BS 21-1985 Pipe threads for tubes and fittings where pressure-tight joints are made on the threads
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ID： |
2CE652CBE59842B4AAC4967375881534 |
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文件大小(MB)： |
0.6 |
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页数： |
22 |
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文件格式： |
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日期： |
2010-10-4 |
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文本摘录（文本识别可能有误，但文件阅览显示及打印正常，pdf文件可进行文字搜索定位）：
BRITISH STANDARD BS 21:1985,Reprinted,incorporating,Amendment No. 1,Specification for,Pipe threads for tubes,and fittings where,pressure-tight joints,are made on the threads,(metric dimensions),621.643.414 – 762.4:621.882.082.22,Licensed copy:PONTYPRIDD COLLEGE, 25/09/2006, Uncontrolled Copy, . BSI,BS 21:1985,This British Standard, having,been prepared under the,direction of the Piping,Systems Standards Committee,was published under the,authority of the Executive,Board and comes,into effect on,30 September 1985,. BSI 03-1999,First published April 1905,First revision November 1909,Second revision November 1938,Third revision December 1957,Fourth revision March 1973,Fifth revision September 1985,The following BSI references,relate to the work on this,standard:,Committee reference PSE/9,Draft for comment 83/78475 DC,ISBN 0 580 14556 5,Committees responsible for this,British Standard,The preparation of this British Standard was entrusted by the Piping Systems,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 Gas Corporation,British Hydromechanics Research Association,British Internal Combustion Engine Manufacturers’ Association,British Malleable Tube Fittings Association,British Steel Industry,British Valve Manufacturers’ Association Ltd.,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,6633 December,1990,Indicated by a sideline in the margin,Licensed copy:PONTYPRIDD COLLEGE, 25/09/2006, Uncontrolled Copy, . BSI,BS 21:1985,. BSI 03-1999 i,Contents,Page,Committees responsible Inside front cover,Foreword ii,1 Scope 1,2 Definitions 1,3 Symbols 2,4 Basic forms of pipe threads 2,5 Jointing threads 3,6 Longscrew threads 4,Appendix A Recommended gauging systems for jointing threads 10,Appendix B Methods of verification of jointing thread dimensions and,form using recommended gauging systems described in Appendix A 15,Appendix C Special parallel external threads for gas appliances,where pressure-tight seals are made on machined faces 15,Figure 1 — Terms relating to pipe threads 1,Figure 2 — Basic Whitworth form 3,Figure 3 — Basic form of taper pipe thread 4,Figure 4 — Typical designs illustrating internal taper or parallel,pipe threads complying with 5.1 5,Figure 5 — System A screw gauges assembled respectively with,threads of maximum and minimum sizes 7,Figure 6 — System B screw gauges assembled respectively with,threads of maximum and minimum sizes 8,Figure 7 — Taper full-form screw plug gauge (system A) 10,Figure 8 — Taper full-form screw ring gauge (system A) 10,Figure 9 — Taper full-form screw plug gauge (system B) 12,Figure 10 — Taper full-form screw ring gauge (system B) 12,Figure 11 — Taper plain plug gauge (system B) 12,Figure 12 — Taper plain ring gauge (system B) 12,Table 1 — Lengths for dimension A in Figure 4 6,Table 2 — Basic dimensions and limits of size 9,Table 3 — Dimensions of taper full-form screw plug and ring gauges,for system A 11,Table 4 — Dimensions of taper full-form screw and taper plain plug,and ring gauges for system B 13,Table 5 — Manufacturing tolerances for gauges for systems A and B 14,Table 6 — Special parallel external threads for gas appliances where,pressure-tight seals are made on machined faces 16,Publications referred to Inside back cover,Licensed copy:PONTYPRIDD COLLEGE, 25/09/2006, Uncontrolled Copy, . BSI,BS 21:1985,ii . BSI 03-1999,Foreword,This revision of BS 21 has been prepared under the direction of the Piping,Systems Standards Committee and supersedes BS 21:1973 which is withdrawn.,The basic thread is that given in ISO 7/1-1982 published by the International,Organization for Standardization (ISO) but this standard also includes,requirements for longscrew threads and for thread forms, and recommended,methods of gauging threads, given in the previous edition of BS 21.,The implementation of ISO 7/2-1982 has not been considered necessary as the,dimensional and geometrical controls imposed by the ISO gauging system are,available through the BS 21:1973 gauging system, which has been retained in,this edition.,This edition of this standard relates to metric dimensions on……
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