Flat face and raised face
Flat face and raised face
(OP)
I've learned (or thought that I had learned) that it's O.K. to bolt a raised face piping flange to a flat face nozzle (on a centrifugal pump, for example) as long as the pump nozzle (casing, etc.) isn't made out of a metal that is easily cracked such as cast iron. Several major oil refineries have allowed this without any noticeable consequences. What are your thoughts on this?





RE: Flat face and raised face
If the nozzle fails it is because the piping exerted too much force and moment at the nozzle (which obviously is a zone of concentrated stress due to the discontinuity it represents).
HTH
Saludos
a.
RE: Flat face and raised face
The flat faced flange would need to be considered as working as a raised face. This may increase the stresses in the flat faced flange (potentially exceeding allowable stress or deflections: ie leaks).
Also a raised face gasket would be required, and you'd need to check the bolt-up requirements (may need a specific type of gasket to ensure reliable seal).
Regards,
RE: Flat face and raised face
Keep the wheels on the ground
Bob
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