Search results

khoriwal000, Are you absolutely certain that all air has been bled from the cooling water side of the AA pre-cooler? If the cooler was replaced in January of this year (2017), what could be the problem with the cooler? Was it a new cooler? Was it refurbished? Are you absolutely certain...

Please post a graph of: TTXM TTRX FSRT FSRACC TNHAR TNHA FLAME_INTENS_1 FLAME_INTENS_2 FLAME_INTENS_3 FLAME_INTENS_4 L4 (I don't know what the various flame sensor intensity signals are exactly for your machine, and if you would, please, make the pen widths of the machine with...

Aptx4869, To be specific, I should have said to trend both speed <b>AND</b> load all the way to full ST load to get the best data on all the paramaters. You can save the .trn (trend) file to the HMI's hard drive and review it at ANY time in the future. You can "hide" some parameters from...

Aptx4869, I strongly suggest you use this as an opportunity to use the Trend Recorder (Trender) function of ToolboxST to gather data on a properly working machine so that it can be used in the event of a problem or question later. Having trends of good start-ups of any turbine is just as...

Kashif_Qatar, The GE-design heavy duty gas turbine controls-related community here at control.com has been active for more than a decade (approaching a decade-and-a-half, if I'm not mistaken). In that time, we have covered a LOT of GE-design heavy duty gas turbine-related topics--mostly...

Prasad Parulekar, You don't make it easy to answer your question--by not telling us what part of the world you are needing this cable. But, perhaps if you told us where the site is that requires this cabling, sometimes referred to as twisted, shielded pair cable, or three-core/conductor...

Some Customers were absolutely furious when they learned the 7EA units with air--cooled generators did not have a D.C. Ratchet Pump, so GE retrofitted some units and made it a very expensive option for others, which some Customers purchased (but not many). There was several people who...

dkra, If I recall correctly, the GCV valve stem on the vertical combined SRV/GCV valve assembly is coupled to the GCV actuator rod and is not free to travel up and down when the valve is closed as is the SRV valve stem when the valve is closed. If the GCV was tested and did not leak down...

>>><b>CORRECTION<<<</b> >The key is to get >the highest wheelspace temperature down to less than >approximately 200 deg F--because bearing material begins to >soften and melt at approximately 300 deg F, so by getting >the highest wheelspace temp down to 200 deg F or below the >#2 and...

lemo, Are you asking if the 125 VDC battery--without AC power available for charging the battery--can operate the hydraulic ratchet system for as long as 48 hours? Because, when the hydraulic ratchet is operating there has to be lube oil supply to the bearings, and if there is no AC supply...

Chiranjeevi, Every control engineer worth his salt needs to know how to read and understand P&IDs--no matter how hard or difficult that might seem. GE P&IDs are among the easiest in the world to understand--and I know that because I read and study a LOT of P&IDs, not just GE P&IDs. To be able...

10_ac, What have you done to try to understand and resolve the issue? AND, more importantly, what were the results of your troubleshooting? Have you re-started the unit to FSNL (Full Speed-No Load) and checked the generator terminal voltage of all three phases? If so, what were the...

Chiranjeevi, CSRGV is the output of a MINimum SELect block/function in the application code. There are several different IGV references which all feed into the MINSEL block, and the lowest of the inputs becomes the the reference to the IGVs. At the point when the control transitions from...

Aptx4869, You are correct, TTRX is "constant" until it hits the "knee"--the point at which TTRX starts to decrease as CPD/CPR increases. But, fuel control is a function of FSRT, which is derived from TTRX. Watch the FSR Display on the HMI as the unit is loading. FSRT will start out at...

hakim, What kind of flame sensors are currently used on the Mark VI? I believe if you look in GEH-6421, Vol. II, The Mark VI System Guide, in the VTUR section's TRPG description, you will see how these Honeywell LG1093AA Geiger-Mueller type flame sensors can be connected to a Mark...

Hi Chemsouhd , The most likely cause of problems like this is that one of the servo currents from either <R> or <S> is incorrectly connected to its servo-valve coil. So, the current aids the fail-safe spring in moving the valve to the closed position against the other remaining coil. Were...

>Why there is no heat insulation in GE gas turbines? Why is there insulation on Siemens turbines? Pure and simple answer is: Design philosophy differences. Nothing more than that.

Just to add one thing--the valve's position is NOT controlled by the Mark*. As glenmorangie said, CPD (axial compressor discharge pressure) acts on the diaphragm in the actuator and causes it to move, shifting the source of the bearing sealing air. If you watch the valve during...

Aptx4869, The subject of exhaust temperature spreads and how they develop has been covered MANY times on control.com in other threads. And, in this case, GE has used their swirl angle charts to decide which combustor is having the problem. (And, from anecdotal accounts, it doesn't seem GE is...

LFord, Thank YOU for the feedback! It is most appreciated by all who read these threads because it helps others to know what was useful and what was not. We like to say here at control.com, "Feedback is the most important contribution!"(c) because it's true. Without the feedback we get from...