1、BRITISH STANDARD BS5041-2: 1987 Incorporating Amendment No.1 Fire hydrant systems equipment Part 2: Specification for landing valves for dry risers UDC 614.843.1+621.643.51BS5041-2:1987 This British Standard, having been prepared under the directionof the Fire Standards Committee, was published unde
2、rthe authority of the BoardofBSI and comes into effect on 31 March1987 BSI 07-1999 First published February 1976 First revision March 1987 The following BSI references relate to the work on this standard: Committee reference FSM/6 Draft for comment86/35863 DC ISBN 0 580 15722 9 Committees responsibl
3、e for this British Standard The preparation of this British Standard was entrusted by the Fire Standards Committee (FSM/-) to Technical Committee FSM/6, upon which the following bodies were represented: Association of County Councils Association of Metropolitan Authorities British Coal British Fire
4、Services Association British Plastics Federation British Valve Manufacturers Association Ltd. Chief and Assistant Chief Fire Officers Association Convention of Scottish Local Authorities Copper Development Association Department of the Environment (Property Services Agency) Department of Transport (
5、Marine Directorate) Fire Extinguishing Trades Association Fire Offices Committee Fire Protection Association Greater London Council Home Office Institution of Fire Engineers Ministry of Defence Royal Institute of British Architects The following body was also represented in the drafting of the stand
6、ard, through subcommittees and panels: British Fire Protection Systems Association Ltd. Amendments issued since publication Amd. No. Date of issue Comments 5776 July 1988 Indicated by a sideline in the marginBS5041-2:1987 BSI 07-1999 i Contents Page Committees responsible Inside front cover Foreword
7、 ii Section 1. General 1 Scope 1 2 Definitions 1 3 Pressure rating 1 4 Nominal inlet sizes 1 5 Temperature rating 1 6 Marking 1 Section 2. Design 7 Materials 2 8 Valve bodies 2 9 Valve inlets 2 10 Valve outlets 3 11 Bonnets 3 12 Wedge gates 3 13 Stems 3 14 Stem sealing 3 15 Glands 3 16 Handwheels an
8、d operation 3 17 Bolting 4 18 Pressure retention 4 19 Strap 4 20 Blank cap and chain 4 Section 3. Production testing requirements and test certificate 21 Hydrostatic test requirements 5 22 Test certificate 5 Appendix A Hydrostatic test methods 6 Appendix B Recommendations for the information to be s
9、uppliedbythepurchaser to the manufacturer 6 Table 1 Choice of materials for components and parts 2 Table 2 Bolting for valves 4 Publications referred to Inside back coverBS5041-2:1987 ii BSI 07-1999 Foreword This revision of BS5041-2 has been prepared under the direction of the Fire Standards Commit
10、tee and supersedes BS5041-2:1976, which is withdrawn. It specifies requirements for copper alloy gate valves for use on dry risers, tests and marking. The subjects of the other Parts in the BS5041 series of general specifications for fire hydrant systems equipment are as follows. Part 1: Landing val
11、ves for wet risers; Part 3: Inlet breechings for dry riser inlets; Part 4: Boxes for landing valves for dry risers; Part 5: Boxes for foam inlets and dry riser inlets. These Parts give detailed requirements for most of the other special items required for wet and dry risers described in BS5306-1. A
12、full bore valve, as specified in this Part, is needed in dry risers to ensure minimum resistance to water flow, and stem diameters have been specified to ensure reliability. In this standard metric values are given in SI units; for further information reference should be made to BS3763. Some nominal
13、 bores and thread sizes are given in inches to accord with the standards referred to. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of it
14、self confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pagesiandii, pages1to6, an inside back cover and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indica
15、ted in the amendment table on the inside front cover.BS5041-2:1987 BSI 07-1999 1 Section 1. General 1 Scope This Part of BS5041 specifies requirements for copper alloy gate valves generally complying with BS5154, suitable for installation as landing valves on dry risers. The valves have screwed or f
16、langed inlets and also delivery hose connections complying with BS336. The standard covers valves of nominal pressure (PN) designation15 bar and nominal inlet size DN65 for flanged ends and2 for screwed ends. NOTE 1Unless otherwise stated all pressures are gaugepressures expressed in bar:1 bar=10 5N
17、/m 2 =100 kPa. NOTE 2Information which the purchaser is recommended to supply to the manufacturer is given in Appendix B and does not form part of the specification. NOTE 3The titles of the publications referred to in this standard are listed on the inside back cover. 2 Definitions For the purposes
