BS 6942-2-1989 Design and construction of small kits for oxy-fuel gas welding and allied processes - Specification for kits using refillable gas containers for oxygen and fuel gas《.pdf

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1、BRITISH STANDARD BS 6942-2: 1989 Incorporating Amendment No.1 Design and construction of small kits for oxy-fuel gas welding and allied processes Part2: Specification for kits using refillable gas containers for oxygen and fuel gas ICS 25.160.30BS6942-2:1989 This British Standard, having been prepar

2、ed under the directionof the Welding Standards Policy Committee, waspublished under the authorityof the Board of BSI andcomes into effect on 31 August1989 BSI 04-2000 The following BSI references relate to the work on this standard: Committee reference WEE/18 Draft for comment 87/76280 DC ISBN 0 580

3、 17397 6 Committees responsible for this British Standard The preparation of this British Standard was entrusted by the Welding Standards Policy Committee (WEE/-) to Technical Committee WEE/18, upon which the following bodies were represented: British Compressed Gases Association British Maritime Te

4、chnology British Pressure Gauge Manufacturers Association British Railways Board Consumer Policy Committee of BSI Department of Trade and Industry Consumer Safety Unit CA Division Federation of Civil Engineering Contractors Health and Safety Executive Institution of Production Engineers Co-opted mem

5、bers Amendments issued since publication Amd. No. Date of issue Comments 10714 November 1999 Indicated by a sideline in the marginBS6942-2:1989 BSI 04-2000 i Contents Page Committees responsible Inside front cover Foreword ii 1 Scope 1 2 Definitions 1 3 Design 1 3.1 Carrying or transporting structur

6、e 1 3.2 Gas containers 1 3.3 Gas control 1 3.4 Hose and fittings 1 3.5 Blowpipes 1 4 Safety 1 4.1 Non-return valve 1 4.2 Flame arrestor 1 4.3 Other safety devices 1 5 Stability test 1 6 Eye protection 1 7 Instructions 1 8 Marking 2 Publications referred to Inside back coverBS6942-2:1989 ii BSI 04-20

7、00 Foreword This Part of BS6942 has been prepared under the direction of the Welding Standards Policy Committee to provide a specification for the design and construction of small kits for oxy-fuel gas welding and allied processes that will perform satisfactorily in service and will minimize the haz

8、ards to persons or property from fires and explosion. BS6942 is issued in two Parts. Part1: Specification for kits using one or more non-refillable gas containers for oxygen and fuel gas; Part2: Specification for kits using refillable gas containers for oxygen and fuel gas. Part1 of BS6942 specifies

9、 the type of oxy-fuel gas welding kit aimed primarily at non-industrial, i.e.“do-it-yourself” applications, although it is recognized that such kits may be used in industrial concerns. Part2 specifies the type of kits used in industry, but which may also be used in non-industrial applications. The s

10、afety requirements, in particular, have been specified to give a greater protection to the user than is generally needed in industry where the training and skill of the operator may achieve an equivalent standard of safety. The initial draft for this standard was provided by the British Compressed G

11、ases Association in consultation with the Health and Safety Executive. To both of these organizations due acknowledgement is made. This standard calls for the use of substances and/or procedures that may be injurious to health if adequate precautions are not taken. It refers only to technical suitab

12、ility and does not absolve the user from legal obligations relating to health and safety at any stage. 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 Standa

13、rd 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 and2, an inside back cover and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporate

14、d. This will be indicated in the amendment table on the inside front cover.BS6942-2:1989 BSI 04-2000 1 1 Scope BS6942 specifies requirements for the design and construction of kits for oxy-fuel gas welding and allied processes. This Part of BS6942 covers all kits in which the oxygen and the fuel gas

15、 container are refillable and have a water capacity up to20L. This Part of BS6942 excludes air aspirated equipment, operating from a fuel gas supply only. NOTEThe titles of the publications referred to in this standard are listed on the inside back cover. 2 Definitions For the purposes of this Part

16、of BS6942, the definitions in BS499-1 apply. 3 Design 3.1 Carrying or transporting structure The carrying or transporting structure shall be of a design suitable for the storage, transportation and use of the gas containers and equipment. Liquefied gas and acetylene containers shall be held in such

17、a manner that liquid cannot be drawn off in normal use. The structure shall be non-flammable. It shall be stable, this stability being tested in accordance with clause5. There shall be no obstruction to immediate access to the welding kit controls when in use. If the structure contains a means for s

18、toring the blowpipe, its position should be such that a hot blowpipe cannot come into contact with either the hoses or the gas containers. 3.2 Gas containers Gas containers for oxygen and fuel gases (except dissolved acetylene) shall comply with BS5045-1, BS5045-2, BS5045-3, BS5045-5 or BS5045-6 Gas

19、 containers for use with dissolved acetylene shall comply with BSEN1800. NOTEThe above covers all current standards applicable for new cylinders in the UK. Existing gas containers manufactured to the obsolete specifications BS1045, HOS, HOAL4 and HOAC1 are acceptable for use with these kits. Outlet

20、valve connections for all of these cylinders shall comply with BS341. All gas containers shall meet the requirements of BS5430 or BS6071 as applicable. 3.3 Gas control For fuel gases and oxygen a pressure regulator complying with BSEN ISO2503 shall be fitted at the gas container outlet point. A rese

21、ating pressure relief valve shall be fitted either to the regulator or to the system to prevent a rupture of the hose if the pressure of the gas source can exceed the minimum bursting pressure of the hose. 3.4 Hose and fittings Hose shall comply with BSEN559, and hose fittings shall comply with BSEN

