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Bob Johnston, There's no review of any of these functions by a team of experienced engineers and operators--except that if they shut the unit down (shutdown or trip) then it's likely the OEM or packager will get a call for service. I remember many years ago hearing a prominent Customer of...

When did this problem start? After a maintenance outage? After steam turbine control valve refurbishment? After some maintenance work was done in the DCS? TNR stands for Turbine Speed Reference. When the gas turbine is operating at Part Load in Droop Speed Control, the unit is loaded and...

Kamel, Torque is a function of fuel. When the generator breaker is open, increasing the fuel increases the torque which increases the speed. When the generator breaker is closed, increasing the fuel increases the torque. But, since the generator can't increase it's speed (because it's...

Kamel, A generator is a device for converting torque into amps. Wires are used to transmit those amperes (torque) to devices located long distances from sources of torque (or the energy used to produce that torque). Motors, and other devices that consume electricity (including lights, and...

Kamel, Other than "comparing" the proximitor 1x values to the seismic (accelerometer) readings, there is little of value for the typical operator--other than to observe some pattern or trend. And, that is really one of the most important parts of an operator's job: to spot increasing or...

To add to what otised said very well, that's a pretty interesting list of "interlocks". I've seen some units tripped by high wheelspace temperatures, but never one that went into an automatic shutdown on high wheelspace temperatures. Also, I've never seen a unit go into an automatic shutdown...

It would seem you are using an on-site gas chromatograph to measure some gas constituents? Are you certain of the calibration of the instrument? If there is doubt about the gas supply, then it would seem prudent to have a gas sample tested by an independent third party. That would also be...

Have you looked at where the two "pressure" taps for the compressor inlet DP sensor are in the inlet? In my estimation, if the high- and low-pressure taps for the compressor inlet DP sensor are DOWNSTREAM of the inlet filters, then the the compressor inlet DP sensor will not indicate dirty...

G.Rajesh, I may be very wrong, because the "Belfort Bunch" of GE quite frequently do things very differently from other divisions of GE. Why? Because they can. So they do. I've worked on several Frame 9FAs (early models that were built in the USA, though) and I'm pretty certain that the...

Kamel, Vibration analysis is considered to be something of both a science and an art. Meaning, that while some conditions can be quickly and obviously detected, others are very subtle and only the most experienced of individuals can look at the available data and discern what is or may be...

Vinu, You failed to mention when the increased hydrogen consumption started. After a maintenance outage? After a trip from load? After a period of increased generator or load coupling vibration? Seal Oil is intended to keep hydrogen from leaking out along the shaft of the machine. If...

Kamel, SO many questions! Let's begin at the beginning. A synchronous electrical machine (generator or motor) is intended to be operated at a constant speed (synchronous speed). When the generator rotor is rotated, the magnetic flux of the generator rotor induces a voltage in the generator...

Mark V, If your turbine-generators are synchronized to a large or infinite grid with other prime movers and their generators, then the frequency of the generator output at your site is completely a function of the grid frequency. <b>All</b> the turbine generators on a large or infinite...

mesi, Thanks you very much for the feedback. But, I'm <b>VERY</b> confused. Even more than usual. I have <b>NOT</b> seen EVERY configuration of IGV (Inlet Guide Vane) actuator provided on every GE-design heavy duty gas turbine, but I have never seen an IGV actuator with internal springs...

Kevin Arnold, It all depends on how the inputs are configured. Many turbine control systems used on GE turbines have a barometric (atmospheric) pressure transmitter (or multiple redundant transmitters) connected to the control panel, and the barometric pressure is added to the gage pressure...

There are some turbines with Mark VI and Mark VIe Speedtronic turbine control systems that connect proximitors directly to the Speedtronic, and with special versions of vibration input cards they can actually display phase angle and such on Toolbox and ToolboxST displays. Some of the F-class...

Never heard of this one. Can you provide more information? What kind of turbine? What kind of control system? When did this problem start? How long has this problem existed?

Bharat, This <b>seemingly</b> simple question does <b>not</b> have a simple answer. You need to be more specific about what it is you want to know. There are too many components and elements to provide you with a good answer to the question you asked. An electro-hydraulically controlled...

A cotton rag wetted (not soaked) with isopropyl alcohol seems to work best for any hydrocarbon-based grime; otherwise just plain water on a rag will work for most dirt. I believe the lens area is water-resistant, at a minimum, but it probably shouldn't be submerged.

A leaking hydraulic actuator piston seal would not be visible to the naked eye, nor would a worn hydraulic actuator cylinder wall. It's common for valves which are operated for long periods of time at one position to develop worn cylinder walls in that position and for hydraulic oil to leak past...