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1、BRITISH STANDARD BS 1640-2: 1962 Incorporating Amendment Nos. 1, 2 and 3 Specification for Steel butt-welding pipe fittings For the petroleum industry Part 2: Wrought and cast austenitic chromium-nickel steel fittings UDC 621.643.4:621.791.053.6:665.5 Licensed Copy: sheffieldun sheffieldun, na, Fri
2、Nov 24 08:05:11 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 1640-2:1962 This British Standard, having been approved by the Petroleum Equipment Industry Standards Committee and endorsed by the Chairman of the Engineering Divisional Council, was published under the authority of the General Council o
3、n 12 December 1962 BSI 09-1999 First published March 1950 First revision August 1953 Second revision December 1962 The following BSI references relate to the work on this standard: Committee reference, PEE/2 Draft for comment AB(PEE) 8839 ISBN 0 580 01517 3 Co-operating organizations The Petroleum E
4、quipment Industry Standards Committee, under whose supervision this British Standard was prepared, consists of representatives from the following Government department and scientific and industrial organizations: British Iron and Steel Federation* Council of British Manufacturers of Petroleum Equipm
5、ent* Federation of British Rubber and Allied Manufacturers Institute of Petroleum Ministry of Power Oil Companies Materials Association* The industrial organizations marked with an asterisk in the above list, together with the following, were directly represented on the committee entrusted with the
6、preparation of this British Standard: British Valve Manufacturers Association National Association of Drop Forgers and Stampers Amendments issued since publication Amd. No.Date of issueComments 4890April 1963 5747February 1966 6265September 1967 Indicated by a sideline in the margin Licensed Copy: s
7、heffieldun sheffieldun, na, Fri Nov 24 08:05:11 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 1640-2:1962 BSI 09-1999i Contents Page Co-operating organizationsInside front cover Forewordii Section 1. General 1Scope1 2Size and size identification1 3Pressure ratings1 4Materials1 5Manufacture3 6Heat tr
8、eatment3 7Descaling3 8Repair of defects3 Section 2. Dimensions and tolerances 9Dimensions3 10Tolerances4 Section 3. Workmanship, marking, inspection, testing and certification 11Workmanship and finish5 12Marking5 13Inspection6 14Test facilities6 15Prototype bursting tests6 16Non-destructive testing6
9、 17Intercrystalline corrosion test6 18Hydrostatic testing7 19Certification7 Appendix Information to be supplied by the purchaserInside back cover Figure 1 Welding end for wall thicknesses from 1/8 in to 3/4 in inclusive 4 Figure 2 Welding end for wall thicknesses greater than 3/4 in4 Figure 3 Typica
10、l examples of off-square tolerance X checked against reference planes5 Table 1 Materials and material identification symbols2 Table 2 Tolerances5 Table 3 Outside diameter and nominal wall thickness of wrought steel pipe8 Table 4 Dimensions of elbows and return bends9 Table 5 Dimensions of 90 long ra
11、dius tangent elbows10 Table 6 Dimensions of equal tees10 Table 7 Dimensions of reducing tees11 Table 8 Dimensions of reducers (concentric and eccentric)12 Table 9 Dimensions of caps13 Table 10 Dimensions of lap-joint stub ends14 Licensed Copy: sheffieldun sheffieldun, na, Fri Nov 24 08:05:11 GMT+00:
12、00 2006, Uncontrolled Copy, (c) BSI BS 1640-2:1962 ii BSI 09-1999 Foreword This British Standard makes reference to the following British Standards: BS 1501-BS 1506, Steels for use in the chemical, petroleum and allied industries. BS 1560, Steel pipe flanges and flanged fittings (nominal sizes in to
13、 24 in) for the petroleum industry. BS 1600, Dimensions of wrought steel pipe for the petroleum industry. BS 2600, General recommendations for the radiographic examination of fusion welded joints in thicknesses of steel up to 2 inches. BS 2910, General recommendations for the radiographic examinatio
14、n of fusion welded circumferential butt joints in steel pipes. BS 2926, Chromium-nickel austenitic steel electrodes for manual metal-arc welding. BS 3351, Piping systems for the petroleum industry. This British Standard is one of a series of standards for fittings prepared under the authority of the
15、 Petroleum Equipment Industry Standards Committee. It was first published in 1950, and the first revised edition was published in 1953. One of the aims of this standard is to ensure interchangeability in service with similar products of American manufacture. Consequently in the present edition due c
16、onsideration has been given to the latest editions of American Standards ASA.BI6.9, ASA.BI6.28, ASTM.A.234, ASTM.A.351, ASTM.A.403 and ASTM.A.420, and to the American Manufacturers Standardisation Society of the Valve and Fittings Industry Standard Practice SP.43. Account has also been taken of the
