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There seems to have been some kind of event that you are trying to understand.... If you would just describe the event and possibly provide some additional details that might be requested we might be able to help. But, let's just think about lift oil pressure and oil temperature and a...

Have a look at your L.O. and Hydraulic P&IDs and you should find that the hydraulic pump suction is "fed" by L.O. pump discharge; in other words, the hydraulic pump does not take its suction from the L.O. reservoir but is pressurized by L.O. pump discharge pressure. The Emer. L.O. pump (DC...

ppm, No changes to the AC input(s) required. The DACAs convert the AC input (grounded or not) to ungrounded DC. Simple as that. It's the DC supply that needs to be ungrounded (for the Mark VI). Sorry to hear about your power supply problems. When the battery charger is powering the...

Jose Orlando R., The "trip history" function of the Mark IV is not configurable; it is what it is. CSE Engineering, Inc., sells a PC-based HMI for the Mark IV that can be used to gather and archive data for Mark IV inputs and outputs and internal database signals. It would be much less...

Amir Islam, otised is correct; the "Performance Monitoring Package" instruments are basically used to calculate airflow--which is one parameter used to analyze turbine performance. The Packages were also provided with many turbines since the demise of the DataTronics system, and are even...

Yes. The DACAs convert the AC input to ungrounded DC output, and the TCPD selects the higher of the inputs. This should be explained/detailed in Vol. II of the Mark VI System Guide, GEH-6421, in the Power Distribution section (usually in the back of the manual). Please note that DACAs...

Ch Amir Islam, Your question is unclear. What constitutes a "Performance Test" at your site? Performance tests are usually done to ensure that a turbine is operating as efficiently as possible. Most turbines are provided with a heat-rate guarantee--not just a power output guarantee...

akhil kangath, Yes, there would be induction if the shaft were not rotated when AC was applied to the rotor, but voltage doesn't do anything unless you put in a Volkswagen and push it down the street. Power is amperes. Generators convert torque (applied to the generator rotor by the prime...

GTT, I did not get a chance to download the file. I've since been told there is a newer revision (GER-3620R--the last alpha character designates the revision; the "higher" the character (R is higher than K) the newer the revision). I would refer you to GER-3620; that's the "bible". I...

As explained above in this thread, "O" stands for 'Outer', and "I" stands for 'Inner.' No one can say for certain if any wheelspace temperatures at any given instant in time are good or bad. There are simply too many intangibles (how long has the unit been running (since it was last...

Muni, This is a question best answered by a knowledgeable valve manufacturer's representative, someone who, after asking a few questions to understand the application (information you have not provided--like, voltage/current available for actuation; pressure(s) to be opened against; service...

Omid, I believe the Maintenance Section of the Service and Instruction Manuals provided with each GE-design heavy duty gas turbine specify the periods for each inspection/replacement. If you can't find it in the GE Manuals, and you are an owner or work for a company that has GE-design...

Player, Can you please cite the standard which you are referring to? Is it IEC? ANSI? EU/TUV? Which body's or nation's or Corporate standard are you using to say a bipolar 50 mA device violates or fails to conform to?

Omid, I note you posted this same question to another World Wide Forum and didn't get any response there. Perhaps if you could explain "rotor integration"--it's a term I'm unfamiliar with, and probably others, as well.

The velocity vibration pick-ups (also called "seismic" pick-ups) on most GE-design heavy duty gas turbines have proved extremely reliable over decades. One of the reasons is that heavy duty gas turbine (and axial compressor) rotors are very large (have a lot of mass) and so when they start...

Andrey, GE publishes a LOT of documents about their Speedtronic, or Mark(c), turbine controls with some general information about turbine control (control, protection, and monitoring). Have someone grant you access to the GE ControlsConnect website (or, if you have an SSO you probably already...

Omer, So, you want to be a field engineer. It can be a very rewarding profession--both personally and monetarily. But, like everything in life: Half of knowing what you want is knowing what you have to give up to get it. Interviewers these days ask all kinds of questions, not just...

Michael Toecker, Be careful with your assumptions, especially where GE heavy duty gas turbine control systems are concerned. ;-) There are about as many variations and permutations of vibration monitoring on GE-design heavy duty gas turbines as eight people can imagine. And, lots of older...

It seems the problem is resolved.?.?.? You said: > Afterwards when ratcheting is taking place (not consistent) it is smooth,... Coast-down time is not related to hydraulic ratchet problems--unless there is a rub somewhere in the turbine that is causing the unit to coast down faster than...

DFoster, Thanks for the feedback--and the troubleshooting process you employed! Both are most appreciated.