18、of this Part of BS5401, the following definitions apply. 2.1 dry riser (dry rising main) a vertical pipe installed in a building for fire fighting purposes, fitted with inlet connections at fire service access level and outlet connections at specified points, which is normally dry but capable of bei
19、ng charged with water by pumping from fire service appliances 2.2 landing valve an assembly comprising a valve and outlet connection from a wet or dry riser 3 Pressure rating Valves shall be suitable for use at nominal inlet pressures up to15bar. 4 Nominal inlet sizes 4.1 Flanged end valves The nomi
20、nal inlet size (DN) shall be65. 4.2 Screwed end valves The nominal inlet size (DN) shall be2. 5 Temperature rating Valves shall be suitable for continuous use at the nominal pressure rating (seeclause3) throughout the temperature range from0C to38C. 6 Marking Each valve shall be marked with the foll
21、owing: a) the nominal size; b) the manufacturers name or trademark; c) the number of this standard, i.e.BS5041-2 1) . 1) Marking BS5041-2 on or in relation to a product is a claim by the manufacturer that the product has been manufactured to the requirements of the standard. The accuracy of such a c
22、laim is therefore solely the manufacturers responsibility. Enquiries as to the availability of third party certification should be addressed to the appropriate certification body.BS5041-2:1987 2 BSI 07-1999 Section 2. Design 7 Materials Each component or part of the valve shall be made from one of t
23、he materials given in Table 1. 8 Valve bodies 8.1 Flow-way dimensions The body inlet port and the seat bore shall be circular and have a diameter of not less than63.5mm. 8.2 Body wall thickness The body wall thickness at any point shall be not less than2.8mm and the distance from the back face or fl
24、ange face to the extremity of the chain retaining lug on the blank cap shall be not more than300mm, with the blank cap fitted to the outlet. 8.3 Body seat The body seat shall be either integral with the body or inserted in the form of a securely fitted but renewable ring. 8.4 Seating face The seatin
25、g face shall be not less than3mm wide. 9 Valve inlets 9.1 General Valve inletsshall be either flanged (see9.2) or screwed (see9.3). 9.2 Flanged ends 9.2.1 The inlet flange shall be in accordance with Table 16/21 of BS4504-2:1974, with the possible exception of drilling (see 9.2.2). The casting surro
26、unding the bolt holes on the flange shall be cast smooth and level or machined or spot faced to ensure satisfactory bolting. Holes shall be equally spaced on the pitch circle diameter and shall be drilled “off centres”. If a flange is fitted with an “O” ring seal then the seal shall comply with BS18
27、06 or BS4518. Table 1 Choice of materials for components and parts Component Material British Standard number Grade of designation Body Copper alloy 1400 LG2 or LG4 Bonnet Copper alloy 1400 2872 LG2 or LG4 CZ114 or CZ122 Stem Copper alloy 2874 CZ112,CZ113,CZ114 or CZ121 Wedge Copper alloy 1400 2872
28、LG2 or LG4 CZ114 or CZ122 Outlet Copper alloy 1400 LG2 or LG4 Handwheel Copper alloy Malleable cast iron Grey cast iron Spheroidal graphite cast iron Aluminium alloy a 1400 2872 6681 1452 2789 1490 LG2 or LG4 CZ114 or CZ122 150 or180 LM6 or LM25 Blank cap Copper alloy Aluminium alloy a 1400 2872 149
29、0 LG2 CZ114 or CZ122 LM5 condition M LM6 condition M LM16 condition TF LM25 condition TB or TF Bolting Carbon steel b , tensile strength not less than390N/mm 2 1506 162 a The surface shall have an anodized finish of thickness not less than grade AA15 ofBS1615:1987, and the anodic oxidation coating s
30、hall be sealed (see clause7 of that standard). b Free cutting steels shall not be used.BS5041-2:1987 BSI 07-1999 3 9.2.2 If the purchaser does not specify drilling requirements for the flanges, they shall be drilled in accordance with Table 16/21 of BS 4504-2:1974. 9.3 Screwed ends 9.3.1 Body ends s
31、hall be hexagonal or of shape suitable for a hook or “C” spanner to facilitate tightening. 9.3.2 Screwed ends shall have male or female threads of nominal size 2 complying with BS 21. 9.3.3 The thickness of male ends shall be not less than3mm from the root diameter of the thread to the bore of the i
32、nlets. 10 Valve outlets Outlet end connections shall be either integral or screwed on, and shall be of female instantaneous pattern complying with BS336. 11 Bonnets 11.1 General The bonnet to body connection shall be screwed or union or bolted. The surfaces forming the body and bonnet joint shall be
33、 machined. The joint may be metal to metal, or made with a gasket, or “O” ring of non-shrinking material and complying with BS1806 or BS4518. 11.2 Bonnet wall thickness The bonnet wall thickness at any point shall be not less than2.8mm. 12 Wedge gates 12.1 General Wedges shall be solid and shall be
34、guided to ensure proper operation of the valve. Guides shall be smooth and true. NOTESplit wedges are more susceptible to damage by frost or the presence of foreign matter. 12.2 Gate faces Seating of gate faces shall be finished smooth without sharp edges and shall be not less than4.8mm wide. 12.3 W
