ORIFICE FLANGES are widely used in conjunction with orifice meters for measuring the rate of flow of liquids and gases. They are basically the same as standard welding neck and slip-on flanges except for the provision of radial, tapped holes in the flange ring for meter connections and additional bolts to act as jack screws to facilitate separating the flanges for inspection or replacement of the orifice plate. In choosing the type of orifice flange, the considerations affecting the choice of welding neck and slip-on standard flanges apply with equal force

Materials

Carbon Steel:ASTM A105, A350 LF1,LF2 CL1/CL2 LF3 CL1/CL2, ASTM A694 F42,F46,F48,F50,F52,F56,F60,F65,F70
Stainless Steel:ASTM A182 F304/304L, F316/316L, F316H,F316Ti,F321,F44(UNS S31254)
Alloy Steel:ASTM A182 F1,F5/a,F9,F11,F12,F22,F91
Duplex&Super Duplex Steel:ASTM A182 F51/UNS S31803,F53/UNS S32750 F55/UNS S3260
Special Alloy Steel:Monel400,Inconel 600, Inconel 625, Inconel 800, Inconel 825