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BRITISHSTANDARDBSEN1759-1:2004Flangesandtheirjoints—Circularflangesforpipes,valves,fittingsandaccessories,Classdesignated—Part1:Steelflanges,NPS1/2to24TheEuropeanStandardEN1759-1:2004hasthestatusofaBritishStandardICS23.040.60����������������������������������������������������������������������LicensedCopy:InstituteOfTechnologyTallaght,InstituteofTechnology,MonApr0210:17:07GMT+00:002007,UncontrolledCopy,(c)BSIBSEN1759-1:2004ThisBritishStandardwaspublishedundertheauthorityoftheStandardsPolicyandStrategyCommitteeon30November2004©BSI30November2004ISBN0580449246NationalforewordThisBritishStandardistheofficialEnglishlanguageversionofEN1759-1:2004.ItsupersedesBS1560-3.1:1989whichiswithdrawn.TheUKparticipationinitspreparationwasentrustedtoTechnicalCommitteePSE/15,Flanges,whichhastheresponsibilityto:Alistoforganizationsrepresentedonthiscommitteecanbeobtainedonrequesttoitssecretary.Cross-referencesTheBritishStandardswhichimplementinternationalorEuropeanpublicationsreferredtointhisdocumentmaybefoundintheBSICatalogueunderthesectionentitled“InternationalStandardsCorrespondenceIndex”,orbyusingthe“Search”facilityoftheBSIElectronicCatalogueorofBritishStandardsOnline.Thispublicationdoesnotpurporttoincludeallthenecessaryprovisionsofacontract.Usersareresponsibleforitscorrectapplication.CompliancewithaBritishStandarddoesnotofitselfconferimmunityfromlegalobligations.—aidenquirerstounderstandthetext;—presenttotheresponsibleinternational/Europeancommitteeanyenquiriesontheinterpretation,orproposalsforchange,andkeeptheUKinterestsinformed;—monitorrelatedinternationalandEuropeandevelopmentsandpromulgatethemintheUK.SummaryofpagesThisdocumentcomprisesafrontcover,aninsidefrontcover,theENtitlepage,pages2to74,aninsidebackcoverandabackcover.TheBSIcopyrightnoticedisplayedinthisdocumentindicateswhenthedocumentwaslastissued.AmendmentsissuedsincepublicationAmd.No.DateCommentsLicensedCopy:InstituteOfTechnologyTallaght,In...