STD.ASME B16.47-ENGL199b07596700579156631ASME B16.47-1996(Revision of ASME B16.47-1990)LARG旺DIAMETERSTEEL FLANGESNPS 26 Through NPS 60AN AMERICAN NATIONAL STANDARDThe American Society ofMechanical EngineersCOPKRTEHT American Seciety of Mechandcal EngineersLicensod by Information Handiing Sosvicos