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Agreed; the concept here is a bad idea for several reasons--though I will add that as we speak work is being done to eliminate the use of UV flame detectors on combustion turbines through the combined use of axial compressor discharge pressure monitoring and exhaust temperature monitoring. The...

P.S. (Post Script), I believe GEH-6721, the Mark VIe System Guide, has lots of information on the various power distribution cards and requirements. It's probably best described in the "Installation" section what the basic power requirements for the system are (in terms of voltage range and...

VKGUPTA, Without understanding where the "new", direct 125 VDC source comes from that you want to supply, it's not possible to say what the implications would be. It's also not clear why it is felt it is necessary to supplement (back up) the 125 VDC battery supply. Is there some history of...

I would say that if this is a recent condition for a machine which has been running without any issues for some time, then is there something which might have "triggered" the problem? A recent maintenance outage? A trip from load? When was the last off-line compressor water wash performed...

Timus, Are you sure the "Common Gas" temperature is inside the generator casing? When did this problem start? After a maintenance outage? After a trip from load (high load)? I don't have any F-class Generator Package Wiring Drawings to refer to, but if I recall correctly there are some...

What were the spreads before the change to liquid fuel? If the exhaust T/Cs were working fine before this change it's likely they are still working fine. If the cold spot/hot spot moves with a change in load and IGV angle, it's not a T/C problem. If the cold spot/hot spot doesn't move with a...

hassanj, The answer given presumes a typical GE-design Frame 6B heavy duty gas turbine with a centrifugal Accessory Gear-driven Main Atomizing Air Compressor (the most commonly used compressor was manufactured by Atlas-Copco), and a water-cooled Atomizing Air Precooler with a Robertshaw (or...

Chris W, Thanks for the feedback! It's always welcome, and very useful for many. I'm going to guess, one, the igniter length was either shorter or longer than the original putting the spark out of the way of the liquid fuel "spray" keeping the tips from getting too wet. And, my second...

The "dumb operator" is the one who doesn't ask any questions, and assumes that because he's an operator that he knows everything--or is expected to know everything. (It truly is a 50/50 split between those dumb operators who will outright say they know everything about the turbine and...

KRManish, If the stop valves are passing that badly, wouldn't the prudent course of action be to resolve this problem? Since most steam turbines are different from most other steam turbines (with the exception of the Combined Cycle steam turbines being produced to day which are very...

Benjamin, Thanks for the feedback! And, remember: Contrary to popular belief, Diagnostic Alarms can (and do) really have meaning and can be useful for troubleshooting.

bil07, > FU-27 is usually for 20CB !!!!! Please explain this comment. Yes; FU-27 is usually for 20CB-1, and FU-28 is usually for 20FD-1 (if the unit has liquid fuel capability--this is the Liquid Fuel Forwarding Stop Valve Solenoid--another large solenoid-operated valve, usually made by...

What does the manufacturer's installation instructions indicate what is to be done with the grounds? Have you compared the existing wiring to that recommended by the manufacturer? If so, what differences have you noted?

> If there are no available storage devices for a grid, what happens > when there is excess energy in the grid? The grid frequency increases.

Qurban, Use the L.O. P&ID to identify all the possible areas that L.O. may be lost when the unit is running. GE-design Frame 9E heavy duty gas turbines have three bearings--one of them is in the middle of the machine between the axial compressor and the turbine sections. If you see no...

And, was there truly no Process Alarm alerting the operator of the issue? If there was no Process Alarm, was there a Diagnostic Alarm (or three) warning of a failed input it Voting Mismatch?

Mr. Alexander, Thanks for the feedback! What, pray tell, is L94TC, and why was it causing a shutdown? How did you resolve the "false" L94TC shutdown?

The 'tell-tale' alarm is the BATREF alarm. This means the <CD> core is not getting the (nominal) 125 VDC for the contact input interrogation/wetting voltage, or, the power for the TCDA card from the TCPS in <C> is missing. But the <C> TCDA is unable to reference the contact inputs to the...

Chris W, Even uncombusted (or partially combusted) diesel vapours smell distinctly like diesel. What is the turbine control panel using for liquid fuel flow feedback? Is there an RVDT on the high-pressure liquid fuel pump swash plate axis/shaft? Is it calibrated correctly? Sorry; I've...

> Sets of alarms from CD DTBA & DTBB could not reset. Um, what kind of alarms--Process or Diagnostic? What are the alarms (specifically)? I believe the Mark V Maintenance Manual, GEH-6195, shows the IONET from <C> runs between the TCCA and the TCDA. The IONET termination resistors on...