Feed pump Inlet Flange thickness

[RobertF]

Where could I find the minimum allowable thickness for a raised face flange for a boiler feedwater pump inlet. There is damage to the gasket seating area and it must be machined out. Is this ANSI or ASME scope?

 

[MJCronin]

Bob,

This is really a question for the pump vendor.....or sales rep

The required thickness of a pump flange is dependent on the casing material used as well as the maximum operating temperature used in the design of the pump.

Pump vendors typically design a flange to match the dimensional requirements of the adjoining piping (probably ANSI Class 150 or 300 in your case).....then they "add a margin" to the flange thickness and hydrostatically test to 1.5 times the deign pressure.

I know that this is a long answer.......but there is no calculation proceedure for such a situation

If this is an old pump, I would not hesitate to ask a competitive pump vendor this question.

Good luck....

MJC