BS 1560-3.2-1989 管道 阀门和管件用圆法兰(特定类别).钢、铸铁和铜合金法兰 第2节铸铁法兰规范 .pdf

BRITISH STANDARD BS 1560-3.2 1989 Circular flanges for pipes, valves and fittings Class designated Part 3 Steel, cast iron and copper alloy flanges Section 3.2 Specification for cast iron flanges UDC 621.643.41 621.643.41 – 034.1/.3 621.643.41 – 034.13 Licensed Copy Institute Of Technology Tallaght, Institute of Technology, Sun Jul 30 104518 BST 2006, Uncontrolled Copy, c BSI BS 1560-3.21989 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 30 March 1990 BSI 03-1999 First published as BS 1560-2, November 1970 First revision as BS 1560-3.2, March 1990 The following BSI references relate to the work on this standard Committee reference PSE/15 Draft for comment 87/75020 DC ISBN 0 580 17563 4 Committees responsible for this British Standard The preparation of this British Standard was entrusted by the Piping Systems Components Standards 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 Tube Fittings Association British Maritime Technology British Non-ferrous Metals Federation British Pump Manufacturers’ Association British Steel Industry British Valve and Actuator Manufacturers’ Association Ltd. Combustion Engineering Association Copper Development Association Department of Trade and Industry National 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 Institution of Mechanical Engineers Institution of Production Engineers Institution of Water and Environmental Management IWEM Water Authorities Association Amendments issued since publication Amd. No.Date of issueComments Licensed Copy Institute Of Technology Tallaght, Institute of Technology, Sun Jul 30 104518 BST 2006, Uncontrolled Copy, c BSI BS 1560-3.21989 BSI 03-1999i Contents Page Committees responsibleInside front cover Foreword ii 1Scope 1 2 Ranges of nominal sizes 1 3 Class designations and pressure/temperature ratings 1 4 Materials 1 5 Bolting1 6 Repairs 2 7 Dimensions 2 8 Flange facings 2 9 Facing finishes2 10 Spot facing or back facing of flanges2 11 Marking3 Appendix A Ination to be supplied by the purchaser 15 Appendix B Application and installation 15 Appendix C Use of metric bolting in lieu of inch bolting 15 Figure 1 Flange codes4 Figure 2 Flange facings types A and B 7 Figure 3 Dimensions of Class 125 and Class 150 flanges9 Figure 4 Dimensions of Class 250 and Class 300 flanges11 Table 1 Types of grey, malleable and ductile cast iron flanges 1 Table 2 Synoptic table for grey cast iron and malleable cast iron flanges5 Table 3 Synoptic table for ductile cast iron flanges6 Table 4 Materials7 Table 5 Surface finish of flange faces 7 Table 6 Facing dimensions 8 Table 7 Dimensions of Class 125 grey cast iron GI and malleable cast iron MI flanges and Class 150 ductile cast iron DI flanges 10 Table 8 Dimensions of Class 250 grey cast iron GI flanges and Class 300 ductile cast iron DI flanges 12 Table 9 Pressure/temperature ratings for grey cast iron and malleable cast iron flanges 13 Table 10 Pressure/temperature ratings for ductile cast iron flanges complying with grades 500-7 and 600-3 of BS 2789 and grade 420/5 of BS 477214 Table 11 Pressure/temperature ratings for ductile cast iron flanges complying with grades 400-18 and 420-12 of BS 2789 and grade 414-18 of ASTM A39514 Table 12 Bolting materials and temperature limitations 14 Table 13 Nominal bolt diameter 15 Table 14 Inch/metric bolt comparisons 15 Publications referred toInside back cover Licensed Copy Institute Of Technology Tallaght, Institute of Technology, Sun Jul 30 104518 BST 2006, Uncontrolled Copy, c BSI BS 1560-3.21989 ii BSI 03-1999 Foreword This Section of BS 1560 has been prepared under the direction of the Piping Systems Components Standards Policy Committee and constitutes a new Section of BS 1560 for Class designated cast iron flanges. For PN designated cast iron flanges, reference should be made to BS 4504-3.2. This Section of BS 1560 is related to ISO 7005-2 published by the International Organization for Standardization ISO in respect of flanges having nominal pressures PN 20 and PN 50 covered by the international standard. The types of flanges are identical to those flanges given in ISO 7005-2 but differences exist for some dimensions, pressure/temperature ratings and the ranges of nominal sizes. To align with the at of ISO 7005, BS 1560-3 is published in three Sections Section 3.1 Specification for steel flanges; Section 3.2 Specification for cast iron flanges; Section 3.3 Specification for copper alloy and composite flanges. British Standards for flanges once included details of Class 125 and Class 250 cast iron flanges which were used