW BRITISH STANDARD Incorporating Amendment No. 1 Licensed Copy: London South Bank University, London South Bank University, Fri
2、 Nov 16 07:23:16 GMT+00:00 2007, Uncontrolled Copy, (c) BSI Publishing and copyright information The BSI copyright notice displayed in this document indicates when the document was last issued. BSI 2007 ISBN 978 0 580 59134 1 The following BSI references relate to the work on this standard: Committe
3、e reference FSH/17 Draft for comment 06/40142029 DC Publication history First published August 1937 First revision January 1950 Second revision August 1964 Third revision February 1977 Fourth revision January 1984 Fifth revision September 2006 Amendments issued since publication Amd. no.DateText aff
4、ected Amendment No. 131 October 2007See foreword BS 750:2006 Licensed Copy: London South Bank University, London South Bank University, Fri Nov 16 07:23:16 GMT+00:00 2007, Uncontrolled Copy, (c) BSI BSI 2007i BS 750:2006 Contents Foreword ii Section 1: General 1 1Scope 1 2Normative references 1 Sect
5、ion 2: Fire hydrants 3 3General requirements 3 4Wedge-gate (type 1) 3 5Screw-down (type 2) 5 6Outlets 8 7Stem drive 10 8Draining system 10 9Coating 10 10Maintenance of water purity (potable water systems only) 10 11Type requirements 11 12Hydrant assembly Resistance to internal pressure of the shell
6、and of all pressure containing components and resistance of the obturator to differential pressure 12 13Hydrostatic test certificate 13 14Marking and additional data 13 Section 3: Surface box frames and covers 14 15Grading 14 16Materials 14 17Manufacture, workmanship and coating 14 18Design features
7、 15 19Marking 17 20Type requirements 18 21Production requirements 19 22Test certificate 19 Annexes Annex A (normative) Type tests for strength, security and endurance 20 Annex B (normative) Type hydrostatic tests for screwed outlets 22 Annex C (informative) Information to be supplied by the purchase
8、r 23 Annex D (normative) Type and production loading tests for surface box frames and covers 24 Bibliography 25 List of figures Figure 1 Example of wedge-gate (type 1) fire hydrant showing required dimensions 4 Figure 2 Example of screw-down (type 2) fire hydrant showing required dimensions 6 Figure
9、 3 Screwed outlet (round thread) and outlet cap showing required dimensions 9 Figure 4 Minimum bedding width of surface box frame showing required dimensions 17 Figure 5 Detail of keyhole and key 18 Figure A.1 Load/deflection test apparatus 22 List of tables Table 1 Production test load requirements
10、 and acceptance criteria 19 Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, pages 1 to 25 and a back cover. Licensed Copy: London South Bank University, London South Bank University, Fri Nov 16 07:23:16 GMT+00:00 2007, Uncontrolled Copy, (c) BSI BS 750:
11、2006 ii BSI 2007 Foreword This British Standard was published by BSI and came into effect on 29 September 2006. It was prepared by Subcommittee FSH/17/1, Hydrants, hydrant systems, couplings and indicator plates, under the authority of Technical Committee FSH/17, Fire brigade equipment. A list of or
12、ganizations represented on this committee can be obtained on request to its secretary. Supersession This British Standard supersedes BS 750:1984, which is withdrawn. Information about this document This British Standard has been revised as a result of the publication of BS EN 14339 and BS EN 1074-6
13、and includes specific national requirements that are not specified in BS EN 14339 and BS EN 1074-6. Additionally, as a result of a number of safety events involving hydrants with outlets manufactured from nylon/plastics that were introduced in the 1984 version, such materials have been removed from
14、this standard until such time as appropriate tests may be developed that reflect the in-service performance of these materials. 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
15、guidance it has been prepared. Presentational conventions The provisions of this standard are presented in roman (i.e. upright) type. Its requirements are expressed in sentences in which the principal auxiliary verb is “shall”. Commentary, explanation and general informative material is presented in
16、 smaller italic type, and does not constitute a normative element. The start and finish of text introduced or altered by Amendment No. 1 is indicated in the text by tags !“. Minor editorial changes are not tagged. Contractual and legal considerations This publication does not purport to include all
