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Isulamu, This topic has been covered before on control.com, but it has been several years. The purpose of the SRV (Stop-Ratio Valve) is really two-fold. First, it is the gas fuel stop valve--or it was for decades, until newer gas system standards and regulations in some parts of the world...

<b>>>CORRECTION:<<</b> >So, when >there's zero pressure on 63QA-1, L63QA should be a logic >"0"--indicating low L.O. pressure, ... That should have read: So, when there's zero pressure on 63QA-1, L63QA should be a logic <b>"1"</b>--indicating low L.O. pressure, ... Sorry for any...

AAkhan, I want to add, before you ask, that there is NO SET RECOMMENDATION for when to perform an off-line water. It depends entirely on the type of contaminants (dust; dirt; soot; hydrocarbons; etc.), the amount of humidity in the air, and the condition of the filters and the attention paid...

Here's the very best thing you can do for yourself. Find out where the Operations & Service Manuals that were provided by the packager of the turbine-generator and auxiliaries are located. Start with the first binder/volume, and take it to a quiet place, and start paging through it. The early...

AAkhan, Nothing is easy with you. And, the information you provide seems to be inconsistent, too. Axial compressors do foul--and dirt/dust can cause the fouling. But not all dirt/dust is the same. There is dust from roads; there is dust from nearby cement plants, or gravel pits. There is...

qhogan1, Wow. GE typically uses modified ANSI device numbers which are of the form 63QA-1, for example. 63 is a pressure switch, Q in the first place for GE-design heavy duty gas turbine refers to the L.O. system, the A in the second place refers to Alarm, and the -1 means it is first the...

Aakhan, The biggest reason for axial compressor bleed valves failing to close completely is moisture in the air used to actuate the valves. MOST GE-design heavy duty gas turbines use air from the axial compressor discharge to actuate the axial compressor bleed valves. That air can have a lot...

Vhendrayawan, I don't know how the sensor measurements in the graph are taken, or what the sensitivity of the measurement device ("tachometer") is, which would have a great effect on the measured output. I don't recommend going to 0.050 inches, but I can tell you that the same sensors work...

vijaycontrol, >1. Need clarity about relationship b/w P core and Q cores. <P> is the Protective core, and <Q> (<R>, <S> & <T>) are the redundant control processors. To my knowledge, there is no "control" done in the <P> core, with the possible exception of the auto synchronization...

bil07, Sorry to hear you have a Belfort-packaged GE-design Frame 9E. It's a great turbine, but when Belfort gets involved the auxiliaries can be a mess. I think you meant to say that when the unit is on cooldown 88TG (the turning gear motor) and 88<b>QA</b> (the Aux. L.O. Pump) are...

Vhendrayawan, Thank you for the feedback. I purposely mentioned the sensitivity of the Mark VI/Mark VIe speed pick-up inputs (including those of the liquid fuel flow divider) because it's a real problem for older machines upgraded/retrofitted with newer control systems. In the Mark IV...

Do you have a back-up to recover from? Have you tried changing the name of the file created by the upload? (I don't have a copy of ToolboxST to test this with, but I'm just wondering if it's that easy.) Why were you uploading?

bil07, ANY motor tripping should be cause for concern. 88QV is driving the Lube Oil Mist Eliminator fan, which draws lube oil mist from the Lube Oil Reservoir and drain piping, condenses the vapours, and prevents (to the extent possible) hydrocarbon vapors from being discharged into the...

MOmar91, If you would put your Hydraulic System P&ID up on, say, DropBox or OneDrive or Google Drive, and then post the link to the drawing in this post we might be able to make a more reasoned assessment. In my experience with GE-design heavy duty gas turbines--prior to Belfort getting...

I failed to mention that the Accessory Gear-Driven Main Hydraulic Pump is still providing flow and some pressure even after the Aux. Hyd. Pump is shut down, and along with the Hydraulic Accumulator will also work to keep the hydraulic system pressure from decaying quickly on a shutdown.

MOmar91, It would be necessary to see the Hydraulic System P&ID to be absolutely certain of what's going on, but most people don't realize that the hydraulic systems of GE-design heavy duty gas turbines are really pretty static systems. What that means is that pressure is present during...

Thank you for the feedback!

Djafer, Thanks for the feedback! Glad to hear your problem was resolved.

Vhendrayawan, I can't address the allowable run-out specifications, but I do have a couple of suggestions. (Roper has always been very helpful when I've contacted them for assistance; I suggest you contact them for their recommendations on when maintenance should be performed, and possibly...

waltrobinson, Thanks for the feedback. Are both <G>s configured to get MODBUS data? Moving the <G>s to <D> likely wouldn't resolve the "loading" issue of the MODBUS requests from <C>. <D> still has to get the information from <C>, and the TCCB. Please write back to let us know the...