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The only way to know for certain would be to review the program in the turbine control system. GE-design heavy duty gas turbines with conventional combustors which use steam injection for NOx emissions reduction can operate at Base Load without steam injection, but the NOx emissions will be very...

glenmorangie is spot on--<b><i>based on the information provided</b></i> the most likely culprit is GCV LVDT calibration, or IGV LVDT calibration. The title of the thread says the unit (a Frame 5) is tripping at 81% speed, which is about when variable IGVs start to move open from 34 DGA to 57...

hany5757, 1) Without being able to see the P&ID for <i>your</i> turbine it's impossible to say for sure what the function of the orifice is--but it's probably just to try to limit flow should there be a break and flow would try to increase very rapidly. As such, the pressure on both sides of...

hany5757, I agree with everything bkarim55 has said. However, I believe that 3-5 barg oscillation is excessive for a machine with a properly charged and properly valved-in hydraulic accumulator. It's very common for the bladder in the accumulator to have been damaged during attempts to...

cww, Excellent ideas--all! Thank you, very much.

niazbibiyana, I miswrote when I wrote that fuel was used to warm the unit in FIRE Mode to as high as 95% speed. Even on a GE-design Frame 9F-class heavy duty gas turbine when FIRE Mode is selected during a START, the speed will remain close to firing speed--but the Speedtronic will adjust the...

Hi, It's difficult to propose a course of action when you haven't told us what you've done to check for leaks--or any other particulars about the installation/application. What does the equipment manufacturer suggest for checking for leaks? A simple but effective method for checking for...

elomoon, The best place to start looking for information is always in the manuals provided with the equipment by the packager. There should be a section about the Fuel System in the 'System Description' section of the manuals. Also, there is a document provided with the control system...

Thanks VERY much for the feedback! "Feedback is the most important contribution!"(c) here at control.com. Please try to remember if you post again to tell us the Mark VI is a SIMPLEX; it can be very important to know for some troubleshooting.

elomoon, List the Process Alarms which were annunciated just prior to, during and after the trip, along with their times, for a period of 60 seconds prior to the first trip message, and for a period of ten seconds after the last trip message. (GE control systems are notoriously bad about...

niazbibiyana, As you noted, that document refers to the firing and warm-up FSR for a GE-design Frame 9FA heavy duty gas turbine. Those machines--unlike the Frame 9E the original poster asked about--use the generator as a starting motor, which supplies torque during acceleration to as high as...

Ouch! I, personally, have never seen a GE-design heavy duty gas turbine with a single flame detector--but I haven't seen every perversion of GE-design heavy duty gas turbine ever made, either. So, this is predicated on there being two flame detectors--redundant flame detectors, so that a...

glenmorangie, I don't have any elementaries to refer to at this writing, but I believe when either Firing or Warm-up FSR is active they are both like minimums--and even if exhaust temperature control becomes active and tries to limit (reduce) FSR it can't go any lower.i say this because I...

Maythem, Here are <i>examples</i> of firing- and warm-up FSRs:<pre>FSKSU_FI (Firing FSR): 20.0% FSR FSKSU_WU (Warm-up FSR): 16.5% FSR</pre> And, a typical firing speed for a GE-design Frame 9E heavy duty gas turbine is 10.0-12.0% TNH. So, with FIRE Mode selected during a unit START...

Is the file you copied marked as read only? Not every .mdb file is a "generic" database file, capable of being opened by a database program/application like Access. What are you trying to do?

vince64, Thanks for the good information. I presume the Mark VI is a SIMPLEX, can you please confirm? BOTH of the relays not energizing (K25P and K25) are required for automatic synchronization (presuming the TTUR wiring to the generator breaker close coil is correct). And, that's another...

Maythem, FIRE mode is basically a test mode. When selected prior to initiating a START, the unit will go through a normal purge and firing sequence, but when flame is detected and fuel is cut back to the warm-up value it will be held there as long as FIRE mode remains active. The starting...

Hi, The BEST place for anyone new to GE-design heavy duty gas turbines to start is by obtaining their own copies of the unit P&IDs (GE used to call them 'Schematic Piping Diagrams' or "Piping Schematics." They are about the simplest drawings to understand--and absolutely critical to becoming...

fatimafert1, Is this a new installation of the fire & gas panels, or was it working and then it just stopped working? Was the software in the F&GPs upgraded just before the problem started? Was one or more of the F&GPs re-booted, reconfigured and/or replaced? What kind of Mark*...

Dear vinayak_paranjape, In your original post you had mentioned: "...Another interesting thing was that grid frequency was fairly steady but GT speed was showing variation from 99 to 102 %. This speed variation was physically seen on field also." 99% TNH is 99% frequency, and for a 50 Hz...