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from the power department...
logics related to emergency lube oil pump , auxiliary lube oil pump & turning gear motor
Power generation equipment control. topic
Posted by dhruv on 24 July, 2009 - 3:59 pm
In our power plant there are 6 frame 9E gas turbine generator with mark-6.

can anybody explain the logics related to auxiliary lube oil pump, emergency lube oil pump & turning gear motor for frame 9E gas turbine controled by mark-6?

thanks very much in advance.


Posted by Aamir on 27 July, 2009 - 1:22 am
On GE systems logic 0 is used for both auxiliary & emergency lube oil pumps because this is fail safe condition, when there is a complete blackout auxiliary or emergency lube oil pump must run to jog the shaft.


Posted by CSA on 27 July, 2009 - 1:39 pm
Not every Frame 9E is equipped with the same cooldown mechanism (turning gear, ratchet, cooldown operation via torque converter, etc.).

When posting to a forum such as this, it's best to include as much information as you can for the most concise and quickest response. Please tell us about the type of cooldown mechanism in use, the type of control system in use, the type of generator (air- or hydrogen-cooled).

If you are having some kind of trouble with the cooldown system or the lube oil system, it would be helpful if you could tell us what the problems is you're experiencing and what you've done to try to troubleshoot the problem. If you have specific questions about the sequencing (which can be quite elaborate), please try to detail what you need to know.

There are at least three lubricating oil pump: the Main, accessory gear-driven, and the auxiliary, AC motor driven, and the emergency, DC motor-driven. If the units have hydrogen-cooled generators, they might have a Seal Oil Pump (sometimes two, or sometimes a single pump driven by either an AC or DC pump which are both coupled to the same pump). If there is a ratchet mechanism, there might be a Hydraulic Ratchet pump and motor (sometimes AC, sometimes DC). There might be a turning gear mechanism and Turning Gear motor. Lastly, there might be a "slowroll" cooldown method implemented via the starting means Torque Converter.

So, we just don't have enough information to be of help. I can tell you, that whenever the shaft is spinning there should be Lube Oil flowing to the bearings (and the hydrogen-cooled generator seals if so equipped). That oil might be coming from the Main Pump, or the Auxiliary Pump, or the Emergency L.O. Pump, depending on circumstances.

If the units were packaged by GE, you will have some System Descriptions in the unit Instruction Books provided with the units. You will need to read most of them to get an idea of how all the systems work together, but it's a good idea to read them all anyway.

Please help us to help you. It's a huge topic and we can try to help if you break it down to manageable chunks.


Posted by dhruv on 27 July, 2009 - 11:06 pm
Dear Sir,

in our frame 9e gt's cool down is done though turning gear motor by rotating the turbine shaft at 120 rpm though torque convertor. Generator rating is 155 mva and is totally enclosed water to air cooled generator.

My intense of asking this question is to know that, what will happen to normal running gt when gt mcc becomes dead due to some fault. All the drives though gt mcc fails. 125 v dc available though battery and only emergency lube oil pump. dc warren lube oil pump are available.

what will happen in this type of scenario.

so please explain me the logics related to auxiliary / emergency lube oil pump , turning gear motor and torque convertor.

Thanks & regards.


Posted by CSA on 30 July, 2009 - 1:06 am
This topic has been covered MANY times before. For a recent thread, see:

http://control.com/thread/1234745252#1234808286

Look, if you lose AC, there's not a lot that can be done, except to be patient.

Unless you want to install a large DC L.O. Pump and a DC turning gear motor, and a VERY large battery.


Posted by MOB on 31 July, 2009 - 4:50 am
AS usual, an excellent reply from CSA

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