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...
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...
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...
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, 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...
Hi all, just wondering how do we rerate pump casing design temperature? (Say design is 150F, but wanna rerate it to 200F)
For pressure, we can perform hydrotest at 1.5x the new pressure to determine. What about temperature?
Could slightly higher purge mist pressure cause bearing housing sump oil to flow out of laby seal, and thus depleting the oiler cup level of idle pumps? has anyone encountered such situation before?
Design mist manifold pressure: 0.6psig
Current pressure: 0.9psig
Hi alarm: 1.0 psig
I face this...
Does affinity law for pump hold equally well for open type and semi open type impeller (compared to enclosed type, which gives quite accurate prediction)?
Hi, just checking with the community if anyone has any experience with random crosshead vibration for recip compressor.
It's a two stage machine, however the first stage crosshead vibration will randomly spike above 20m/s^2 then come back down again.
It's just been overhauled last year but the...
OEM Performance curve for centrifugal compressor is for one specific suction condition. How do we calculate or predict the performance from the OEM curve if given another set of suction condition? Pumps have affinity law and viscosity correction which can give fairly accurate prediction, but I...
For a H2 recip compressor with packing vent to atmosphere arrangement, gas can be seen from the vent upon compressor running. Is this normal? How do we usually quantify whether the packing is leaking excessively? I was told if the vent temperature hits 80% of gas discharge temperature then it...
When pumping high viscosity fluid, the corrected BEP shifts to the left. Does this mean the MCSF of my pump will shift to the left also when I am pumping higher viscosity liquid?
Hi, i would like to propose drilling a hole in the check valves to warm up my pumps. I want to perform some calculations on hole size and whether my pumps will reverse overspeed, but not sure what references there are. Any input is appreciated :)
