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Gas Turbine Generator Starting System.

Gas Turbine Generator Starting System.

Gas Turbine Generator Starting System.

Hello everyone,

One of our gas turbines generator need the adjustement of an orifice manual valve (istalled at the bottom of solenoid

valve in the torque convertor oil circuit), however, this valve is never adjusted on the other turbines.

The opening/closing of the solenoid valves is controlled by the turbine logic control.

We adjust the valve in order to get the self sustained speed of the turbine main shaft, also avoiding

the starter moter get overloaded.

I wonder why the valve need an adjustement at each start up for this turbine.

Thank you

RE: Gas Turbine Generator Starting System.

What turbine? What manufacturer? What size turbine? What country?

have you called your district service agent?

RE: Gas Turbine Generator Starting System.

You need to regularly adjust / calibrate this valve. It is general recommended practice to calibrate this every scheduled inspection. Job normally done by control / instrumentation person.

RE: Gas Turbine Generator Starting System.

It's MS 5001D type one shaft.

Please note that this valves were never adjusted in the other turbines.

Thank you.

RE: Gas Turbine Generator Starting System.

Any possibility of shellac forming from the oil? We used to experience occasional problems with torque converters fitted to our Westinghouse / MHI machines where an internal shuttle would stick and oil would bleed past what should have been a closed port resulting in the machine failing to make cranking speed. When was the last time it was stripped to component level and cleaned?

RE: Gas Turbine Generator Starting System.

This is the basic troubleshooting I would do without knowing anything else:

1. Ensure the oil temperature is the same on all units, if the oil temperature is different in this particular unit the orifice will behave differently.

2. The orifice should have a set screw to keep it in position, make sure it is locked in position - mark the position with nail polish to confirm it moves from the position it was set to.


a. If the oil temperature is not the same (+/- 2°C) troubleshoot that problem: heaters on? difference in cooling water system?

b. If the orifice cannot be adjusted, change the device

c. If the orifice maintains the adjustment, exchange the orifice to another MS5001D and confirm that the problem follows the orifice.


RE: Gas Turbine Generator Starting System.

It seems likely that the orifice is being adjusted to compensate for some problem elsewhere. Personally I wouldn't bother moving an orifice among machines - the only thing it can realistically do is wear due to either extreme flow velocity or abrasive media, and both of those should be immediately visible.

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