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T&G Flange vs Standard RF Flange in Refridgeration

T&G Flange vs Standard RF Flange in Refridgeration

T&G Flange vs Standard RF Flange in Refridgeration

(OP)
I am replacing a heat exchanger used to condense Freon from a vapor to a liquid.  Shell rating is 300 psi at 200/20 deg F and tube side rating is 75 psi at 150/20 deg F.  Freon is on the shell side and cooling water on the tube side.  In reviewing the original design, a 6" 300# T&G CS flange is used on the shell side inlet and a 6" 300# Refrigeration FRICK flange on the outlet.  There are no documents in our file to explain why the two different types of flanges are being used.  With such moderate temperatures and pressures, I do not understand why a standard 300# RF flange can't be used on both ends.  Am I missing anything or is there a special requirement for the current flanges because of Freon?  Any ideas or comments??

RE: T&G Flange vs Standard RF Flange in Refridgeration

Doesn't make sense to me, although Ive never worked with refridgeration or freon....both above the DBTT and below anything near a temperature correction factor, relatively low temps and pressures as you say, especially for a 300# class.

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