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Lube Oil Pump not building pressure

Sunday, February 05, 2017   By: Ahsan [2077] 0 Stars
Hi,
Suction Lube Oil pump Pump used for supplying Lube oil to MOP during startup does not build-up pressure some times. For this, we have to start/stop the pump a few times then pressure builds-up and remain normal until the pump remains in service. Pump has been dismantlement and checked several times but no abnormality was found in it. Turbine and lube oil system is of ANSALDO 210MW.
Have any one experienced similar problem? and what could be the reason for this problem?

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Wednesday, February 08, 2017   By: Ross B [390] 5 Stars
Very difficult to determine the exact cause of your loss of lube oil pump not building pressure on starting until after a small number of attempts. Since you have dismantled the lube oil pump a number of times without find the problem, then maybe we should think about the temperature of the lube oil in the sump. With the lube oil being too cold the lube oil will not flow into the suction as fast as the pump wants to pump until sufficiently heated. Someone may be turning on the electric immersion heater if provided moments before trying to start the lube oil pump. Just a thought.

Ross

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Wednesday, February 08, 2017   By: Ahsan [2077] 0 Stars
Thank you Ross for your response. One thing that I forgot to mention that the pump is submersible one, hence there should be no issue of suction. Also the temperature of the tank doesn’t vary much when unit is on load. Tank temp remains between 40*C and 50*C.

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Wednesday, February 08, 2017   By: Ross [390] 5 Stars
Thanks for the updated information on the lube oil pump startup conditions. Leaves us with the enviable conditions - 1 lube oil discharge piping is filled with air that cannot purge out readily at the pressure side of pump and likely discharging lube oil into the sump until it does, or 2...

Not knowing enough about the lube pump assembly and the piping system it is a guess on my part to identify the issue, but the lube oil pump is likely the issue or the lube oil system is the problem. I have confidence you will find it.

Ross

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Monday, February 20, 2017   By: Ahsan [2077] 0 Stars
Thanks Ross for your confidence on me and sorry for my late reply. We are still struggling to find the exact reason of the problem.


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Saturday, February 18, 2017   By: Jim Watts [764] 5 Stars
THere is almost certainly air in your pump or suction line.
Aerated oil is releasing gas during shutdown which accumulates until you burp it out during startups.

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Monday, February 20, 2017   By: Ahsan [2077] 0 Stars
Thanks Jim for your interest.
The pump is submersible one, as normally in lube oil systems of steam turbines. So, there should be no reason of air accumulation.

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Monday, February 20, 2017   By: Jim Watts [764] 5 Stars
The oil returning to the tank often comes back aerated or foamy and pumps ok during operation. On shutdown oil in the tank slows down and dearates. This can occur under a submerged suction line resulting in a pocket of air in the line.
Once a lube oil pump starts pumping the only thing that will stop it pumping is running out of oil. Other problems that prevent pressure build up will sort themselves out without needing to stop the pump. This is actually repriming it.

Your pump most likely has a horrizontal section in the suction which allows gas to accumulate in the top half.

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