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I don't understand the question. Presuming the cooling and sealing air flows are all correct (proper orifices installed in proper places) and the seals below the buckets and nozzles are in good repair and the turbine shaft is operating in the proper axial position, the wheelspace temperatures...

The Raise- and Lower Speed/Load switches change the Turbine Speed Reference (TNR) <b>regardless</b> of whether or not the unit is operating in Is<b>o</b>chronous or Droop Speed Control modes. When in Isochronous mode, changing the turbine speed reference will change the frequency at which the...

GE deems some pumps and fans as critical to turbine operation. So, as part of their operational reliability scheme they use normally-closed contacts of the Speedtronic relays that start & stop these devices to start & stop them. So, to start the motors the Speedtronic relays must be...

Mike brings up a point. I presumed the originator was talking about a complete loss of 125 VDC to the Mark VI, not a loss of 125 VDC to a single processor rack. (That impression might have been due to the use of all cap's for the posting!) If the Mark VI is SIMPLEX and power is lost to the...

Well if the 125 VDC supply from the 125 VDC battery was truly lost, then the question would be: Why? Was there a 125 VDC battery ground present before the loss of 125 VDC power? Did you find any fuses blown in the <PD> core, and if so, which ones? Did you find any fuses blown on any TRLY...

Devudu, There are several variations of Atomizing Air and Purge systems for F-class machines, some that don't even use the AA compressor during natural gas operation any more for energy savings (called, interestingly enough, 'Compressorless Purge'). So, to make a blanket statement about how...

I would add to this that trying to tune a pressure regulating valve for these kinds of flow-rates with no flow through the valve (which is what you seem to be saying you are doing), that doesn't usually result in very good pressure control, just as you have described. The first question I...

GE's implementation of CIMPLICITY for turbine control has never been a straightforward CIMPLICITY installation. Until the most recent versions of ControlST, there has always been at least one app running in the background (CIMBRIDGE or TCI) and the alarm display and the synchronizing display are...

You can try reading this and asking any specific questions after reading this thread: http://www.control.com/thread/1026224575

sirwan, What part of this reply to your previous post didn't you understand? http://www.control.com/thread/1270569765#1270612312

Dawei, This is not really a controls-related problem. You haven't really told us if the leaking is occurring at the compression fittings (Swagelok or Parker or similar) or where the body of the compression fitting is threaded into the check valve or fuel nozzle, usually with a NPT...

All very good troubleshooting steps, to which I would add the question: When did this problem start? Has it been ongoing since day one of the commissioning? Or did it start after a maintenance outage? A temperature transmitter uses some kind of sensor, a T/C or an RTD (not usually an RTD for...

See this very recent thread: http://www.control.com/thread/1266452920 It's not clear what you mean when you say the "circuit could not be checked." Electric? Hydraulic? You say it's continuously on "forward stroke"; is the jaw clutch continuously rotating in the forward direction...

VH14 is the device number for the Hydraulic Ratchet Self-sequencer. You can find this in the Device Summary drawing, where it lists the device number, a description, and the ML (Model List) for the Piping Schematic (P&ID) drawing where you can see a schematic diagram of the device in one of the...

First, there is no such thing as a Frame VI. There is Mark VI, and there is Frame 6. But not even a Frame 6 controlled by a Mark VI is a Frame VI. Second, you're close. Wheelspace is the area between the turbine "wheels" and the stationary turbine casing. The space is below the turbine...

Chaitu, Exhaust temperature spreads are not always related to fuel nozzles. If you are experiencing spreads on both fuels, and the exhaust temperature profile is basically the same on both fuels, it's not likely the fuel nozzles that are the problem. It's something else like a cracked...

Without atomizing air flowing through the system (at a reduced rate because of the Atomizing Air Compressor Bypass Valve being open), there is no cooling air flow through the atomizing air system, and it has been proven that without a positive air flow from the AA compressor when running on gas...

AS ABRS says, if the unit(s) at your site have gas fuel heaters (performance or start-up), this is another consideration which must be taken into account. I have seen sites where the sequencing or application code will reduce load during a fuel transfer when switching fuels if there are...

There must be something very particular about the PGT-10s at your site. Perhaps you could have GE help you understand what that is and then help us understand it, also.

The responsibility for making these kinds of decisions rests with those on site who have knowledge of all of the variables and intangibles that go into operating a plant. If the turbine is controlled by a Speedtronic turbine control panel, Mark IV or newer, then there is a signal called...