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Are the flame detectors new (different) models, or just new detectors of the same model previously used? Is there something you are doing differently when testing them? Is the tester new or different? is the person performing the test new at the testing?

Mr. Lee, Are you referring to the actuator on the IGVs for the gas turbine axial compressor IGVs? Or the IGVs on the driven compressor (the one driven by the gas turbine’s LP shaft)? GE typically uses a hydraulic actuator and electro-hydraulic servo valve to position the gas turbine axial...

Curious _One, The two-shaft machine drives some kind of compressor—probably a centrifugal one. But I do agree—the site dodged a bullet they might not avoid next time. If it can’t be forced, re-calibrate it and if that doesn’t work, well, replace the servo. Oh, and downloading and rebooting is...

I'm struggling to understand what FSRMIN has to do with not reaching 14HS. I'm also struggling to understand the safety implications of forcing 14HS below 95% speed.... It doesn't seem wise. Is it possible the second-stage nozzles are not operating correctly--or that the LP load is excessive???

nikidi.control, Too many. Looking forward to retirement. Sooner rather than later.

skyimk, I also want to mention that many STG's used in combined cycle applications operate differently than most other STG's--because they are "captive" to the CTG's and their loads and exhaust heat. Many STG's used in combined cycle applications just open their control valves wide open after...

In my experience, the length of the pulses used to change speed reference (and therefore load) are one of the most important things to be “tuned.” All grids have machines synchronized to them and while many have the same percentage droop regulation setpoint and different load capabilities...

makarand, I cannot, and will not, make any recommendations without more fully understanding the configuration. As the owner or operator’s representative you can make informed choices and modifications based on your knowledge and experience. Please write back to let us know how how you fare in...

Have you tried IC Spares (ic-spares.com)? Or Gas Turbine Controls (callgtc.com)? Those are two of the best of the group of direct third-party suppliers.

makarand, You didn’t attach the MS-Excel file. You didn’t say when this problem started (such as after a maintenance outage). You didn’t say how long it has been since the last maintenance outage. The internal cooling passages of GE-design heavy duty gas turbines are not as simple as...

skyimk, Hundreds of turbine-generators of all sizes and types are synchronized together on islanded grids in many locations around the world every day. How? Because they are adhering to basic AC (Alternating Current) fundamentals for synchronous generators. You would need to tell us quite a...

No. I don’t do private messages. The beauty of Workd Wide Web forums is that many people can see the questions and answers and benefit from the exchange. Using private messages, only one person benefits. And I would answer the same questions repeatedly. Here on Control.com every thread is...

Ngassaki, Please open a separate thread forthis unrelated question. Here's how to open a new thread: Open a control.com page with the URL at the top of the snippet; then click on the 'Post New Thread' target on the right side of the page header.

The speed sensor doesn't have teeth. The speed sensor is usually a magnetic pick-up of some type (active (powered) or passive (unpowered)) that senses changes in magnetic density--such as occusr when a piece of metal passes by the speed sensor followed by a lack of metal. This creates pulses...

WTH???!!!?!?!!! Are you expecting to control load to some setpoint during frequency excursions? What do you expect Secondary Frequency Regulation to do? What do you expect Secondary Frequency Regulation to do when Primary Frequency Regulation is active? USUALLY, an ML (or MLI) has something...

hussainify598, Please open a new thread for this unrelated question (unrelated to this thread's topic). It would also be very helpful if you would be more specific about the parts you wish to purchase--for example, spark plugs, or pressure transmitters, or fuel nozzles, or combustion liners...

While similar, centrifugal compressors have different operating characteristics than axial compressors, though some of the same terms are used for both (such as the infamous surge and stall). I think that multi-stage centrifugal compressors are more susceptible to surging and/or stalling.

Science20, Pray tell: What sparks your need to understand axial compressor stall/surge?

I didn’t forget/haven’t forgotten. Since you can’t check specific gravity, if the group were to fail the run-down test the you would have to separate the batteries and measure the individual voltages and maybe run an individual load test of some sort to see how long it takes to reach the lowest...

lo-47, Thanks for the information! SIMPLEX does not have any redundancy. Is the turbine a gasser or a steamer? SEU, huh? I’m going to add that TLA (Three-Letter Acronym) to my repertoire. Might prove handy one of these days. (As is said, “If you can’t dazzle them with brilliance, baffle them...