BS 2779-1986 Specification for Pipe threads for tubes and fittings where pressure-tight joints are not made on the threads
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ID： |
F12485A8BC7B4B1DA47C6EFB6BE3DFCC |
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文件大小(MB)： |
0.39 |
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页数： |
20 |
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日期： |
2010-10-4 |
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BRITISH STANDARD BS 2779:1986,Specification for,Pipe threads for tubes,and fittings where,pressure-tight joints,are not made on the,threads (metric,dimensions),UDC 621.643.414:621.882.082.1,Licensed Copy: AUB User, na, Sun Mar 25 13:38:08 GMT+00:00 2007, Uncontrolled Copy, (c) BSI,BS 2779:1986,This British Standard, having,been prepared under the,direction of the Piping Systems,Components Standards,Committee, was published,under the authority of the,Board of BSI and comes,into effect on,29 August 1986,. BSI 12-1998,First published December 1956,First revision April 1973,Second revision August 1986,The following BSI references,relate to the work on this,standard:,Committee reference PSE/9,Draft for comment 85/75381 DC,ISBN 0 580 15212 X,Committees responsible for this,British Standard,This British Standard was entrusted by the Piping Systems Components,Standards Committee (PSE/-) to Technical Committee PSE/9, upon which the,following bodies were represented:,Association of Hydraulic Equipment Manufacturers,British Compressed Air Society,British Engine Group of the Society of Motor Manufacturers and Traders,British Gas Corporation,British Hydromechanics Research Association,British Malleable Tube Fittings Association,British Steel Industry,British Valve Manufacturers Association Ltd.,Copper Tube Fittings Manufacturers’ Association,Department of Trade and Industry (National Engineering Laboratory),Energy Industries Council,Engineering Equipment and Materials Users’ Association,Gauge and Tool Makers’ Association,Institution of Civil Engineers,Institution of Gas Engineers,Institution of Public Health Engineers,Institution of Water Engineers and Scientists,Water Authorities Association,Water Companies Association,Wrought Fitting Makers’ Association,Amendments issued since publication,Amd. No. Date of issue Comments,Licensed Copy: AUB User, na, Sun Mar 25 13:38:08 GMT+00:00 2007, Uncontrolled Copy, (c) BSI,BS 2779:1986,. BSI 12-1998 i,Contents,Page,Committees responsible Inside front cover,Foreword ii,1 Scope 1,2 Symbols 1,3 Classification and designation 1,4 Thread details 4,Appendix A Special truncated form of the Whitworth,thread for class A external threads 5,Appendix B Notes on tolerancing system structure 5,Appendix C Method of verification of thread size and,form by means of limit gauges 6,Appendix D Gauges for the method given in appendix C 8,Figure 1 — Thread profile and tolerance zones 4,Figure 2 — Special truncated external thread 5,Figure 3 — NOT GO screw calliper gauge 7,Figure 4 — Start of complete thread 8,Figure 5 — Chamfer of start of thread 8,Figure 6 — Thread profiles of GO ring gauges and,their check plugs 9,Figure 7 — Relative positions of pitch diameter tolerance,zones for GO ring gauges and their check plugs 10,Figure 8 — Thread profiles of NOT GO ring gauges and their,check plugs and calliper gauges 11,Figure 9 — Relative positions of pitch diameter tolerance zones,for NOT GO ring gauges, calliper gauges and their check plugs 12,Figure 10 — Thread profiles of Go and NOT GO plug gauges 13,Figure 11— Relative positions of pitch diameter tolerance zones,for GO and NOT GO plug gauges 14,Table 1 — Basic dimensions and tolerances 3,Table 2 — Special truncated fastening threads,class A external threads 5,Table 3 — Dimensions for GO and NOT GO gauges and,their check plugs for class A external threads and for GO,gauges and their check plugs for class B external threads 9,Table 4 — Other values for GO and NOT GO gauges and,their check plugs for class A and class B external threads,as a function of the pitch, P 10,Table 5 — Dimensions for NOT GO gauges and their,check plugs for class B external threads 11,Table 6 — Dimensions for threaded GO and NOT GO plug gauges 13,Table 7 — Other values for GO and NOT GO plug gauges as,a function of the pitch, P 14,Publications referred to Inside back cover,Licensed Copy: AUB User, na, Sun Mar 25 13:38:08 GMT+00:00 2007, Uncontrolled Copy, (c) BSI,BS 2779:1986,ii . BSI 12-1998,Foreword,This revision of BS 2779 has been prepared under the direction of the Piping,Systems Components Standards Committee. It supersedes BS 2779:1973, which,is withdrawn.,This standard is based on and is technically equivalent to the two Parts of,ISO 228 “Pipe threads where pressure-tight joints are not made on the threads”,namely ISO 228/1-1982 “Designation, dimensions and tolerances”, and,ISO/2-1980 “Verification by means of limit gauges”; both Parts are published by,the International Organization for Standardization (ISO).,This standard provides a range of thread sizes which are considered to be,necessary to fulfil general requirements. Dimensions are g……
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