17、work of the International Organization for Standardization (ISO) on this subject. The standard no longer provides for cast carbon and cast ferritic alloy steel fittings. Provision is now made for austenitic stainless steel fittings, and also for fittings intended to be used for low temperature servi
18、ce. The revised edition of BS 1640 is in two parts of which this is Part 2. Part 1 deals with wrought carbon and ferritic alloy steel fittings. Acknowledgment is made to the American Standards Association, the American Society for Testing and Materials, and the American Manufacturers Standardisation
19、 Society of the Valve and Fittings Industry for data used in this standard. NOTEIn place of the customary, but incorrect, use of the pound as a unit of force, the unit called a pound-force (abbreviation lbf) has been used in this standard. This is the force which, when acting on a body of mass one p
20、ound, gives it an acceleration equal to that of standard gravity. The unit called ton-force (abbreviation tonf) has also been used where appropriate. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correc
21、t 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, pages 1 to 14, an inside back cover and a back cover. This standard has been updated (see copyri
22、ght date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover. Licensed Copy: sheffieldun sheffieldun, na, Fri Nov 24 08:05:11 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 1640-2:1962 BSI 09-19991 Section 1. General 1 Scope Part 2 of thi
23、s British Standard specifies requirements for wrought and cast seamless and fabricated austenitic chromium-nickel steel butt-welding pipe fittings for use in the petroleum industry. The following types of fittings are provided for: a) 45 long radius elbows; b) 90 long and short radius elbows; c) 90
24、long radius tangent elbows; d) long and short radius return bends; e) equal and reducing tees; f) concentric and eccentric reducers; g) caps; h) lap-joint stub ends. Welding-neck flanges are not included. They are included in BS 15601). The purchaser shall specify in his order whether wrought or cas
25、t seamless fittings are required, or whether wrought or cast fabricated fittings may be supplied. Attention is drawn to the Appendix, which lists information to be supplied by the purchaser. 2 Size and size identification A fitting to this standard shall be identified by the nominal size and wall th
26、ickness or schedule number of the pipe (see Table 3) to which it is intended to correspond in strength. Dimensions are standardized for the sizes and to the extent given in Table 4 to Table 10. 3 Pressure ratings All fittings shall be so designed that their pressure ratings may be calculated as for
27、straight seamless pipe of the same or equivalent material of the same size and of the same nominal wall thickness. For information regarding design stresses at given temperatures for seamless pipe, reference should be made to Table 3 in BS 33512). 4 Materials Fittings to this standard shall be made
28、of material complying with one of the standards given in Table 1. By agreement between purchaser and manufacturer other types of austenitic chromium-nickel steel may be used. NOTEFittings ordered for use in low-temperature services shall be subject to the requirements specified in BS 33512), Clause
29、18 and Table 2. 1) BS 1560, “Steel pipe flanges and flanged fittings (nominal sizes1/ 2 in to 24 in) for the petroleum industry”. 2) BS 3351, “Piping systems for the petroleum industry”. Licensed Copy: sheffieldun sheffieldun, na, Fri Nov 24 08:05:11 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 164
30、0-2:1962 2 BSI 09-1999 Table 1 Materials and material identification symbols A. Wrought materials Material Material standards Identification symbold Seamless pipe Rolled plateForgings Comparable ASTM specification 18 per cent chromium, 18 per cent chromium, 18 per cent chromium, 18 per cent chromium
31、, 18 per cent chromium, titanium stabilized 18 per cent chromium, 18 per cent chromium, titanium stabilized 18 per cent chromium, 18 per cent chromium, 8 per cent nickel steel 8 per cent nickel steel LCa WP 304 WP 304 L A312 grade TP304 A312 grade TP304 L BS 1501-801b Grade B BS 1501-801 Grade C BS
32、1503-801 8 per cent nickel, 10 per cent nickel, 10 per cent nickel, 12 per cent nickel, 12 per cent nickel, 2 2 2 3 3 per cent molybdenum steel per cent molybdenum steel, LCa per cent molybdenum steel, per cent molybdenum steel per cent molybdenum steel, WP 3166 WP 316 L WP 316 Ti WP 317 WP 317 Ti W
33、P 321 WP 347 A312 grade TP316 A312 grade TP316 L A312 grade TP317 A312 grade TP321 A312 grade TP347 BS 1501-845 Grade B BS 1501-845 Grade Ti BS 1501-846 BS 1501-821 Grade Ti BS 1501-821 Grade Nb BS 1503-845 Grade B BS 1503-845 Grade Ti BS 1503-846 BS 1503-821 Grade Ti BS 1503-821 Grade Nb 8 per cent
