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ABDI, I haven't read GER-4189, so I can't comment on the specifics of the document. But I <b>CAN</b> tell you that some units in combined cycle application use various methods of heating natural gas before it enters the combustors. This is done to improve the gas turbine heat rate (it...

MIKEVI, Yes, there is some time delay between when Pre-Selected Load Control (or External Load Control) would change TNR as load changed in response to a frequency disturbance. That's because TNR is ramped up and down at the selected ramp rate for the chosen operating mode (in this case, it's...

Ali Shakarami, Using my preferred Internet search engine and the search term: "convert vibration measurement from peak-to-peak to RMS" (without the double quotes) the first result was: http://www.vibrationschool.com/mans/Plots/Plots03.htm I seem to recall some information about...

Abbernardo. The work om the transmission system should not affect the load on the unit--unless the grid frequency is being affected. And I have a difficult time understanding how the grid operator would allow this to happen. EVERY time I have revealed the name of the Control Constant GE...

KADDOURI, The axial compressor bleed valves are not, technically, part of the Mark VIe turbine control. They are opened and closed by air pressure which is controlled by the position of a solenoid which is energized/de-energized by the Speedtronic (Mark I, Mark II, Mark IV, Mark V, Mark VI, or...

ABDI, There is a low-point drain in the atomizing air piping--both the inlet piping to the suction side of the Main Atomizing Air Compressor, and on the discharge (outlet) side of the compressor. When the unit is shut down, remove the pipe plug from the drain weld-o-let and see if any oil...

K.R.Manish, If you receive a dispatch to operate at, say 25 MW on a 40 MW machine, you can use Pre-Selected Load to load (or unload) the unit to 25 MW and then simply click on RAISE- or LOWER SPEED/LOAD one time to cancel Pre-Selected Load. That's all need be done. The turbine speed reference...

Dear Abbernardo, Pre-selected Load Control is a very poor mode to operate a GE-design heavy duty gas turbine in. The Speedtronic is still in Droop Speed Control and so when a frequency concussion occurs the first action the Speedtronic will take is to adjust the load in response to the...

Theophilus Tetteh Ahia, Things that make one go, "Hmmmmmm." Designers have to make a choice: clockwise or anti-clockwise. There's a story that says the designers wanted to make the parts not interchangeable with other turbines. There's another story that says that many steam turbines...

flizit, Excellent news!

The Subject of this thread is regarding the effect on TA from breaker opening under power, but TA is not defined in the body of the thread. TA can mean Technical Adviser, or it can mean Trip Anticipator, or it can mean something else. The torque produced by a turbine driving a generator is...

Okay, You answered some of the questions. Have you checked the thermocouples in the stack to see if the thermowells (I presume they are installed in thermowells) are clean or dirty? Temperature sensing devices installed in thermowells should have conductive gel ("grease"; fluid; etc.)...

Ali Shakarami, You should have a heat content value (LHV) for the new fuel that you can compare to the heat content of the existing fuel supply. That would be the best indication of how much more--or less--fuel flow you will need to maintain rated load. otised is right, though; you should...

msalem73, David asks MANY good questions. But perhaps the best question is: When did this problem start? It's probably a safe bet that these sensors/transmitters were working fine for some time but have recently developed problems. So, what happened right before the problems started...

smd123, Thanks for the feedback!

Mr. Gupta, You did not tell us what kind of starting means is used to purge and help accelerate the turbine; this is a very important piece of information. You also didn't tell us what fuel the turbine was being started on. And you didn't tell us what Process- and Diagnostic Alarms were...

Pierre, Have you looked in the Toolbox 'Help' function? Have you clicked on the File Menu selection to see if there's an Import or Export function? I doubt very much that there is such a capability built into Toolbox. There is a Print function, but that's probably not what you want (too...

Johnplayers, Once, again, you are welcome. Well, let's see. The primary purpose of IBH is to allow DLN-I combustor-equipped units to operate in Premix Steady-State mode below approximately 80% load. That goes for reducing load, and it also goes for increasing load. In other words, IBH...

ABDI, Hmmmm,..... Well,..... You seem to be saying that the turbine (without telling us what kind of machine it is and what kind of control system it has and if it has DLN combustors and what kind of DLN combustors it has--if any) is dual fuel-capable (natural gas and distillate, I would...

Arun, Axial compressors are very unique pieces of equipment and have their own unique operating characteristics and idiosyncrasies. I have explained it as it has been explained to me--it's to protect the axial compressor from damage when the IGVs are closed below the design minimum...