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Well now, that wasn't a very good response was it? Sorry about that. If the vacuum (negative pressure) on the L.O. Tank is too high at part load, there will usually be visible oil vapours from the outlet (discharge) of the demister. Most of the time, the de-mister's "control valve" (the...

How long has this problem been noted? Did it begin after a maintenance outage? Did it begin after someone made an adjustment to the L.O. demister setup? It's interesting that you report the smoke when you are running the turbine on natural gas at low load. Do you see the same smoke when you...

BB, Why is IGV LVDT calibration important when the IGVs are modulated to a position to control exhaust temperature? In other words, does it make any difference if the IGVs are physically at 71.3 DGA (DeGrees Angle) when the LVDT feedback (as a result of the "calibration") says the IGVs are...

These are actually differential pressure transmitters, and one of the functions they normally provide is to ensure that there is a proper pressure differential on the gas manifolds during operation. Depending on the configuration of the turbine (single fuel, dual fuel, etc.) there can be reverse...

When in parallel with other generators and their prime movers on a grid, regardless of whether the unit is at Part Load or Base Load: when grid frequency decreases, turbine speed decreases. F = (P * N) / 120 Frequency (in Hz) P = Number of poles of generator N = Speed of generator rotor...

Hello again, As was said before, or in other words, again, the information you seek about how your turbine is controlled is in the CSP for your unit. The equation for Droop- or Isochronous Speed Control is basically the same. When in Droop Speed Control, the control loop is straight...

After foreign object damage, the biggest "enemy" of combustion turbines is thermal cycling. This includes the thermal cycles experienced during normal starting and loading, loading and shutdown, and tripping. The more that can be done to start a turbine, load it to a steady load, and leave it...

Prasad, We don't know anything about the machine at your site and it's control system. Please open a new thread, and tell us about the machine, it's configuration, and the control system in use on the machine. In general, most GE-design heavy duty gas turbines with Speedtronic control...

You can find any number of PID simulators very easily using any Internet search engine, or even the 'Search' feature of control.com, omitting the ampersand. P&ID, Piping & Instrumentation Diagram. PID, Proportional/Integral/Dervivative control.

I was hoping someone else would respond to this one. Are you having some problems with these transmitters? Are you having some trouble understanding what these transmitters do in the sequencing? Because you should be able to see how these transmitters are connected on the Fuel Gas...

I forgot to include adding the cost of purchasing converters and interfaces for spare parts to the total cost of the job. It would be very helpful if third-party companies would publish the types of interfaces they would provide for bipolar electro-hydraulic servo-valves, LVDTs, turbine shaft...

<b>I KNEW IT! I KNEW YOU WERE USING TAP CHANGERS TO CONTROL VAr FLOW!</b> You deliberately withhold relevant information and ask broad questions, in multiple threads, and reply to the wrong thread. And then you smugly reply with a few more details, indicating you are patiently waiting...

Every third-party firm claims to be knowledgeable about turbine retrofits. They wouldn't be awarded contracts otherwise. And any comparison of one control system over another needs to be qualified. Is it the operator displays, the ability to access data on the user interfaces, the...

Dear Maint, you some times have a problem during loading. You didn't tell us if the compressor bleed valve opens while on line (when loaded) or fails to close when it should during starting. You also didn't tell us what you do to resolve the problem, which could be helpful in understanding...

Maint, Maint, Maint, Your posts tend to be short and one line, regardless of the thread. You provide very little in the way of information with which to provide a quick and concise response. As much as a Frame 6 is a Frame 6 (turbine-wise), the options and auxiliaries and packaging and...

I am just becoming familiar with the effects of varying Wobbe indices on turbine operation and don't have a lot of experience with it to date. But, I have to say from the importance placed on it by GE and other combustion turbine manufacturers it would seem that the operation you describe can...

Better day, For starters, I wouldn't necessarily consider a 600 MW power plant small. There's way too much about your plant, and it's relation to and position on the grid in your part of the world, that we don't know to be able to make a comment about the effects of VArs (leading or...

It has been told in previous threads that some early Mark V systems used this very simple relationship for calculating Droop Speed Control FSR. Most Mark V control systems use another method for calculating Droop Speed Control FSR, and that method is generally called 'Constant Settable Droop...

Our definitions of flame out detection have to be radically different. To me, flame out detection means a determination that flame has been lost in a running turbine and that's typically done with a some kind of flame detector failing to see flame when it should be seeing flame. My definition...

How can you say that your problems are the same as sd's? He said his unit has no problems maintaining slow roll; his unit just can't break the turbine away from zero speed. Your unit, on the other hand, has no problem breaking the unit away from zero speed. But, your unit won't maintain slow...