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mohamed31, Best to send your email to glenmorangie to get his materials to get you started reading on how GE-design heavy duty gas turbines typically operate (the standard GE control philosophy). Have you looked in the Operations and Service Manuals provided with the turbine? There is...

Chiranjeevi, >The key thing to know about MOVs is that while they are like >diodes in that they conduct above a certain threshold >voltage, they conduct in both directions (positive and >negative). MOVs are used to protect the Mark VIe printed circuit card <i>traces</i> and components...

Do you mean Temperature Control mode? Typically the displays used to indicate "Exhaust Temperature Control"--which could mean either Part Load Exhaust Temperature Control ("combined cycle mode, where the exhaust is directed to a HRSG (Heat Recovery Steam Generator--a waste heart recovery...

Chiranjeevi, When Product Code and Application Code are downloaded to the UCSx card (and I'm talking about initial programming, as well as any downloads made after a Major Difference resulted from some change), they are downloaded to a flash memory card installed in the UCSx card (usually in...

Let's try this again, folks. MOV - Metal O<b>x</b>ide Varistor

Abdooo, >What is the difference between control oil and hydraulic oil >in gas turbine? and what the function of them? and what the >main components of each? The best answer to these questions can be found on the Schematic Piping drawings for the Control Oil and Hydraulic Oil...

MOV - Metal Oide Varistor. An excellent discussion of MOVs (varistors) can be found here: https://en.wikipedia.org/wiki/Varistor The main purpose is to prevent overvoltages from damaging other components in the circuit. MOVs are usually placed on I/O terminal boards across the...

Belal_Mahdi, Yes; it's possible. There is very good 'Help' in Trend Recorder/ToolboxST. And, there's a manual for Trend Recorder. If you search the hard drive of the HMI for files with 'GEH' (without the quotes) in the filename, you will find at least one, if not several...

barindra75, So, first thing to know is most GE-design Frame 5 heavy duty gas turbines don't have hydraulic accumulators. So if there are high hydraulic flow situations there can be pressure fluctuations (spikes, dips, etc.). Especially if the high flow conditions are intermittent and somewhat...

Aptx489, By the way, it's possible to scale trended signals individually so that the trends are MUCH more understandable. I believe if you left-click on the signal name, a set of options will appear in the pane in the lower, left-hand corner of the Trend Recorder window, and you can select...

Aptx489, The plot thickens.... Thank you for the photos, but they really don't help with my understanding of the problem. I'm going back to my previous thread and sticking with my assertion that there is something amiss with one or more fuel nozzles in one combustor and that when the...

You should find the maximum allowable gas fuel supply pressure listed in Sect. 05.02.nn of the Control Specifications provided with each of the two GTGs. ('nn' refers to a sub-sub-section number which was not always the same for every unit--though the gas fuel section was always located in Sect...

You'll need to ask GE Belfort.

otised, Great explanation; couldn't have been spoken better! I'll wager that it (exhaust temperature spreads during diverter damper opening while Temperature Matching is going on whilst on Pre-Selected Load Control!) was dodgy before some maintenance and/or DLN tuning, or that some problem...

Dear, If I recall correctly (and it's been a very long time), the Orifice Constant was a value supplied by the orifice maker on a sheet of paper that listed all of the measurements of the orifice. You may be able to find some information on how to calculate orifice constants on the World...

Aptx4869, Thanks for the information, but there is still much we don't know. When did this problem with the LBO (Lean Blow-Out) and high exhaust temperature spread during TM (Temperature Matching) begin? Has it been ongoing since commissioning (when was commissioning, by the way)? Did it...

Is this happening on BOTH units? After a maintenance outage on both units? I don't have access to any Speedtronic manuals at the writing. But, you do. Appendix D of the Mark V Application Manual, GEH-6195, shows what card has what power supplies. my guess is something powered by the 24...

Chiranjeevi, I don't have access to any Speedtronic manuals or drawings at the writing, but if I recall correctly--from the PDOA section of GEH-6721, Vol. II, there are drawings of the discreet output circuits of the TDBT, and the first six of the twelve DOs (1-6) can be wet or dry...

sarfareumesh, >while running in parallel operation (not with grid), if I >put one machine at base load & change it's (base load >machine) power factor towards unity will MW output increase >for base load machine? We don't know anything about the nature of the load (lights, motors...

otised, Thank you for joining the thread! I have heard of a couple of F-class turbines with bypass stacks--but only to allow operation when the steam turbine and/or HRSG were unavailable. The fact that the unit has Simple Cycle and Combined Cycle modes would seem to lend credence to that...