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g.rajesh, I've worked on quite a few GE-design heavy duty gas turbines, and most of the sites that have problems with compressor bleed valve <i>actuators</i> use axial compressor discharge air for the pressure source. AND, most of them don't look after the poro-stone filter or the low-point...

After a maintenance outage, or an outage where mechanical work was performed on a gas turbine it's extremely common for manual isolation valves to be found in the wrong position(s). Usually this happens when some well-meaning operator or technician closes the isolation valves to prevent dirt or...

Amrit, There aren't too many things which can be done to increase the VAr capacity of a particular generator, that's a function of the design and construction of the generator. The D-curve represents the limits of the generator's ability to produce or consume VArs as a function of the ability...

Samson16, Have you tried using the 'Help' feature, or using 'Search' in the Toolbox manual .pdf file?

Kevin, What kind of facility is being built? What kind of equipment, or services, does you company provide to the facility? Is there any clue can be derived from the type of facility, or the location in the facility? The wonderful thing about acronyms is just about anyone can make one and...

khairi, Contrary to popular belief, the elements used in most L.O. Mist Eliminators require periodic replacement, and if not replaced they can become quite clogged. Is there a gage installed to measure the L.O. tank pressure/vacuum? If so, what does it read when the unit is at FSNL? I also...

khairi, Thank you for the feedback!

devendra, You really haven't provided very much information to be of much use in providing a meaningful response. Which value is higher? However, most of the time these problems happen because the two meters use two different sets of CTs/PTs for their sensing, and some "auxiliary" power...

khairi, Congratulations on finding the problem. The gap for speed pick-ups should be 0.050 inches, +/- 0.010 inches, for Speedtronic turbine control panels from Fuel Regulator to Mark IV. Mark V, Mark VI and Mark VIe turbine control panel speed pick-up input are much more sensitive, and...

Amrit, Is the grid voltage higher or lower than normal when the regulator is asking for more VArs? Does the step-up transformer have adjustable taps? If so, is the tap changer an on-line, or on-load, tap changer? If the transformer has adjustable taps, have you tried changing taps when...

Many newer Frame 7EA units use a hydraulic ratchet mechanism that rotates the shaft approximately 1/8th of a turn every 3 minutes when working properly. They employ a couple of limit switches to sense when the ratchet mechanism reaches the end of stroke (forward stroke; retraction stroke). And...

rvsaradhi, Per the original post, the flame detectors are located on combustion cans 2, 3, 7 & 8. How would a malfunctioning self-cleaning inlet air filter system prevent ignition?

khairi, Another thing--when firing the fuel pressure to each combustor fuel nozzle must be greater than the cracking pressure of the liquid fuel check valves, usually about 100-125 psig (check the Device Summary for the cracking pressure of VCK1-10). Use the manual selector valve handle...

khairi, Have you observed any liquid fuel coming out of the false start drains? That's the BEST way to see if liquid fuel is flowing into the machine during firing. I burnt liquid fuel will foe out of the false start drains. Does the exhaust temperature increase at all during firing? Do...

Twisted pair is not just any twisted pair. Use the proper cabling--and add the termination resistors. And you just might find--it works. Oh, and in the field, ground (earth) the shield drain wire properly--at one end only. Or you'll be thinking you weren't given good recommendations here...

Inst2015GE, I wish to inform you that it's only necessary to have current flowing through a single coil of a three-coil servo-valve to make the device being operated by the servo-valve move--<i><b>as long as the current flowing through the servo-valve is the proper polarity.</i></b> The...

G.Rajesh, You are free to use any switch, including a non-contact proximity switch, as long as the switch meets the zone/area classification requirements, and the voltage rating (normally 125 VDC, sometimes 24 VDC)--and, of course the temperature--always the temperature. If you can adapt a...

Neo, Unless I have an opportunity to work on a unit with MBC-based control, I'm not going to be of much help. And, as I'm hearing it's a "work in progress"--meaning it's in development. And, if I know GE they will keep tweaking this model because they are still learning the capabilities of...

I'm having trouble understanding the problem. Minimum pressure doesn't mean it always has to be supplied with that pressure, it just means that the lower limit of the range of acceptable supply pressure is "x" (5.5 barg; 80 psig). And most instrument/plant air compressors I've encountered run...

Neo, 1) Although I just recently received a printed copy of a GT Mark VIe running MBC I haven't really had the time to sit down and have a read. And, without any block help (if it even exists for MBC blocks) I don't know how much I'll learn from it. There's a bit of mumbo-jumbo in that...