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Greetings While I was reading GEK-107092d, I came across something not very clear. It talks about isolating one cooler (in case it has a failure) of the generator. Fortunately, we haven't had any cooler failures in the past. the quote is: "If a cooler leak is severe, the defective cooler...

Dear all During our outage, found gap voltage for Bently Nevada axial displacement probe was around 6.4 Vdc. I&C team adjusted this one to 10.2 Vdc since 10 Vdc is the recommended setting. After unit back to service, the axial displacement reading increased too much while the turbine was...

Dears, After we completed T&I for one of our units, three of the hazardous gas detectors read high when transferring from mode 4 to mode 6Q. The total number of detectors is eight. It seems there is really gas leak in the turbine compartment. Now I am asking if we could pressurize the pm4...

Greetings all, During our T&I inspection, the turbine shell (casing) was removed for some job (not related to 1st stage nozzle). We found the 1st stage nozzles (S1N) at 9 & 6 clock positions have their trailing edge melted to some degree with TBC removed also from trailing edge. the leading...

Greetings I have a small question regarding the signal l52qv1a "lower case" (description of the signal: # 1A Lube oil mist separator running ). the signal is defined in VCRC card and TBCI Board (contact input). Now my understating is that if the signal is "1" then the contactor of the...

Greetings I am newbie in Control Systems. So please take my questions patiently and correct my understanding. From my understanding, The way "Redundant Input Signals" are handled is either High Select or SIFT Voting How the process of high select takes place ? Give me please a...

Greetings all. In the previous days I have been working on Gas Turbine. And in the next days I will be also working on steam turbine. Our plant is Combined Cycle with 3 GTs Exhausting into 3HRSGs and the HRSGs supply One Steam Turbine. Our steam turbine is GE D11 and the control mode is...

Greetings Our Gas turbine (7 Fa Dln2.6 Mark VI) trips on high exhaust temperature spread after selecting IGV Temp Matching (transferring from SC into CC). After selecting Matching ON, spreads #1, 2, and 3 start increasing fast. After selecting Matching OFF, spread return to normal...

Greetings to all The unit I speak about is 7FA turbine. Recently we had a trip on loss of flame because the hydraulic pressure went very low (650 Psi). the standby-pump started and got the pressure back to normal after 5 seconds. I believe the accumulator was not charged properly because...

Greetings to all of you I am asking about the F-Class turbine operation (advanced) course offered by GE Customer training in Texas. Any one tried it before? is it worth the cost? because it costs 3500 dollars. The course is 5 days, 8 hours a day. The Agenda is as follows Day 1...

Greetings, The lower half of the combustion wrapper has a manhole with a pipe which drains either Water Wash or Liquid Fuel. For the Water Wash it is clear for me how the water gets into the combustion wrapper. But I don't see any way of liquid to get into the combustion wrapper. The liquid...

Greetings all. I have been wondering about the purpose of diffusion air in DLN2.6. Is it used before transferring into premix mode? Is it used for Gas Turbine Purging? Diffusion air has a manifold which is distributed to all Cans. Diffusion air is clearly taking from CPD. The connection of...

Hello to all. Introduction: The unit is Dual-Fuel 7FA turbine, DLN2.6. Primary Fuel is Natural Gas.The liquid fuel system have 3-way valve and re-circulation system. The unit runs on liquid for testing each outage period. We mainly suffer from two issues related to 3-way valve. The first...

Greetings to all. I will try to provide as much details here, so we can learn from each other. The unit I speak about is 7 FA turbine, dual fuel with DLN2. The unit has 14 Cans and 27 thermocouples to monitor the exhaust temperature. The igniters are on Cans 2 and 3. The flame detectors...

Greetings. We had vibration on bearing 2. The mist eliminator filter was choked so there was no sufficient vacuum for a period of time before the vibration happened. The clean side of the Air inlet filters was dirty (but not that much), also bore scope showed that the turbine buckets are...

Greetings, We had some 3-way purge valves passing liquid to the can while on gas operation. We have opened one of them and there was small coking in the purge air line port. So there are two problems liquid passing to can + liquid present in the purge port. I don't know why, but one of the GE...

Greetings to all, We have a liquid fuel system with re circulation and 3-way purge valve. the liquid fuel filters (we have 2 for each unit) have thermal relief valve that dumps the liquid into the false start drain (FSD) tank. These valve are to be set 105 psig, once pressure reaches that...

Greetings We have 7FA Turbine, 14 cans and the false start drain is in the lower 7 cans. What is the idea behind the false start drain being only in the lower cans? Is it gravity or what? Also I noticed that the dead bottom can (that is can 7) has a bigger false start drain pipe than the...

Greetings, One of our 7FA turbine had high dynamic pressure in can 3 and 4 while running on natural gas and the liquid fuel re-circulation was on. Now the unit is off, and while liq fuel re-circulation is on, the 3 way valve is passing liquid fuel to the liquid fuel nozzle and combustor and...

Greetings, 1.We have 7 FA turbine, the lift oil pressure is 3500 psig, and the lockable flow control valve is adjusted so that the shaft is lifted by 5 mils approximately.I wonder what would happen to the pressure of lift oil if we increase the lifting distance and put is for example 7 mils...