ASME_B16.33-2002.pdf

The American Society ofMechanical EngineersAN A ME RIC A N NATI ON A L ST AN DA R DMANUALLY OPERATEDMETALLIC GAS VALVES FORUSE IN GAS PIPING SYSTEMSUP TO 125 PS(SIZES NPS 1/2 THROUGH NPS 2)ASME B16.33-2002(Revision of ASME B16.33-1990CONTENTSForew0rd么Committee RosterviCorrespondence with the B16 Committee.vii1Scope.11.1General11.2Design11.3Standards and Specifications.1.4Quality Systems1.5Convention1.6Codes and Regulations.12Construction2.1General.12.2Tamper-Proof Features2.3Configuration22.4Marking22.5Lubrication(Sealant).23Materials,23.1Metallic Materials for Valve Parts.23.2Lubricants,Sealants,and Seating Materials.24Design Qualification24.1General24.2Gas Tightness。34.3Temperature Resistance4.4Structural Provision.44.5Flow Capacity55Production TestingFigure11Test Assembly4Tables1Materials for Metallic Valve Parts22Torque Values4Bending Moment Values.Tensile Load Values.55Maximum Turning Torque Values.56Minimum Gas Flows。AnnexesAReferences。4。44。9。044。4。4444444。4444446BQuality System Program.8iiiFOREWORDThe B16 Standards Committee was organized in the Spring of 1920 and held itsorganizational meeting on November 21 of that year.The group operated as a SectionalCommittee(later redesignated as a Standards Committee)under the authorization of theAmerican Engineering Standards Committee(subsequently named American Standards Associ-ation,United States of America Standards Institute,and now,American National StandardsInstitute).Sponsors for the group were The American Society of Mechanical Engineers,Manufacturers Standardization Society of the Valve Fittings Industry,and the Heatingand Piping Contractors National Association(later the Mechanical Contractors Associationof America).The American Gas Association determined that standardization of gas shut-off valvesused in distribution services was desirable and needed.The AGA Task Committee onStandards for Valves and Shut-Offs was formed,and development work commenced in1958.In 1968,it was determined that a more acceptable document would result if approvalwere gained from the American National Standards Institute and to facilitate such action,the AGA Committee became Subcommittee No.13 of the B16 activity.This Standard offers more performance requirements than has been customary in B16standards.It is expected that this will permit both manufacturers and users greater latitudein producing and using products made to this Standard.Work was agonizingly slow as the group gradually developed the document in the desiredformat.Its efforts were successful when,on July 18,1973,final approval was granted bythe institute.The revision incorporated some major revisions to the format.In addition,the scope ofthe standard was clarified so that the standard could be applicable to all manually operatedmetallic gas valves for use in gas piping standards up to 125 psig.The revised standardincorporated testing criteria for valves,which could have a specific pressure rating withinthis pressure range.This revision was made to clarify the fact that the standard is alsoapplicable to valves with service designations other than 60 psig and 125 psig.The revisionwas approved on February 10,1981.The 1990 revision deleted the sampling inspection table on the basis that the scopeclearly limited the standard to turning torque valves at the time of manufacture.This editionestablished U.S.customary units as the standard and metric equivalents were deleted.In 1982,American National Standards Committee B16 was recognized as an ASMECommittee operating under procedures accredited by ANSI.In 2002,a new materials section was added along with several other revisions.Alsoincorporated were metric values and a nonmandatory Quality System Program Annex.Useof these valves in higher rated systems is outside the scope of this Standard,and is neitherpermitted nor prohibited.ivFollowing approval by the ASME B16 Standards Committee,this revision to the 1990edition of this Standard was approved as an American National Standard by ANSI on May16.2002.All requests for interpretations or suggestions for revisions should be sent to the Secretary,B16 Committee,The American Society of Mechanical Engineers,Three Park Avenue,NewYork,N.Y.10016-5990.