RTJ flange is a facing type of ANSI (ASME) B16.5 flange norms, facing type also have flat face FF and raised face RF, RTJ flanges usually used in flange type of Blank, Socket Weld and welding neck flanges, and RTJ facing type usually used in high rating class like class 600 900 1500 and 2500, ANSI B16.5 flange standard is often see RTJ flange type.
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