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Ridha, Were all these things done in a "shotgun" approach--meaning, where they all done at the same time, or was each one done and then any change recorded before doing the next step? > So we proceed as follow to trouble shoot the problem: > -Replaced the 4 seismic sensors by other good...

"...suitable gain and null bias curr...." What are the gain and the null bias current values, exactly? If it's not possible to get less than a 5% error between actual, measured physical position (you are measuring actual physical position and comparing that to the reference when checking the...

Paragkumar, The Atmospheric Pressure inputs (there are usually three of them) are very critical to performance. The median selected value is used to calculate CPR: Compressor Pressure Ratio. CPR is a fancy CPD calculation. CPR is used for calculating exhaust temperature, and I believe it's...

Quite often when I encounter something like this, I sometimes come to learn that some manager or supervisor demanded that, in this example, TNR be driven down on low gas fuel pressure to try to prevent the unit from tripping on loss of flame. This kind of thing usually happens when during...

UNGKU KAMAL, I, too, searched the Internet after your post trying to recall what my twisted university professor tried to teach us about Lorentz Law. I'm as confused now as I was then. I'm even more convinced my twisted professor was just using it to confuse us--as he was very prone to do...

SB, control.com has a 'Search' feature at the far right of the Menu Bar. The GE-design heavy duty gas turbine control community has been pretty active here on control.com for a about a decade. Most questions--like this one have been asked, some many times, like this one. Try this thread...

David I'm sorry but I don't understand the last question at all. Asset managers have to deal with the situation that results from the way the units are operated. That's sometimes dictated by some contract or other requirement. Sure; asset managers would like to limit the number of fired...

l63fgl usually goes to a logic "1" when the gas fuel supply pressure is low. If the speed is below 95% what usually happens is that flame is lost because gas fuel supply pressure is decreasing or has decreased and gas fuel flow has decreased. TNR is driven by L70L (Lower) and L70R (Raise)...

David, The turbine is NOT on speed control during firing or warm-up. So the speed is not fixed and will--and does--change while in FIRE mode. During warm-up (and during firing) the fuel control valve is being positioned based a fixed values of FSR (FSKSU_WU and FSKSU_FI, respectively)...

David, If the turbine is experiencing loss of flame on transition from warm-up FSR to Acceleration FSR, that usually means the acceleration rate is too high. In other words TNHA is so much higher than TNHAR that FSR is driven to FSRMIN. And if FSRMIN is too low then the unit will lose flame...

What ABB described is a very lengthy and unnecessary method of temporarily disabling a vibration sensor that does not take into account redundancy or grouping. A single Control Constant change (the name of which varies with the version of Speedtronic) would temporarily disable the input and...

David, No; the self-sustaining speed of a GE-design heavy duty gas turbine does not equate to starting means top speed. In many cases the turbine is self-sustaining long before the starting means top speed is attained. In any case, it's not really about starting means speed versus turbine...

me, Most GE-design heavy duty gas turbines have variable Inlet Guide Vanes (IGVs) on the axial compressor inlet. These are used to control the air being drawn into the axial compressor, which also affects the axial compressor discharge pressure. As the IGVs open or close, the axial compressor...

me, One of the wonderful things about the English language is that words and terms can mean different things in different contexts. The turbine combustors, turbine section and exhaust (including any waste heat recovery steam generator ("boiler") in the gas turbine exhaust) must be purged...

Sriram Surya, If the synchronizing display has a synchroscope on it, it would be very unusual if the synch scope was not also visible on the display during manual synchronization. And, if it wasn't visible during manual synchronization then it would seem the unit was not intended to be...

me, And we just want to know which "purge" you are referring to: the start-up, pre-fire purge, or the purge of fuel systems?

UNGKU KAMAL, "Flux cutting" ac generators are usually called synchronous generators, or, alternators. Their efficiency--measured by their ability to convert one form of power (torque multiplied by angular velocity) to another (watts)--is usually better than 90% at power factors close to unity...

SB, As was said earlier in this post, one needs to be more precise when posting--not just with Engineering Units for REAL values, but also for Control Constant names.

Dear mohamad noruzi, Yes; I was remiss not to have included the units for the gain and offset. For all later Mark IV panels (not the early Mark IV panels), all Mark V, Mark VI, and Mark VIe panels the units would be PSIG/%TNH and PSIG, respectively. (Mark VI and Mark VIe are not...

sb The <b>ONLY</b> formula for P2 pressure reference I have ever seen is: (TNH * FPKGNG) + FPKGNO At 10% TNH, that would translate to a reference of: (10 * 3.3291) + 375.464 = 33.291 + 375.464 = 408.755 PSI <b>THAT'S OUTRAGEOUS</b> especially for a DLN unit<b>!!!!!!!!!!!!</b>...