Search results

6bturbinetech, There should <b><i>NEVER</b></i> be a coil for LTRUE (or LFALSE). If someone added a rund and a coil for LTRUE (or LFALSE), then there can be very, Very, VERY <b>VERY</b> serious and debilitating problems in sequencing. The operating system is where LTRUE (and LFALSE) are...

Regardless of DLN type, there is only one FSR, and it's divided between fuel nozzles and/or combustion zones as needed.

Can you post the P&IDs for Gas Fuel and Atomizing Air to a websharing site? In my recollection, diffusion refers to diffusion flame, which is the bright orange flame which emits UV, as opposed to premix combustion which doesn't emit any UV. There must always be a small diffusion flame (or...

khoriwal000, Honestly, I can't recall which stages are currently connected to the existing compressor bleed valves. (Because it's not something that can be changed--the axial compressor casing is cast for the bleed configuration and can't be changed (the stages which are bled during start-up...

<i>Based on the information provided </i> and without being able to see the application code running in the turbine control panel, the data you are reviewing, AND the alarm logs for the data you are reviewing. The likely probable cause is that some condition was active or had been active causing...

khoriwal000, Probably only the OEM could tell you how to do that. How would this information be used?

Khaledian, It sounds as if the rotor wasn't properly balanced, and/or the bearings weren't properly installed or aligned. Presuming someone was near the unit when it was being started and the vibration was real (that is--there is no instrumentation issue), there is nothing controls-related...

Aptx4869, What do the Operation Manual sections on the fuel systems and combustion system say the diffusion air is for? I believe GE has published a lot of documents describing DLN combustion systems, many of which are freely available on the World Wide Web, that provide very good--if...

Aptx4869, What do you think happens to the liquid fuel that is not ignited when the unit fails to establish flame when starting on liquid fuel? The atomized fuel condenses on the inside of the combustion liners and transition pieces, the nozzles and buckets, and in the exhaust. None of the...

Yasin, The answer to your question is the servo-valve's reference signal. In general, in the past GE heavy duty gas turbine control systems have had a negative reference for fuel control valves when shut down. For example, many machines have a negative reference of from -25% to -40%, which...

Saul, That's correct. A lot of factors determine how much the generator terminal voltage will change when varying excitation while synchronized to a grid. Some sites will see a bigger change in generator terminal voltage than others. And, yes, that is trying to change grid voltage--and...

irfada ejiro, The subject of servo-valves as used on GE-design heavy duty gas turbines has been covered many times on control.com. Fortunately, past threads are archived, searchable and accessible using the 'Search' function of control.com. If you can be more specific, we can probably...

Greg, Are you referring to an isolated system (also called an "islanded" system), where the two prime movers and their generators are supplying a load/loads independent of other prime movers and generators on a grid? Is either of the generators--or both--connected to a transformer before...

Rajeshbaby, You will probably find that all of the I/O which is connected to <S> is "lost" when this occurs. What have you done to try to resolve the problem, and what were the results? The Diagnostic Alarm is telling you that there is a problem with the IONET, which connects <R>, <S>...

RSolo, THANK YOU for a very complete list of the issue and the steps taken to try to resolve the issue as well as the results of the efforts! It is MUCH appreciated. 9. There is a DIAGC.DAT file which MUST match the exact set of cards which are installed in the Mark V. Unfortunately, many...

davidmcc, Most of the RTDs in GE-manufactured generators used for heavy duty gas turbine applications are embedded into the stator when the windings are installed in the slots. They are not really replaceable--at least none of the ones I've ever worked on. Unless you were rewinding the stator...

There are two gas valve tests, and they're commonly confused. The idea of THE bottle test is to check the integrity of both the SRV and GCV, by admitting some fuel gas pressure into the P2 (intervalve) cavity after closing the vent valve (20VG-1) and monitoring it to see it if drops--which...

> What to do if surge/stall condition occur in axial > compressor at rated speed? The axial compressor bleed valves of a GE-design heavy duty gas turbine offer no protection against surge/stall at rated speed. And, most newer GE-design heavy duty gas turbine control systems monitor operation...

Yasin Rupani, "... normal turning gear motor ... " Hmmm. I've worked on a LOT of GE-design Frame 9Es and I've never seen one with a turning gear motor. Who was the packager of the Frame 9E at your site? GE? John Brown? BHEL? (It doesn't really matter; I'm just curious.) How is the turning...

Saul, You are right; the internal air circulating fan blades on the generator rotor would probably work best if they were changed at the same time the generator rotation was changed. Air would still circulate, but it probably wouldn't cool as well. Actually, most synchronization schemes...