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  1. centeng11

    Dry Gas Seals

    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...
  2. centeng11

    Dry Gas Seals

    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...
  3. centeng11

    Mech'l Running Test of multistage Cent Comp as per API 617

    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...
  4. centeng11

    Centrifugal Compressor Curves - variation due to MW, Ts, Ps

    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.
  5. centeng11

    ASME PTC10-1997 / API 617

    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...
  6. centeng11

    Centrifugal Compressor Curves - variation due to MW, Ts, Ps

    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...

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