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Please have a look at the Gas Fuel or Fuel Purge Piping Schematic (P&ID) drawing to see the details of the gas fuel purge valve<b>S</b>. If you have a standard GE-design Frame 7E or 7EA machine, then there is--or should be--a double block and bleed valve in the gas fuel purge line. This puts...

Fazal, You didn't tell us what kind of Gas Turbine might be experiencing this problem.

Re-read your original post. You are asking about how to calculate the optimum <b>speed</b> (singular) for a <b>two</b>-shaft gas turbine. Two-shaft gas turbines have two shafts that spin at two different speeds (plural). Which shaft, or shafts, are you trying to calculate this "optimum"...

Try contacting Bob Johnston at the email address in this link and ask if he would be kind enough to send you the information he has. Easier than to try to explain from scratch here. http://www.control.com/thread/1026239983

Great news! Best of luck going forward!

Physics down to that level ain't my thing. You can find many others here who would be happy to provide formulae or speculation or downright incorrectly inferred anecdotal data. You will have to decide which is which. I suggest using your preferred Internet search engine and looking on the...

Zafar Mahmood, If you wish to communicate off-line with Phil Corso ([email protected]), <i>you</i> need to send <b>him</b> an email with some information about yourself (company/school affiliation, primarily) and then he will decide if he will correspond with you (or not). As Mr. Corso said...

Gowris, There are all kinds of sensors available for all kinds of applications. Many valve manufacturers have developed different methods for sensing valve position on their valves. You haven't told us if you need precise position indication (0-100%), or open-closed indication, etc...

Thanks for the information, RK. A quick search using your preferred Internet search engine would tell you that oil can be a conductor. Some mineral oils are used as insulators in transformers, but in general, oil can conduct electricity, just not very well. I have troubleshot grounds and...

This question should be asked of and answered by the generator's manufacturer. We can't really answer this question without knowing a lot about the generator, it's cooling system, and it's operational characteristics. Generator efficiency isn't affected by load factor to any great extent...

I mis-spoke, again. The sentence below is incorrect. >If there is poor >atomization of the liquid fuel (such as >caused by coking of the liquid fuel >nozzles) then the smoking could be >darker than normal. If the fuel is poorly atomized, usually it will result in white smoke, not dark...

> When the bleed valve opens at 30Mw, flow from bleed valve blocks exhaust > flow. That yields increasing in exhaust temperature. Then IGV may start to close > to decrease exhaust temperature. Huh? When the axial compressor bleed valves open, it reduces the total flow through the axial...

Sir! IBH (Inlet Bleed Heat) is not generally used with machines that do not have DLN combustors. Or, IBH is used primarily with machines that have DLN combustors. If IBH is used on machines with conventional combustors it's generally used to provide inlet air heating in very cold ambients to...

Mxromen, What kind of vibration sensor? What version of Speedtronic? Which terminal boards were the vibration sensors connected to? Were IS barriers/zener diodes used in the circuits? As for "shorted" T/C inputs, you can place a copper wire jumper between the two T/C input terminals...

I don't know why people just freak out when they see "hydraulic symbols". It's like they are the devil incarnate, or something worse, even. If you have a machine packaged and provided by GE, you should be able to find in the drawings and instruction (service) manuals provided with the unit a...

The searches you have done should have indicated the most common cause of the indications you showed are the result of poor re-insertion of the T/Cs into the wheelspaces. It's physically impossible for there to be such a high differential between two T/Cs measuring the temperature in the same...

c^2, Have you seen this on Speedtronic turbine control systems? If so, can you be more specific about which version of Speedtronic and which cards in that version of Speedtronic?

Which terminal board and which terminals is the device connected to?

SalemGeek, Please note that the main reason for exhaust temperature spreads caused by liquid fuel system components is low pressures, not high pressures. A high pressure would indicate some kind of blockage. This usually occurs when there is coking of the liquid fuel nozzle because of poor...

It's not an "either/or" proposition. An LFBV will always have flow divider feedback, just as an SRV will always have P2 pressure feedback. As has been said in other recent posts on control.com, LVDT feedback was thought to be necessary on LFBVs when GE went from Frame 5s to Frame 7s, where...