1、 UDC 665.6.005 : 621.643.4.06: 669.14134 (Reprinted, incorporating Amendments Nos. 1 and 2) Specification for Steel pipe fittings, BS 3799:1974 screwed and socket-welding for the petroleum industry British Standards Institution This British Standard, having been approved by the Petroleum Equipment I
2、ndustry Standards Committee, was published under the authority of the Executive Board on 30th August, 1974 British Standards Institution, 1974. BS 2561 First published, February, 1955. BS 1684 First published, December, 1950. First published as BS 3799, September, 1964. First revision, August, 1974.
3、 ISBN : 0 580 08494 9 Copyright Users of British Standards are reminded that copyright subsists in all BSI publications. No part of this publication may be reproduced in any form without the prior permission in writing of BSl. This does not preclude the free use, in the course of implementing the st
4、andard, of necessary details such as symbols and size, type or grade designations. Enquiries should be addressed to the BSI Secretariat. Contract requirements Attention is drawn to the fact that this British Standard does not purport to include all the necessary provisions of a contract. Revision of
5、 British Standards In order to keep abreast of progress in the industries concerned, British Standards are subject to periodical review. Suggestions for improvements will be recorded and in due course brought to the notice of the committees charged with the revision of the standards to which they re
6、fer. Bntish Standards are revised, when necessary, by the issue either of amendment slips or of revised editions. It is important that users of British Standards should ascertain that they are in possession of the latest amendments or editions. Full informa!lon on all BSI publications, numbering ove
7、r 9000 will be found in the BSI Catalogue. This information is supplemented by details published each month in BSI News of new publications, revisions and amendments. BSI News is available to Subscribing Members of the Institution. All other publications may be purchased direct from Sales Department
8、. Enquiries concerning subscribing membership, which has considerable advantages. will be welcomed. and should be made to Subscriptions Department. Both departments are located at: Linford Wood, Milton Keynes MKI4 6LE (Telephone 0908 320033; Telex 825777). The following BSI references relate to the
9、work on this standard: Committee reference PEE/2 Draft for comment 72/33133 DC Co-operating organizations The Petroleum Equipment Industry Standards Committee, under whose supervision this British Standard was prepared, consists of representatives from the following Government department and scienti
10、fic and industrial organizations: British Gas Corporation British Mechanical Engineering Confederation British Rubber Manufacturers Association Ltd British Steel Industry council of British Manufacturers of Petroleum Equipment Department of Trade and Industry, Oil *Oil Companies Materials Associatio
11、n The 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 standard: British Chemical Engineering Contractors Association British Steel Corporation British Valve Manufacturers Associati
12、on 8603-8 0.5k-B Confederation of British Industry Engineering Equipment Users Association National Association of Drop Forgers and Stampers 3021 5518 June 1979 March 1987 As indicated by a line in the margin As indicated by a line in the margin 26 8 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 BS 3
13、799 1974 Contents Co-operating organizations Foreword Page Inside front cover 2 Specification 1. General 1.1 Scope 1.2 Sizes and size identification 1.3 Designation 1.4 Pressure/temperature ratings 1.5 Manufacture 1.6 Certification 2. Design 2.1 Screwed fittings 2.2 Screwed and socket-welding unions
14、 2.3 Threading 2.4 Dimensions of screwed fittings 2.5 Dimensions of socket-welding fittings 2.6 Tolerances for socket-welding fittings 2.7 Workmanship and finish 3. Materials 4. Marking 4.1 Method of marking 4.2 Required markings 4.3 Permissible omission of markings 5. Inspection and test 5.1 Impact
15、 testing 5.2 Hydrostatic testing 5.3 Inspection 5.4 Test facilities Foreword 3 3 4 4 4 4 4 5 5 5 5 5 5 6 6 6 6 6 6 6 6 Page Appendix A. Notes to purchaser Tables I. Pressure/temperature ratings 2. Tolerances for socket-welding fittings 3. Materials and material identification symbols 4. Screwed fitt
16、ings. Dimensions of 90 o elbows, crosses, tees and 45 o elbows 5. Screwed fittings. Dimensions of couplings, half-couplings and caps 6. Screwed fittings. Minimum dimensions of pipe plugs 7. Screwed fittir.gs. Minimum dimensions of bushings 8. Screwed fittings. Dimensions of hexagonal nipples 9. Scre
17、wed fittings. Dimensions of round nipples 10. Screwed fittings. Dimensions of unions II. Screwed fittings. Minimum dimensions of welding bosses 12. Fittings. Dimensions of swage nipples 13. Socket-welding fittings. Dimensions of 90 o elbows, crosses, tees and 45 o elbows. 14. Socket-welding fittings
