Lube Oil System Aux pump delayed
Lube Oil System Aux pump delayed
(OP)
I have problem to analyze in petrochemical ethylene plant ,the problem with ethylene compressor RT-10 , when the operator turn main oil pump off MOLP or the pump goes off for any reasons the aux. ALOP pump delayed to takeover Feeding oil to the bearings in other words to pressurized the line to 9.5 kg/cms ,which dramatically caused total S/D to the RT-10 compressor , although the pump in auto- mode and pressure switch PZA1059-L activated normally at 8.4 kg/cms, my question how that happened and how I can start to investigate TO OVERCOME THE PROBLEM.





RE: Lube Oil System Aux pump delayed
Is the main oil pump driven off the compressor shaft? So if this pump goes off, the compressor is also shutting down anyway?
RE: Lube Oil System Aux pump delayed
thank you for response ,
the main pump driving by steam turbine
Ahmed
RE: Lube Oil System Aux pump delayed
RE: Lube Oil System Aux pump delayed
Ahmed
RE: Lube Oil System Aux pump delayed
One thought: Can the pressure switch (PZA1059-L) made such that is is activated at higher pressure than 8.4 kg/cm2, this as first attempt mitigation?
RE: Lube Oil System Aux pump delayed
Ahmed
RE: Lube Oil System Aux pump delayed
A process trip doesn't do the compressor any good either so might be am option?
Remember - More details = better answers
Also: If you get a response it's polite to respond to it.
RE: Lube Oil System Aux pump delayed
Another possibility is that the hydraulic bypass valve is opening when the ALOP starts, and it's slow to re-seat. This should be a truly modulating valve (e.g. Fulflo valve) that's specifically for lube oil skid service and not a conventional safety valve. A conventional PSV can cause this type of problem.
RE: Lube Oil System Aux pump delayed
Set it then at 8.9 kg/cm2, not big change but may buy you one or two seconds for auxiliary pump to come online. Maybe you could combine this with LittleInch's suggestion, all in all incremental improvements (and not very costly) ...