Hello Genius peoples,
Hope you're fine...

TURBINE SPECIFICATION:

GE 6-FA,MARK V,DLN 2 SYSTEM,LNG fired plant.
Now come to the problem...yesterday while starting our GT, The SRV valve starts Hunting, (NOTE - Other control valves primary, secondary, spliter valve are normal-GE make with MOOG valve control) But GT goes upto FSNL with SRV hunting continues. we check the hydraulic pressure are normal and its auxiliaries such as accumulator at normal condition. At last we found that some seal leakage problem in the actuator of SRV (Which is GE make with Moog control.

So we decided to change the actuator of SRV With another actuator (get spare from nearby plant) which is moog make actuator with moog control valve itself.

The question is our nearby plant is used same 6fa turbine with MNQC combustion System. Can we use that moog actuator for our DLN system?

thanks and regards,

 

jameelrahman,

I will answer a qualified yes.

For decades GE used a combined SRV/GCV assembly which was manufactured for GE by Young & Franklin. GE didn't make the valve, which they had a hand in designing--but it was made by Y&F.

Then, when DLN combustions systems came into prominence and the size of the turbines (and fuel flow-rates) increased, GE began using valves from various other manufacturers. A common SRV used on many Frame sizes was a Fisher Cam Vee-ball rotary SRV with an acuator supplied by the packager of the valve assembly. For a time, GE was buying skids and valves made by a Moog reseller, and most of the valves were actually made by other valve manufacturers and the actuators were made by other actuator maufacturers (Fisher; Woodward; etc.). But GE got out of the valve manufacturing business decades ago, and has been buying valves from various integrators that are using "off-the-shelf" actuators and valves. And many of the new Woodward control valves have the actuator built-in as in integral part of the control valve making it not replaceable.

An SRV is an SRV--and the fuel flow-rate for a 6FA is going to be roughly the same regardless of the type of combustion system, so if the actuator from the MNQC combustor-equipped unit's SRV will fit the DLN-2 combustor-equipped SRV, then it's probably okay.

What may change is the servo gain (not the null bias, but the servo current gain). You will also need to make sure that you use the proper servo-valve for the actuator (in other words, the servo-valve in use on the present SRV actuator may not be the proper servo-valve for the actuator from the other SRV). And, that, again, may entail changing the servo gain in the servo-valve output's regulator to match that for the MNQC combustor-equipped SRV servo-valve output's regulator.

Hope this helps!

 

Hi, yo'all

If the actuator has same physical dimensions and same actuator spring
characteristics, I don't foresee a problem, except the GT where you got
the actuator is now out of commission. How long before your replacement
part arrives?

Peter B Macalua
Port Arthur, Texas