SLIP-ON FLANGES continue to be preferred to welding neck flanges by many users on account of their initially lower cost, the reduced accuracy required in cutting the pipe to length, and the somewhat greater ease of alignment of the assembly; however their final installed cost is probably not much, if any, less than that of welding neck flanges. Their calculated strength under internal pressure is approximately two-thirds that of welding neck flanges, and their life under fatigue is about one-third that of the latter. For these reasons, slip-on flanges are limited to sizes ? to 2 ? in the 1500 lb standard and are not shown in the 2500lb standard.
Classes 150-2500
Class 150
Class 300
Class 600
Class 900
Class 1500
Class 2500


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