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I would say that even a high-temp plastic motor cooling fan is probably not the best for the application. Can you obtain metal fans from the motor manufacturer? Or source them from another vendor by shaft dimension and mounting method? These are probably being operated in a lead-lag...

magdy, Congratulations, and thanks for the feedback!

simon, or, Simon, I'm told GE is performing quite a lot of Mark IV turbine retrofits, and as such I would imagine they have some instructions for obtaining the Mark IV software files. They might not be up-to-date and specific to your task (as most GE instructions), but you should be able to...

It's pretty likely you have a Robertshaw Model RT-1010A. This fine manual is available for download and reading from this URL: http://www.robertshawindustrial.com/manuals/rflevel/MAN160_RT1010.pdf (remove any spaces inserted by the control.com software before pasting into your web browser)...

A decade box and an RTD table will work fine. Decade boxes aren't cheap, but they're almost indestructible. And the nicest thing about them is they work with anything. Some of the newer electronic RTD simulators will not work with multiplex devices. RTD tables can be downloaded from the...

Yes, and during acceleration increased torque results in increased speed. You are correct in that when the turbine is developing sufficient torque to accelerate the shaft without the torque assist from the starting means the jaw clutch will open. Once the teeth are disengaged because of the...

I will second this very well written reply, in that it seems you operate for some period of time at one load, and then move to a higher load. So, the wear could be "concentrated" at the lower load position. This happens quite frequently to machines operated at some load for long periods of time...

G.Rajesh, Something is causing the feedback from the GCV LVDT to be higher than the back-up FSR exhaust temperature control curve Control Constants for the conditions at your site. Why does this happen? Low gas fuel supply pressure, causing the SRV to be open fully and not maintain P2...

Hey Guy, What is the purpose of the load rejection test <b>at your site</b>? What is it that you're trying to demonstrate or prove by rejecting load from the turbine <b>at your site</b>? Is it a turbine test <b>at your site</b>? Or a compressor/compressor auxiliary/compressor...

magdy, It would be really helpful if you could be specific about the sequence of events with regard to the premature opening of the clutch during starting. Is the starting means motor being stopped or tripped before the clutch opens? Is the clutch opening before the starting motor is...

We just don't have enough information. It seems you are not experiencing icing of the IGVs, just the inlet filters; is that correct? What have you done to try to troubleshoot the problem? What were the results of the efforts? Have you spoken to the turbine OEM or packager? Have you...

I'm not quite sure I understand the question. I think you are asking why inlet filter differential pressure is monitored and used to alarm, shutdown or even trip a unit. I have seen several sites that ignored high inlet filter differential pressure alarms that resulted, initially, in low...

Thank you for the feedback. We await the outcome of the Mechanical Dept's. work. One question: Does Operations Dept. use the dot matrix alarm printer, or do they have the ability to print Alarms from files on the GE Mark V HMI? (Many GE Mark V HMIs can store up to 30 days' worth of...

I probably need to be more explicit. 20CS-1 controls the flow of hydraulic fluid to two small, solenoid-operated hydraulic cylinder (small but powerful nonetheless) that are used to close the jaw clutch halves when necessary, and ONLY at zero speed. There are springs (two of them, I believe)...

The first question to always be asked when something like this occurs is: When did this problem start? Followed immediately by: What changed at the time the problem started? Something is amiss with the calibration of the IGVs or the CPD transmitter(s), or (not likely) the MW...

G.Rajesh, TTRXS = Turbine Temperature Reference Exhaust, Secondary (FSR- or MW-biased exhaust temperature control). So, why didn't you provide the FSR of each machine while operating at Base Load? Hmmmm.... I'm guessing the units use FSR-biased exhaust temperature control as the back-up...

The explanation is already written. Remember? The teeth disengage when the starting means speed is less than the turbine-generator side) and because the turbine is not yet self-sustaining the unit trips on "bog down" ("Starring Device Bogged Down Trip") which should be one of the alarms you are...

All, This statement I find very confusing: > Mainly, I want to compute the counter-torque (when the prime mover does not react to the quantity of steam > or when the power plant is connected to the grid but there is no steam generated) and the necessary torque to > oppose to that torque...

Congratulations on finding and resolving the problem. The Mark VI interprets open and closed contacts just the same as all control systems interpret closed or open switches: current flow. When current is flowing above a certain level the switch is deemed closed, and when the current flow is...

The spreads are slightly higher on Unit 2 than unit 1. The inlet filter differential pressure is higher on Unit 2 than Unit 1. Oddly, the CPD on Unit 2 is higher than on Unit 1. This is not likely a Speedtronic-related issue (though you DID NOT include the alarms being annunciated while...