BS-7076-2-1989.pdf

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1、BRITISH STANDARD BS 7076-2: 1989 Incorporating Amendment No. 1 Dimensions of gaskets for flanges to BS 1560 Part 2: Specification for metallic ring-joint gaskets for use with steel flanges UDC 621.643.4-762:621.643.344:001.4:006.3/.8 Licensed Copy: London South Bank University, London South Bank Uni

2、versity, Fri Dec 08 11:29:00 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 7076-2:1989 This British Standard, having been prepared under the direction of the Piping Systems Components Standards Policy Committee, was published under the authority of the Board of BSI and comes into effect on 31 Januar

3、y 1990 BSI 06-1999 The following BSI references relate to the work on this standard: Committee reference PSE/15 Draft for comment 87/76412 DC ISBN 0 580 17270 8 Committees responsible for this British Standard The preparation of this British Standard was entrusted by the Piping Systems Components St

4、andards Policy Committee (PSE/-) to Technical Committee PSE/15, upon which the following bodies were represented: British Chemical Engineering Contractors Association British Compressed Gases Association British Fluid Power Association British Foundry Association British Gas plc British Malleable Tu

5、be Fittings Association British Maritime Technology British Non-ferrous Metals Federation British Pump Manufacturers Association British Steel Industry British Valve Manufacturers Association Ltd. Combustion Engineering Association Copper Development Association Department of Trade and Industry (Nat

6、ional Engineering Laboratory) Ductile Iron Producers Association Electricity Supply Industry in England and Wales Energy Industries Council Engineering Equipment and Materials Users Association GAMBICA (BEAMA Ltd.) High Pressure Pipework Consultative Committee Institution of Gas Engineers Institutio

7、n of Mechanical Engineers Institution of Production Engineers Institution of Water and Environmental Management (IWEM) Water Authorities Association The following bodies were also represented in the drafting of the standard, through subcommittees and panels: British Railways Board Health and Safety

8、Executive Amendments issued since publication Amd. No.Date of issueComments 8592June 1995Indicated by a sideline in the margin Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 11:29:00 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 7076-2:1989 BSI 06-1999i Content

9、s Page Committees responsibleInside front cover Forewordii 1Scope1 2Gasket designs1 3Dimensions and tolerances1 4Surface texture1 5Identification number2 6Marking2 Appendix A Gasket materials7 Appendix B Information to be supplied by the purchaser7 Figure 1 Details of metallic ring-joint gaskets as

10、housed1 Figure 2 Dimensions2 Table 1 Ring numbers and dimensions of metallic ring-joint gaskets3 Table 2 Dimensional tolerances6 Table 3 Surface texture of ring faces6 Table 4 Hardness values and material identification symbols for ring-joint gaskets6 Publications referred toInside back cover Licens

11、ed Copy: London South Bank University, London South Bank University, Fri Dec 08 11:29:00 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 7076-2:1989 ii BSI 06-1999 Foreword This British Standard has been prepared under the direction of the Piping Systems Components Standards Policy Committee and is pu

12、blished in four Parts. The other Parts of BS 7076 are as follows: Part 1: Specification for non-metallic flat gaskets; Part 3: Specification for non-metallic envelope gaskets; Part 4: Specification for corrugated, flat or grooved metallic and filled metallic gaskets for use with steel flanges. The p

13、ublication of this standard in all four Parts takes into account related international work being carried out by Subcommittee 10, Metallic flanges and their joints, of Technical Committee 5, Ferrous metal pipes and metallic fittings, of the International Organization for Standardization (ISO). On th

14、is basis the terminology in this standard is in accordance with that given in ISO standards. This Part of BS 7076 together with BS 7076-1, BS 7076-3 and BS 7076-4 supersede Appendix F of BS 1560-2:19701). A British Standard does not purport to include all the necessary provisions of a contract. User

15、s of British Standards are responsible for their correct 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 8, an inside back cover and a

16、back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover. 1) BS 1560-2:1970 is superseded by BS 1560-3.1. Licensed Copy: London South Bank University, London South Bank University

17、, Fri Dec 08 11:29:00 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 7076-2:1989 BSI 06-19991 1 Scope This Part of BS 7076 specifies the dimensions and marking of metallic ring-joint gaskets2) for use with steel flanges complying with BS 1560-3.1 for Class designations 150, 300, 600, 900 and 1 500 fo

18、r sizes up to and including 24, and for Class designation 2 500 for sizes up to and including 12. NOTE 1The titles of the publications referred to in this standard are listed on the inside back cover. NOTE 2Dimensions of other types of gaskets for use with flanges complying with BS 1560-3.1, BS 1560

19、-3.2 and BS 1560-3.3 are given in BS 3381 and BS 7076-1, BS 7076-3 and BS 7076-4 (see foreword). NOTE 3The materials for metallic ring-joint gaskets are outside the scope of this standard but guidance on typical materials and their hardnesses are given in Appendix A. NOTE 4Appendix B lists informati

