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rizwanhaider, So, you want to install a HDD LARGER than 4GB in the Mark V <I>, because you can't find HDDs smaller than 4GB for purchase. Have you looked on ebay or a similar site? You may have to settle for a refurbished HDD (many are in fine condition; I use them regularly, though not...

AAkhan, Great news! Thank you for the feedback! "Feedback is the most important contribution!"(c) here at control.com--it's the thing that let's others reading these threads what was useful, and what was not. So, by providing feedback you are helping others (LOTS of people read these...

MOmar91, I was able to look at the P&ID you made available; thanks. There IS a dual source for the compressed air for the GT and auxiliaries--axial compressor discharge/extraction, and an electric motor-driven compressor (I think the symbol on the P&ID is for a centrifugal compressor, and...

MOmar91, Thanks for the link. My anti-virus software won't let me access the location because it has detected the Trojan virus.... (Which is one reason why control.com won't let anyone post files to the site.) And, just for future information: Every GE-design Frame 9E heavy duty gas...

AAkhan, >Q1 After how much time we can turn off lube oil circuit for >addressing the leakages? Okay; so there ARE leaks at the check valves. That's "good" that the cause seems to have been located. You should keep the L.O. Pump running until the highest wheelspace temperature is less than...

MOmar91, All of the Air Processing Units (sometimes called Air Processing "Skids") I have worked on used for cooling and drying the air which is used for the self-cleaning turbine air inlet filter system as the air is drawn from the axial compressor discharge (often, it also had a pressure...

So, I'm presuming the gas turbine is a GE-design Frame 5 or Frame 6 heavy duty gas turbine with a Mark V turbine control system. When did this problem start? After a maintenance outage? After a trip from load? If it started after a maintenance outage, what work was done during the maintenance...

abinash, So, could you be more specific, please? Exactly what is the nature of the instability--is it speed (frequency) or load? Or is it reactive load (VArs)? Or is it generator terminal voltage, or generator field voltage/current? Or some combination of the above? How severe is the...

AAKhan, >Please share us the procedure for its removal if available. >It will really help us in complete understanding. Procedure? From GE--for something they would like to perform and charge you for? I have seen Aux. L.O. Pumps removed without draining the L.O. Tank, but it took some...

WOW!!! I made a TON of typo's in the above response.... I didn't use the 'check and preview' (rather I scrolled through the message in the editor and, obviously, didn't catch multiple errors. My SINCEREST apologies for any confusion--hopefully it's not too mangled to make sense of.

Michael, Good questions, and as with all things Mark* there are answers and there are exceptions to answers. If you've been reading threads on this forum you already know: There is no tool on the operator interface to "match" TC2KREPT.TXT and IO.ASG. AND, that TC2KREPT.TXT is an ASCII text...

Topcat, I've had a chance to think your question over and I don't think you were looking for a solution. Rather, you were questioning why the designer of Pre-Selected Load Control didn't automatically cancel it when the desired load was achieved, or give the operator the option to leave it...

AAkhan, >Is there a possibility to remove a pump without emptying the >Lube oil tank since only then we can check the condition of >foot valve? Yes. >Yes it can be the reason. But we need to empty the tank >order to access the discharge NRVs. Any other possibility to >access those...

Topcat, Most gas turbine operators seem to have a very narrow idea of what their job entails. For Part Load operation they believe all they have to do is enter the desired Pre-Selected Load Control setpoint and enable Pre-Selected Load Control and their job is done. I can't say why...

AAkhan, Thank you for the clarification. So, you are calling the oil pump discharge piping upstream of the bearing header pressure regulating valve the "lube oil header," and the piping downstream of the bearing header pressure regulating valve the "bearing lube oil header." That's fine...

The prime mover governor, acting in Isochronous speed control mode, will keep the frequency constant--as long as the load doesn't exceed the rating of the prime mover. The generator exciter (commonly called the "AVR", Automatic Voltage Regulator) will control the voltage. Some single...

AAkhan, Generally when someone says "lube oil header" in reference to a GE-design heavy duty gas turbine they are referring to the Bearing Lube Oil Header, and for most GE-design heavy duty gas turbines the Bearing L.O. Header pressure is 1.7-2.0 barg (25-30 psig). So, it seems you are...

sabtain, The Mark IV uses fixed-point mathematics. Not floating-point point maths we are most accustomed. Because the Mark IV was an early digital control system thr designers decided to describe the binary information for many control signal values, because troubleshooting without that...

Shyam, Perhaps someone else will choose to help, but you have not provided the data requested and the information keeps changing. It's clear you have some thoughts about what the problem(s) might be, and are looking for validation of you theory(s). You won't tell what the spreads are, you...

Jolek, and all, Tank you for catching that!!! My bad!!! The CPR or CPD increases from <b>LEFT</b> to <b>RIGHT</b>. My apologies for any confusion. [Hopefully the Kind Moderators can permanently correct my error.] <b>Moderator&#8217;s Note:</b> I fixed it in the first paragraph. Any...