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DFoster, The answer to your simple question is not so simple. So, please, be patient. I've tried to provide a little history (which I hope a knowledgeable contributor, otised, will correct, if necessary) to understand how the technology got to the point it's at today. It would help if it were...

DRP, Unless you have a very large plant with a lot of large pneumatic actuators that are constantly moving (remember: when actuators--air or hydraulic--are at a stable position there is virtually no air (or oil) flowing) then you will probably not use a lot of air. You will likely not rob...

DRP, Sorry I missed the Mark VIe part of your post. Was the Mark VIe an upgrade/retrofit of an older control system, or was it provided new with a new gas turbine?

DRP, most Speedtronic turbine control systems have a method for manually controlling IGV position--within limits, of course. You say you are operating the gas turbine in "CoGeneration mode" which is also called Combined Cycle mode, or IGV Exhaust Temperature Control Mode. If the gas turbine...

DRP, Many GE-design Frame 6B heavy duty gas turbines have extractions from the compressor discharge casing to supply air to a plant for pneumatic control applications (instrument air). It would necessary to review the drawings of the compressor discharge casing/combustion wrapper to see if...

kwaku, Thank you. I'm more confused, though; sorry. If the compressor bleed valves weren't 100% open (which is when the open-position limit switches are supposed to be set to actuate) then it should hot have been possible to start the unit without forcing logic. And, if the bleed valve...

In general, people with mechanical backgrounds make better control engineers than people with strictly a controls background. And, I believe that a commissioning engineer needs to have both experience sets because they have to understand how plant equipments are supposed to work, how they are...

Kwaku, Thank you for your response! Again, I don't have access at this time to any GE P&IDs, but I'm not recalling any check valves in the atomizing air supply lines to the fuel nozzles of a Frame 7E/EA with conventional combustors (i.e, without DLN combustors). And, I'm not even recalling...

Mohsen, I am not familiar with Siemens units and the particulars of their control schemes. It sounds as though the unit might be exhausting into an HRSG and the IGVs are being modulated during unloading to maximize exhaust temperature. Sorry I can't be more help.

Mohsen, We have no idea what kind of turbine you are going to be simulating or installing this equipment on. Some manufacturers do things differently than others. Most of my explanations are of how GE controls their conventional combustor-equipped heavy duty gas turbines. I have an impression...

CuriousOne brings up a possibility, but the quill shaft would have had to have broken after the successful run because the unit would not have run at load without the main atomizing air compressor. Most people never look at the exhaust stack for signs of smoking, but, if there was...

Mohsen, Sorry; forgot to include this link to the other thread: http://control.com/thread/1372017375

Moshen, Are you monitoring this control.com thread? (Not that I think it's really heading in a great direction; but it is relevant to your latest question.) It all depends on how much "accuracy" you want to have in your calculations. If it were me, I would be contacting the...

I'm sure you can find many mathematical formulas on the World Wide Web using your preferred search engine. Let's try a slightly different approach. Why is electricity produced? So that torque can be transmitted from a place where is it "available" to distant places where it is not available...

Mohsen, If you go up to otised's response earlier in this thread, you have the best answer to your dilemma. Tina and I just tried to explain how a typical gas turbine is configured to operate at "full" power output during different ambient conditions while still maintaining optimal hot gas...

Venkat, What you are looking for is what's commonly called a "trickle charger" to keep the 12 VDC battery charged between operation of the Genset. They are very commonly available for many different types of applications, from automotive batteries to motorcycle batteries. They operate on...

ebrahim, I believe I have seen "opposing" helical grooves on opposite slip rings and there were no problems with brushes breaking or overheating or excessive vibration. But, I seem to recall that the brush holders were not arranged similarly for the two sets of slip rings--which is what...

Kwaku, When a turbine trips, the GE "standard" is there should always be a Process Alarm to indicate precisely what tripped the turbine. Now, unfortunately, that isn't always adhered to by factory or field personnel--but whenever a turbine trips the operators should be capable of reviewing...

Moshen, If you wish to call the temperature of the hot combustion gases entering/leaving the first stage turbine nozzle "TIT", that is your prerogative. At least one gas turbine manufacturer chooses to call it "firing temperature" (which is NOT the same as "flame temperature"--which is where...

causeur, You can use the I/O Report (ASCII text file, F:\UNIT1\TC2KREPT.TXT), and look at the <P> core section to find the device connected to the PTR1 output. You can also use the I/O Assignment file, F:\UNIT1\IO.ASG (also an ASCII text file) to search for PTR1 to determine what device is...