1、BRITISH STANDARD BS 5041-1: 1987 Incorporating Amendment No.1 Fire hydrant systems equipment Part 1: Specification for landing valves for wet risers UDC 614.843.1 + 621.643.51BS5041-1:1987 This British Standard, having been prepared under the directionof the Fire Standards Committee, was published u
2、nderthe authority of the BoardofBSI and comes intoeffecton 31 March 1987 BSI 03-1999 First published September 1975 First revision March 1987 The following BSI references relate to the work on this standard: Committee reference FSM/6 Draft for comment 86/35835 DC ISBN 0 580 15721 0 Committees respon
3、sible 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 F
4、ire 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 Transpo
5、rt (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 s
6、tandard, through subcommittees and panels: British Fire Protection Systems Association Ltd. Amendments issued since publication Amd. No. Date of issue Comments 5912 September 1988 Indicated by a sideline in the marginBS5041-1:1987 BSI 03-1999 i Contents Page Committees responsible Inside front cover
7、 Foreword ii Section 1. General 1 Scope 1 2 Definitions 1 3 Valve types 1 4 Classification by pressure rating 1 5 Nominal inlet sizes 2 6 Temperature rating 2 7 Marking 2 Section 2. Design 8 Materials 3 9 Valve bodies 3 10 Valve inlets 3 11 Valve outlets 3 12 Bonnets 3 13 Stems 3 14 Stem sealing on
8、globe valves 5 15 Glands on globe valves 5 16 Disks and disk facings 5 17 Handwheels and operation 5 18 Bolting 5 19 Pressure retention 5 20 Strap 5 21 Blank cap and chain 5 22 Water flow rate and outlet pressure 5 23 Outlet pressure at restricted pressure (high pressure valves only) 6 24 Resistance
9、 to high temperature (diaphragm valves only) 6 Section 3. Production testing requirements and test certificate 25 Hydrostatic tests 7 26 Pressure control test (high pressure valves only) 7 27 Test certificate 7 Appendix A Test methods 8 Appendix B Recommendations for the information to be supplied b
10、y thepurchaser to the manufacturer 9 Figure 1 Valve types 1 Table 1 Choice of materials for components and parts 4 Table 2 Bolting for valves 5 Table 3 Body test pressures and durations 8 Table 4 Seat test pressures and durations 8 Publications referred to Inside back coverBS5041-1:1987 ii BSI 03-19
11、99 Foreword This revision of BS5041-1 has been prepared under the direction of the Fire Standards Committee and supersedes BS5041-1:1975, which is withdrawn. It specifies requirements for valves suitable for use on wet risers of either high or low pressure installations. BS5041-1:1975 was restricted
12、 to copper alloy globe valves but in this revision requirements for diaphragm valves are included. The subjects of the other Parts in the BS5041 series of general specifications for fire hydrant systems equipment are as follows. Part 2: Landing valves for dry risers; Part 3: Inlet breechings for dry
13、 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. In this standard metric values are given in SI units;
14、for further information reference should be made to BS3763. Some nominal 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 thei
15、r 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 cover, pages i and ii, pages1 to10, an inside back cover and a back cover. This standard has been updated (see
16、copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on theinside front cover.BS5041-1:1987 BSI 03-1999 1 Section 1. General 1 Scope This Part of BS5041 specifies requirements for copper alloy globe valves generally complying with BS5154 and diaphra
17、gm valves generally complying with BS5156, both suitable for installation as landing valves on wet risers. The valves have screwed or flanged inlets and also delivery hose connections complying with BS336. This standard covers valves of nominal pressure (PN) designations15bar and 20bar and nominal i
18、nlet sizes DN40 to DN65 for flanged ends and 1 and2 for screwed ends. NOTE 1Unless otherwise stated all pressures are gauge pressures expressed in bar: 1bar = 10 5N/m 2= 100kPa. NOTE 2Information which the purchaser is recommended to supply to the manufacturer is given in Appendix B and does not for
19、m 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 of this Part of BS5041, the following definitions apply. 2.1 wet riser (wet rising main) a vertical pipe installed in a building for fire
