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  1. chemicalengr

    High Pressure Centrifugal Pump Trip.

    MJCronin, "The discharge piping is rated for the pump discharge pressure." Sorry, that is just a mistake in my wording - the piping is indeed rated for the pump dead head pressure.
  2. chemicalengr

    High Pressure Centrifugal Pump Trip.

    Thanks for the advice. jistre, the proposed pump curves prior to rebuild showed head rising to shut off, but the FAT curves did not demonstrate the same phenomenon. The pumps have been purchased, therefore, starting over with new pumps is not possible. The pump rebuild was to provide higher...
  3. chemicalengr

    High Pressure Centrifugal Pump Trip.

    A recent centrifugal pump re-build left my client with pump curves (x3) that are "flat" at their lower flow range, to the point that the minimum stable flow is on the flat part of the curve. The pump may be required to periodically operate at the minimum flow, thereby making a high pressure...
  4. chemicalengr

    Accuracy of HYSYS Dynamic Depressuring Utility

    Does anyone have experience with modelling blowdown scenarios (BDV/RO) with the HYSYS dynamic depressuring utility? I am attempting to validate the model with an actual plant blowdown case, but the model is predicting a blowdown time of nearly 100% longer (6.3 min actual vs. 11.3 min model). I...
  5. chemicalengr

    ASME Section VIII Code Exclusions

    I am trying to determine whether a relief valve is required on a vessel due to planned pump upgrades. The pump motor and impeller upgrades in question will generate pressures only 5% greater than the vessel design pressure for the blocked outlet case. UG-140(b): "If the pressure is not...
  6. chemicalengr

    Pressurization of Compression Train

    dcasto, Where do your limits of Mach .9 or less and rate of pressure change come from? - literature, experience, ???
  7. chemicalengr

    Pressurization of Compression Train

    I'm working for a client who would like to increase the startup times of their compression trains. Currently, the trains are pressurized in stepwise manner from lowest to highest pressure, through restriction orifices installed in 2" bypass lines. The client would like to increase the size of...
  8. chemicalengr

    Utility connection to Oil/Water Separator

    Morten, My concern is protection of the N2 system. A RO will only limit the rate at which the N2 system could be subjected to overpressure. I'm considering recommending a removable spool (1" line) as this connection is only required periodically and this will eliminate the majority of the...
  9. chemicalengr

    Utility connection to Oil/Water Separator

    I am looking to provide a permanent piping connection from a nitrogen utility station to a high pressure separator for purging/pressurization purposes. Design pressure on the nitrogen system is 1400 kPag, while the separator system is designed for 4500 kPag. What protections are required on...

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