Flange size or connection

I'm assuming you are refering to a spool piece to connect two pieces of prefabricated equipment with an interconnecting pipe for some type of process flow. Size diameter of the flanges is determined by the nominal pipe size of the connections. The 150# as refered to by the contractor denotes the pressure rating of the flanges. i.e. typically a 150# flange is a refered to a schedule 40 fitting or flange. The physical size of the flange is determined by the size (diameter) of the pipe being connected to the flange. A 150# (PSIG) flange can operate at pressures up to 150 PSIG. The next standard flange designation is Schedule 80 or 300 PSIG. Questions can be addressed to ggw@lmcic.com. Gary W.

The size of your flange is dictated by ansi standards. The sizes and press. class can be found in the ansi book of standards in the section dealing with pipe flanges or valve flanges. Likewise the size and press. class of nearly every flange is stamped on the o.d. of the flange. Now you need to know a few things like, number of holes, size of holes, i.d. of bore, o.d. of flange, thickness of flange. Is the face ring type (rtj) of raised face(rf). i hope this helps. Diamond d

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