20、on that should be supplied by the purchaser when ordering gaskets. 2 Gasket designs Metallic ring-joint gaskets for use with ring-joint (type J) flange facings complying with BS 1560-3.1 shall have a cross-sectional shape that is either oval or octagonal. NOTE 1Figure 1 shows a flange joint illustra

21、ting both oval and octagonal ring-joint gaskets. NOTE 2If the purchaser requires a ring-joint gasket with a particular cross-sectional shape, this requirement should be stated on the enquiry and/or order (see Appendix B). 3 Dimensions and tolerances 3.1 Metallic ring-joint gaskets shall have the dim

22、ensions as given in Table 1 and Figure 2. NOTEDimensions of grooves and gaskets are such that, when joints are assembled, the flanges are apart and the approximate distances that the flanges are apart for each Class designation are given in the appropriate table of BS 1560-3.1. 3.2 The tolerances gi

23、ven in Table 2 shall apply for dimensions (as shown in Figure 2). NOTEThe presence of a small forging fin, located so that it does not prevent the ring from seating properly in the groove, is acceptable. 4 Surface texture When compared by visual or tactile means with reference specimens, the surface

24、 texture of the 23 surfaces of octagonal gaskets and the contact faces of oval gaskets shall be as given in Table 3. NOTEIt is not intended that instrument measurements be taken on the faces themselves and the Ra and Rz values as defined in BS 1134 relate to the reference specimens. 2) When referrin

25、g to specific aspects of ring-joint gaskets, it is common practice to use the term “ring” instead of the full description and for the purposes of this Part of BS 7076 the term “ring” has been used, particularly when referring to dimensions. Figure 1 Details of metallic ring-joint gaskets as housed L

26、icensed Copy: London South Bank University, London South Bank University, Fri Dec 08 11:29:00 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 7076-2:1989 2 BSI 06-1999 5 Identification number Identification numbers, prefixed by the letter “R” and as given in Table 1, shall be assigned to metallic ring

27、-joint gaskets. 6 Marking The outer surface of each gasket shall be marked with the following information: a) the manufacturers name or trade mark; b) the gasket identification number prefixed by the letter “R” (see clause 5); c) the material identification. Where a material that is given in Table 4

28、 is used, the material identification symbol given shall be used. The application of marking shall not damage the contact faces or otherwise harmfully distort the gasket. NOTEGaskets may be labelled either individually or on the packaging containing the gasket(s) with the number of this British Stan

29、dard, i.e. BS 7076-23). 3) Marking BS 7076-2 on or in relation to a product represents a manufacturers declaration of conformity, i.e. a claim by or on behalf of the manufacturer that the product meets the requirements of the standard. The accuracy of the claim is therefore solely the responsibility

30、 of the person making the claim. Such a declaration is not to be confused with third party certification of conformity, which may also be desirable. Figure 2 Dimensions Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 11:29:00 GMT+00:00 2006, Uncontrolled Copy, (

31、c) BSI BS 7076-2:1989 BSI 06-19993 Table 1 Ring numbers and dimensions of metallic ring-joint gaskets Flange Class designationRing number Average pitch diameter of ring, P Width of ring, A Height of ringWidth on flat of octagonal ring, C 150300 and 600 9001 5002 500Oval, BOctagonal, H Nominal pipe s

32、ize mmmmmmmmmm R.1134.136.3511.119.534.32 R.1239.697.9414.2912.705.23 R.1342.867.9414.2912.705.23 R.1444.457.9414.2912.705.23 1R.1547.637.9414.2912.705.23 111R.1650.807.9414.2912.705.23 1R.1757.157.9414.2912.705.23 1111R.1860.337.9414.2912.705.23 1R.1965.097.9414.2912.705.23 111R.2068.267.9414.2912.

33、705.23 1R.2172.2311.1117.4615.887.75 2R.2282.557.9414.2912.705.23 21R.2382.5511.1117.4615.887.75 22R.2495.2511.1117.4615.887.75 2R.25101.607.9414.2912.705.23 22R.26101.6011.1117.4615.887.75 22R.27107.9511.1117.4615.887.75 2R.28111.1312.7019.0517.468.66 3R.29114.307.9414.2912.705.23 3aR.30117.4811.11

34、17.4615.887.75 3b3R.31123.8311.1117.4615.887.75 3R.32127.0012.7019.0517.468.66 a For ring joints with loose hubbed flanges for lapped pipe ends (code 115 flanges) only. b For flanges other than loose hubbed flanges for lapped pipe ends. Licensed Copy: London South Bank University, London South Bank

35、University, Fri Dec 08 11:29:00 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 7076-2:1989 4 BSI 06-1999 Table 1 Ring numbers and dimensions of metallic ring-joint gaskets Flange Class designationRing number Average pitch diameter of ring, P Width of ring, A Height of ringWidth on flat of octagonal r