18、. Dimensions of couplings, half-couplings and caps 15. Socket-welding fittings. Dimensions of unions 16. Socket-welding fittings. Dimensions of welding bosses Figure I. Designation of outlets 4 This British Standard has been prepared under the authority of the Petroleum Equipment Industry Standards
19、Committee. It is the metric version of BS 3799 which has also been revised so as to include welding bosses and round and swaged nipples, for which there is a general requirement. Flush bushings, bull plugs and all 2000 lb fittings have been deleted as there is now negligible usage of these types. No
20、n-preferred sizes of all items, and hexagonal nipples over 2 in. nominal size have also been omitted. A wider range of materials has been introduced and the material references have been revised in line with the current materials standards. The bore diameter of sockets has also been modified to enab
21、le pipe with dimensions in accordance with ISO/R 64 (BS 3600) to be used in addition to pipe with the dimensions given in BS 1600 (API). Certain measurements, notably nominal sizes, have not been converted into metric units since the use of imperial units in such cases follows established internatio
22、nal practice in the petroleum industry; for ttus reason and also to retain identifica:tion, the designations 3000 lb and 6000 lb have been maintained. In order to ensure interchangeability requirements, ANSI 816.11, ASTM 234 and ASTM A403 have been taken into account in the preparation of this docum
23、ent. Acknowledgment is made to the American National Standards Institute (ANSI), the American Society for Testing Materials (ASTM), and the American Petroleum Institute (API) for data used in this standard. 2 BS 3799 1974 British Standard Specification for Steel pipe fittings, screwed and socket-wel
24、ding for the petroleum industry 1. General 1.1 Scope This British Standard specifies requirements for forged carbon and alloy steel screwed and socket-welding fittings for use in the petroleum and petrochemical industry. Screwed fittings specified in this standard are intended for assembly. with pip
25、e threaded in accordance with API Std. 58 or ANSI 82.1. (N.P.T.) Socket-welding fittings specified in this standard are primarily intended for assembly with plain end pipe dimensioned in accordance with BS 1600 and API Std. 5L. lt should be noted, however, that with the exception of nominal size 2!
26、in (65 mm) the socket dimensions are also suitable for use with plain end pipe dimensions in accordance with BS 3600 (ISO/R 64). See Notes to Purchaser (Appendix A) and Tables 13 and 16. This standard provides for the following: ( l) Screwed fittings : Elbows, 90 o and 45 o Crosses Tees Couplings an
27、d half-couplings Caps Square, hexagonal and round head plugs Hexagonal head bushings Hexagonal and round nipples Unions Welding bosses Swage nipples (2) Socket-welding fittings: Elbows, 90 o and 45 Crosses Tees Couplings and half-couplings Caps Unions Welding bosses Swage nipples NOTE. The Standards
28、 referred to in this standard are listed on the inside back: cover. 1 .2 Sizes and size identification The size of a fitting is identified by the nominal size of the pipe with which it is to be used. For reducing fittings, the openings are given in the alphabetical sequence shown in Fig. I, the run
29、openings being stated first, followed by the outlet opening(s). In each case, the larger opening is specified first. These fittings may be ordered in any combination of end preparation (see Table 12 with footnote). 3 BS 3799 1974 b c a Fig. 1. Designation of outlets Fittings of the following nominal
30、 sizes are included: (l) Screwed: lin (6 mm) up to and including 4 in (100 mm). (2) Socket-welding: lin (6 mm) up to and including 3 in (80 mm). 1 .3 Designation Fittings to this standard shall be designated as 3000 lb and 6000 lb. These designations represent the maximum cold non-shock working pres
31、sures of the fittings in pounds force per square inch. For convenient reference, schedule numbers of pipe normally used with these fittings are as follows: Designation 3000lb 6000lb Screwed fittings Schedule 80 Double extra strong Socket-welding fittings Schedule 80 Schedule 160 Bore dimensions give
32、n in the relative tables for 3000 lb socket-welding fittings correspond to Schedule 40 pipe. 1.4 Pressure/temperature ratings Pressure/temperature ratings are listed in Table I. Solid plugs and bushings do not carry specific ratings and are intended for use with screwed fittings of any of the design
33、ations shown in 1.3. 1.5 Manufacture Fittings may be produced by any of the following recognized processes: (I) Forging: elbows, crosses, tees. (2) Forging or machining from bar stock: caps, bushings, hexagonal nipples, pipe plugs, unions. (3) Forging, or machining from bar stock or seamless pipe: c
