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Again, when you write you need to tell us what you've done to troubleshoot the problem and what the results of the troubleshooting were. The Alarm List is a <b>MESS</b>. There are a bunch of Diagnostic Alarms at the top of the list (cleared prior to initiating a START), <b>but</b> how do we...

Whenever you post a problem to a site like this you should provide as much information as you have in order to receive the fastest and most concise reply, GE. (Hmmm.....) What have you done to try to troubleshoot the problem? And what were the results of your efforts? What is the Trip Oil...

The reasons for suiciding of servo-valve outputs are listed in the Toolbox Help files and the troubleshooting section of GEH-6421, the Mark VI System Guide. The descriptions, while not self-explanatory, do not include every contingency or auxiliary component. So they need to be reviewed in...

A major inspection is primarily a mechanical outage in which the gas turbine (and sometimes the generator if conditions warrant) are disassembled and inspected. Major mechanical and hot gas components are refurbished, replaced or repaired. Whilst the machine is shut down, very often the...

The power factor suddenly "drops". That is an incomplete statement in that you haven't said if it "drops" in the leading or lagging direction, or what the magnitude of the "drop" is (from 0.98 lagging to o.78 lagging, for example). You should also tell us what load (kw or MW) the unit is...

>help I repeat: What is the problem you are experiencing?

Couldn't a compressor which isn't flowing rated throughput be similar to a flow restriction? And when the bypass is closed that is trying to increase the flow through the compressor, and if the compressor can't handle the throughput (remember the suction side of the compressor is fed with...

There is a limit to the amount of misalignment a flexible coupling can "absorb." However, a problem with the accessory gear box output shaft could also be the problem. There's probably little which can be done to determine if a problem with the shaft is causing the couplings to fail without a...

If you have access to the Control Specification for your unit, I believe Sect. 09 has all the information you're looking for. I don't presently have access to a Mark V Control Spec. or I could provide more assistance. In my experience, the configuration you describe is unusual. If you're...

Still difficult to understand how the AA Precooler outlet temperature can change so drastically so quickly, it just doesn't seem possible unless there is an unusual combination of very cold cooling water <b>and</b> a greatly oversized cooler. What is the temperature of the cooling water...

Can you please describe the manufacturer and type of the turbine you are operating? Is the CV value changing during operation?

GTG, It's very difficult to relate Main AA Compressor inlet temperature differentials to AA pressure fluctuations on your Frame <b>6</b> GE-design heavy duty gas turbine. There is an air-actuated bypass valve around the Main AA Compressor on dual-fuel Frame 6B that is controlled by a...

By the way, you didn't mention if this was a Frame 9E or 9F/FA or .... There are Frame 9s and there are Frame 9s.

I have recently seen a similar problem on a site with multiple turbines that were all installed and commissioned at roughly the same time (within a couple of months of each other) that was ultimately traced to wiring problems during initial commissioning that caused the back-plane of the Mark VI...

Uneven flux distributions.

Presuming one of the units is operating on Isochronous control, the only thing you are changing is the turbine speed control reference, to "match" the infinite grid frequency (which is directly proportional to speed per the formula: F = (P * N)/120 or N = (120 * F)/P where, F =...

Did either of these broken quill shafts cause the coupling between the Accessory Gear Box Main Hydraulic Pump Output Shaft and the Main Hydraulic Pump input shaft to fail? Did either of these broken quill shafts cause the Main Hydraulic Pump to be incapable of producing sufficient Hydraulic...

Ahem, well, you said there were seven sensors, but you only listed six (6). Generally, there are two seismic (velocity) pick-ups on the Turbine #1 bearing, BB1 & BB2; one seismic (velocity) pick-up on the #2 Bearing drain piping, BB3, (it's too hot to put one in the Turbine #2 bearing area...

RY, Thanks for the feedback! What leads you to believe there is too much fuel?

The point at which two straight lines intersect each other is the point at which the functions of the two lines are equal to each other. In other words, for the same value of 'x' the 'y' values of the two lines ("segments") are equal to each other. GE calls each sloped line a "segment."...