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There are advantages to both types, and disadvantages as well. I've seen both types, though I more commonly see T/Cs used in the last 20 years. RTDs are, I've read and been told, better for low temperature applications, while T/Cs are better for higher temperature applications. RTDs...

Where is the leakage? From fittings on the hydraulic manifold? From around the Moog sero-valve? From the hydraulic actuator? I suspect this is one of the independent rotary Fisher Cam-Vee Ball valves. But without knowing where the leakage is originating from it's extremely difficult to offer...

6bturbinetech, About the only way to do this is to unbolt the LFBV from the piping so that one can see the valve plug and then check servo polarity. Unfortunately, when one changes the reference to the LFBV (either from AutoCalibrate or from a Demand Display) one is telling the LFBV to...

khoriwal000, I don't have any manuals myself, and if a portion of the Manuals is missing one should contact the packager of the equipment to obtain the missing section. I don't have access at this writing to provide exact details of what the various solenoids do, but from the information...

Mee Fogging (www.meefog.com) is one of the best places on the World Wide Web to find information and white papers (documents explaining in detail some phenomenon or feature). They have been in the business for a very long time, and have a lot of experience with both fogging and more recently wet...

khoriwal000, So, the best place to look for information about GE-design heavy duty gas turbines is in the Operation and Service Manuals provided with the unit. There are sections for each of the unit's systems, including the Starting Means, which have a few pages which briefly describe the...

Saul, The basic concepts of a digital (numeric?) generator exciter regulator (AVR) are exactly the same as those for an analog generator exciter regulator: one has to control the field voltage/current to control the generator terminal voltage (during synchronizing) and to control the...

cloftin, Many of the RVDTs used with Fisher Cam Vee-Balll SRVs had a different linear range than the LVDTs used on older SRVs and other devices. In some cases it was necessary to reduce the zero-stroke voltage to something around 0.5 VAC RMS, and the 100% stroke voltage was sometimes around...

Chiranjeevi, Mark VIe control systems are provided with a lot of new turbines, and the timers and counters are very important for some warranty issues. They don't want people willy-nilly changing the values of timers and counters. So, the values for most of the timers and counters are...

You're going to be surprised by this, but the allowable full speed-no load operating time is different for just about every steam turbine. The manufacturer decides what is allowable and what is not, and in some cases the actual installation also affects that ability or time limitation. And, some...

bil07, I should have also said that IBH should only be on when the IGVs are below approximately 62 DGA on a GE-design Frame 9E heavy duty gas turbine with DLN-I combustors . When the IGVS are above approximately 62 DGA the IBH Control Valve should be closed. So, if there is some need to force...

bil07, What are you trying to achieve by forcing IBH (Inlet Bleed Heating) OFF? What is the significance of 85 MW? Yes, IGV Exhaust Temperature Control is always ON with DLN-I combustion systems. It's necessary to keep the air-fuel mixtures and dynamic pressures in normal, controllable...

Chiranjeevi, Please post the L4DE and L69DE rings.

Hi, Chiranjeevi, Was the Mark VIe provided with the unit when it was new, or was the previous turbine control system upgraded to a Mark VIe?

Bil07, Because there is 1) so much air versus fuel in the primary combustion zone in Premix Steady-State combustion mode, and, 2) there is such a small diffusion flame in the secondary combustion zone when in Premix Steady-State Combustion mode the pressure in the combustors can fluctuate--so...

Vimal Gupta, When <b><i>jumpering</b></i> thermocouples one is essentially trying to fool the turbine control system and that has risk associated with it. One is gambling by taking a short-cut by not shutting the unit down to replace the failed T/C. And if the T/C that you choose to jumper to...

Glad to hear all turned out good! "Thanks for the feedback!"(c) It's the most important contribution here at control.com.

Dear Vimal Gupta, The philosophy <b><i>when jumpering failed T/Cs</b></i> is to jumper one that is adjacent to the one that has failed. It doesn't matter if it's in the same artificially created "area" because the Combustion Monitor just checks for adjacency. For example, if TTXD_12 failed...

Vimal Gupta, The concept is that one-third of the available T/Cs are connected to <R>, one-third to <S> and the remaining third to <T>. When the number of T/Cs is not evenly divisible by three, the remaining exhaust T/Cs have to be connected to one or two processors. Typically, in the case of...

Mastersv, <b><i>When did this problem start?</b></i> After a maintenance outage? After the hydraulic filters were replaced? What have you done to try to resolve the problem? Have you checked the hydraulic filter canister air-bleed valves to be sure they are closed? Have you checked the...