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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.

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...

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...

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...

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...

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...

@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...

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...

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...

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...

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.

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...

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...

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...

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...

Hi, Yes- the pumps are gear pump with internal relief, and the pressure control is done via a pressure regulating valve. And yes, they are lifting from a reservoir. Summarizing the inputs including my own, i guess it's not normal for such dip. It could be due to 1. Gauge is faulty 2. Presence...

Hi, i would like to see if anyone experience following weird observation before. So it's about the lube oil pump of a blower, main one (shaft driven) and auxiliary one (separate motor driven). By logic, the aux pump needs to be running to get start permissive, and once the blower starts...

Hi i got this question from Hazop, what will happen to a recip compressor if the suction valve on the suction piping closed assuming spillback didnt work? My thought is that it will create a vacuum in the suction piping until no more gas particle can flow through the system, so eventually the...

Hi, wondering what's the usual convention to calculate specific speed for double suction impeller, whether to halve the flow or not? I am referring to Fraser's article on minimum flow that splits into two graphs depending on specific speed, but it didn't discuss on the convention he used to...

Apart from temperature limitation of the elastomer, is there any other aspect that we should be concerned?