20、 fighting purposes, permanently charged with water from a pressurized supply, and fitted with valves and outlet connections at specified points 2.2 landing valve an assembly comprising a valve and outlet connection from a wet or dry riser 3 Valve types Valves, whether globe or diaphragm, shall be of
21、 the horizontal, bib-nosed, oblique or right-angle type, the general forms being illustrated in Figure 1. 4 Classification by pressure rating 4.1 General Valves shall be classified as low pressure or high pressure according to the nominal inlet working pressure for which they are suitable. 4.2 Low p
22、ressure valves Low pressure valves shall be suitable for use at nominal inlet pressures up to 15bar. 4.3 High pressure valves High pressure valves shall be suitable for use at nominal inlet pressures up to 20bar. Figure 1 Valve typesBS5041-1:1987 2 BSI 03-1999 5 Nominal inlet sizes 5.1 Flanged end v
23、alves The nominal inlet size (DN) shall be 40, 50 or 65. 5.2 Screwed end valves The nominal inlet size (DN) shall be 1, 2 or 2. 6 Temperature rating Both low pressure and high pressure valves shall be suitable for continuous use at their nominal pressure rating throughout the temperature range from
24、0C to 38C. 7 Marking 7.1 General Each valve shall be marked with the following: a) the letters “LP” (for low pressure valves) or “HP” (for high pressure valves) in a position which will be visible after the valve has been installed; b) the nominal size; c) the manufacturers name or trademark; d) the
25、 number of this standard, i.e. BS5041/1 1) . 7.2 Diaphragm valves The diaphragm shall be marked “FIRE HYDRANT”, “FIRE HYD” or with the manufacturers grade reference for the particular material. The marking shall be visible on the assembled valve. 1) Marking BS5041/1 on or in relation to a product is
26、 a claim by the manufacturer that the product has been manufactured to the requirements of the standard. The accuracy of such a claim is therefore solely the manufacturers responsibility. Enquiries as to the availability of third party certification should be addressed to the appropriate certificati
27、on body.BS5041-1:1987 BSI 03-1999 3 Section 2. Design 8 Materials Each component or part of the valve shall be made from one of the materials given in Table 1. 9 Valve bodies 9.1 Body wall thickness The body wall thickness at any point shall be as follows. a) For low pressure valves: not less than s
28、hown in Table6 of BS5154:1983 for PN16 for the appropriate size of valve. b) For high pressure valves: not less than shown in Table6 of BS5154:1983 for PN20 for the appropriate size of valve. 9.2 Body seat The body seat shall be either integral with the body or inserted in the form of a securely fit
29、ted but renewable ring. The shape of the seating surface shall be suited to the type of disk used (seeclause16). 9.3 Seating face The seating face shall be not less than 3mm wide. 10 Valve inlets 10.1 General Valve inlets shall be either flanged (see10.2) or screwed (see10.3). 10.2 Flanged ends 10.2
30、.1 Inlet flanges shall be in accordance with the following tables in BS4504-2:1974, with the possible exception of drilling (see10.2.2): a) for low pressure valves: Table 16/21 for the appropriate size of valve; b) for high pressure valves: Table 25/21 for the appropriate size of valve. The casting
31、surrounding 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
32、 BS1806 or BS4518. 10.2.2 If the purchaser does not specify drilling requirements for the flanges, they shall be drilled in accordance with Table 16/21 (low pressure valves) or Table 25/21 (high pressure valves) of BS4504-2:1974. 10.3 Screwed ends 10.3.1 Body ends shall be hexagonal or of shape suit
33、able for a hook or “C” spanner to facilitate tightening. 10.3.2 Screwed ends shall have male or female threads complying with BS21. 10.3.3 The thickness of male ends shall be not less than 3mm from the root diameter of the thread to the bore of the inlets. 11 Valve outlets Outlet end connections sha
34、ll be either integral or screwed on, and shall be of female instantaneous pattern complying with BS336. 12 Bonnets 12.1 Diaphragm valves The bonnet to body connection shall be bolted. 12.2 Globe valves The bonnet to body connection shall be screwed or union or bolted. The surfaces forming the bonnet