34、 nickel steel, titanium stabilized 8 per cent nickel steel, niobium stabilized B. Castings MaterialIdentification symbol Material standards 18 per cent chromium, 18 per cent chromium, 18 per cent chromium, 18 per cent chromium, 18 per cent chromium, 18 per cent chromium, 18 per cent chromium, 18 per
35、 cent chromium, 8 per cent nickel steel 8 per cent nickel steel, titanium stabilized 8 per cent nickel steel, niobium stabilized 8 per cent nickel steel, LCa 10 per cent nickel 2 per cent molybdenum steel 10 per cent nickel, 2 per cent molybdenum steel, LCa 10 per cent nickel, 2 per cent molybdenum
36、steel, niobium stabilized 12 per cent nickel, 3 per cent molybdenum steel CF8 CF8T CF8C CF3 CF8M CF3M CF8MC CF8MM BS 1504-801 BS 1504-821 Grade Ti BS 1504-821 Grade Nb BS 1504-801c BS 1504-845 Grade B BS 1504-845c Grade B BS 1504-845 Grade Nb BS 1504-846 NOTEA comprehensive series of British Standar
37、ds for steel pipe for pressure purposes is in course of preparation. Pending publication of these standards reference is made here to comparable ASTM specifications. For dimensions of pipe, see Table 3, extracted from BS 1600, “Dimensions of wrought steel pipe for the petroleum industry”. a LC Low c
38、arbon. b BS 1501, “Steels for use in the chemical, petroleum and allied industries”. c Carbon content limited to 0.03 per cent; 0.5 per cent proof stress, 12.0 tonf/in2 minimum, and a minimum tensile strength of 28 tonf/in2. d When fittings are of welded construction the symbols shown in this column
39、 shall be supplemented by the suffix letter “W”. Licensed Copy: sheffieldun sheffieldun, na, Fri Nov 24 08:05:11 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 1640-2:1962 BSI 09-19993 5 Manufacture Cast fittings shall be made by an appropriate foundry technique, from steel produced by an electric pr
40、ocess. Seamless wrought fittings may be made by any suitable manufacturing process. Fittings fabricated by welding shall be made by an electric fusion-welding process, unless otherwise agreed between purchaser and manufacturer. The qualification requirements for welders and welding operators, the we
41、lding procedure employed in the manufacture of fabricated fittings and welding materials shall be in accordance with BS 3351. For metal-arc welding electrodes see BS 29263). 6 Heat treatment Unless otherwise agreed between purchaser and manufacturer, the fittings shall be heated uniformly to a tempe
42、rature between 1 000 C (1 830 F) and 1 150 C (2 100 F) and then cooled rapidly in air or water. 7 Descaling All finished fittings shall be descaled by an appropriate process. 8 Repair of defects Repairs to welded seams in fabricated fittings when approved, shall be effected by cleaning-out to sound
43、metal and then re-welding. Repaired fittings shall be re-heat treated and re-tested in accordance with the requirements of Clauses 6, 16 and 18. Repairs to cast fittings shall comply with BS 1504, Clause 14. Repaired fittings shall be re-heat treated and re-tested, in accordance with Clauses 16 and
44、18. Section 2. Dimensions and tolerances 9 Dimensions a) General. The dimensions of butt-welding fittings shall be in accordance with Sub-clauses b) to e) of this clause subject to the tolerances given in Clause 10. b) Body thickness of fittings. The body thickness of fittings shall be such that the
45、ir actual bursting pressure is not less than the computed bursting pressure of straight seamless pipe of any of the materials listed in Table 1, having the same size and the same nominal wall thickness. Cast fittings shall be considered to comply with this requirement only if their body thickness is
46、 in excess of that of equivalent wrought fittings by not less than 20 per cent. The computed bursting pressure of straight pipe shall be determined by the following formula: To ensure adequacy of design the manufacturer shall carry out bursting tests on prototype fittings. These bursting tests shall
47、 be made as specified in Clause 15. c) Dimensions of welding ends. The dimensions of the welding ends shall match those of the equivalent straight pipe in Table 3, subject to the tolerances in Clause 10. In order to obtain the proper dimensions at the welding ends, it is permissible to machine the i
48、nside of the fittings to a taper of not less than 1 in 4. In the case of cast fittings the inside and outside surfaces at the ends shall be machine finished overall. The inside surface shall be machined parallel for a distance equal to 1 times the corresponding nominal pipe wall thickness and then r
49、un out into the bore without abrupt change of section. The outside surface may be machined in any manner that avoids sharp angles and abrupt changes of slope in joining the bevel. d) Welding end preparation. Unless otherwise specified by the purchaser the angle of bevel of the welding ends shall be as follows. i) Where the wall thickness at the welding ends is less than ( in the ends shall be machined to a slight chamfer, or may be square, at the manufacturers option. ii) Where the wall thickness
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