BS-4504-Standard-Flange-Facings-Types-Welding-Ends-of-neck-flange参考标准规范

HEBEI HAIHAO GROUPISO.ABS.CE/PED APPROVEDMengcun,Cangzhou,Hebei,ChinaProfessional Steel Piping SolutionHAIHAO GROUPwww.haihaopiping.comEmail:sales@haihaogroup.comBS 4504 Circular Flanges-GeneralWeld Neck Flange-Welding Ends7 mm min7°mn3 mm min radius7 mm min,37.5°±2.545°mgx37.5°±2.545°max-7°max7°max20 mm1 mmIDIDWelding end for Wall Thickness (t)from 5 mm to Welding end for Wall Thickness(t)>22.2 mm22.2mmFlange Facings-BS 4504BS 4504 flange facing types A to H are defined below.The dimensions vary with pipe size (DN)and pressurerating(PN)as detailed in the following table.Type AType BType CType DFlat faceRaised faceTongue faceGroove faceType EType FType GType HSpigotRecess'O'Ring recess'O'Ring grooveh