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I am not really a steam turbine expert. While I have some knowledge about how the steam turbine works, my expertise was more on the HRSG and BOP controls and about how the overall combined cycle plant control systems work together to operate the power plant. I retired from GE nearly 8 years ago...

LIT = Level Indicating Transmitter > Finally, I have no idea what a LIT signal is, or why you believe it to be 4-20mA.

Some general comments/questions on this thread: 1. If this is a MS5002B with Mark VIe control, I strongly suspect the Mark VIe is a replacement control. The original control was likely a Mark II control or possibly a Mark IV. Is the Mark VIe simplex or triple redundant? 2. The IGV's may be...

>When the junction >experiences a change in temperature, a voltage is created. This statement is not quite correct. The junction will produce a voltage proportional to the temperature of the junction. The temperature does not have to change to produce the voltage. For example, a Type K...

CSA, I would expect the diverter damper to be located right before the inlet duct to the HRSG. With the damper pivoting from the top so the damper is swung upwards against the exhaust flow to open the gas path to the HRSG and close the path to the bypass stack which is on top. This probably...

At the time I retired, temperature matching on FA & FB GE gas turbines with no dampers involved a 2-step process: First, with a cold HRSG, limit the GT exhaust temperature to whatever the HRSG vendor specified for initial warmup. Second, raise the exhaust temperature to 100 degrees F above...

Saul, First, all of my experience with steam blows is from combined cycle plants, not straight steam plants. However, the purpose of the steam blows is to clean all of the construction "junk" in the steam lines prior to admitting any steam to the steam turbine. The type of generator coupled...

The turbine rotor and the turbine casing expand together as the gas turbine heats up. Study how the turbine supports are connected to the base. I believe you will find it is firmly anchored at 1 point and free to slide at other support points. I don't have access to any of the drawings, and it...

For SOE signals, the time stamps come from the controller, not the HMI. This is done to achieve the 1 millisecond resolution. Note, if you have Mark VIe, the time stamps may be done at the I/O module (I don't remember). There are means to synchronize the controllers to an HMI, although it may...

One consideration that hasn't been mentioned in this chain is measurement time lag. This would not impact bearing temperature or motor winding temperature monitoring, but if the measured temperature is used for control purposes, a small lag is frequently required. In this service, thermocouples...

The MK I backsheets include detailed circuit diagrams of the SPEEDTRONIC analog control cards. They are (or at least were when I worked for GE) considered proprietary information, and as such were not available to non-GE employees. The elementary diagrams provided with the equipment showed...

George, Hagan Controls was indeed owned by Westinghouse, and was taken over by Siemens when they purchased Westinghouse. So, you might try your luck with Siemens. But I think you may also need to consider replacing the control valve in case you can't get the necessary parts. You didn't say...

Paul, Velocity is what it says - the speed of the gas stream in the pipe or duct that it is flowing in. Think of it like wind speed. To convert velocity to ACFM all you need to know is the area of the pipe or duct. The density of the gas doesn't matter. If the velocity is 100 ft/min and the...

"SCFM" is really a mass flow measurement. A Standard cubic foot of gas is the amount of that gas at 14.696 psia and 60 degF conditions. "ACFM" is the volume of gas flowing at the actual pressure and temperature conditions inside the pipe containing the gas. A gas velocity measurement (or...

In general, using crude oil as a fuel in a gas turbine will require a fuel treatment system. What is included in the treatment system is specific to the actual crude oil being used. Most crude oils contain impurities that must be removed and/or chemically changed in order to maintain a...

Haroon, You stated that maintenance had been performed on the gas turbine immediately prior to this problem. Was anything done to lock the LP shaft during this maintenance? (Doing so might permit fired testing of the gas turbine while maintenance on the load compressor was still being...

Askic, The GE Mark VIe control system has been supplied as a plant level control for GE combined cycle power plants (including HRSG and BOP) at least since 2008. Up front warning here: I may not be completely unbiased on this subject, since I am a retiree of GE (since late 2009). I personally...

CSA - you are probably correct that the N-TRON IONET switches for the gas turbine are powered by 125 VDC, although I am not sure that is the case on combined cycle projects for the HRSG and BOP equipment. I don't recall running 125 VDC power out to those locations on any of the combined cycle...

If you remove the 110VAC UPS the turbine will trip. The UPS powers the Ethernet network switches for the UDH/PDH and the IONET, along with the HMI's. The spark plug is not needed once the turbine is running. What you will need to do to replace the UPS with the turbine running: 1. Get out...

> 2-No P&ID is available for ventilation system of this GT. Note: GE calls their gas turbine P&ID's "Piping Schematics" If you have the Device Summary (also known as the 0414 drawing), it should list all the Piping Schematics.