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EshanD, I did just recently read that a dirty axial compressor doesn't have as great an effect on the mass flow-rate of air, but it does cause the axial compressor discharge temperature to rise, which also reduces compressor efficiency. I haven't had a chance to research that yet, but I...

EshanD, Ahhh, compressor washing.... Axial compressor cleanliness directly affects power output--a dirty compressor can't flow as much air, so the mass flow-rate through the machine is reduced, and that also increases the heat rate (a lower heat rate is better!). Washing can also help to...

CarlosMKV, I did think of one other possibility--the jumpers for signal isolation on the TBQx card where the new mA signals were terminated. I believe the Mark V does NOT provide power for <C> mA inputs but there IS a hardware ("Berg") jumper for grounding the input loop. Some other control...

waltrobinson, Interesting that there are two (2) extremely similar threads opened on the same day that are extremely similar. The other thread is: http://control.com/thread/1506350052 I don't have access to my Mark V Application Manual (GEH-6195), but I think you are trying to say that...

carlosMKV, Interesting that there are two (2) extremely similar threads opened on the same day that are extremely similar. The other thread is: http://control.com/thread/1506350052 I don't have access to my Mark V Application Manual (GEH-6195), but I think you are trying to say that...

Rokan, A couple of people have contacted me to say I didn't say what the difference between PFR ON and PFR OFF was. Not specifically, anyway. When PFR OFF is active and there is no other control scheme active (Pre-Selected Load Control; Remote Load Control; Base Load Control; etc.) the...

sir, >sir, if cooler tube is damaged and leaking, then air >(>7kg/cm2) should go inside water (4-4.5kg/cm2) circuit (to >a higher point or vent). How can it be a cause of this >abnormality? I said it wasn't likely, but it has been known to happen--particularly if the unit is frequently...

Jose, I don't have any experience with the phenomenon mentioned on another forum/website. Water is made up of two molecules of hydrogen, and one of oxygen. Are you saying that there is LOTS of water vapour in the area of the hydrogen seals? Or that water vapour is being released from the...

Shyam, LCC stands for LAN Communication Card; it's pretty essential to, well, everything. Are you certain the PROMs were installed on the LCC properly, with the proper orientations and no pins are bent or broken? All LCC cards in a panel should be the same revision level, as well as all...

sir, If leaks continue to occur at the same locations after maintenance outages that would seem to suggest issues with workmanship and/or reassembly techniques. Also, equipment does require replacement and/or refurbishment and will not have indefinite or infinite life. After a unit is...

khoriwal000, What fuel is being burned when the problem occurs? Typically, the AA Compressor discharge air temperature is not monitored--ONLY the Inlet (suction) air temperature. The air temperature entering the AA Compressor should be approximately 225 deg F--above boiling point, so that...

sir, Flanged joints with gaskets, and axial compressor- and combustion joints. Replace gaskets. Tighten joint bolts. Some axial compressor- and combustion joints require peening and if the casings are warped some sites have resorted to welding the leaking joints to stop serious leaks...

Is your system generating AC (Alternating Current)?

Totalizer data is stored in <R>, <S> & <T> (on the EEPROM. chips on the DCC/SDCC cards). If you're only replacing the LCC, it's NOT necessary to download anything. In fact, the I/O Configuration for ALL cards is stored on the EEPROM on the DCC/SDCC and when any card is booted (any time it...

Rokan_123, GE doesn't typically use TIT terminology for any of its turbines. For DLN combustors-equipped GE-desig heavy duty gas turbines there is a calculation which approximates 'firin temperature' which GE defines tone first-stage exit temperature (for units with air-cooled nozzles)...

Rokan_123, PFR usually stands for Primary Frequency Response. GE designed PFR to use to control generator load using an operator-adjustable load setpoint while still allowing the turbine control system to properly respond to grid frequency excursions. Some grid regulators are not...

Chiranjeevi, You have not specified which GE-design heavy duty gas turbine, or which packager. For decades, most false-start drain valves were operated solely based on compressor discharge pressure. That is, there was no solenoid-operated valve controlled by the turbine control system...

Hira, Your understanding of the working of the Combustion Monitor is not correct. "Failed" T/Cs are removed from the average exhaust temperature calculation--NOT the Combustion Monitor. Removing failed T/Cs from the Combustion Monitor function would defeat the purpose (which you have already...

There are at least three "fields" on the left side, center (vertically) of most GE-design heavy duty gas turbine HMI displays. The three are usually: Status, Control, Sequence (if I recall correctly). I would guess the field you saw change to "Base Load Temperature" was the 'Control' field...

Rotimi88, We don't know and presume the hydraulic ratchet mechanism you are referring to is a late-model system, with a self-sequencer (VH14-1 (I mis-typed in an earlier response above) that controls the flow of hydraulic oil (L.O.) to the forward pistons and the retraction piston, which are...