in the petroleum industry and which complied with BS 1575 and BS 1576. These standards have been with-drawn. Latterly, product standards have usually made reference to the applicable ANSI standards published by the American National Standards Institute, i.e. ANSI B16.1 or ANSI B16.42 from which this Section of BS 1560-3 has evolved via the ISO/TC 5/SC 10 work. The flanges specified in this Section of BS 1560 have compatible mating dimensions with steel flanges complying with BS 1560-3.1. Until such time as all 3 parts of ISO 7005 are published and this Section of BS 1560 is revised, this Section of BS 1560 specifies flanges having inch bolt sizes and bolt holes as specified in BS 1560-3.1. The principles adopted in the preparation of BS 1560-3.2 are in accordance with the following. a Dimensions, other than mating dimensions, are based on ISO 7005-2 for PN 20 Class 125 and Class 150 and PN 50 Class 250 and Class 300 flanges. The maximum size of flange specified in BS 1560-3.2 has been limited to 24 in DN 600 whereas ISO 7005-2 covers flanges up to 36 in DN 900. However, dimensions for flanges of sizes 1 in DN 25 up to and including 24 in DN 600 are in accordance with ISO 7005-2. In addition, in and in sizes have been included in this Section of BS 1560 for Class 125 integral flanges in grey cast iron and Class 150 integral flanges in ductile cast iron, neither of which is included in ISO 7005-2. The outside diameters of pipes for use with cast iron flanges are outside the scope of this Section of BS 1560 because diameters vary according to the of production. b Mating dimensions for bolt holes and bolt sizes are compatible with those given in BS 1560-3.1. c With the exception of those for ductile cast iron flanges complying with grades 500-7 and 600-3 of BS 2789 and grade 420/5 of BS 4772 see Table 10, pressure/temperature ratings are in accordance with ISO 7005-2. d Surface finish and spot facing or back facing are in accordance with ISO 7005-2 but, in addition, cast surfaces are permitted for flange faces. e Flanges have been additionally designated by code numbers to maintain harmonization with BS 4504-3.2 and BS 1560-3.1 which are based on the principles agreed internationally for designating flanges by type numbers. Guidance notes and recommendations have been included in an inatory appendix. Appendix B is not intended to be exhaustive. Licensed Copy Institute Of Technology Tallaght, Institute of Technology, Sun Jul 30 104518 BST 2006, Uncontrolled Copy, c BSI BS 1560-3.21989 BSI 03-1999iii The various gasket types, dimensions, design characteristics and materials are outside the scope of this standard. For dimensions of gaskets reference should be made to BS 7076-1 and BS 7076-3. This standard specifies inch bolting only and the use of metric bolting is outside the scope. However, for ination Appendix C gives the proposed metric bolt sizes to be used in lieu of the inch sizes specified. Users of metric bolting should note that bolt hole clearances will be reduced. Assessed capability. Users of this Section of BS 1560 are advised to consider the desirability of assessment and registration of a supplier’s quality systems against the appropriate Part of BS 5750 by a third party certification body. A British Standard does not purport to include all the necessary provisions of a contract. Users 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 to iv, pages 1 to 16, an inside back cover and a 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. Licensed Copy Institute Of Technology Tallaght, Institute of Technology, Sun Jul 30 104518 BST 2006, Uncontrolled Copy, c BSI iv blank Licensed Copy Institute Of Technology Tallaght, Institute of Technology, Sun Jul 30 104518 BST 2006, Uncontrolled Copy, c BSI BS 1560-3.21989 BSI 03-19991 1 Scope This Section of BS 1560 specifies requirements for circular grey and malleable cast iron flanges having Class 125 and Class 250 designations and ductile cast iron1 flanges having Class 150 and Class 300 designations. The flanges are in the range of nominal sizes in to 24 in and of the type given in Table 1. Table 1 Types of grey, malleable and ductile cast iron flanges This Section of BS 1560 specifies the types of cast iron flanges and their facings, dimensions, bolt sizes, flange face surface finish, marking, materials for bolting and flange materials together with their associated pressure/temperature ratings. NOTE 1To assist purchasers Appendix A lists ination which should be supplied when ordering flanges. NOTE 2Dimensional details of attachment for welded flanges of ductile cast iron code 212 and threaded flanges of grey and ductile cast iron code 213 attached to ductile and grey cast iron pipes to BS 4772 and BS 4622 see 7.1 and their routine inspection and pressure testing are outside the scope of this Section of BS 1560 but some guidance is given in Appendix B. NOTE 3The titles of the publications referred to in this standard are listed on page 17. 