1、ASME B16.3-2006(Revision of ASME B16.3-1998)Malleable IronThreadedFittingsClasses 150 and 300AN AMERICAN NATIONAL STANDARDThe American Society ofMechanical EngineersNot for ResaleASME B16.3-2006(Revision of ASME B16.3-1998)Malleable IronThreadedFittingsClasses 150 and 300AN AMERICAN NATIONAL STANDAR
2、DThe American Society ofMechanical EngineersThree Park Avenue.New York,NY 10016whAgNo roproduction or notworking permitled without liconso from IHSNot for ResaloCONTENTSForeword.ivCommittee Roster.Correspondence With the B16 Committee以11S00pe.。2 Pressure-Temperature Ratings.13Size.24Marking.25 Mater
3、ial.,.,.,.,.,26 Dimensions and Tolerances.27Threading.,.t38 Ribs39 Plugs,Bushings,and Locknuts310Face Bevel.311C0 atings,3Figures1 Identification of Reducing Fittings.22Gaging of Chamfered Internal Threads.3Tables1 Pressure-Temperature Ratings.42Inspection Tolerances.43Dimensions of Class 150,90-deg
4、 Elbows,Tees,and Crosses,and 45-deg Elbows(Straight Sizes).54Dimensions of Class 150,90-deg Elbows and Crosses(Reducing Sizes).6Dimensions of Class 150 Tees(Reducing Sizes).76Dimensions of Class 150,45-deg Y-Branches(Straight Sizes).87Dimensions of Class 150 Street Tees and 90-deg and 45-deg Street
5、Elbows.9Dimensions of Class 150 Couplings(Straight and Reducing Sizes).109Dimensions of Class 150 Caps.110Dimensions of Class 150,Closed-,Medium-,and Open-Pattern Return Bends.1211Dimensions of Class 300,90-deg Elbows,Tees,and Crosses,and 45-deg Elbows(Straight Sizes）1312Center-to-End Dimensions of
6、Class 300,90-deg Elbows(Reducing Sizes).133Center-to-End Dimensions of Class 300 Tees(Reducing Sizes).1414Dimensions of Class 300 Couplings.Dimensions of Class 300 Reducing Couplings.1616Dimensions of Class 300 Caps.117Dimensions of Class 300,90-deg and 45-deg Street Elbows.1818Dimensions of Class 3
7、00 Return Bends.18Mandatory AppendicesDimensions of Fittings in U.S.Customary Units.19References.,.,35Nonmandatory AppendixAQuality System Program.36进No roproduction or notworking permitled without liconso from IHSNot for ResaleFOREWORDIn 1921,the American Engineering Standards Committee,later the A
8、merican Standards Associa-tion(ASA)and currently the American National Standards Institute(ANSI),authorized theorganization of a Sectional Committee on the Standardization of Pipe Flanges and FlangedFittings,with the following organizations as joint sponsors:Heating,Piping,and Air ConditioningContra
9、ctors National Association(later the Mechanical Contractors Association of America,MCAA),Manufacturers Standardization Society of the Valves and Fittings Industry(MSS),andThe American Society of Mechanical Engineers(ASME).Threaded fittings were also included in the scope of the B16 Committee,and Sub
10、committeeNumber 2(now Subcommittee B)was made responsible for threaded fittings other than steel.The first edition of a standard covering malleable iron fittings,150 lb,was approved as AmericanTentative Standard by ASA in December 1927.In 1936,a revision was undertaken to add hydraulicservice rating
11、s,material specifications,alignment tolerances,and dimensions for additional sizes.It was approved with the designation American Standard B16c-1939.Pipe plugs,bushings,and locknuts,included in the first editions,are now covered in a separatestandard,B16.14.A revision begun in 1947 amplified the sect
12、ions on threading,inspection,and tolerances,andadded dimensions for additional sizes of elbows,reducing crosses,reducing tees,straight andreducing couplings,caps,and return bends.It was approved as ASA B16.3-1951.Meanwhile,MSS,in cooperation with the Association of American Railroads(AAR),developedt
13、he first standard for 300 Ib malleable iron threaded fittings,published as MSS SP-31 of 1932.The 1950 edition of SP-31,which agreed with AAR Purchase Specification M-404,was submittedto ASA Sectional Committee B16 and assigned to Subcommittee Number 2.After balloting,itwas approved as a separate sta
14、ndard,ASA B16.19-1951.Work was begun to combine the two standards(for 150 lb and 300 lb)into a single documentin 1961.The resulting Standard was approved as ASA B16.3-1963.Subsequent reviews of theStandard,leading to revisions approved as ANSI B16.3-1971 and ANSI B16.3-1977,involvedupdating referenc
15、ed standards and the introduction of metric(SI)dimensions and ratings.In the1977 edition,150 lb and 300 lb were redesignated as Class 150 and Class 300.In 1982,American National Standards Committee B16 became the ASME B16 Standards Com-mittee,operating with the same scope under ASME procedures accre
16、dited by ANSI.A furtherrevision of the standard,approved and published as ANSI/ASME B16.3-1985,provided forelectrodeposition as an alternative to hot dipping when zinc coating was required.The 1992 edition of B16.3 omits metric units,establishing U.S.customary units as the standard.Clarifications an
17、d editorial revisions were made in order to improve the text.Following approvalby the Standards Committee and ASME,the 1992 edition received approval as an AmericanNational Standard on December 2,1992,with the designation ASME B16.3-1992.In the 1998 edition of ASME B16.3,the References section was u
18、pdated;a Quality SystemProgram Annex was added;and several editorial revisions were made.Following approval byASME B16 Subcommittee B and B16 Main Committee,ANSI approved this American NationalStandard on November 20,1998.In this edition,metric dimensions have become the primary units and inch dimen
19、sions areincorporated into this standard as secondary units and shown in parentheses.The added metricdimensions constitute an independent but equal standard to the inch units.Following approvalby the Standards Committee and the ASME Board,this revision to the 1998 edition of thisstandard was approve
20、d as an American National Standard by ANSI on November 9,2006 withthe new designation,ASME B16.3-2006.Requests for interpretation and suggestions for revision should be sent to the Secretary,B16Committee,The American Society of Mechanical Engineers,Three Park Avenue,New York,NY10016-5990.No roproduction or notworking permitled without liconso from IHSNot for Resale
