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Thanks for clarifying Johnny. So, my understanding, correct me if I'm wrong, is that despite the low flow across the primary seal faces, the sealing pressure is higher than the buffer gas, which in turn must be higher than the gas on the process side of the compressor; resulting in the net gas...

I'm slowly learning more about dry gas seals and I'm hoping someone out there can help me with a question that keeps bugging me. Focusing on double dry gas seals for the moment, the N2 sealing gas pressure must be higher than the buffer (process) gas being injected into the inner chamber...

Mechanical run tests are not required to be carried out under vacuum. Mechanical run tests in a vacuum can create problems, for example, the operation of oil-film type seals cannot be tested (if applicable), the lack of significant gas density can influence rotor dynamics, and even the casing...

I am very suprised that I never got a response to my post above considering that it forms the fundamentals of compressor design any engineer involved in the field should know. Anyway, I figured it out in the meantime.

Is it a type 1 or 2 test? If type 2, I would suggest that you obtain from the supplier as a minimum the performance curve they are testing to using the test gas. Generally the supplier should have calculated the curve using this test gas so as to closely match the performance if using your...

I have a query regarding centrifugal compressor curves that is starting to drive me a bit crazy; make that very crazy. According to the polytropic head equation, at the suction of the compressor, an increase in gas molecular weight (MW) will cause a subsequent decrease in the polytropic head...