35、 and body joint shall be 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. 12.3 Bonnet wall thickness The bonnet wall thickness at any point shall be as follows: a) for low pressure valves: not less than shown
36、in Table 6 of BS5154:1983 for PN16 for the appropriate size of valve; b) for high pressure valves: not less than shown in Table 6 of BS5154:1983 for PN20 for the appropriate size of valve. 13 Stems 13.1 General Valves shall be of the rising stem inside screw type, having the actuating thread within
37、the bonnet or otherwise protected from damage and the external environment. They shall be formed in one piece, and shall be of sufficient length to ensure a minimum clearance of 40mm between the handwheel and any part of the valve vertically below the periphery of the handwheel, and between the hand
38、wheel and the plunger release lug on the outlet.BS5041-1:1987 4 BSI 03-1999 Table 1 Choice of materials for components and parts Component Material British Standard number Grade or designation Low pressure and high pressure valves Body Copper alloy 1400 LG2 or LG4 Bonnet Copper alloy 1400 2872 2874
39、LG2 or LG4 CZ114 or CZ122 Stem Copper alloy 2874 CZ112, CZ113, CZ114 or CZ121 Disk Copper alloy 1400 2872 or 2874 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 145
40、2 2789 1490 LG2 or LG4 CZ114 or CZ122 150 or 180 LM6 or LM25 Renewable disk facing Rubber Chloroprene 1154 2752 70 IRHD minimum nominal hardness Diaphragm Rubber Manufacturers standard Black cap Copper alloy 1400 2872 LG2 or LG4 CZ114 or CZ122 Aluminium alloy a 1490 LM5 condition M LM6 condition M L
41、M16 condition TF LM25 condition TB or TF Bolting: globe valves diaphragm valves Carbon steel b , tensile strength not less than 390 N/mm 2 Aluminium bronze 1506 2872 162 CA104 Compressor Grey cast iron Copper alloy 1452 1400 150 LG2 or LG4 High pressure valves only Relief valve seating Rubber Chloro
42、prene 1154 2752 85 IRHD minimum nominal hardness Nylon Hardness HV 5 to HV 12 when measured in accordance with BS427-1 Relief valve spring Copper alloy Stainless steel Pressure regulating spring Chrome vanadium steel BS 970-5 735 A50 a The surface shall have an anodized finish of thickness not less
43、than grade AA15 of BS1615:1987, and the anodic oxidation coating shall be sealed (see clause7 of that standard). b Free cutting steels shall not be used.BS5041-1:1987 BSI 03-1999 5 13.2 Stem sizes The diameter of the stem shall be not less than16mm where the stem is made from CZ114, or19mm where the
44、 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 than 12mm 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 s
45、tems The actuating thread shall be either Acme form or “V” form. The root diameter of the thread shall be not less than the following: a) 16mm for stems of CZ114; b) 19mm for stems of CZ112, CZ113 or CZ121. 13.4 Retention of stem It shall not be possible for the spindle to pass completely through th
46、e gland nut. 14 Stem sealing on globe valves Globe valves shall be provided with one of the following means of sealing the stems: a) an “O” ring complying with BS1806 or BS4518; or b) a rubber gland seal; or c) a stuffing box gland. It shall be possible to replace the seal or repack the gland when u
47、nder pressure with the valve fully closed. 15 Glands on globe valves Glands on globe valves 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 Disks and
48、disk facings Disks shall be provided with resilient facings which may be renewable or bonded. 17 Handwheels and operation The valve shall be closed by turning the handwheel in a clockwise direction when facing the handwheel. The number of complete turns of the handwheel to fully open a completely cl
49、osed valve shall be not less than four nor more than10. Handwheels shall be marked with the SHUT direction. Handwheels shall have a diameter of not less than100mm. 18 Bolting Bolting shall be in accordance with one of the standards given in Table 2. Table 2 Bolting for valves 19 Pressure retention 19.1 Body test A valve shall show no sign of leakage or distortion of the body when tested in accordance with A.1.1 (seealso25.1). NOTEThis requirement is for the integrity of the valve body, not the strength of the release mechan
