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  1. hohoim2

    GE Gasturbine Start Check L3STCK_LS

    @WTF? Looking at the manual, it says "Exhaust Frame Blower Isolation Valve Not Open (L86TKA)", but as far as I know, the exhaust frame blower doesn't have an isolation valve. That's quite strange.
  2. hohoim2

    GE Gasturbine Start Check L3STCK_LS

    I am working with a 7FA turbine, Mark VIe control system, and LNG as fuel. Currently, I don't know how to use the Rung Display function. When I check the logic, it shows a MOVE Block, but I can't fully understand the information from there. The MOVE Block's "block enable" and "source variable"...
  3. hohoim2

    GE Gasturbine Start Check L3STCK_LS

    In the GE gas turbine start check sequence, I’m curious about L3STCK_LS (Isolation Valve Limit Switch Start Check Permissive)—specifically its purpose and which valve the Isolation Valve refers to. Could you clarify?
  4. hohoim2

    Why does the Extraction Turndown Valve open during low load conditions in a gas turbine?

    We have a GE 7FA type gas turbine with a Mark VIe control system. The turbine is rated for 188MW, but it is typically operated at a low load of around 100MW, during which the turndown valve opens. I am not familiar with ARES or MBC, but I know that our system uses DLN2.6. The turndown valve is...
  5. hohoim2

    Role of Bypass PCV and the Reason for Including Drum LEVEL HHH in Trip Conditions

    Hello, I would like to ask about the role of the Bypass PCV and the reason for including Drum LEVEL HHH as one of the trip conditions for the Bypass PCV. Role of Bypass PCV: The Bypass PCV (Pressure Control Valve) regulates steam quality during startup, preheats the steam line, and circulates...
  6. hohoim2

    Why does the Extraction Turndown Valve open during low load conditions in a gas turbine?

    Hello, I have some questions regarding the operation of the Extraction Turndown Valve during low load conditions in a gas turbine system. The control logic I have reviewed is as follows: The CA_CRT (Combustion Reference Index) is calculated using the CTD (Compressor Discharge Temperature) and...
  7. hohoim2

    Curious about the reason for the difference in lube oil tank differential pressure during gas turbine startup and shutdown.

    The gas turbine type at our power plant is 7FA, and the L.O Tank vacuum pressure(D.P) cannot be seen on the CCR (HMI) and can only be confirmed by a local gauge on site. I was wondering why there is a difference in the L.O Tank differential pressure when it is normally started up and shut down...
  8. hohoim2

    Why does rotor eccentricity increase when the turning gear is engaged on a steam turbine?

    Thank you for the explanation. I understand now that the rpm drops causing reduced centrifugal force, which leads to increased eccentricity readings. The reason I asked this question is because I heard that if the eccentricity reading is high after engaging the turning gear, they cannot start up...
  9. hohoim2

    Why does rotor eccentricity increase when the turning gear is engaged on a steam turbine?

    Why does rotor eccentricity increase when the turning gear is engaged on a steam turbine?
  10. hohoim2

    What is GE's gas turbine 'CA_CRT'?

    What is GE's gas turbine 'CA_CRT'? Depending on the change in the CA_CRT value, the DLN Mode also changes, and the TurnDown Valve opens and closes, but I can't quite understand what CA_CRT is even after looking at the logic.
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