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>> at -40 F the only thing you have to worry about is the capacity of your gearbox >Don't you mean -40 C? Actually, -40F = -40C.

> Water injection is used only for liquid fuel and how is SOx (CEMS) controlled during liquid fuel firing and NOx > controlled during NG firing? can you please explain in detail about SOX and NOX control. AK, I'm not sure I can help you very much - I'm a controls engineer, not a...

Water injection is used for liquid fuel because there is no DLN system available for liquid fuels (at least on GE gas turbines). So water injection is used to limit peak flame temperature.

OOPS! I read your original posting too quickly. I thought you meant speed/load setpoint, but now I see you said "speed." If your 52G is closed to a grid, you are unlikely to be able to change speed. If you are running isolated from the grid then you can change the speed with the RAISE and...

Go to the load control screen on the HMI and use the RAISE or LOWER "pushbutton." This will take the load control out of preselected mode and leave it in manual mode - the FSR should remain steady, the load will change as ambient temperature changes. Alternatively, you can RAISE of LOWER the...

One comment on 14HS setting in the following statement by Bob Johnston: > 2) Getting 14HA is OK as it usually set around 50% speed, is it doing anything? > You won't get 14HS to at least 95% speed. The 95% setting is correct if the turbine is a 5001P. If it is a 5001R, the setting might...

Before the "corner" point (on the horizontal part of the control curve) the firing temperature is less than the limit. The horizontal part, also called the isothermal limit, is there to protect the exhaust system components. If you study the software code for the control, you will see that the...

If you leave the low pressure port of the DP transmitter open to atmospheric pressure and connect the high pressure port to the pressure vessel, you will have a gauge pressure transmitter. You need to be sure the DP transmitter has a differential range that extends up to the maximum gauge...

The square root extraction should be done AFTER the density (pressure & temperature) compensation is applied to the differential pressure measurement. If you look at the flow equation, you will see that this is under the radical with the differential pressure. So unless you have a smart...

It is a mistake to assume that because the gas turbine is capable of more power output at low ambient temperatures that it is more efficient at those temperatures. If you look at the performance curves provided by the manufacturer, you will see that the heat rate also increases as the ambient...

You didn't list the manufacturer of the GT. For GE design gas turbines, the emergency lube oil pump is sized to protect the bearings during coast-down and cooldown following a trip. This is why the setting of the pressure switch that turns on the EOP (63QL) is set lower that the pressure...

On item b., low trip oil pressure. The main purpose of this is to trip the electronic control in the event of a mechanical trip - either mechanical overspeed bolt or the manual trip lever. Basically, while any of the trips in the Speedtronic control will dump the trip oil, the "low trip oil...

> Is it possible to turbine reach at base load (FSRT minimum) at 25 MW, if IGV > temperature control mode is ON. > Kindly reply, as i need to answer this urgent. At true base load condition the IGV's need to be full open (86 degrees in your case), even if you have IGV temperature control...

>> I am confused. You've replaced the PROM (or EPROM) or the EEPROM? >> They are totally different things. PROM is non-volatile while EEPROM is volatile memory. EEPROM is Electrically Erasable PROM - it is not volatile! It would be similar to today's memory sticks. It can be erased or...

The 120 psig trip oil system on the older frame 5 GT's was from the lube oil system. There was a separate feed upstream of the lube oil PRV.

You need to clear some things up - like how old is this machine and what type of control is on it? The older 5001N and 5001P machines had a separate hydraulic trip oil system (I don't remember exactly what the nominal pressure of this system was, but 120 psig sticks in my hazy mind). If you lose...

If there is any load on the turbine I think it will trip on high exhaust temperature before it gets to overspeed, regardless of whether the load is a generator or a compressor or pump. I am slightly less certain if it is a generator drive at FSNL (breaker open) at the time of the GCV going full...

A slight clarification: I believe all Mark IV's that were provided with a new gas turbine were triple redundant. Technically, none are "TMR" - true TMR didn't happen until Mark V. (True TMR requires that the R, S and T processors be able to read the I/O from each other; Mark IV R, S & T...

For each relay, there are 2 voltages and 2 currents to consider: 1. COIL voltage and current 2. CONTACT voltage and current If you fail to heed the ratings of either you will either destroy the relay or it will fail to operate. The COIL is what you energize using your driving (or...

If you are going to open either the SRV or the GCV or both with the machine shut down, I hope you are planning on closing an upstream shutoff valve to prevent fuel from flowing into the turbine!