36、ing, C 150300 and 600 9001 5002 500Oval, BOctagonal, H Nominal pipe size mmmmmmmmmm 3R.35136.5311.1117.4615.887.75 4R.36149.237.9414.2912.705.23 44R.37149.2311.1117.4615.887.75 4R.38157.1615.8822.2320.6410.49 4R.39161.9311.1117.4615.887.75 5R.40171.457.9414.2912.705.23 55R.41180.9811.1117.4615.887.7

37、5 5R.42190.5019.0525.4023.8112.32 6R.43193.687.9414.2912.705.23 5R.44193.6811.1117.4615.887.75 66R.45211.1411.1117.4615.887.75 6R.46211.1412.7019.0517.468.66 6R.47228.6019.0525.4023.8112.32 8R.48247.657.9414.2912.705,23 88R.49269.8811.1117.4615.887.75 8R.50269.8815.8822.2320.6410.49 8R.51279.4022.23

38、28.5826.9914.81 10R.52304.807.9414.2912.705.23 1010R.53323.8511.1117.4615.887.75 10R.54323.8515.8822.2320.6410.49 10R.55342.9028.5836.5134.9319.81 12R.56381.007.9414.2912.705.23 1212R.57381.0011.1117.4615.887.75 Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 11

39、:29:00 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 7076-2:1989 BSI 06-19995 Table 1 Ring numbers and dimensions of metallic ring-joint gaskets Flange Class designationRing number Average pitch diameter of ring, P Width of ring, A Height of ringWidth on flat of octagonal ring, C 150300 and 600 9001

40、 5002 500Oval, BOctagonal, H Nominal pipe size mmmmmmmmmm 12R.58381.0022.2328.5826.9914.81 14R.59396.887.9414.2912.705.23 12R.60406.4031.7539.6938.1022.33 14R.61419.1011.1117.4615.887.75 14R.62419.1015.8822.2320.6410.49 14R.63419.1025.4033.3431.7517.30 16R.64454.037.9414.2912.705.23 16R.65469.9011.1

41、117.4615.887.75 16R.66469.9015.8822.2320.6410.49 16R.67469.9028.5836.5134.9319.81 18R.68517.537.9414.2912.705.23 18R.69533.4011.1117.4615.887.75 18R.70533.4019.0525.4023.8112.32 18R.71533.4028.5836.5134.9319.81 20R.72558.807.9414.2912.705.23 20R.73584.2012.7019.0517.468.66 20R.74584.2019.0525.4023.8

42、112.32 20R.75584.2031.7539.6938.1022.33 24R.76673.107.9414.2912.705.23 24R.77692.1515.8822.2320.6410.49 24R.78692.1525.4033.3431.7517.30 24R.79692.1534.9344.4541.2824.82 Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 11:29:00 GMT+00:00 2006, Uncontrolled Copy,

43、(c) BSI BS 7076-2:1989 6 BSI 06-1999 Table 2 Dimensional tolerances Table 3 Surface texture of ring faces Table 4 Hardness values and material identification symbols for ring-joint gaskets SymbolDesignationTolerance PAverage pitch diameter of ring 0.18 mm AWidth of ring 0.20 mm B and HaHeight of rin

44、g 0.40 mm CWidth on flat of octagonal ring 0.20 mm Angle 23 0.5 R1Radius of ring 0.40 mm a A plus tolerance of 1.20 mm for B and H may apply provided the variation in the height of any given ring does not exceed 0.40 mm throughout its circumference. RaaRza 4m4m 1.6 6.3 a Defined in BS 1134. Metallic

45、 ring-joint gasket material Maximum hardness Identification symbol BrinellaRockwellb HBHRB Soft iron9056D Low-carbon steel12068S 4 % to 6 % chromium/ 0.5 % molybdenum steel 13072F5c Type 410 steeld17086S410 Type 304 steeld16083S304 Type 316 steeld16083S316 Type 321 steeld16083S321 Type 347 steeld160

46、83S347 Type 320e steeld16083S320e a Brinell hardness is measured with a 3 000 kg load except for soft iron, for which it is measured with a 500 kg load. b Rockwell hardness is measured with a 100 kg load and a 1.59 mm diameter ball. c F5 identification designates ASTM specification A182-72 chemical

47、composition requirements only. d This material is a stainless and heat-resisting steel and the number designation is included in various grade designations given in British Standards, e.g. BS 1449-2. e Attention is drawn to the fact that the related International standard, ISO 7438, continues for th

48、e time being to use the designation “316Ti”. Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 11:29:00 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 7076-2:1989 BSI 06-19997 Appendix A Gasket materials Typical materials used for the manufacture of metallic ring-joint gaskets are given in Table 4 together with their recommended maximum hardness values and identification symbols. The materials used should have a hardness value lower than the flange material to ensure tight joints. However, it may not be possible for t