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Recent content by georgeverghese

  1. georgeverghese

    Burst disc filling flare KO Drum

    That is a pain for the operators to have to live with a BD here. Use a reverse buckling BD if you must.
  2. georgeverghese

    Burst disc filling flare KO Drum

    This concern you have seems to be valid, but the root concern is the BD reliability. You need at least 20% margin on pressure between max operating pressure and BD setpoint. The API suggestion for BD is only for the case when overpressure source pressure >1000psig or so. Even then I would much...
  3. georgeverghese

    Compressor Flow Rate

    Find the answer in the performance curves for this compressor. In some cases, some flow may be recycled back to suction in order to maintain discharge pressure of 20barg. In a well designed system, the compressor would have been designed to handle full recycle at max speed. In some plants, the...
  4. georgeverghese

    Burst disc filling flare KO Drum

    Since you have a check valve on the downstream side S/T exchanger - heating medium side, reverse flow from the expansion drum cannot occur. It will be forward flow through the pump and the SDV (which has failed to close?). Strange you have a unreliable BD - it should be replaced with a spring...
  5. georgeverghese

    gauge pressure

    A control valve on this steam supply line may most likely be required to modulate this steam booster to keep the primary stream at its control setpoint, so make some allowance for control valve dp also
  6. georgeverghese

    Standard Flow rate at an oil terminal for gasoline and diesel

    Looking up some old threads on this website, suitable references on this topic are API 2003 and NFPA 77
  7. georgeverghese

    Shellside Fluid Velocity - Heat Exchanger Design

    Min baffle spacing is D/5, where D = shell dia. I'd suggest also using up to 70% of the available shellside pressure drop in order to maximise shellside htc.
  8. georgeverghese

    Standard Flow rate at an oil terminal for gasoline and diesel

    Max permissible velocity limits in piping / loading arms apply to hydrocarbon liquids when electrical conductivity is < 50pS/m to minimise static electricity generation during loading / off loading operations. A process safety engineer would know which API / IEC / NFPA guideline has these...
  9. georgeverghese

    pumped flow creating negative pressures to eliminate small pump

    Pumped leachate injection should be top entry into the main, so that waste water solids dont accumulate / reverse flow in this leachate line and bung up the check valve.
  10. georgeverghese

    Cooling mixing tanks with a chiller, selecting chiller size

    See Fig 11-47 and 11-48 in Perry Chem Engg Handbook - 7th edition, for aerial fin fan coolers operating with cold air feed - I'd go for the external recirculation style unit for your winter application to work in series with the chiller (which would be OFF during winter).
  11. georgeverghese

    Air India 787 crashes on take off

    You know there's something amiss when the granny news channels tell you some one committed suicide or when that White Helmets founder slipped off the balcony at a high rise apartment in Istanbul, or when they tell you Jeffrey Epstein hung himself in his cell at the Manhattan Corrections Centre...
  12. georgeverghese

    Cooling mixing tanks with a chiller, selecting chiller size

    Try working on a centralised closed loop chilled inhibited demin water system, cooled with say a lithium bromide based chiller (which could run off waste heat if you have it), and feed each of the jackets through its own temp - flow controller. Ask a senior process engineer to help out or put...
  13. georgeverghese

    Pumps with VFDs

    Agreed the speed on the titlehead on the pump curves does not match the nameplate speed. Agreed, the symbology used on the pump curves is not clear. What you need is pump curves for a given pump (RPK 80-200) at various speeds, while the pump curve you've posted is for various impeller...
  14. georgeverghese

    Cooling mixing tanks with a chiller, selecting chiller size

    Also hi depends on cream - water ratio
  15. georgeverghese

    Cooling mixing tanks with a chiller, selecting chiller size

    Though there are expressions in Perry and Kern for this unsteady state heat transfer operation during cooldown, the difficulty here in using these expressions is the estimation for the overall U, which consists of subcomponents as follows from what I see, given your description: a) the heat...
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