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  • Users: steveb1111
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  1. steveb1111

    Compressor hot gas bypass check valves

    We are installing a hot gas bypass to protect centrifugal compressor from surge following ESD. The design includes two 24-inch check valves immediately downstream of the bypass line to minimise the compressor discharge volume that needs to be depressured. The required opening time of the bypass...
  2. steveb1111

    Ice Formation in PSV tailpipes

    The possibility of ice formation in the flare system when high pressure wet gas stream from a separator is relieved to flare looks very high. If two-phase relief flow including the free water is considered, the situation looks even worse. Does anyone know thow these scenarios are mitigated...
  3. steveb1111

    Ice Formation in PSV tailpipe

    The possibility of ice formation in the flare system when high pressure wet gas stream from a separator is relieved to flare looks high. If two-phase relief flow including the free water is considered, the situation looks worse. Does anyone know thow these scenarios are mitigated against? I...
  4. steveb1111

    Flare Radiation

    The crane cab is cited as one of the positions critical with respect to flare radiation. Should credit be taken if cab is air conditioned? If so, how do we factor A/C into the radiant heat predictions.
  5. steveb1111

    Backpressure correction for balanced bellows

    We have 2 identical balanced bellows type PSVs. PSV A is set at 9.5 barg and PSV B 10 barg. They both protect the same equipment which has a 10 barg design pressure. PSV A has a 16% overpressure, PSV B has 10% overpressure. Each PSV has a backpressure of 4 barg. When I refer to API 520, Figure...
  6. steveb1111

    Losses through Tee Run when Branch is blanked.

    On a 2-inch inlet line to a PSV we have an installed Tee fitting with a blanked vent valve taken off the Tee branch. The equivalent length of a Straight through Tee is dominating the friction losses in the PSV inlet line generating losses exceeding API 3% guideline. If there is no flow to or...
  7. steveb1111

    PSV Outlet Flange Size

    When we run several of our PSVs in Flarenet we get mach one at the PSV outlet flanges. Does this mean these flanges are undersized? In some cases we need to go up two sizes to avoid sonic.
  8. steveb1111

    Tailpipe Mach Number

    Can the Mach number be allowed to reach 1.0 in the PSV disposal system piping?
  9. steveb1111

    Compressor Dry Gas Seal

    Hello, I'm trying to determine the consequences to the DGS system in the event of a compressor blowdown. If using the compressor gas a source for DGS, is the seal is lost? Further, the potential for low blowdown temperatures may give rise to liquid formation and possible damage to the DGS...
  10. steveb1111

    NPSH required for water

    We have vendor pump curve that report NPSH required in feet of water, which I understand is the norm. The fluid being pumped is pentane. Given the differences in vapour pressures and densities between pentane and water, using NPSHr for water surely can't be right. The NPSH available has been...
  11. steveb1111

    correct control valve location

    A bubble point liquid feed from a separator is preheated in an exchanger before entering a stabilizer tower. There is a control valve in the feed line where pressure is letdown from separator pressure (20 bar) to stabilizer pressure (8 bar). Should the control valve be located upstream or...
  12. steveb1111

    control valve location

    As a rule of thumb, for a A bubble point liquid feed from a separator is preheated in an exchanger before entering a stabilizer tower. There is a control valve in the feed line where pressure is letdown from separator pressure (20 bar) to stabilizer pressure (8 bar). Should the control valve...
  13. steveb1111

    Compressor Suction Relief

    Should compressor suction drum relief valve always be checked/sized for compressor recycle valve failing open scenario.

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