Search results

Chris W, By the way, flame must begin in one of the two combustors with ignitors, and then spread around the machine through the cross-fire tubes. So, if one or two combustors are lighting off it's likely one or both the combustors with the ignitors, so the cans should be warmer than the other...

Mr. Alexander, This is very strange; very strange, indeed. Usually, when I've seen something like this happen it's because something in the Start Permissive string drops out unexpectedly--and without an alarm--during the start sequence. Sometimes, it happens early in the Start sequence and...

benjovr, I'm not quite sure I understand the post, nor do I agree with the reasoning for replacing the DCCA card. >DCCA card needs replacement since it lost the display on the LCCB >card and would not boot up. I would suggest if the LCC display doesn't work, it's a problem with the LCC...

bil07, I can't understand the question(s). FU-28 is usually for 20FD-1 (does the unit also run on liquid fuel?). A ground could cause the fuse to blow, and that could happen if the insulation in the solenoid gets wet or "burns"/shorts to ground.

Chris W, Wow! Thanks for all the good information in response to all my questions! (I'm not accustomed to that....) If you have heavy white smoke (as opposed to vapours) coming out of the stack, do you see any exhaust temperature increase during firing? Another cause of heavy white smoke...

ChrisW, One more possibility.... What kind of liquid fuel flow divider does the unit have? A long, "single shaft" arrangement of ten individual flow dividers all coupled together? These arrangements have been known to "break". If the speed pickups are both located at the same end of the flow...

ChrisW, This sounds a lot like another current thread: http://control.com/thread/1434461126 Axial compressor discharge pressure is very low at low speed. It really doesn't start to increase very much above even 1 barg until shaft speed gets above about 80% or thereabouts. And, after...

bil07, >*If It Happened Didn't it trip TG ??? No; and because a large portion of the axial compressor flow was exiting through the compressor bleed valves the mass flow through the unit will decrease, which will decrease the CPD, probably slightly increase the FSR, and probably...

Sadiya, Thank you for the feedback! We like to say here at the control.com forum, "Feedback is the most important contribution!"(c) because it lets others who may read this thread next week, next month, next year--or three years from now--if you found the information useful (or not, as the...

Arun/kumara, Your troubleshooting method, while all too common, is completely, utterly wrong. The GSV (Gas Splitter Valve) feeds two manifolds: the Primary fuel nozzle manifold and the Secondary fuel nozzle manifold. These manifolds each feed fourteen fuel nozzles, and the flow through the...

Dear Roadz, Your post is somewhat unclear, in that you say the frequency and load of the ST when connected to the grid fluctuates wildly, and then you say that when the ST is generating 13 MW the MVar output fluctuates wildly. Your system is somewhat unusual in that in most combined cycle...

Jimbo76, This is an interesting new piece of information: >The unit did run on liquid fuel just a couple of weeks ago >with no issue. I'm on an oil platform just now, and we lost >produce gas, so the machine swung over without hesitation, >then back to gas, then back to liquid fuel, but...

elomoon, According to the original post, the <i>turbine</i> didn't trip, the generator breaker was opened "(tripped"). That's an important distinction. Loss of the MW transducer based on the information provided will only result in opening (tripping) the generator breaker, not in tripping the...

elomoon, The criteria varies depending on the length of time since the unit was shutdown/tripped. If the shaft is warm; if it's been on turning gear since the last shutdown/trip; if it's been at rest. You need to clearly state conditions the turbine/shaft is in when you're asking about...

Phuklom, Load- and frequency control is a function of the turbine control system (the "governor"). Island system voltage--and I'm presuming the Frame 6 is the only generator supplying the island load--is a function of the generator exciter (the "AVR"), <i>unless</i> the frequency is...

To the <b><i>friendly</b></i> moderator, I suggest this is a duplicate of thread http://control.com/thread/1434455693. >I have a question about generator of gas turbine GE Frame6 >which control by mark5. > >What if the generator operate in Island, but still in droop >mode. What will be...

Jimbo76, Are these the "traditional" dual fuel nozzles with the liquid fuel "cartridge" screwed into the fuel nozzle body in the center of the nozzle assembly, with the AA tip around that, and the gas fuel tip around the outside of those two? If so, are you sure the internals of the liquid...

The operator will be <b>VERY BUSY</b> making adjustments to the turbine to maintain a stable frequency as motors are started and stopped, lights are turned on and off, computers and computer monitors are turned on and off, etc. If the load is relatively stable, the operator won't be working so...

Sadiya, The total range for -20 MW to +40 MW is 60 MW. One-quarter (4 mA) of that range is 15 MW. When the MW transducer is at 0 mA, the Mark VIe will indicate -35 MW (-20 MW - 15 MW = -35 MW). The value of the failed Constant is much too negative; it must be less than -20MW, but more than...

Glenmorangie, Actually, I think a S109FB is a single-shaft STAG Frame 9FB. So your answer may be very appropriate. >I know you don't have a GE machine but below is GEs >comments from their Maintenance Manual. It all really >depends on how the machine was shut down and for how long. I...