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ESKAY, I could use a short vacation myself. Thanks for the feedback!

nic, I don't think that speed scaling was the main question MWO was inquiring about. I completely misunderstood the original question and was wondering why someone would be using a SEL relay for "synchronization" instead of the Mark VI (some SEL relays can actually send signals to the turbine...

sanjay, The real problem is: Why did the compressor bleed valve<b>s</b> (plural) close at 2682 RPM? (Because the compressor bleed valves are all supposed to close at the same time.) It's not normal for the compressor bleed valves to close below approximately 95% speed (which would be about...

ARM, Since GE doesn't typically supply HRSGs and dampers (but it might) it's not typical for them to use any turbine input devices to control dampers in the turbine exhaust. Another control.com contributor, otised, might have some other experiences since he worked in the Projects...

It's beginning to become clear to me now. Sorry it's taken so long. Mark IV turbine control systems only had a micro-synchronizing module and logic which closed the breaker in AUTO synch mode. In the breaker close circuit there was always an electro-mechanical relay contact in series with the...

omer jumma, <b>WHEN DID THIS PROBLEM START?</b> After an emergency trip from load while running on liquid fuel? After a maintenance outage when fuel nozzles were replaced? After "re-calibration" of the LFBV (the liquid fuel control valve) LVDTs? After replacement of the liquid...

ebing, You are most welcome! Thanks for the feedback! "Feedback is the most important contribution!"(c) here at control.com. It's what separates good information from great information.

MWO, The load gear nameplate <b>IS</b> the proper speed-to-frequency conversion. The Mark VI (control processors and <P>) should be configured for 5106 RPM equals 100.00% speed--<b>IF THAT IS WHAT'S LISTED ON THE GEARBOX NAMEPLATE, not some piece of documentation.</b> This specific topic...

I agree with Roy Matson, and I also presume the original poster is referring to a heat exchanger of some type. I would like to add that if you throttle with the inlet valve of a heat exchanger there is a chance that insufficient fluid will get past the inlet control valve to keep the vessel...

As with all GE operator interface/HMI products, the OSM has gone through several iterations. Some communicated via the StageLink (with Mark V turbine control panels), and others communicated via the PDH with the HMI running CIMPLICITY and TCI to obtain data indirectly from the Speedtronic...

Hi RY, Heavy duty gas turbine performance and efficiency are a function of MANY parameters and internal clearances. Turbine inlet air filter type and condition; axial compressor cleanliness; turbine hot gas path components and fit/alignment; turbine nozzle and -bucket condition; exhaust...

Hi, RY, Turbine compartment vent fans DO NOT always come in pairs. Redundant fans are a purchased option, unless the turbine is located inside a building in which case most turbine compartments have redundant vent fans. It's extremely interesting that you noted the operating...

Pram, <b>Typically</b>, the three generator bearing vibration sensors ar connected to the Gen. Beg. group, which is the third grouping is sensors (out of four possible groupings), which would usually be inputs 9, 10, & 11. You have disabled input 3, which is usually the #2 Brg. seismic...

Interesting question. A GE OSM is nothing more than an IBM-compatible PC with a NIC (Network Interface Card) to communicate with Speedtronic panel(s) and some proprietary software to gather and transmit data, usually over another NIC to a GE Monitoring & Diagnostics Center computer located...

Angel Albornoz, I have very limited experience with Solar gas turbines, so I'm not saying anything about how any model of Solar gas turbine would operate on liquid fuel, or what the axial compressor discharge pressure should be, or the atomizing air compressor discharge pressure should be...

Pramesh khan, We would need a LOT more information than you have provided to be of much help. I believe the L39VV block has been covered before on control.com. You would need to tell us what Control Constant(s) you have modified, what they were prior to the modification and what they are...

G.Rajesh, I said the clutch should not be slipping any time liquid fuel is to be flowing (or, ALL the time liquid fuel is to be flowing the clutch should not be slipping). A clutch is, by definition, a device for slipping and for not slipping. On a GE-design heavy duty gas turbine the...

Umar, >GE gas turbine with MARK IV control >showing ground fault <b>in MARK IV side.</b> And herein lies the BIGGEST problem with troubleshooting grounds on GE Speedtronic turbine control systems: Because the Speedtronic annunciates the ground fault alarm, the ground <b>MUST</b> be in...

Sandy, Since I alluded to how "simple" the fuel control valves were in GE Speedtronic control systems, I should probably explain in a little more detail. In general, each valve receives a position reference signal. The position reference signal is derived from calculations done when a...

Sandy, GE-design heavy duty gas turbines can basically be divided into two groups: those with conventional combustors and those with DLN (Dry Low NOx) combustors. Those with conventional combustors do not typically (almost NEVER, actually) have valve characterization tables in the...