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If something I said in my earlier reply implied that protection signals should be connected over a data link, then I erred. Protection interlocks should always be hardwired unless there is absolutely no other way! Your description of the protective trip signals from the DCS to the Mark V is...

I am assuming this stack damper is only closed when the gas turbine is shut down, for the purposes of bottling up the HRSG to retain heat and (maybe) to keep rain out. Next, is the Auma actuator set up so it cannot close if there is significant airflow through it? (Recommended practice)...

I am not sure if there is another definition of ICS, but GE has a control system for power plants originally based on the Mark VI Speedtronic turbine control system, and currently based on the Mark VIe turbine control system. ICS stands for Integrated Control System. The Mark VIe version...

What you need are drawings and documents specific to the site you will be working at. If you have already accepted a position at this site, the utility may be willing to provide you with electronic copies of the following documents: T202 - (PDF file) which provides the control logic...

I suggest you start with the GE Oil & Gas web site, and find the particular product or service you are interested in. You should be able to find a link to contact the appropriate sales office. http://www.ge.com/products_services/oil_gas.html

For another take on this, taken from one of my prior replies on this subject: Maximum gas turbine speed is determined by the physical size of the unit. Basically, it is a function of the tip speed of the buckets and compressor blades. It must be kept subsonic. However, higher speed translates...

The runback is not to limit turbine inlet temperature (also known as firing temperature), but to limit peak flame temperature, which will limit NOx emissions. The requirement is not imposed by GE, but by whatever authority governs environmental impact at your site. So, if you need to run at...

A GE 9FA is certainly capable of more than 75 MW without water injection UNLESS it is required for NOx control and you are not allowed to operate without it. At ISO conditions (sea level, 15 degC inlet air temperature) with DLN gas fuel system it should be capable of at least 200 MW.

NOTE: My answer assumes that triple redundant transmitters are only used for critical control loops and protection loops. Also, the transmitters are installed in such a manner that a defective transmitter can be safely replaced while running. Therefore, any failed transmitter should be replaced...

You should clarify what type water injection. The type just described is also called evaporative cooling. There are 2 other types, involving water injection into the combustors. One is done for power augmentation the other is done for NOx reduction. Both of these will increase power due to...

Why do you need further reasoning? 4 to 20 ma was the agreed upon industry standard (surely you don't want every manufacturer using different ranges!). Actually, the original electric signal that replaced 3-15 psi instrument air was 10 to 50 ma. That usually needed a 30 to 40 volt power...

One reason may be that the unit was designed with black start capability. If so, since this motor is only briefly used during startup, at a time when the only AC power available would be from an inverter, DC was the only realistic option.

Drum level settings are set by the boiler manufacturer. If you run at 20%, assuming this is above the low level alarm and trip levels, you will be more likely to get the low level alarms and trips. The alarm and trip settings are set to provide sufficient time to trip the unit without running...

GE sold the GEMAC instrument line to Bailey Controls (now ABB) back in the early 1970's. I don't know if ABB still supports this line. MV/I transmitters (also known as temperature transmitters) are available from other sources - Google temperature transmitter. However, what you have is likely a...

iqbal, Some things to check: Wiring - check condition and routing of the wiring to the scanners. I recall a problem (many years ago) when the wiring to one of the scanners got too hot and flame indication was lost. Test - try swapping the connections at the control panel to see if the...

Mark VI Speedtronic is a GE turbine (gas and steam) control system. The current version is Mark VIe which has features that make it look more like a DCS than previous versions. Still, it is primarily for gas and steam turbine, HRSG, and balance of plant control in simple cycle or combined cycle...

You say "We have two Frame5 LA machines with MarkVie control. recently commissioned." These are rather old turbines that would have originally had a fuel regulator control, not a Speedtronic control. So please clarify as to what was recently commissioned. I assume it was the Mark VIe...

I don't think EGD is used on the IONET Ethernet. I know it is used on the UDH and PDH. And, in addition to what has previously been stated, it is also used to pass signals among the different controllers (on the UDH). While there is not too much of this in simple cycle applications, it is done...

Think of this more as a wave traveling down the transmission line from the generator to the motor. The generator terminal voltage is rising and falling to produce the 50 Hz wave, and the voltage at the motor terminal 600 meters away would be following this delayed about 0.1 millisecond IF the...

One other advantage for Mark VIe is that in addition to simplex and TMR architecture, there is now dual redundant processor architecture available which GE uses for HRSG and balance of plant control on combined cycle applications. The gas and steam turbine controls remain TMR. Also, maybe I'm...