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niazbibiyana, So, to clarify, when using Pre-Selected Load Control on a GE-design heavy duty gas turbine with a Speedtronic turbine control system the load reference is used to modify TNR. And, when the actual load equals the load reference TNR stops changing. When the operator changes the...

bfishe01, I don't know your experience or knowledge, and I'm providing a lot of this information because a lot of people read these posts and try to learn something from them. So, I'm not trying to insult you or your site personnel or practices, but I do frequently find there's too little...

bfishe01, What was the CO2 pressure regulator set for? Purging should normally be done when at zero speed, so as not to allow the generator rotor fans to mix the hydrogen and CO2. After the unit was purged of CO2, was the CO2 then purged using air? What instrument was used to measure...

!!! CORRECTION !!! This sentence: "...If the device has to open from the current position ..." should have read: "...If the device has to open from the <b>present</b> position ..." Sorry for any confusion.

niazbibiyana, Where did you see this "free governor mode" reference? I used my preferred World Wide Web search engine and found this interesting result: http://freegovernormode.blogspot.com/ I did some other reading of other search results and I believe the intent of this new power...

kwaku, The amount of opening is NOT controlled by the amount or polarity of the current. The electo-hydraulic servo-valves used on GE-design heavy duty gas turbines are NOT like other, more common types of positioners where an increase of 4 mA in a 4-20 mA positioner will cause a change of...

ibr2016, I'm wondering if one of the things which is causing confusion is the data you provided as "at online wash" showing an increase in output. That would be the TEMPORARY result of increasing the mass flow through the axial compressor and turbine when water is flowing during the on-line...

Hello! I've tried using a couple of different web browsers to view the photos in the links provided. I can only see one photo in each link even though there appears to be more than one photo in each link. <i>From the pictures I have been able to see,</i> the damage appears to be physical...

asarhan, Servo-valves are not four-position valves; they do not only have four discreet positions and can be in only one of four positions. The electro-hydraulic servo-valves used by GE for all hydraulically-operated devices (fuel control valves and IGVs, primarily) are infinitely...

To the best of my knowledge, GE hasn't produced any recommendations for on-line washing. I don't think they really like on-line washing--or they haven't in the past. Based on the data you provided, there was NO change in load or CPD after the wash. Therefore the wash was ineffective for all...

I have read and re-read this post several times. I'm not clear on exactly what is happening. It's extremely odd--extremely--that two Mark IVs started exhibiting the same behaviour at approximately the same time. IF both the Mark IVs were powered by the SAME battery, then problems with an...

Mund123, There is a feature/option in the Mark VIe that uses the expected breaker closure time to try to close the breaker at the exact instant the voltages are in phase with each other (i.e., when the synchroscope is at 12 o'clock). By "anticipating" the time when the voltages will be in...

CORRECTION: The first sentence of the description of the third graph should have read: "In the graph above, TTRX<b>S</b> is to the left of TTRX<b>P</b>, meaning that TTRXP is higher than TTRXS." Apologies for any confusion.

Seeker1988, To quote E. Edwards Deming, the founder of quality improvement, "Without data, you're just another person with an opinion." I try very HARD not to deal in opinions--but sometimes fall victim to the trap when there is no data. DLN combustor-equipped machines use CPR to calculate...

12) What is the value of CSKGVMAX?

Seeker1988, 1) What is the value of TTRXP (the primary exhaust temperature control reference)? 2) What is the value of TTRXS (the secondary, or back-up, exhaust temperature control reference)? 3) What is the value of TTRX (the low-selected value of TTRXP or TTRXS)? 4) What is the...

davidmcc, Most companies who perform the work will come with their own tooling. Depending on the age of the machine and who provided it, the required tooling for various operations was listed in the Operations & Service Manuals. If GE provided the unit, it would have been in Vol. III, the...

niazbibiyana, As with all things which emanate from GE Belfort, they change--frequently and often. Failed exhaust thermocouple detection is no exception. (GE Belfort has been given responsibility for Frame 9 machines, Es and Fs and FAs, as well as Frame 6s.) So, without being able to see...

Seeker1988, 1) What kind of combustion system does the turbine use? 2) What Process- and Diagnostic Alarms are active when the unit is running (even the Alarms it's believed are not relevant to this particular issue--just list ALL of them)? 3) Why do you suspect the IGV LVDT...

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