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1、BRITISH STANDARDBS 1560-3.2:1989Circular flanges for pipes, valves and fittings (Class designated) Part 3: Steel, cast iron and copper alloy flanges Section 3.2 Specification for cast iron flangesUDC 621.643.41 + 621.643.41 034.1/.3 + 621.643.41 034.13Licensed Copy: Institute Of Technology Tallaght,
2、 Institute of Technology, Sun Jul 30 10:45:18 BST 2006, Uncontrolled Copy, (c) BSIBS 1560-3.2:1989This 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 o
3、n30 March 1990 BSI 03-1999First published as BS 1560-2, November 1970First revision as BS 1560-3.2, March 1990The following BSI references relate to the work on this standard:Committee reference PSE/15Draft for comment 87/75020 DCISBN 0 580 17563 4Committees responsible for this British StandardThe
4、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 AssociationBritish Compressed Gases AssociationBritish Fluid
5、 Power AssociationBritish Foundry AssociationBritish Gas plcBritish Malleable Tube Fittings AssociationBritish Maritime TechnologyBritish Non-ferrous Metals FederationBritish Pump Manufacturers AssociationBritish Steel IndustryBritish Valve and Actuator Manufacturers Association Ltd.Combustion Engin
6、eering AssociationCopper Development AssociationDepartment of Trade and Industry (National Engineering Laboratory)Ductile Iron Producers AssociationElectricity Supply Industry in England and WalesEnergy Industries CouncilEngineering Equipment and Materials Users AssociationGAMBICA (BEAMA Ltd.)High P
7、ressure Pipework Consultative CommitteeInstitution of Gas EngineersInstitution of Mechanical EngineersInstitution of Production EngineersInstitution of Water and Environmental Management (IWEM)Water Authorities AssociationAmendments issued since publicationAmd. No.Date of issueCommentsLicensed Copy:
8、 Institute Of Technology Tallaght, Institute of Technology, Sun Jul 30 10:45:18 BST 2006, Uncontrolled Copy, (c) BSIBS 1560-3.2:1989 BSI 03-1999iContentsPageCommittees responsibleInside front coverForeword ii1Scope 12 Ranges of nominal sizes 13 Class designations and pressure/temperature ratings 14
9、Materials 15 Bolting16 Repairs 27 Dimensions 28 Flange facings 29 Facing finishes210 Spot facing or back facing of flanges211 Marking3Appendix A Information to be supplied by the purchaser 15Appendix B Application and installation 15Appendix C Use of metric bolting in lieu of inch bolting 15Figure 1
10、 Flange codes4Figure 2 Flange facings types A and B 7Figure 3 Dimensions of Class 125 and Class 150 flanges9Figure 4 Dimensions of Class 250 and Class 300 flanges11Table 1 Types of grey, malleable and ductile cast iron flanges 1Table 2 Synoptic table for grey cast iron and malleable cast iron flange
11、s5Table 3 Synoptic table for ductile cast iron flanges6Table 4 Materials7Table 5 Surface finish of flange faces 7Table 6 Facing dimensions 8Table 7 Dimensions of Class 125 grey cast iron (GI) and malleable cast iron (MI) flanges and Class 150 ductile cast iron (DI) flanges 10Table 8 Dimensions of Cl
12、ass 250 grey cast iron (GI) flanges and Class 300 ductile cast iron (DI) flanges 12Table 9 Pressure/temperature ratings for grey cast iron and malleable cast iron flanges 13Table 10 Pressure/temperature ratings for ductile castiron flanges complying with grades 500-7 and 600-3 of BS 2789 and grade 4
13、20/5 of BS 477214Table 11 Pressure/temperature ratings for ductile cast iron flanges complying with grades 400-18 and 420-12 of BS 2789and grade 414-18 of ASTM A39514Table 12 Bolting materials and temperature limitations 14Table 13 Nominal bolt diameter 15Table 14 Inch/metric bolt comparisons 15Publ
14、ications referred toInside back coverLicensed Copy: Institute Of Technology Tallaght, Institute of Technology, Sun Jul 30 10:45:18 BST 2006, Uncontrolled Copy, (c) BSIBS 1560-3.2:1989ii BSI 03-1999ForewordThis Section of BS 1560 has been prepared under the direction of the Piping Systems Components
15、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 (I
16、SO) 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
17、format 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 2
18、50 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
19、 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 Secti
20、on 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
21、 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
22、(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 u
23、se with cast iron flanges are outside the scope of this Section of BS 1560 because diameters vary according to the method 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 compl
24、ying 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) F
25、langes 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 informatory appendix. Appen
26、dix B is not intended to be exhaustive.Licensed Copy: Institute Of Technology Tallaght, Institute of Technology, Sun Jul 30 10:45:18 BST 2006, Uncontrolled Copy, (c) BSIBS 1560-3.2:1989 BSI 03-1999iiiThe various gasket types, dimensions, design characteristics and materials are outside the scope of
27、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 information Appendix C gives the proposed metric bolt sizes to be used in lieu of the inch sizes spe
28、cified. 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 suppliers quality systems against the appropriate Part of BS 5750 by a third party
29、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 pagesThis doc
30、ument 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 Cop
31、y: Institute Of Technology Tallaght, Institute of Technology, Sun Jul 30 10:45:18 BST 2006, Uncontrolled Copy, (c) BSIivblankLicensed Copy: Institute Of Technology Tallaght, Institute of Technology, Sun Jul 30 10:45:18 BST 2006, Uncontrolled Copy, (c) BSIBS 1560-3.2:1989 BSI 03-199911 ScopeThis Sect
32、ion 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.
33、Table 1 Types of grey, malleable and ductile cast iron flangesThis 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/temperatur
34、e ratings.NOTE 1To assist purchasers Appendix A lists information 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
35、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 sizesThe
36、 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 ratings3.1 Class designationsThe range of Class designations of flanges shall be as follows:a) Class 125 (grey
37、 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 relat
38、ed ANSI standards (see foreword).3.2 Pressure/temperature ratingsThe 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 m
39、aximum 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
40、 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 Ratin
41、g of flanged jointsIf 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 MaterialsFlanges shall be manufactured from the materials given in Ta
42、ble 4.5 Bolting5.1 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 raise
43、d 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 matin
44、g 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 s
45、hall 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.aDescription205Blank flange212Hubbed slip-on flange for welding213H
46、ubbed threaded flange215Loose hubbed flange for lapped pipe end221Integral flangeNOTE 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 additio
47、ns.Licensed Copy: Institute Of Technology Tallaght, Institute of Technology, Sun Jul 30 10:45:18 BST 2006, Uncontrolled Copy, (c) BSIBS 1560-3.2:19892 BSI 03-19995.3 The dimensions and finish of hexagon-headed bolts with hexagon nuts shall comply with BS 1768, BS 1769 or BS 4882 (inch) as appropriat
48、e.5.4 Studbolts with hexagon nuts shall comply with BS 4882 except that the form shown in Figure 3 b) of BS 4882:1973 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, shal
49、l be in accordance with BS 3410.6 RepairsRepairs by welding to ductile cast iron flanges shall be permitted unless otherwise prohibited by the applicable material standard.7 Dimensions7.1 Flange dimensionsFlanges shall have the dimensions appropriate to their nominal sizes, types and Class designati
50、ons as given in Table 6, Table 7 and Table 8 and as qualified by clause 10 and the notes to Table 7 and Table 8, if appropriate.NOTE 1Hub diameters (dimension N) are recommended minimum values within normal casting tolerances. Using larger N dimensions may require spot or back facing of flanges(see