1、FOREWORDAs early as the spring of 1921,the consolidation and further development of threaded andflanged fittings standards in force in this country seemed desirable.To meet this need,theAmerican Standards Association(ASA)now the American National Standards Institute(ANSI)authorized the organization
2、of a Sectional Committee on the Standardization of Pipe Flangesand Flanged Fittings(B16),with the Heating,Piping,and Air Conditioning ContractorsNationalAssociation(now known as the Mechanical Contractors Association of America),the Manufactur-ers Standardization Society of the Valve and Fittings In
3、dustry(MSS),and The American Societyof Mechanical Engineers acting as joint sponsors.In June 1927,the Manufacturers Standardization Society of the Valve and Fittings Industryappointed a committee on Nonferrous Screw Fittings for the purpose of developing standardsfor products commonly designated as
4、threaded pipe fittings of brass,bronze,or other nonferrousmaterials.At the time brass threaded fittings were furnished from a number of different patternswith wide variations in dimensions and weights.MSS SP-10 for 125 Ib Bronze Screwed Fittings and MSS SP-11 for 250 lb Bronze Screwed Fittingswere d
5、eveloped and adopted by the MSS in September 1930.The lighter fittings were patternedafter malleable iron threaded fittings,then standardized in ASA B16c,while the heavier productswere patterned after the cast iron threaded fittings covered by ASA B16d.Thus a practice wasstandardized that had been f
6、ound satisfactory in the valve and fittings industry over many years.Following the publication of revised editions in 1941 and 1943,SP-10 was submitted to Subcom-mittee No.2 of ASA Sectional Committee B16 for adoption as an American Standard.Finalapproval of that edition was granted on January 23,19
7、47 with the designation ASA B16.15.A reaffirmation of the Standard was granted in 1952 and a complete revision for updating theStandard was approved by ASA on March 25,1958.After revision in 1944,SP-11 was submitted to Subcommittee No.2 in August,1947 and ASAgranted the approval of B16.17 on April 6
8、,1949.In 1961,Subcommittee No.2 reviewed the two Standards and noted that the historical reasonfor their separate existence no longer applied.Accordingly,the two were combined into ASAB16.15 with final ASA approval granted on February 6,1964.In 1969,the document was reviewed by Subcommittee No.2 and
9、 minor changes were proposed.Final ANSI approval was granted on April 14,1971.In 1977,the MSS submitted a proposed revision to Subcommittee B(formerly No.2)for B16review and approval.Changes included the addition of metric(SI)units and editorial updating.ANSI granted final approval on December 4,197
10、8.In 1982,American National Standards Committee B16 was reorganized as the ASME B16Committee,operating under procedures accredited by ANSI.The revision,following regular5-year review by Subcommittee B,involved rationalization of metric equivalent dimensions andupdating of reference standards.Followi
11、ng approval within ASME,ANSI approval was grantedon July 30,1985 with the new designation ANSI/ASME B16.15-1985.In 1994,and again in 2004,the document was reaffirmed.In 2005,Subcommittee B of the ASME B16 Committee changed the title to Cast Copper AlloyThreaded Fittings,a section on leakage capacity
12、 was added,nominal size(DN)according toISO 6078 was addressed as SI values were positioned in the main text;U.S.Customary valueswere positioned in Appendix I.The reference for gaging internal fitting threads was made clearerby using the wording from ANSI/ASME B1.20.1(Pipe Threads-General Purpose-Inc
13、h).Many clarifying and editorial revisions were made in order to improve the text.After approvalby ASME,ANSI approval was granted on August 25,2006 with the new designation ofASME B16.15-2006.All requests for interpretations or suggestions for revisions should be sent to the Secretary B16,The American Society of Mechanical Engineers,Three Park Avenue,New York,N.Y.10016-5990.No roproduction or notworking permitled without liconso from IHSNot for Resale
