1、BRITISH STANDARD BS6956-1: 1988 Jointing materials and compounds Part1: Specification for corrugated metal joint rings UDC621.643.44:62762.445:62408.8:(083.74)BS6956-1:1988 This British Standard, having been prepared under the directionof the Piping Systems Components Standards Committee, was publis
2、hed under the authority of the Board of BSIand comes into effect on 30November1988 BSI 03-1999 The following BSI references relate to the work on this standard: Committee reference PSE/2 Draft for comment85/73237DC ISBN 0 580 16500 0 Committees responsible for this British Standard The preparation o
3、f this British Standard was entrusted by the Piping Systems Components Standards Committee (PSE/-) to Technical Committee PSE/2, upon which the following bodies were represented: Asbestos Information Centre Ltd. British Adhesives and Sealants Association British Gas plc British Pump Manufacturers As
4、sociation British Railways Board Energy Industries Council Engineering Equipment and Materials Users Association Institution of Gas Engineers Liquefied Petroleum Gas Industry Technical Association (UK) Paintmakers Association of Great Britain Ltd. Water Authorities Association Amendments issued sinc
5、e publication Amd. No. Date of issue CommentsBS6956-1:1988 BSI 03-1999 i Contents Page Committees responsible Inside front cover Foreword ii 1 Scope 1 2 Definitions 1 3 Manufacture 1 4 Thickness 1 5 Materials 1 6 Corrugations 1 7 Testing 1 Appendix A Information to be supplied by the purchaser 3 Tab
6、le 1 Thickness of metal 1 Table 2 Materials for corrugated metal joint rings 1 Table 3 Pitch and depth of corrugations 1 Publications referred to Inside back coverBS6956-1:1988 ii BSI 03-1999 Foreword This Part of BS6956 has been prepared under the direction of the Piping Systems Components Standard
7、s Committee. It constitutes a revision of section4 of BS5292:1980, which has been deleted by amendment. The technical content of the section has not been amended but lead has been deleted as a material specified by the section. This standard is one of a group of standards specifying the following ma
8、terials and compounds: compressed asbestos fibre jointing; vulcanized fibre sheets; flexible vulcanized fibre sheets; composition cork jointing; paper and cork/paper jointing; rubber reinforced jointing; corrugated metal joint rings; jointing compounds for use with water,1st and2nd family gases; joi
9、nting material for3rd family gases; anaerobic jointing compounds for use in appliances using1st,2nd and3rd family gases. Appendix A lists information which should be supplied by the purchaser. A British Standard does not purport to include all the necessary provisions of a contract. Users of British
10、 Standards are responsible for their 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 to4, an inside back cover and a back cover. Th
11、is standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on theinside front cover.BS6956-1:1988 BSI 03-1999 1 1 Scope This Part of BS6956 specifies requirements for corrugated metal joint rings when used for sealing mec
12、hanical joints in piping systems carrying1st,2nd and3rd family gases, water or steam. Appendix A lists information to be supplied by the purchaser. 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 of BS69
13、56 the following definitions apply. 2.1 batch a number of corrugated metal joint rings which have been manufactured from the same material from a single delivery of material and which are all of the same thickness 2.2 corrugated metal joint ring a gasket of circular, rectangular, or lobed outline ma
14、nufactured with a series of continuous corrugations from sheet metal and used for the purpose of sealing mating faces of components from the ingress or egress of fluids 3 Manufacture Each batch shall be manufactured from a sheet or sheets from a single delivery of material. Where the available sheet
15、 size permits, a batch shall be manufactured from a single sheet. 4 Thickness The thickness of the metal from which joint rings are made shall be as given in Table 1. Table 1 Thickness of metal 5 Materials Materials shall be selected from Table 2 in a cold rolled condition and in a grade specified i
16、n the relevant British Standard to suit the medium with which it is used. Table 2 Materials for corrugated metal joint rings 6 Corrugations Each corrugation shall be concentric for circular joint rings, and follow the periphery of the joint for non-circular joint rings. The pitch and depth of the co
17、rrugations shall be in accordance with Table 3. Table 3 Pitch and depth of corrugations 7 Testing 7.1 General If the purchaser requests a cracking test (seeAppendix A), the test piece shall be free from cracks after the release of the compressive force when the test procedure given in7.2 is carried
18、out. Metal Thickness mm Brass 0.19up to and including0.40 Copper-nickel alloy 0.25up to and including0.46 Stainless steel 0.31up to and including0.46 Medium Material Relevant BritishStandard 1st,2nd and3rd family gases Brass Copper BS2870 BS2870 Any grade Water 80/20 BS2870 Copper-nickel alloy desig
19、nation CN104 Steam 80/20 BS2870 Copper-nickel alloy designation CN104 Stainless steel grades 301S21 304S15 304S31 BS1449-2 Effective width of joint Pitch of corrugation Maximum depth of corrugation mm mm mm Up to and including9.5 1.6 0.64 Over9.5up to and including19 3.2 1.27 Over19 4.8 6.4 1.9 BS69
20、56-1:1988 2 BSI 03-1999 7.2 Procedure Take from each batch a test piece which is a square approximately75mm 75mm cut from a ring, or a complete ring. Place the test piece between two flat rigid pieces of metal having smooth faces and flatten using an even application of a compressive force. Then rel
21、ease the compressive force.BS6956-1:1988 BSI 03-1999 3 Appendix A Information to be supplied by the purchaser The purchaser should supply the following information in his enquiry and order to the manufacturer: a) the number of this British Standard, i.e.BS6956-1; b) thickness (see clause4); c) mater
22、ial (see clause5); d) whether testing is required (see clause7); e) flange specification and details; f) any special requirements.4 blankBS6956-1:1988 BSI 03-1999 Publications referred to BS1449, Steel plate, sheet and strip. BS1449-2, Specification for stainless and heat-resisting steel plate, shee
23、t and strip. BS2870, Specification for rolled copper and copper alloys: sheet, strip and foil. BS6956-1: 1988 BSI 389 Chiswick High Road London W4 4AL BSIBritishStandardsInstitution BSI is the independent national body responsible for preparing BritishStandards. It presents the UK view on standards
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