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Dear >The control system is Mark VI. We just can't enter inside >the block as it looks like blocked from GE. What is the name at the top of the "block" in the main pane of the Toolbox window? If the name is something like 'GASFLWCALCVn' then it's a gas turbine block, and you should be...

khoriwal000, >i have doubt about entrance of CPD into liquid fuel line (in >case check valves are passing). >CPD exits from 17th stage of compressor and enters into >reverse flow combustion canes liners. how come CPD enters >into liquid fuel line? The liquid fuel lines discharge...

gtengineer, Does the application code in the turbine control system (you didn't say what it is) not have a GASFLWCALCVn block? All of the internals of the block are shown in the graphic depiction of the block, and if the turbine control system is a Mark VI or -VIe if you right-click on the...

I think this was covered in either the 'Mark V Users Guide,' GEH-5979, or the 'Mark V Maintenance Manual,' GEH-5980, or maybe the 'Mark V Application Manual,' GEH-6195, but just in case it isn't (or you don't have the manuals).... I believe one has to have the Maintenance, Service or Supplier...

Hello, When did this problem start? What Diagnostic Alarms are present and active (even the ones thought to be irrelevant to this problem)? >Note: There is no substantial change in compressor discharge >pressure which is one of the factor in calculation of >allowable spread. One of...

Sarah, First, the lift oil line has to be repaired. L.O. should be kept on to keep the bearings cool at all times when turning gear (cooldown) is not in operation until at least 24 hours after the unit reached zero speed and cooldown could not be maintained. With sufficient time to cool...

Aptx4869, > 1- What is the minimum hydraulic pressure that the turbine can > survive without any problem. I heard it is around 700 Psig. > Is that true. I don't know if there's any "minimum survival" pressure published anywhere in any documentation. BUT, if the hydraulic supply pressure...

Booster AA pressure is very difficult to measure, especially with gauges that are sized for normal operation (200 psig; 16 barg). If you're not measuring any pressure (with a gauge of appropriate range) at the AA manifold downstream of the check valve, it would seem there is likely a problem...

davidmcc, The only reason I can think of for wiring RTD leads together is that in days gone by, no unused, low-level analog devices were left "floating" (unconnected to some circuit). So, their leads were wired together to prevent induced voltages from being developed and potentially causing...

I've never seen that particular alarm "RIM EEPROM ...." It's the 'RIM' that's unusual to me. Have you looked in the Mark IV Maintenance Manual provided with the unit? If I recall correctly, the Mark IV Maintenance Manuals had most, if not all, of the "Diagnostic Alarms" pretty well described...

vimal gupta, If the turbine is being operated in Droop Speed Control mode in an islanded situation ("captive power plant"), then there MUST be some kind of external load control system driving TNR. You said the frequency went <i><b>up</i></b> to 48.7 Hz.... and yet TNR went down to 98.1%...

khoriwal000, The subject of exhaust temperature spreads has been covered many times before on control.com. Have you used the 'Search' feature at the far right corner of the Menu bar at the top of every control.com webpage to look for exhaust temperature spread-related threads? As for the...

Sheheryar, You will find electronic copies (.pdf files) if almost all the Mark VIe manuals on the hard drives of the HMIs supplied with the Mark VIe turbine control systems. They are usually in at least two locations on the hard drives; search the hard drives for "GEH*.pdf" (without the...

chiranjeevi, There has been LOTS written on control.com about the exhaust temperature algorithm (block) and how many failed T/Cs will result in a trip. You are over-thinking the situation. (And usually, only Frame 5's and a few Frame 6B GE-design heavy duty gas turbines will have only 13...

Aptx489, Based on the questions you have previously asked here on control.com, I wonder if you would get the knowledge you seek. I would venture that the class is geared more for operators with little or no knowledge of F-class turbines and auxiliaries; I presume the material is geared more...

cloftin, Thank you for the feedback! "Feedback is the most important contribution!"(c) here at control.com. SSR (Stop/Speed Ratio) = SRV? The Mark V (all Speedtronic panels) have a check on the position of devices with LVDTs to see if the position feedback is "good"--and one of the...

vimal gupta, Good news about the exhaust duct; and glad to hear you found the problem with the failed exhaust T/Cs. TNR is the Turbine Speed Reference. You didn't say if you were operating with Pre-Selected Load Control active or not--makes a HUGE difference. On grids with unstable...

Roy Matson makes a great point--T/Cs require T/C-specific extension wire to connect them to the control system/monitor. And, I agree, four-wire accuracy isn't needed for motor bearings. Again, I don't think there's a real "standard" for this--it just depends on personal experience...

cloftin, Here's a little tip that I have found to be VERY helpful when using AutoCalibrate of Mark V. When the AutoCalibration is complete, the scaling values in the RAM of each of the Mark V what one is supposed to do is to take the average of the three 0%- and 100%-stroke values for each of...

cloftin, Thanks for the feedback! You are correct--if you have to deviate from the as-found values using a rebuilt device, you should be questioning the quality of the work done on the device. The really great thing about working on GE-design heavy duty gas turbines is that one doesn't...