22、560. Hose assemblies shall comply with BSEN1256. The hose shall not exceed5m in length. 3.5 Blowpipes Blowpipes shall comply with BSEN ISO5172. 4 Safety 4.1 Non-return valve A non-return valve, complying with BSEN730, shall be fitted to each blowpipe inlet connection. 4.2 Flame arrestor Flame arrest

23、ors complying with BSEN730 shall be fitted as follows. A flame arrestor shall be integral with or fitted to the blowpipe inlet or the pressure regulator outlet in supply lines for oxygen and fuel gases other than acetylene. In acetylene supply lines, a flame arrestor shall be fitted at the pressure

24、regulator outlet. 4.3 Other safety devices Other safety devices, if fitted, shall comply with BSEN730. 5 Stability test Apply a force of25N in any direction to the highest point of the carrying or transporting structure, complete with the containers full, at the same time preventing the base from mo

25、ving laterally. Repeat the test with the carrying or transporting structure complete with the containers empty. In both tests the carrying or transporting structure shall remain stable. 6 Eye protection Where protective goggles are supplied as part of a kit complying with this standard, the goggles

26、shall comply with the relevant requirements of BS EN175. 7 Instructions Instruction sheets shall cover the following points adequately. a) General hazards from the use of flammable gases and from oxygen enrichment of the atmosphere and clothing.BS6942-2:1989 2 BSI 04-2000 b) Identification and corre

27、ct assembly of components, including instructions for changing gas containers. c) Testing of equipment and joints for leaks. d) Procedure for safe lighting, use, and shut-down of the kit, during normal use and in an emergency. e) Warning of unsafe practices, e.g.welding, brazing or heating of substa

28、nces incorporating toxic materials. f) Hazards of welding, brazing or heating of tanks, drums, pipelines, etc. that contain or have contained flammable substances. g) Removal or shielding of combustible materials from the effects of heat. h) Storage and handling of gas containers and associated equi

29、pment. i) Recommendations for the use of personal protective equipment (particularly eye protection) and clothing. j) The dangers of attempting to refill any type of gas container and the necessity of having the containers refilled by competent persons or establishments (e.g.the original supplier).

30、k) Components which have failed in service shall only be replaced with parts complying with the requirements of this standard. 8 Marking The carrying or transporting structure shall be clearly and indelibly marked with the following information. a) The name and address or trade mark of the manufactu

31、rer or importer or supplier of the kit. b) The following wording: “Original equipment complies with BS6942-2 1) ”. “IMPORTANT USE ONLY RECOMMENDED GAS CONTAINERS” The gas containers shall be clearly marked in accordance with the standard to which they are manufactured (see3.2). 1) Marking BS6942-2 o

32、n or in relation to a product represents a manufacturers declaration of conformity, i.e.a claim by or on behalf of the manufacturer that the product meets the requirements of the standard. The accuracy of the claim is therefore solely the responsibility of the person making the claim. Such a declara

33、tion is not to be confused with third party certification of conformity, which may also be desirable.BS6942-2:1989 BSI 04-2000 Publications referred to BS341, Transportable gas container valves. BS499, Welding terms and symbols. BS499-1, Glossary for welding, brazing and thermal cutting. BS1045, Man

34、ganese steel gas cylinders for atmospheric gases (withdrawn; replaced by BS5045-1). BS5045, Transportable gas containers. BS5045-1, Specification for seamless steel gas containers above0.5litre water capacity. BS5045-2, Specification for steel containers of0.5L up to450L water capacity with welded s

35、eams. BS5045-3, Specification for seamless aluminium alloy gas containers above0.5 litre up to300 bar charged pressure at15 C. BS5045-5, Specification for aluminium alloy containers above0.5litre up to130litres water capacity with welded seams. BS5045-6, Specification for seamless containers of less

36、 than0.5litre water capacity. BS5430, Periodic inspection, testing and maintenance of transportable gas containers (excluding dissolved acetylene containers). BS6071, Specification for periodic inspection and maintenance of transportable gas containers for dissolved acetylene. BS6942, Design and con

37、struction of small kits for oxy-fuel gas welding and allied processes 2) . BS6942-1, Specification for kits using one or more non-refillable gas containers for oxygen and fuel gas. BSEN175, Personal protection. Equipment for eye and face protection during welding and allied processes. BSEN559, Gas w

38、elding equipment. Rubber hoses for welding, cutting and allied processes. BSEN560, Gas welding equipment. Hose connections for welding, cutting and allied processes. BSEN730, Gas welding equipment. Equipment used in gas welding, cutting and allied processes, safety devices for fuel gases and oxygen

39、or compressed air. General specifications, requirements and tests. BSEN1256, Gas welding equipment. Specification for hose assemblies for equipment for welding, cutting and allied processes. BSEN1800, Transportable gas cylinders. Acetylene cylinders. Basic requirements and definitions. BSENISO2503,

40、Gas welding equipment. Pressure regulators for gas cylinders used in welding, cutting and allied processes up to300 bar. BSENISO5172, Manual blowpipes for welding, cutting and heating. Specifications and tests. HOAC1, Home Office. Acetylene. HOAL4, Health and Safety Executive. Specification for seam

41、less steel containers for the conveyance of compressed and liquefied gases (Revision1 June1980). HOS, Health and Safety Executive. Specification for seamless steel containers for the conveyance of compressed and liquefied gases (withdrawn). 2) Referred to in the foreword only.BS 6942-2: 1989 BSI 389

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