17、the necessary provisions of a contract. Users are responsible for its correct application. Compliance with a British Standard cannot confer immunity from legal obligations. Licensed Copy: London South Bank University, London South Bank University, Fri Nov 16 07:23:16 GMT+00:00 2007, Uncontrolled Cop
18、y, (c) BSI 1 BS 750:2006 Section 1: General 1 Scope This British Standard specifies the national operational and health and safety requirements for underground fire hydrants conforming to BS EN 14339 and BS EN 1074-6. It also includes specific national requirements not included in BS EN 14339 and BS
19、 EN 1074-6. This British Standard is applicable to underground fire hydrants: a)to be installed in a water distribution system; b)in size DN 80; c)suitable for a maximum allowable operating pressure (PFA) of 1.6 MPa or 2.5 MPa (16 bar or 25 bar); d)with valves of the wedge-gate type or the screw-dow
20、n type; and e)with one outlet. It also specifies requirements for their surface box frames and covers. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the l
21、atest edition of the referenced document (including any amendments) applies. BS 336:1989, Specification for fire hose couplings and ancillary equipment BS 1610, Methods for the load verification of testing machine BS 3416, Specification for bitumen-based coatings for cold application, suitable for u
22、se in contact with potable water BS 4147, Specification for bitumen-based hot-applied coating materials for protecting iron and steel, including suitable primers where required BS 4164, Specification for coal-tar-based hot-applied coating materials for protecting iron and steel, including a suitable
23、 primer BS 5163-1, Valves for waterworks purposes Part 1: Predominantly key-operated cast iron gate valves Code of practice BS 5163-2, Valves for waterworks purposes Part 2: Stem caps for use on isolating valves and associated water control apparatus Specification BS 6001 (all parts), Sampling proce
24、dures for inspection by attributes BS 6920-1, Suitability of non-metallic products for use in contact with water intended for human consumption with regard to their effect on the quality of the water Part 1: Specification BSI 2007 Licensed Copy: London South Bank University, London South Bank Univer
25、sity, Fri Nov 16 07:23:16 GMT+00:00 2007, Uncontrolled Copy, (c) BSI BS 750:2006 2 BS EN 1074-1, Valves for water supply Fitness for purpose requirements and appropriate verification tests Part 1: General requirements BS EN 1074-2, Valves for water supply Fitness for purpose requirements and appropr
26、iate verification tests Part 2: Isolating valves BS EN 1074-6:2004, Valves for water supply Fitness for purpose requirements and appropriate verification tests Part 6: Hydrants BS EN 1092-2, Flanges and their joints Circular flanges for pipes, valves, fittings and accessories, PN designated Part 2:
27、Cast iron flanges BS EN 1092-3, Flanges and their joints Circular flanges for pipes, valves, fittings and accessories, PN designated Part 3: Copper alloy flanges BS EN 1561, Founding Grey cast irons BS EN 1563, Founding Spheroidal graphite cast iron BS EN 1982, Copper and copper alloys Ingots and ca
28、stings BS EN 10088-1, Stainless steels Part 1: List of stainless steels BS EN 12163, Copper and copper alloys Rod for general purposes BS EN 12164, Copper and copper alloys Rod for free machining purposes BS EN 12165, Copper and copper alloys Wrought and unwrought forging stock BS EN 12167, Copper a
29、nd copper alloys Profiles and rectangular bar for general purposes BS EN 12168, Copper and copper alloys Hollow rod for free machining purposes BS EN 14339:2005, Underground fire hydrants WIS 04-52-01, Specification for polymeric anti-corrosion (barrier) coatings (as amended) (ISBN 0267-0305)1) WIS
30、04-52-02, The use of polymeric anti-corrosion (barrier) coatings (ISBN 0267-0305)1) WIS 04-52-03, Specification for anti-corrosion coatings on threaded fasteners (as amended)1) 1) WRc plc, Swindon. http:/ BSI 2007 Licensed Copy: London South Bank University, London South Bank University, Fri Nov 16
31、07:23:16 GMT+00:00 2007, Uncontrolled Copy, (c) BSI 3 BS 750:2006 Section 2: Fire hydrants 3 General requirements 3.1 As a minimum, hydrants conforming to this British Standard shall conform to BS EN 14339. 3.2 Hydrants shall have a design life of a minimum of 50 years. This shall be determined by r
32、eference to: a)the materials used in the construction and their properties; b)the engineering design of the hydrant; c)the normal situation of installation; and d)the conditions of use. 3.3 Where materials have time-dependent properties, these shall be selected with reference to the manufacturers da
