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(2") FNPT , Galvanized coupling is available in Class125FF,GalvCS viz. threaded spec as A197 (300 #) & A105 (3000#).Which rating should we use & why?
Sachin,
You have not given enough information for anybody to use as a basis for a proper answer.
What is the commodity?
What is the operation pressure and temperature?
What is the other piping material (Pipe, fittings, valves, etc.) that is being used?