GE 7fa.04 not going above m3 mode, though the load on the machine could be reached base load. This is after a combustion cans overhaul to remove loose bolts inside.

 

You should get someone to come to site to help troubleshoot this. Give AP4 a call.

 

@Sanu,

To have ANY HOPE of help from this--or any World Wide Web forum--you need to provide the list of active Process Alarms AND Diagnostic Alarms when this issue is occurring. You also need to tell us if the machine uses ARES (Adaptive Real-time Engine Simulation, also called MBC--Model-Based Control) in the Mark* turbine control system. (Alarms--both Process and Diagnostic--can often be a GREAT help in understanding why some issue is occurring.)

[Warning--if the machine uses ARES (MBC) it's most likely that GE will need to assist with troubleshooting and resolving the problem. AND because the machine is an F-class machine and probably of newer vintage or recently upgraded it's highly likely that the owners/operators of the machine have some kind of technical support agreement with GE--one that might even allow GE to observe live data while the machine is running. ARES (MBC) is deemed company proprietary information by GE and there's not a lot of information available about how it operates and it's functions in abnormal conditions. So, it's best to probably get someone knowledgeable to your location if there is no technical support agreement with GE for the machine.]

It would also help if you could explain why it was necessary to remove loose bolts from inside the combustion cans (and, if possible) tell us how they got in the combustion cans and where they came from.

I would also suggest that running the machine in M3 combustion mode at Base Load is NOT GOOD for the hot gas path components. Just saying.... Just because it's possible doesn't mean it's a good idea for the machine internals, and could lead to some very serious, even catastrophic, failures if operated in that condition for longer than a couple of hours (unless GE indicates otherwise, and I would not expect them to do so--based on the "information" provided).