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I was pretty certain it was going to come to this. If it takes 25% of rated fuel flow-rate <i>just to maintain FSNL</i>, then this amount of fuel must be subtracted from any calculation of fuel versus electrical power produced to compare apples to apples--that amount of fuel is common to both...

DBOneill, You are correct; Pre-Selected Load Control will fight Droop Speed Control to maintain the Pre-Selected Load Control setpoint during a frequency disturbance when the unit is at Part Load (below Base Load or Peak Load). Pre-Selected Load Control can be used to change load, but when...

Mohamed nawar, Every GE-design heavy duty gas turbine control system I ever worked on came with a document (sometimes three documents) called the 'Control Specification.' That document detailed much of the operating parameters, expected and design, for the turbine and auxiliaries. Section...

I would estimate there would be a market for it, and many sites would find it useful. However, I can see one big problem. There are MANY names for a valve which regulates the downstream pressure. Pressure Regulating Valve; Pressure Reducing Valve; Let-down Valve; Make-up Valve; PRV...

Chemsouhd, >Lets talk logic now: If only we could do that (talk logic) about GE Belfort "logic." It's not, so we can't. L99??? LPGG??? That's just unconscionable. And illogical. Why even have signal names when they are screwed up--just like it seems the "logic" is? You need to go to...

Chemsouhd, >Another question if really we have condensation whats the >risk of damage on the machine if we force the logic? One quart of natural gas liquids (condensate) equates to approximately 10 MW of power. If that flows into a combustor or combustors the sudden ignition of that much...

khoriwal000, Try this: Open any .trn file. Select any bit of data, and don't zoom in on the data too closely. Then click on either the left- or the right cursor and drag it to the center of the data. Now, while watching the data values in the 'Traces' tab at the lower portion of the window...

k000, Post the .trn file--not a grainy, dark photo of one bit of data. From what I see you have set the left- and right cursors for approximately 0.040040 seconds--<b>BUT, THAT'S NOT 40 msec resolution.</b> The data does not appear to have been collected at a 40 msec rate. The data in the...

kl000, How many "failed" exhaust T/Cs is the machine currently running with? Would you please post the 40 msec .trn file to a web-hosting site and post the link to the file on control.com? It seems one respondent to this thread works for GE; perhaps that individual will provide a...

AbdulRehman, The HA technology is pretty new and I haven't seen much in the way of documentation about it's operation and operating modes. I would suggest that GE provided some training at the plant, and there are training manuals from that instruction around that you could access for...

khoriwal000, sir, The "interval" for a Trend Recorder session is adjustable (and must be specified or changed prior to the start of a data recording session), and I believe 40 msec is the fastest (because it can't get too much faster than the application code scan rate, probably, which...

khoriwal000, What you are seeing is most likely latency (delays) in screen updates. If you used Trend Recorder on the highest resolution (40 msec) you would even still possibly see some disagreements, but the calculation is what is shown in the block. HMI screen updates can take as long as...

khoriwal000, Can you please explain why you think there is a difference between the Mark VI calculation of TTXSP1 and the Mark VIe calculation of TTXSP1? I cannot read the very bottom of the picture where it talks about how 'k' is determined. But, it's determined from the total number of...

qhogan1, Thanks for the information! Glad the issue was resolved. Those pesky neutrals/earths/grounds, anyway.

Chemsouhd, Without being able to see the GE Belfort GE application code, I won't be making any further comment. As I've already said, GE Belfort code is usually by design unnecessarily and needlessly complicated, and while it may work well understanding it can be mind-bending. Trying to...

khoriwal000, You would need to tell us what the names of the blocks are (such as TTXSPVn, where 'n' is the version number) in Mark VI and Mark VIe, <b>AND</b> the Frame sizes of the machines, <b>AND</b> the type of combustion systems used on the machine with Mark VI and the machine with Mark...

Chemsouhd, So, you have a single-shaft "STAG", STeam- And Gas Turbines driving a single generator? To be quite honest, I have very little experience with such arrangements. The thing to remember about steam turbines in combined cycle applications (multiple-shaft or single-shaft) is this...

Barindra75, What happens when you change from gas fuel to High-Speed Diesel? As glenmorangie says, something is causing the Aux. Hydraulic Oil Pump to start. For most digital Mark* turbine control systems that something would be a pressure switch, usually 63HQ-1. Have you had someone...

Isulamu, The "fix" that GE sells allows the unit to over-fire when it's at Base Load AND the grid frequency decreases--BUT, they add a timer that keeps track of the time the unit is over-fired and that has to be factored into maintenance outage planning. By over-firing it is meant that the...

Isulamu, The plot thickeneth! I completely missed that you wrote you were working at a compressor station; I do remember you writing there were single- and two-shaft machines at the site--and wondered, but didn't specifically ask. My bad. But, at least now I'm beginning to understand (I...