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shahabas, Synthetic oil has some very different properties than hydrocarbon-based "mineral" oil, and one of them is its ability to adhere to surfaces. The types of bearings used in aircraft derivative engines are usually roller- or ball bearings which don't need the same lubricity during...

farhankhan2019, This is a question best answered by working with GE to ensure you are maintaining the required protections for the turbine, compressor and combustion system. Especially if the turbines use DLN combustors. Really, though, whatever you do to try control or limit exhaust...

shahabas, Why do you believe it would be beneficial to change the pump driver? The engine is an aeroderivative engine--meaning that it uses the gas generator section that is typically used for powering aircraft. Do you think it would be a good idea to have a single AC motor-driven oil pump...

It's certain we don't know all the details of the situation. So about all that can be said is this: The IGVs can probably be used to increase the EGT, BUT that will likely cause the GT power output to decrease for the same fuel flow-rate.

rokan_123 NOW we're getting somewhere. Alarms DO mean something!!! FSR Temperature Reference <b>IS</b> the Back-up Exhaust Temperature Control!!! (Also known as "Secondary" Exhaust Temperature Control. Primary Exhaust Temperature Control is CPR-biased exhaust temperature control.) The...

SANJAY MALLIK, You need to look at the rung for the Starting Device Trip alarm to determine what condition might be causing the Mark IV to trip the unit. I think the signal name might be L4SMT, but if I recall correctly there is more than one signal which can cause the trip--so you need to...

rokan_123, Thanks for the feedback, but this is from your original post to this thread: >As per HRSG manufacturer guideline during cold start of the >plant we usually open diverter damper step by step starting >from 20% to 100%/ to control the HRSG HP drum metal >temperature difference...

rokan_123, I have been looking at the data you posted and I don't understand what happened to the load over the time period of the data in the file. Was it on Pre-Selected Load Control and the Pre-Selected Load Control Reference (setpoint) was changed by the operator? So far, my...

SETH, My experience is that it is a VERY good idea to install pressure gauges at various points on both the torque converter AND the hydraulic ratchet system (including a differential pressure gauge across the hydraulic ratchet filter) and record the pressures when the system is in a new and...

Chromatin, DLN combustion requires that when operating at "lower" loads (that is, lower fuel flow-rates) the air flow be reduced in order to maintain flame stability. The only way to control (reduce; limit) air flow on a GE-design heavy duty gas turbine is to use the IGVs. So, most GE-design...

I'm no HMI expert, nor MS-Excel expert, nor CIMPLICITY (PROFICY) expert. But, it's my understanding that GE ControlST and WorkstationST are OPC-capable. (I believe CIMPLICITY/PROFICY on a GE Mark VIE HMI is actually a "viewer" that gets its data via OPC.) You may be able to find some kind of...

Jeff33003300, The excitation system, sometimes called the exciter regulator, sometimes called the AVR, has upper and lower limits of excitation)usually the amount of current that can be applied to the generator rotor field windings). Too much current, called over excitation, causes excessive...

sommy_35, When you remove the feeler gauges at some point the LVDT feedback will Ge negative. This is normal and to be expected. It should only be -2% or-3%, and I believe if it is more than-5% there will be a lockout condition, which means either the gap between the actuator rod and the...

Jeff33003300, By the way, you did not mention what happened to the ST generator voltage when the tap was changed (and I'm presuming the ST and the GT are connected through the same tap changer--but that's a SWAG, and if I'm wrong, please correct me). If the ST is connected to the grid through...

Jeff33003300, Thank you for the background; it's most helpful in helping describe what's happening and why. You (and most power generator operators) don't know it, but when you are clicking on RAISE- or LOWER VOLTAGE (and the exciter is in Automatic (AC) Regulator--which it is most of the...

sommy_35, Okay, I'm confused--but, then, many would say I'm easily confused. So, Are you adding gas fuel to an existing unit that was previously running on liquid fuel(s)? Or, is the unit being relocated from some other plant/part of the world to your plant, and is now being commissioned...

rokan_123, You will need to provide (at Base Load steady state in CC mode): CPD CPDABS AFPAP CPR TTXM TTRX TTKI_[0] (Control Constant) TTKI_[1] (Control Constant) TTKI_[2] (Control Constant) TTKI_[3] (Control Constant) TTKC_[0] (Control Constant) TTKC_[1] (Control Constant)...

Sommy_35, Thank you for the feedback! Excessive heat can a sign of too little oil getting into the torque converter, or a worn torque converter. Could be tough arranging the gas valves; they're pretty heavy and bolted down. And you would have to move a lot of piping to arrange them...

STLTLS, I have begun my review of the data you provided--there was a LOT of data, including Control Constants. The grid frequency (SFL1), and therefore the turbine speed (TNH), are varying throughout the data. In my very quick review, I have seen SFL1 as high as 50.031 Hz, and as low as...

RJSolo, You have mentioned the SRV and the Secondary Gas Control Valve (which I presume is GCV2 of an independent gas control valve skid--one with three or four gas valves: an SRV (usually a rotary cam vee-ball style valve), and two or three right-angle gas control valves (GCV1, GCV2, and...