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Obiloko4, If this explanation works for you, that's all that matters. Thank you for the kind words!

Well, if there was sufficient fuel AND the exhaust temperature didn't reach maximum then it's possible the unit could accelerate under its own power. The real question is whether it was good for the turbine to do so--good for the hot gas path parts. The LCI usually provides some torque all...

Really? An instrument <i>engineer</i> said that? That is incorrect. In fact, a long run of small tubing will affect the reading more than if the gauge/manometer was mounted directly on the Mist Eliminator. Get another gauge/manometer, put a tee in the tubing, and mount the new...

Aptx4869, Thanks for sharing these photos. In my personal opinion the amount of coking (carbonization) is extremely minimal; I've seen much worse. MUCH worse. I suppose, though, that the liquid fuel internals of the fuel nozzles may have blockages that resulted from the carbonization of...

topcat123, I'm more than a little confused. As I said, there are four basic types of Mark V panels, and it's very difficult to mix and match cards between them. There have been changes to IONET and DENET speeds in the various panels, and while some cards are "universal", others are not. In...

nldgeseeker makes an excellent point--if there is a tube- or tube nest leak in the AA Pre-cooler when the unit is running, the pressure of the air (CPD) in the cooler is higher than the pressure of the cooling water in the tube/tube nest which will prevent water/coolant from leaking into the...

Actually, I DO NOT believe all problems ARE the same. (Sorry for the typo!)

Aptx4869, I was traveling and wanted to get home to print these schematics and have a look at the "big picture." The hydraulic system is basically a static system--I say that because when the hydraulically-actuated devices (fuel control valves; IGVs) are in a steady-state position then no...

Jolek, So, you mentioned that inputs of FSL (usually the LVDT feedback from a liquid fuel bypass valve) were within 0.2-0.5% of each other. FSL and FQLT2 are not the same. And, a small amount of mismatch is allowed before a Diagnostic Alarm is annunciated (no; we can't see what the allowable...

igvman, I don't believe in coincidence. And I do NOT believe all problems are not the same, even if they appear to be. And, I've NEVER seen a card with issues that didn't have some associated Diagnostic Alarms. Now, I haven't seen EVERY possible problem, but I have seen a lot of them. And...

There should be a drain with a manual valve on it on the AA Pre-cooler shell. If you're getting lots of moisture out of that you can analyze it to see if it's just condensate (moisture from the CPD) or if it has any cooling water glycol in it (or whatever cooling water treatment is used at your...

glenmorangie, It's crazy, isn't it? When you give people printed copies of manuals and procedures, they want it in .pdf format. When they have .pdf copies, they want printed copies (even though one can print from .pdf). I applaud the original poster for wanting to have a printed copy to...

topcat123, Most likely you will require the PROM subdirectory which matches the PROMs which are installed in the panel. You can easily use the <I> processors just by making a couple of changes. First, refer to the IDOS directory structure in Chapter 3 of the Mark V Maintenance Manual...

davidmcc, Thanks for the feedback! So, it seems the L.O. Bearing Header temperature was not being monitored and controlled correctly. The typical Robertshaw temperature regulating valve used by GE and packagers of GE-design heavy duty gas turbines for DECADES was extremely misunderstood...

Topcat123, No, it's not generally necessary to download ALL to get a processor to A6/A7. There are basically four types of Mark V panels: A; Hybrid A; B; and Hybrid B. (Some versions of CARD_ID actually tell the user which version the panel is, but that's probably only on GE Mark V HMIs with...

jackb, I'm stumped. I do know there was a phenomenon known as "bucket rock" which occurred on the last stage turbine buckets of 7E/EA units and could be heard as "tinkling" when the unit was on slowroll (30-50 RPM continous rotation method of cooldown, replaced with hydraulic ratchet when...

Obiloko4, Thanks for the feedback. I think.... So, I have a very difficult time with this--all of it. How did the Control Constant get changed--and why did it get changed (the change which caused it to be less that 14 barg)? For a GE-design Frame 5 heavy duty gs turbine the axial...

dannys, It's common practice for all of the wheelspace T/Cs to be connected to a single TBTC terminal board, and that terminal board is then connected to a VTCC card in one of the Mark VI processor racks (I presume the Mark VI is TMR, but it might be SIMPLEX...). If that VTCC or TBTC is...

jackb, How old is the generator? Is the generator air- or hydrogen-cooled? Does the unit have a brushed or brushless excitation system? My best guess from the information provided is that there is something loose on the generator and/or exciter rotor. If it's brushless then it's...

igvman, When there is a large disagreement between processor servo output currents it generally means there is either a problem with the feedback for that servo output or the polarity of the current being applied to that particular servo coil is incorrect--not a problem with the TCQA card...