2 Ranges of nominal sizes The range of nominal sizes from in to 24 in applicable to each flange code and for each Class designation shall be as given in Table 2 and Table 3. 3 Class designations and pressure/temperature ratings 3.1 Class designations The range of Class designations of flanges shall be as follows a Class 125 grey cast iron; b Class 125 malleable cast iron; c Class 150 ductile cast iron; d Class 250 grey cast iron; e Class 300 ductile cast iron. NOTEClass 125 and Class 150 flanges have compatible mating dimensions as do Class 250 and Class 300 flanges. The Class designations used originate from related ANSI standards see foreword. 3.2 Pressure/temperature ratings The pressure/temperature ratings of flanges manufactured from the materials specified in Table 4 shall be as given in Table 9 for grey cast iron and malleable cast iron and Table 10 and Table 11 for ductile cast iron and shall be the maximum allowable non-shock working gauge pressure at the temperatures shown. NOTE 1Linear interpolation is permitted for immediate temperatures. The relevant pressures and temperatures are those of the fluid in the pipework system. NOTE 2The rating of flanges is not necessarily the rating of the whole pipework system. Gasket materials can also impose limitations on the pressure/temperature rating of a flanged joint and the gasket manufacturer should be consulted when selecting the material of the gasket. Bolting and temperature limitations on bolting shall be in accordance with Table 12. 3.3 Rating of flanged joints If two flanges in a flanged joint do not have the same pressure/temperature rating, the maximum permissible working pressure of the joint at any temperature shall not exceed the lower of the two flange ratings. 4 Materials Flanges shall be manufactured from the materials given in Table 4. 5 Bolting 5.1 Materials for bolting shall be in accordance with BS 1768, BS 1769 or BS 4882 inch as appropriate see Table 12 for grades and temperature limitations. Free cutting steels for bolts, studbolts and nuts shall not be used. NOTEFor joints comprising grey cast iron flanges with raised faces, and where grey cast iron flanges are bolted to flanges of other materials and either or both of the flanges have a raised face, it is recommended that bolting having a yield strength not exceeding 240 N/mm2 should be used. If higher strength bolting is used, it is recommended that the mating flanges should have flat faces and that full face gaskets, which extend to the outside diameter of the flanges, should be used. However, if Class 250 grey cast iron mating flanges have flat faces, they will not comply with this Section of BS 1560 in respect of the flange thickness. 5.2 Bolt sizes shall be as given in Table 7 and Table 8, as appropriate. 1 The term “iron” is generally used throughout industry instead of “cast iron”. For the purposes of this British Standard the two terms are considered to be synonymous. Code no.a Description 205Blank flange 212Hubbed slip-on flange for welding 213Hubbed threaded flange 215Loose hubbed flange for lapped pipe end 221Integral flange NOTE 1Figure 1 illustrates flanges according to description and code numbers. NOTE 2Flanges may be designated by description or code numbers. a Code numbers have been made non-consecutive to permit possible future additions. Licensed Copy Institute Of Technology Tallaght, Institute of Technology, Sun Jul 30 104518 BST 2006, Uncontrolled Copy, c BSI BS 1560-3.21989 2 BSI 03-1999 5.3 The dimensions and finish of hexagon-headed bolts with hexagon nuts shall comply with BS 1768, BS 1769 or BS 4882 inch as appropriate. 5.4 Studbolts with hexagon nuts shall comply with BS 4882 except that the shown in Figure 3 b of BS 48821973 shall apply only to studbolts of material other than alloy steel. 5.5 The mating surfaces of all bolt heads and nuts shall be full faced. 5.6 The dimensions of washers, when used, shall be in accordance with BS 3410. 6 Repairs Repairs by welding to ductile cast iron flanges shall be permitted unless otherwise prohibited by the applicable material standard. 7 Dimensions 7.1 Flange dimensions Flanges shall have the dimensions appropriate to their nominal sizes, types and Class designations as given in Table 6, Table 7 a