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If your environmental authorities require the gas fuel system to be DLN, there is a strong possibility you will have to change the control to Mark VI or Mark VIe. Not to mention the impact of a rather large change to the combustion system.

There is a pressure drop across the superheater. The higher the steam flow, the higher the pressure drop. Normally, the drum safety valve will have a higher pressure setting than the superheated steam safety valve setting because the design pressure of the drum is higher than the design pressure...

It means adjacent by physical location on the turbine. So you can go by number, remembering that 1 is adjacent to 2 and to the highest number (not all machines have the same number).

Take a look at the performance curves for the unit. I think you will find that the lowest heat rate (peak efficiency) occurs at the design point. That says that any deviation from the design point will reduce efficiency. In general, the bigger the deviation, the greater the impact on efficiency.

Do not try to change the units in Toolbox! While it is theoretically possible to change them, there are too many opportunities to overlook something or do it incorrectly. Nearly all of the control constants would have to change. And you would need to be really careful with constants involving...

MS = Model Series. E.g., 5001 for frame 5, single shaft; 5002 for frame 5, 2 shaft. Can be followed by letters to show "revision" level. Usually, higher letters mean later revision, and more power output. Main exception to this was the 5001P and 5001R. The P was an upgrade to the N which itself...

Just a warning here: This ONLY changes the HMI displays. It does not change the units within the Mark VIe controller. Thus, if you are looking at the blocks in Toolbox ST, the units are still English units. The historian, if you have one, also will still be in English units.

This system goes way back to the original GE gas turbine controls, back even before Mark I SPEEDTRONIC. Since you are only asking about the letters, I assume you already know the numbers are from switchgear protective relay nomenclature. I do not have the GE "bible" for this - I left it...

Basically, a solenoid valve is a 2 position device - either full open or full closed, based on whether the solenoid is energized or de-energized. Typically, de-energized is the "safe" state of the valve, which is usually (but not always) closed. A positioner generally is driven by a 4-20 ma...

TMR stands for Triple Modular Redundant. I don't recall the full explanation of the differences between TMR and the Mark IV implementation of triple redundancy, but some of it is: In Mark IV, the redundant field sensors were divided up among the 3 control processors (R,S & T). R could only read...

>What is the diff between WHRB & HRSG< They are spelled differently. There is no functional difference.

You don't say what your DCS is, but most suppliers today have remote I/O capability. If yours has that capability, I recommend installing a small remote I/O cabinet at your local pump panel and then use a redundant fiber optic link to transmit the signals between the remote location and the...

My first guess would be that GT#02 IGV's are slightly more open than GT#01.

Since you are measuring a compressible fluid, you will also need pressure and temperature measurements. The pressure transmitter can also be calibrated with air, or with a dead weight tester. Temperature measurement typically is going to use a thermocouple which has a fixed calibration. If you...

Sam, I am a controls engineer, not a combustion engineer, so while I know the fuel specification is important, I can't tell you exactly which are the most important parameters. If it has changed from what was originally given to GE, then you should probably go back to GE and have them look at...

First you need to determine whether or not you are getting failure to fire or failure to detect flame. Have you looked in the inspection ports to see if any flame is present; or have you seen an increase in exhaust temperature? Is the atomizing air system OK (including booster compressor)...

Inlet pressure loss is the difference in pressure between ambient air pressure and the gas turbine compressor bellmouth pressure. It is mostly pressure drop across the inlet air filters and any silencers. Exhaust pressure loss is the difference in pressure between ambient pressure and the...

The exhaust gas flow is essentially the inlet air flow plus the fuel flow plus any water/steam injection flow. So after firing, it will always be greater than the inlet air flow.

It is possible that the Mark IV is simplex (maybe it was an upgrade to Mark I or Mark II or older), which would explain the single transmitters. But if so, why wouldn't you go to Mark VIe simplex instead of TMR?

The 2nd and 3rd digits, followed by an appropriate number of zeros give the approximate rated shaft horsepower at ISO conditions. In this case, 350,000 HP (260 MW). Note, this is GT shaft output power, not generator terminal output power.