3 replies to this topic

[Paktongkoi]

Dear Guys,
Recently one of my centrifugal compressor had both its seal oil pump trip. 1 hour after that the vibration at both ends has tremendously excited, and finally tripped the gas turbine due to compressor vibration.
Do you guys have any similar experience? Does the seal oil pressure loss had interrupt the rotor dynamics?

[Qalander (Chem)]

Dear Guys,
Recently one of my centrifugal compressor had both its seal oil pump trip. 1 hour after that the vibration at both ends has tremendously excited, and finally tripped the gas turbine due to compressor vibration.
Do you guys have any similar experience? Does the seal oil pressure loss had interrupt the rotor dynamics?

Dear Although your query is incomplete since service etc. undefined

However for large centrifugal compressor(s) Seal oil pressure maintaining proves extremely critical for rotor and over all system pressure balancing dynamic and can not be neglected.

Here the time delay seems excessive for system response If correctly recalled it is just a matter of few seconds/or maximum minutes when tripping interlocks operate to safeguard such machines.

Hope this still proves helpful?

[c2operator]

Hi dear,

This is terrible accident; how can the compressor working for "one hour" without seal oil system circulation, nevertheless with very long time vibration?

This will cause damages for your equipments, this is definitely UNSAFE...

Immediatly the compressor should be tripped systematicaly or manualy, while both of the seal oil pumps can not restart...

My advice to you dear to avoid this problem happen again, is to make a suggestion letter to make interlock on seal oil system pressure; thats mean if the pressure reading approach to the critical point then systematical will trip the compressor, and let what ever happen after that go flare or shutdown, the main thing is to not damage your equipment or but your out side operator live under threat...

regards,

[breizh]

Hi ,

As mentionned ,your equipment should have tripped very quickly ( a few secs after pump failure) . I would advise to review with your supplier your interlock system . Something is not correct there .

Breizh