35、edge clearance Wedges shall be clear of the seat bore when fully raised. NOTEWhen the valve is closed, the wedge should rise high in the body seats to allow for wear, and the seating surface of the wedge shall not touch the body surface until near the point of closure. 13 Stems 13.1 General Valves s
36、hall be of the non-rising stem type, having the actuating thread within the wedge. They shall be formed in one piece, and shall be of sufficient length to ensure a minimum clearance of40mm between the handwheel and any part of the valve vertically below the periphery of the handwheel and between the
37、 handwheel and the plunger release lug on the outlet. 13.2 Stem sizes The diameter of the stem shall be not less than16mm where the stem is made from CZ114, or19mm where the stem is made from any other copper alloy (see Table 1). The size of any square or drive on the stem shall be not less than12mm
38、 across flats. Where the handwheel is attached to the stem using a pin, the minimum cross-sectional dimension at that point shall be not less than 14.5mm. 13.3 Threads on stems The actuating thread shall be either Acme form or “V” form. The major diameter of the thread shall be not less than16min. 1
39、3.4 Retention of stem Means shall be provided to prevent the stem becoming detached from the wedge. 14 Stem sealing Valves shall be provided with one of the following means of sealing the stem: a) an “O” ring complying with BS1806 or BS4518; or b) a rubber gland seal; or c) a stuffing box gland. NOT
40、ERepacking under pressure. Valves for wet risers (seeBS5041-1 are required to have provision for the replacement of seals and the repacking of glands when under pressure. It is not considered necessary that valves for dry risers have provision to enable them to be repacked under pressure. 15 Glands
41、Glands shall be either screwed or bolted. Screwed glands shall consist of a gland and gland nut when used as a stuffing box. Bolted glands shall be either a solid type or a two-piece self-aligning type. 16 Handwheels and operation The valve shall be closed by turning the handwheel in a clockwise dir
42、ection when facing the handwheel. The number of complete turns of the handwheel to fully open a completely closed valve shall be not less than four nor more than10.BS5041-2:1987 4 BSI 07-1999 Handwheels shall be marked with the SHUT direction. Handwheels shall have a diameter of not less than100mm.
43、17 Bolting Bolting shall be in accordance with the standards given in Table 2. Table 2 Bolting for valves 18 Pressure retention 18.1 Body test A valve shall show no sign of leakage or distortion when tested in accordance withA.1 (see also21.1). 18.2 Seat test A valve shall show no sign of leakage or
44、 distortion when tested in accordance withA.2 (see also21.2). 19 Strap The valve shall be provided with a means for attaching a strap, so that the handwheel can be secured to counter unauthorized use. NOTEIf specified by the purchaser the following should also be provided (see BS5306-1): a) a strap
45、made of leather or reinforced plastics material not less than 12mm wide or less than2mm thick, and with ends suitable for linking by a padlock; b) a small non-ferrous padlock to secure the two ends of the strap. The provision of a strap is not usually considered necessary where the valve is to be en
46、closed in a box. 20 Blank cap and chain A blank cap complying with BS336 shall be provided. The cap shall be provided with a pressure relief hole having a flow area of not less than2mm 2 . The blank cap shall be attached to the body by a suitable lug, “S” hook and chain. Metric Inch BS3692 BS4190 BS
47、4439 BS4882 BS1769 BS2693-1 BS4882BS5041-2:1987 BSI 07-1999 5 Section 3. Production testing requirements and test certificate 21 Hydrostatic test requirements 21.1 Body test Each valve shall be tested in accordance withA.1 and shall comply with 18.1. 21.2 Seat test Each valve shall be tested in acco
48、rdance withA.2 and shall comply with 18.2. 22 Test certificate If the purchaser has requested a test certificate, the manufacturer shall supply one to certify that the valves in question have been tested and have satisfactorily complied with clause21. It shall also state the medium used in each test
49、.BS5041-2:1987 6 BSI 07-1999 Appendix A Hydrostatic test methods (see clauses18 and21) WARNING NOTE. Where hydrostatic testing is involved, safety precautions in accordance with the relevant parts of the Health and Safety Executive Guidance Note “General Series/4” should be taken. A.1 Body test Blank off the outlet of the valve and with the valve in the open or partly open position connect the inlet to a hydrostatic pressure test rig. Vent any trapped air. Subject the valve body to a hydrostatic test pressure of 22.5 bar for2min. Apply the test
