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GE Frame 9e 48CR_ALM Alarm
Can any one give advice about L48CR_Alm?

Can any one assist, starting means turbine shaft fail to break away of frame 9e GE. Any advice. The L48CR_Alm is still standing.


NEWSFLASH: Every GE-design Frame 9E heavy duty gas turbine-generator is not like every other GE-design Frame 9E heavy duty gas turbine-generator.

What sets them apart from each other? Auxiliaries, including the type of starting means and cooldown mechanism (slow roll; turning gear; hydraulic ratchet; etc.), and the type of generator and the type of bearings used in the generator. And there are MANY auxiliaries, so there can be many differences--any one of which could make the difference when trying to help solve a problem such as this one.

All the GE-design Frame 9E heavy duty gas turbines and axial compressors are basically the same--they suck (draw air into the axial compressor), they squeeze (compress the air drawn into the axial compressor), they BURN (they add fuel to the compressed air and burn the fuel), and they blow (exhaust the combustion by-products). But the auxiliaries, including the type of generator and the type of generator bearings, the type of COOLDOWN scheme, the inlet air filters, the type of starting means and torque converter can all be different. So, we need to know A LOT more than you have told us to be of any useful help at all.

What is the text message for L48CR_ALM?

When did this problem occur? After a trip from load, when the compressor/turbine rotor was warm? Was the unit able to go on COOLDOWN, or not? How long was the unit at zero speed before a START was attempted?

What kind of starting means does the unit have? Specifically, what kind of torque converter is being used with the unit? Does the unit have a Torque Adjustor Drive mechanism? If so, what position was the Torque Adjustor Drive mechanism in during the START attempt?

Does the unit have a 20TU-1 solenoid, to pressurize and de-pressurize the torque converter? Was 20TU-1 energized and working during the START attempt?

Does the unit have turning gear, or slow-roll, or hydraulic ratchet COOLDOWN?

What was the L.O. temperature at the time of the START attempt?

Does the unit have an air-cooled generator, or a hydrogen-cooled generator? Some air-cooled generators require "bearing lift oil" or "jacking oil" at zero/low speeds in order to be able to spin the generator rotor with the starting means? If the unit has Bearing Lift Oil/Jacking Oil, what was the pressure of that particular oil system during the START attempt?

So, as you can see, there are several "auxiliaries" to the turbine and the various different auxiliaries can have different questions and possibilities.

The above questions should give you some things to examine while you keep trying to START the unit until it finally starts.

Please write back to let us know what you find--and if you need additional assistance, please provide all the answers to the questions above, even if you don't think the questions are relevant.