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SSAAFF, This is becoming quite ... painful. The details come in dribs and drabs. When Manual FSR control is used it only prevents the fuel control valve from increasing the fuel flow-rate. If something causes the fuel demand to decrease below the Manual FSR "gag" (setpoint), then the fuel will...

Ahmedsaad85, Thank you very much for the feedback!

Akin, Generally, this is done to lessen the time required to purge the gas turbine and exhaust (including the HRSG ("boiler") and exhaust stack) of combustible gases during starting and before enabling the ignitors ("spark plugs") and admitting fuel. The purging portion of the starting sequence...

SSAAFF, Answer: No. ”Manual FSR” control IS NOT the proper way to restrict load. The word ”gag” in this context means to limit by reducing or ”clamping.” In other words, if FSR is 59.6% and you reduce it to 48% using ”Manual FSR” control you are suppressing FSR and preventing it from being...

SSAAFF, The reason I am being so particular about this is because there is something formally called ”Manual FSR” in Mark* heavy duty gas turbine control systems. It's NOT something operators typically use; it's primarily used for troubleshooting or emergency situations. I believe what you are...

Ahmedsaad85, The plot thickeneth. The unit normally runs on liquid fuel--BUT, because of the inavailability of liquid fuel you are experiencing problems on gas fuel. There is long-forgotten commissioning activity called fuel matching, which is supposed to help make FSR1 (Liquid Fuel FSR) and...

SSAAFF, I apologize for adding to the confusion. 1) Do you now primarily operate the unit using Pre-Selected Load Control when there is no need for curtailment? 2) When curtailment is necessary, are you proposing to use the RAISE- & LOWER SPEED/LOAD buttons to reduce and maintain load...

SSAAFF, It's important to understand precisely how the unit is being operated in "MANUAL FSR" control at your site to be able to answer your question. Please explain precisely how the operator "...takes Unit control in FSR MANUAL mode..." Is the operator using the FSR "GAG" function on the FSR...

Ahmedsaad85, One has to be careful with these Control Constants, because some of them are intertwined with the FSRSU scheme.... Lovely mess. Lovely. How long has this problem been happening? Since commissioning? Since a gas valve refurbishment or calibration? (I'm presuming this is occurring...

Mohamedibr752, Good questions--all. I am extremely surprised at the values you supplied from the generator nameplate. The typical generator supplied by GE or one of its licensed packagers for use with a heavy duty gas turbine has a rating (in MW) which is higher than the turbine nameplate...

Irfan ahmed qureshi, As a control room operator you should have SOPs: Standard Operating Procedures. These should be mostly site-specific documents that describe what the Operations Managers and Plant Manager and Owners have decided are the proper operating procedures for the equipment, and...

Irfan ahmed qureshi, Some GE-design heavy duty gas turbine control systems use the IBH system for Anti-icing protection. If you have read some of my responses about IBH you know I believe it is a poorly named system for the purpose it serves--which is to protect the axial compressor from damage...

HOUCINOS, To my knowledge the Mark VI application code (the ”logic” or ”sequencing” or ”programming”) doesn't know about and can't make use of the date/time (day/month/year, hour/minute/second). Yes; the Mark VI control processors can tag alarms and events with the date/time, but the actual...

ANSWER, The answer is: Based on the information provided, no. And, it would be necessary to know more about what LVDT maintenance entails in this thread to give a better answer, too. You have chosen to include absolutely zero information regarding the valves, the number of LVDTs per valve, the...

kaag27, The P&IDs are always the best first place to start looking--always. What's missing most from the original post is: Where was the oil found in the air inlet filter structure??? This would be a HUGE clue to where it might be coming from, eh? And, the next important detail would be the...

makarand, I understand your first language is probably not English, but it's very difficult to understand the circumstances of your problem. You seem to be saying that during a "base load trial" the gas control valve is hunting between 62% and 73%. And you are saying something about a command...

This is a real possibility, but it should be accompanied by Diagnostic Alarms (usually is accompanied by Diagnostic Alarms). Recently, though, I saw a site which had turned off the 4-20 mA Diagnostic Alarms thinking that it would fix the root problem.... Of course it didn't; it just prevented...

Hi, Lusco, Gas turbine efficiency is difficult to measure, and very often difficult to troubleshoot, also. There are many, Many, MANY factors involved in gas turbine efficiency. First, it's really only possible to properly measure and troubleshoot efficiency when the gas turbine is operated at...

AshutoshMendiratta, Human operators. Trained, attentive human operators using RAISE- and LOWER SPEED/LOAD buttons. If the unit was at 18 MW before the frequency declined, and it went to 21 or 22 MW after the frequency decline, the operator needs to reduce load using the LOWER SPEED/LOAD...

AshutoshMendiratta, There is a limit to the amount of torque the synchronous generator's prime mover can produce and transmit to the generator via the load coupling (and load gear box if used). That's the absolute limit of how much load the generator can produce--the prime mover rating. In the...