BS-1740-1-1971.pdf
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1、BRITISH STANDARD CONFIRMED OCTOBER 1983 BS 1740-1: 1971 Incorporating Amendment Nos. 1, 2 and 3 Specification for Wrought steel pipe fittings (Screwed BSP thread) Licensed Copy: sheffieldun sheffieldun, na, Fri Nov 24 06:08:19 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 1740-1:1971 This British St
2、andard, having been approved by the Mechanical Engineering Industry Standards Committee, was published under the authority of the Executive Board on 28 June 1971 BSI 10-1999 First published June 1951 First revision July 1965 Second revision June 1971 The following BSI references relate to the work o
3、n this standard: Committee reference MEE/121 Draft for comment 69/11845 ISBN 580 06992 3 Co-operating organizations The Mechanical Engineering Industry Standards Committee, under whose supervision this British Standard was prepared, consists of representatives from the following Government departmen
4、ts and scientific and industrial organizations: Associated Offices Technical Committee Association of Consulting Engineers Association of Mining Electrical and Mechanical Engineers British Chemical Plant Manufacturers Association British Compressed Air Society British Electrical and Allied Manufactu
5、rers Association British Gear Manufacturers Association British Internal Combustion Engine Manufacturers Association British Mechanical Engineering Confederation British Pump Manufacturers Association British Steel Industry* Crown Agents for Oversea Governments and Administrations Department of Empl
6、oyment and Productivity Department of the Environment Department of Trade and Industry Department of Trade and Industry National Engineering Laboratory Electricity Council, the Central Electricity Generating Board and the Area Boards in England and Wales Engineering Equipment Users Association Gas C
7、ouncil Institution of Civil Engineers Institution of Gas Engineers* Institution of Heating and Ventilating Engineers Institution of Mechanical Engineers Institution of Mechanical Engineers (Automobile Division) Institution of Production Engineers Locomotive and Allied Manufacturers Association of Gr
8、eat Britain London Transport Executive Machine Tool Trades Association Ministry of Defence Ministry of Defence, Army Department National Coal Board National Physical Laboratory (Department of Trade and Industry) Royal Institute of British Architects Water-tube Boilermakers Association The scientific
9、 and industrial organizations marked with an asterisk in the above list, together with the following, were directly represented on the committee entrusted with the preparation of this British Standard: Institution of Municipal Engineers Metropolitan Water Board Welding Institute Wrought Fittings Mak
10、ers Association lndividual manufacturers Amendments issued since publication Amd. No.Date of issueComments 4170February 1983 5517March 1987 6240May 1990Indicated by a sideline in the margin Licensed Copy: sheffieldun sheffieldun, na, Fri Nov 24 06:08:19 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS
11、1740-1:1971 BSI 10-1999i Contents Page Co-operating organizationsInside front cover Forewordiii 1Scope1 2Materials1 3Screwed ends of fittings1 4Method of specifying outlets1 5Dimensions and tolerances2 6Tests2 7Hot dip galvanizing2 8Certificate of compliance3 Appendix A Method of testing the zinc co
12、ating on galvanized steel pipe fittings (copper sulphate test)Inside back cover Figure 1 50 mm 80 mm tee2 Figure 2 40 mm 25 mm 25 mm tee2 Figure 3 Internal parallel thread (Rp)3 Figure 4 External parallel thread (R)3 Figure 5 Elbow, equal4 Figure 6 Tee, equal4 Figure 7 Cross, equal4 Figure 8 Elbow,
13、equal 455 Figure 9 Elbow, reducing6 Figure 10 Elbow, male and female, equal7 Figure 11 Tee, increasing on the branch8 Figure 12 Tee, reducing on the run and branch9 Figure 13 Tee, reducing on the run only9 Figure 14 Tee, reducing on the branch10 Figure 15 Standard socket11 Figure 15A Half socket11 F
14、igure 16 Faced socket for longscrews (used in conjunction with backnut shown in Figure 22 and appropriate thread sealant)11 Figure 17 Socket, reducing12 Figure 18 Socket union13 Figure 19 Cap, flat14 Figure 20 Cap, dome14 Figure 21 Plugs15 Figure 22 Backnut (used with socket shown in Figure 16)16 Fi
15、gure 23 Bush17 Figure 24 Hexagon nipple, equal18 Table 1 Screwed ends of fittings (internal parallel thread and external taper thread)3 Table 2 Elbows, tees and crosses, equal4 Table 3 Elbows, equal 455 Table 4 Elbows, reducing6 Table 5 Elbows, male and female, equal7 Table 6 Tees, increasing on the
16、 branch8 Table 7 Tees, reducing (on the run and branch, or on the run only)9 Table 8 Tees, reducing on the branch10 Table 9 Sockets and half sockets, equal11 Licensed Copy: sheffieldun sheffieldun, na, Fri Nov 24 06:08:19 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 1740-1:1971 ii BSI 10-1999 Page
17、Table 10 Sockets, reducing12 Table 11 Socket unions13 Table 12 Caps14 Table 13 Plugs15 Table 14 Hexagon backnuts16 Table 15 Hexagon bushes17 Table 16 Nipples, hexagon, equal18 Licensed Copy: sheffieldun sheffieldun, na, Fri Nov 24 06:08:19 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 1740-1:1971 BS
18、I 10-1999iii Foreword This standard makes reference to the following British Standards: BS 21, Pipe threads for tubes and fittings where pressure-tight joints are made on the threads. BS 1387, Steel tubes and tubulars suitable for screwing to BS 21 pipe threads. BS 3894, Method for converting elonga
19、tion values for steel Part 1: Carbon and low alloy steels. This British Standard for wrought pipe fittings, first published in 1951 and revised in 1965, has been prepared in this second revision under the authority of the Mechanical Engineering Industry Standards Committee. The standard provides for
20、 a range of fittings, screwed British Standard pipe thread to BS 21, for use with steel tubes to BS 1387 and includes for the convenience of users particular of equal sockets and hexagon backnuts as specified in BS 1387. Based on experience and usage rates the range of fittings has been considerably
21、 reduced from that contained in the 1965 edition, and no reference is now made to side outlet fittings. Similarly, the range of sizes for some of the fittings retained in this standard has been reduced. Fittings of other types and sizes of outlet not covered by this standard can be made to special o
22、rder. Experience has also shown that there is no requirement for wrought iron fittings and consequently all reference to wrought iron fittings has been deleted from this standard. The metric nominal sizes are based upon international agreement. Other dimensions, except for the sizes of hexagons whic
23、h have been selected from those in BS 4229, “Sizes of non-ferrous and ferrous bars”, Part 2, “Ferrous bars”, have been converted in accordance with BS 350, “Conversion factors and tables”, Part 2, “Detailed conversion tables”, and have been rounded to values which ensure practical interchangeability
24、. Pieces, longscrews, barrel nipples, close taper nipples, running nipples, bends, springs and return bends are covered in BS 1387. NOTE 1In this standard all pressures are gauge pressures and are expressed in N/m2 or agreed multiples thereof. 1 bar = 105 N/m2. A British Standard does not purport to
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