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Rotimi88, I'm glad you find this thread useful and informative--you started it! However, there is still not enough information to be useful to begin to try to understand why the IGVs might be moving when ambient temperature is "high" (personally, I don't consider 30 deg C to be that high...

Isulamu, The original post is unclear. You are correct; CTIM may change the turbine speed at which the IGVs begin opening, but it doesn't change the angle they open to. And this only occurs during acceleration when starting. Since turbine speed can't be controlled below ~95% this doesn't seem...

gadouche, Thank you for the feedback. Please write back to let us know what you find as you progress in your troubleshooting.

gadouche, So, it was aligned--and it seems okay. What does that mean--it seems okay? The vibration has gone away? The alignment seems okay, but the vibration still exists? Was it aligned when the new torque converter was installed, or after the new torque converter was installed? Yes; by...

rotimi88, >This is my query to your explanation as per Bleed valves >function with regards to the IGV during shutdown. I am with >GE frame 6B P&ID, AND what I am seeing here with me is that >the Compressor bleed valve VM15-1 and VA20-1 are only taking >compressor discharge air flow to the...

rotimi88, >Please, is IGV Modulation ever a function of CTIM >(Compressor inlet temperature)? For a GE-design Frame 6B heavy duty gas turbine--not usually. There are some machines which can modulate IGVs based on very low ambient temperatures (which will make CTIM be very low), but...

gadouche, Do you know why the first torque converter failed? These torque converters were typically manufactured by TwinDisc Corporation, if I recall correctly. They are pretty bullet-proof as many are regularly abused and poorly maintained. Some torque converters have filters on the...

JmarkV, Thanks for the feedback! >This is a good point... I could not say for sure that the >unit was not on a ratchet sequence while performing these >checks so I forced the unit on cooldown while holding one of >the valves at 50%. The core did drop once, but then I could >not get it...

JMarkV, I believe every AutoCalibrate display shows TNH towards the bottom of the display. What does TNH do when this happens? Newer Mark V PROMsets used TNH < 27% (I think that's what it was) as a permissive for allowing AutoCalibrate to be enabled. And, there was a logic signal...

davidmcc, If the Mark V software CSP (Control Sequence Program) is not energizing the field flashing discrete output, then the VIEWn tools or Short Term Trending would catch it. All you need to do is start the program every time the unit is started--not too difficult. Oh, and remember to stop...

davidmcc, >We looked into the wiring and software and couldn't find any >fault. This is the crux of responding to your posts. You say you've troubleshot, but you won't say how and you won't say what the results were--only that you were satisfied that there is no issue with [this] or...

There is a school of thought (backed up by data) that says that higher fuel gas temperatures result in a better overall heat rate (cold gas fuel being injected into the combustors through the fuel nozzles cools the combustion gases and requires heat to warm up the fuel and maintain combustion...

The statement/qualifier about shutdown is confusing. There must be air flow through the combustors in order to establish flame during start-up even though the compressor bleed valves are open. Only a portion of the air flow through the forward part of the compressor is redirected-directed...

>Please tell me the reason behind IGV degree angles being >limited to 34-86dgA range? is it related to blade design and >shape? The axial compressors were designed to have minimum flow occur at 34 DGA, and maximum flow at 86 DGA. During starting (purging and firing and acceleration) and...

rangacharya, >If there is sufficient margin available in prime mover and >steam generating unit, then what limits the overloading of >generator, say up to 10% or 20% of the rated capacity? The prime mover governor is configured to protect the generator, and possibly the load coupling...

I'm in agreement with oneye14--it sounds like you haven't been given much direction. In my experience, SOP means Standard Operating Procedure. It's mostly for plant operators. It could mean Standard of Procedure at your plant, and for the I&C department that would generally seem to refer to...

So, most everyone assumes when an exhaust temperature spread is increasing or develops the problem simply MUST be the turbine control system! After all, just look at all those wires and flashing LEDs and cables--the problem surely must be in the turbine control system. Well, when they get...

dannys, >So when i later check a running unit, i found out that the >logic for l33cb1o and l33cb2o is "0". The compressor bleed valves MUST be open during starting (prior to a START), and during shutdown. That's why there are limit switches to indicate when the valves are open. And, the...

dannys, >is it applicable to l33hr and l33cs? looking forward to hear >from you. Are you providing the ENTIRE signal name? Because l33hr is usually l33hr<b>f</b>, and l33cs is usually 33cs<b>e</b>. In these two specific cases, the inputs are typically NOT inverted, and--again--the...

I endeavour NEVER to assume anything. But I am human, after all. Look, these two inputs are rarely inverted. The switches are actuated when the valves are closed, and so that means if the inputs to the Mark* turbine control system are wired to the normally open contacts of the switches the...