33、ta on such properties to determine their suitability for the function and life span. 3.4 Where elements of the hydrant are designed to be serviceable, this shall not be regarded as reason to design for a shorter operating life. 3.5 Serviceable components shall include those having potential for acci
34、dental damage and wear from abnormal use. 3.6 The manufacturer shall ensure that parts that are considered to be subject to wear shall be available for the lifetime of the valve. 3.7 Hydrants shall be one of the following two types: a)a) type 1 wedge-gate (see Clause 4 and Figure 1); b)b) type 2 scr
35、ew-down (see Clause 5 and Figure 2). 4 Wedge-gate (type 1) 4.1 Hydrants of the wedge-gate type shall conform to the dimensions shown in Figure 1. 4.2 The wedge-gate valve shall conform to the recommendations and requirements of BS EN 1074-1, BS EN 1074-2, BS 5163-1 and BS 5163-2 for PN 16 or PN 25 v
36、alves. 4.3 Materials for duck-foot bends shall conform to BS EN 1561 or BS EN 1563. 4.4 Y and Z flanges DN 50, PN 16 or PN 25 shall be compatible with the mating dimensions given in BS EN 1092-2 and BS EN 1092-3 as appropriate, and use the bolts, studs or set screws specified. They need not be circu
37、lar and are not required to have raised faces. NOTEY or Z flanges may have 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. BSI 2007 Licensed Copy: London South Bank University, London South Bank University, Fri N
38、ov 16 07:23:16 GMT+00:00 2007, Uncontrolled Copy, (c) BSI BS 750:2006 4 Figure 1Example of wedge-gate (type 1) fire hydrant showing required dimensions All dimensions are in millimetres Key 1 Stem cap4 Wedge-gate valve 2 Outlet cap5 65 nominal bore 3 Outlet (for details see Figure 3)6 Duck-foot bend
39、 X, Y, Z flange 2 3 4 6 DN 80 1 5 300 XXX Y Z BSI 2007 Licensed Copy: London South Bank University, London South Bank University, Fri Nov 16 07:23:16 GMT+00:00 2007, Uncontrolled Copy, (c) BSI 5 BS 750:2006 5 Screw-down (type 2) 5.1Classification Screw-down hydrants of type 2 shall conform to one of
40、 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 shall be made clear in the manufacturers literature that the hydrant cannot be maintained
41、 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 shall have: i)Y and Z flanges DN 50, PN 16 or PN 25, compatible with the mating dimension
42、s given in BS EN 1092-2 and BS EN 1092-3 as appropriate, and using bolts, studs or set screws specified. They need not be circular and are not required to have raised faces. NOTEY or Z flanges may have a groove in the face to accommodate an “O” ring. The bolt holes may be slotted and the slots may e
43、xtend to the periphery of the flange. ii)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 connections between both the outlet and body and the bonnet and body. These connections shall each hav
44、e 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 6.3, 6.4, and 5.5). Type 2b, type 2c and type 2d hydrants shall be capable of being dismantled in situ using st
45、andard, readily available tools. 5.2Dimensions 5.2.1 Hydrants of the screw-down type shall conform to the dimensions shown in Figure 2. 5.2.2 The clearance between the back of flange X (where used) and the body shall be not less than 17 mm at the position of any bolt hole. 5.2.3 The mating dimension
46、s of flange X (where used) shown in Figure 2 shall be in accordance with BS EN 1092-2, DN 80 and PN 16 or PN 25. NOTEIt need not be circular or full form and may be provided with additional holes, which may be slotted, to suit other flange designs. BSI 2007 Licensed Copy: London South Bank Universit
47、y, London South Bank University, Fri Nov 16 07:23:16 GMT+00:00 2007, Uncontrolled Copy, (c) BSI BS 750:2006 6 Figure 2Example of screw-down (type 2) fire hydrant showing required dimensions All dimensions are in millimetres Key 1 Stem cap3 Outlet (for details see Figure 3) 2 Outlet cap4 65 nominal b
48、ore X, Y, Z flange 2 DN 80 1 Y 100 3 4 Z X BSI 2007 Licensed Copy: London South Bank University, London South Bank University, Fri Nov 16 07:23:16 GMT+00:00 2007, Uncontrolled Copy, (c) BSI BSI 20077 BS 750:2006 5.3Materials 5.3.1 All copper alloy materials used in the construction of hydrants shall
49、 conform to BS EN 1982, BS EN 12163, BS EN 12164, BS EN 12165, BS EN 12167 or BS EN 12168. 5.3.2 The threaded part of the valve which engages with the stem shall be a copper alloy. 5.3.3 Stems of screw-down type hydrants shall be manufactured from stainless steel conforming to BS EN 10088-1 with a minimum chromium content of 13% or copper alloy (see 5.3.1). ! 5.3.4 Stainless steel outlets shall be manufactured from grades conforming t
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