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Recent content by Wkcoo

  1. Wkcoo

    Can sleeve be polished by oil ring?

    To Artisi, to use a fixed flinger in the bearing housing, does the bearing housing design needs to be changed as well? Current bearing housing internal does not have any feature to direct the oil.
  2. Wkcoo

    Can sleeve be polished by oil ring?

    To electricpete, we are still looking for any other potential mechanism causing the thrust bearing high temperature and darkened oil. If the shaft finish is trusted to be the only cause, then it's probably a very unique case that the oil ring is so sensitive with the surface finish. Otherwise we...
  3. Wkcoo

    Can sleeve be polished by oil ring?

    Thanks @lucky-guesser, I need to recalibrate my understanding that the harder material will not wear. I manage to find out a tribology study where a steel ball is rubbed against a bronze piece, some material transfer from the ball to the bronze piece is observed. I actually have another...
  4. Wkcoo

    Bronze oil ring polishing out shaft / sleeve?

    Hi all, recently I saw a case of pump thrust bearing high temperature and lube oil turning black in a between bearing pump. This uses oil ring lubrication (bronze oil ring placed on a carbon steel shaft sleeve) and the lube oil analysis shows presence of copper alloy particles, so it is evident...
  5. Wkcoo

    Can sleeve be polished by oil ring?

    Hi all, recently I saw a case of pump thrust bearing high temperature and lube oil turning black in a between bearing pump. This uses oil ring lubrication (bronze oil ring placed on a carbon steel shaft sleeve) and the lube oil analysis shows presence of copper alloy particles, so it is evident...
  6. Wkcoo

    Remnant speed after GP steam turbine trip valve closes

    Hi community, would like to find out more about your experience about how much remnant speed is acceptable after GP steam turbine trip valve closes. As an example, the steam turbine does not stop completely due to trip valve has leakage or the trip valve is not a tight shut design. Any rule of...
  7. Wkcoo

    Metal jacketed gasket overcompression

    @TugboatRng, I understand the part for O-ring it is sort of elastic to recover its shape, so it is always sealing when there is metal to metal contact between the flat and the grooved surface. For metal jacketed gasket, does it have the same resilience to always seal even when metal to metal...
  8. Wkcoo

    Metal jacketed gasket overcompression

    Hi all, I have some doubt about metal jacketed gasket, whether it will lose sealing if compressed until flush with the gasket groove. The gasket (SS+graphite) is installed not in piping but in recip compressor rod packing as the end gasket. The configuration is a groove surface sealing against a...
  9. Wkcoo

    torsional vibration: how to generate lumped parameter model?

    Hi all, I am trying to learn Holzer method to do a quick estimation on the torsional natural frequency of the compressor train (motor, gearbox & dry screw compressor). I am unsure how to generate the lumped parameter model itself from the compressor train, e.g. treatment of shaft inertia, rotor...
  10. Wkcoo

    Chemical filter consideration for instrument air compressor

    Does anybody have experience in design consideration when specifying chemical filter (for h2S,SO2 removal) is required for integral gear instrument air compressor? Have a integral gear instrument air compressor with 17-4PH impellers (3-stage with intercoolers) which takes suction from...
  11. Wkcoo

    Repeated Start-ups of Centrifugal Compressor Operating above Frist Critical Speed

    You can consider the seal & past experience of startup behaviour of the machine train as well. Seen a rock solid steam turbine driven centrifugal compressor, the vibration amplitude remain low even when it is surging on startup.
  12. Wkcoo

    Effect of keyed coupling hub radial force on pump bearing sizing

    Hi all, would like to learn if the radial load that arises from keyed coupling hub on pump shaft is significant enough to be accounted into pump bearing sizing. My understanding is coupling hub on a general centrifugal pump shaft usually has around half mil clearance fit, so I assume the torque...
  13. Wkcoo

    Pump suction strainer dilemma

    my situation is similar to what TiCI4 describe. Centrifugal pump in oil and gas refinery setting. Typical particles can be corrosion particles (can range from smaller than 1mm to as big as 3mm) in size, or some congealing service. The congealing is at least "solvable" in my unit by steam...
  14. Wkcoo

    Pump suction strainer dilemma

    Hi all, how do you resolve frequent seal failure / pump seizure due to particle presence in the product? I am thinking about reducing mesh size of the pump suction strainer, but am worried about the operability (technicians would not be happy to clean the plugged strainer frequently). A seal...
  15. Wkcoo

    Acceleration head loss of flexible hose

    Hi all, regarding diaphragm pump suction acceleration head loss, the estimated formula is Ha=LVNC/gK. Does this formula apply to flexible hose as well? A vendor is supplying a temporary pump skid for chemical injection, and suction piping is made of 10m long 1" dia. steel braided flexible hose...
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