34、ouplings, half-couplings, welding bosses, round and swage nipples. This standard does not cover fittings which have been fabricated by welding. 1 .6 Certification By agreement between the purchaser and the manufacturer, the basis of acceptance by the purchaser of the fittings covered by his order ma
35、y be a certificate stating that such fittings comply with the requirements of this standard, and that the material from which they are made has the chemical and physical characteristics specified in the appropriate standards listed in Table 3. 2. Design 2.1 Screwed fittings Screwed fittings shall be
36、 designed to withstand the stresses resulting from assembly. For this purpose, elbows, tees and crosses shall be designed with wide reinforcing bands of heavy section connecting at the crotch of the fitting, resulting in additional wall thickness over the full length of the tapped ends. Screwed coup
37、lings, caps and similar fittings may have this additional wall thickness provided over their full length. 4 CAUTION. Unions should only be used as complete assemblies because component parts of unions made by different manufacturers, or component parts of different types of unions made by the same m
38、anufacturer, are not necessarily interchangeable. BS 3799 1974 4. Marking 4.1 Method of marking The method of marking used shall not be harmful to the fittings. Hard stamping is permissible only by roller stamping. Stamping shall be done lightly and carefully so as to minimize the notch effect and n
39、ot so deep as to cause cracks or reduce the wall thickness of fittings below the minimum allowed. Stamping shall be applied prior to any final heat treatment when appropriate. 4.2 Required markings Solid plugs, bushings and hexagonal nipples shall be clearly and indelibly marked with the following:
40、(1) Manufacturers name or trademark. (2) Material identification symbol (not required for carbon steel WPB). All other fittings shall be clearly and indelibly marked with the following: (1) Manufacturers name or trademark. (2) Material identification symbol (not required for carbon steel WPB). (3) D
41、esignated pressure rating. (4) Nominal size in inches (this may be omitted from reducing fittings). Example of markings: a. A.B.Co. b. WPl c. 3000 lb d. 2 4.3 Permissible omission of markings Where the size of fittings does not permit full markings, these may be omitted in the following sequence: (I
42、) Nominal size (2) Designated pressure rating (3) Manufacturers name or trademark. 5. Inspection and test 5.1 Impact testing Fittings ordered for use in low temperature services shall be subject to the requirements specified in the relevant material specification and in accordance with the requireme
43、nts of BS 131 : Part 2 and if so specified by the purchaser. 5.2 Hydrostatic testing Hydrostatic testing of fittings other than unions is not required by this standard, but all fittings shall be capable of withstanding a hydrostatic test pressure of 1.5 times their designated pressure rating (see 1.
44、4). This test shall be applied only when specified in the purchasers order. All unions shall be subjected to a seat test by the application of an internal air pressure of 20 bar whilst the fitting is completely immersed in water or light oil. 5.3 Inspection The purchaser or his representative shall,
45、 for the purpose of inspection, have free access at all reasonable times to those parts of the manufacturers works engaged on the purchasers order. He shall be afforded all reasonable facilities for satisfying himself that the fittings are being manufactured in accordance with this standard. 5.4 Tes
46、t facilities The manufacturer shall supply the material required for testing, supply and prepare the necessary test pieces, and supply the labour and appliances for such testing as may be car.ried out on his premises in accordance with this standard. In the absence of facilities at his own works for
47、 making the prescribed tests, the manufacturer shall arrange for the tests to be carried out elsewhere. 1 bar = 10“ N/m = 105 Pa. 6 This page deliberately left blank Table 1. Pressure/temperature ratings Bar/C BS 3799 : 1974 8 Material WPA WPLO WPI WPII WPZ2 WP5 WPL3 WP304 WP304 WP304 WPB + + H L r-
48、1-r-1-.-,-Temp. 3000 6000 3000 6000 3000 6000 3000 6000 3000 6000 3000 6000 3000 6000 3000 6000 3000 6000 3000 6000 oc lb lb lb lb lb lb lb lb lb lb lb lb lb lb lb lb lb lb lb lb -1-1-100/-SO 207 414 177 354 147 295 -1-1-1-S0/-30 207 414 207 414 177 354 147 295 1-1- -f.-30/+40 207 414 207 414 207 41
49、4 207 414 207 414 207 414 207 414 177 354 177 354 147 295 -1-1- f-50 206 411 207 414 207 414 207 414 207 414 207 414 206 4ll 172 345 172 345 147 294 -1- -f-1-1-75 203 406 203 406 203 406 203 406 203 406 203 406 203 406 165 330 165 330 146 292 1- -1-1- - -1-100 200 401 200 401 200 401 200 401 200 401 200 401 200 401 155 311
