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1、AmericanWaterWorksAssociationANSI/AWWAC111/A21.11-95(RevisionofANSI/AWWAC111/A21.11-90)RAMERICANNATIONALSTANDARDFORRUBBER-GASKETJOINTSFORDUCTILE-IRONPRESSUREPIPEANDFITTINGSEffectivedate:Apr.1,1996.FirsteditionapprovedbyAWWABoardofDirectorsJuly16,1953.ThiseditionapprovedJun
2、e17,1995.ApprovedbyAmericanNationalStandardsInstituteFeb.16,1996.AMERICANWATERWORKSASSOCIATION6666WestQuincyAvenue,Denver,Colorado80235Copyright(C)1998AmericanWaterWorksAssociation,AllRightsReserved.AWWAStandardThisdocumentisanAmericanWaterWorksAssociation(AWWA)standard.It
3、isnotaspecification.AWWAstandardsdescribeminimumrequirementsanddonotcontainalloftheengineeringandadministrativeinformationnormallycontainedinspecifications.TheAWWAstandardsusuallycon-tainoptionsthatmustbeevaluatedbytheuserofthestandard.Untileachoptionalfeatureisspecifiedby
4、theuser,theproductorserviceisnotfullydefined.AWWApublicationofastandarddoesnotconstituteendorsementofanyproductorproducttype,nordoesAWWAtest,certify,orapproveanyproduct.TheuseofAWWAstandardsisentirelyvoluntary.AWWAstandardsareintendedtorepresentaconsensusofthewatersupplyin
5、dustrythattheproductdescribedwillprovidesatisfactoryservice.WhenAWWArevisesorwithdrawsthisstandard,anofficialnoticeofactionwillbeplacedonthefirstpageoftheclassifiedadvertisingsectionofJournalAWWA.TheactionbecomeseffectiveonthefirstdayofthemonthfollowingthemonthofJournalAWW
6、Apubli-cationoftheofficialnotice.AmericanNationalStandardAnAmericanNationalStandardimpliesaconsensusofthosesubstantiallyconcernedwithitsscopeandprovisions.AnAmericanNationalStandardisintendedasaguidetoaidthemanufacturer,theconsumer,andthegeneralpublic.TheexistenceofanAmeri
7、canNationalStandarddoesnotinanyrespectprecludeanyone,whetherthatpersonhasapprovedthestandardornot,frommanufactur-ing,marketing,purchasing,orusingproducts,processes,orproceduresnotconformingtothestan-dard.AmericanNationalStandardsaresubjecttoperiodicreview,andusersarecautio
8、nedtoobtainthelatesteditions.ProducersofgoodsmadeinconformitywithanAmericanNationalStan-d