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Dharmesh, When did this problem start? After a maintenance outage? After a gas fuel servo-valve was replaced and/or LVDTs were re-calibrated? The issue of primary zone re-ignition has been covered several times before on control.com. The basic causes of primary zone re-ignition are...

Ram, Well said!

I've also seen several sites where insulation from behind either exhaust transition duct plating, or from exhaust seals (not F-class units), had been pulled/blown out and was found to be obstructing the superheater tubing as well. On one site, some insulation from boiler side walls between the...

> I have read that adding moisture into air will make air lighter than cooling, > similarly as humid air will be lighter than dry air. Um, in my mind adding water or water vapour to air increases the weight of the air--at least on a per unit basis. Can you provide references to your reading...

I'm unclear about the measurements that were provided, too, but thank you, Roy Matson, for putting the measurements in tabular form. That should help the original poster. I always find it best to draw the configuration and put the dimensions on it for the best "picture" of the application...

Triads are usually twisted, shielded three wire (three conductor) cables. The twisting and shielding help to reduce the possiblity of voltages and currents being induced on the wires of the triad. (As with twisted, shielded pair instrumentation cables, the shield drain wire should be terminated...

Mark V, If you work at a site with a Mark V there should be a file in the unit-specific directory (F:\UNIT1, for example) called LONGNAME.DAT. That file should have some good information about signal names. Sometimes though, it doesn't have any information, and as is usually the case, the...

When did this problem start? After a maintenance outage? After a servo-valve replacement? After an LVDT calibration/re-calibration procedure? After the unit tripped from a high load? What have you done to troubleshoot the problem? What were the results of your troubleshooting? What fuel is...

Yes; you're wasting fuel by operating above nominal frequency. How much? That's a question I don't have the maths for the answer. Remember, the gas turbines are driving axial compressors and auxiliaries and their loads in addition to the generators and their loads. I don't know if it's so easily...

I've been thinking about this for several days, and I'd just like to point out the following. First, a 50 Hz system is supposed to be operated at 50 Hz. Sure, a little high or a little low doesn't hurt very much, but that's the intent of an AC system--to keep the frequency constant at the...

Hello, Zihni, (from Turkey, if I recall correctly) I just wanted to add a couple of things to MIKEVI's good explanation, to ensure your happiness. L3CP, which means "Customer Permissive to Start", is <b>usually</b> a logic signal driven by a discrete (contact) input. If it is, in fact, a...

It's not exactly clear what happened or the sequence of events. I'm presuming the unit was running (at what load we don't know; on what fuel we don't know; with what kind of combustors (conventions or DLN) we don't know) and tripped on what is being attributed to "loss" or re-boot of two...

Most GE-design heavy duty gas turbines use (nominal) 125 VDC batteries for more than just field flashing. They are typically used for powering the Speedtronic turbine control panel including 125 VDC solenoids powered through the Speedtronic panel, emergency DC lighting, and for powering any DC...

greenearth, Here are a couple of sites that came up when I typed "GE Energy Africa" (with quotation marks) into my preferred Internet search engine: http://www.ge-energy.com/solutions/regions/middle_east_and_africa.jsp http://www.ge.com/za/ (Remove any spaces inserted by the...

Mpac, Is the dongle for CIMPLICITY (Proficy), or for TCI?

I second Bob Peterson's remarks and suggestion. I'm also surprised to hear that the Jenbacher division of GE produces gas turbines. I thought they only produced large reciprocating engines (think large diesel engines). And, having the infrastructure to support generation is critical. I...

The English language can be a wonderful--and maddening--thing, sometimes at the same time. This is one of those questions that is best answered by referring to sales brochures and catalogues. Any manufacturer that wants to sell you something will explain their products and why their products...

William ananymous, You should not need the Acronis back-up unless something is done to corrupt or delete the data on the good hard drive--at least that's what I remember from the situation I observed a couple of years ago. It's my understanding that the purpose of the RAID configuration...

Sriram, 'Loss of Flame' occurs when a majority of the flame detectors fail to see flame <b>AND</b> there is no other trip condition detected which would cause the fuel to be shut off and flame to be lost. If there is no fuel, there is no flame. I don't have any P&IDs for a Frame 9FA at...

And what kind of "engine" would you use to increase the motor's speed? What would be the energy source for the "engine"? How would you arrange for the energy to be delivered to the "engine"? How would you control the energy being delivered to the "engine"?