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Is it always the same pump which experiences the drop in pressure? Have you checked the pump? Does the pump have a pressure compensator? Could it be failing? Have you checked the pump to motor coupling? When this problem occurs is there a large change in multiple valve positions? The...

I experienced a very similar occurrence just a couple of months ago. A Mark VIe with UCSB processors that had been shut down for several months was re-started and <S> and <T> came back up just fine, but <R> had lost all of it's "memory" and had to have the firmware and application code...

I agree with glenmorangie; air had gotten into your liquid fuel system at some point(s). If you changed fuel filters but didn't purge the air out of the filter vessels, that could be one area. You said you changed the liquid fuel check valves; certainly some air would have made it's way into the...

Wada, This isn't really a controls related issue, but since you've asked the same question twice here are a few things to consider: -fuel consumption per kw -length of time between maintenance outages -duration of maintenance outages -cost of spare parts -cost of consumables (oil...

The ActivePoint HMIs are, in my personal opinion, a step up from the previous HMIs--but that's purely a subjective opinion. I haven't used one yet, but I kind of like the grey-scale screens as I feel the others were poorly designed and animated and without the ability to hover over data values...

etoilesh, I want to add a couple of things about LVDTs. There are highly reliable devices. They have no moving parts (yes; the core moves in and out of the armature along with the valve stem or device being monitored). They have no friction--when installed and maintained correctly. They don't...

Mohammed zaki, Unfortunately, the answer to your question is not simple. And it's made even more complicated by the unit you work on. GE-design F-class turbines can be configured in MANY different ways, AND they can also exhaust into MANY different types of HRSGs (Heat Recovery Steam...

etoilesh, It would be easier if you told us what problem(s) you are experiencing, and what troubleshooting you have done to try to resolve the problem(s), and what the results of your troubleshooting were. Using Telnet and TSM (for Mark VI; llm (Low Level Monitor) for Mark VIe) are best...

Dfoster, You understand me exactly 100% correctly. Of course, if several exhaust T/C bargraphs exceed the alarm or trip setpoints the 'Exhaust Temperature Average Excluding Outliers' would be elevated and cause an alarm or trip--but just because one or two bargraphs turn yellow or red does...

>during valve opening malfunction, the pressure transmitter >value before IBH is (-ve). I'm not quite clear what the above statement means. If you're saying the reference to the I/P positioner on the IBH Control Valve from the Mark VIe is telling the positioner to close the valve but the...

>1. how does circulating current reduce on placing the >welding ground nearer to the place of welding? If the welder ground lead is not placed close to the place where the welding is to be done the current between the welding rod "stinger" and the welder ground will have to travel the...

So, as has been proven and said many times in the past, I'm NOT the best proof-reader of my own writing. <b>>>CORRECTON<<</b> One, or six, or sixteen or sixty synchronous generators synchronized to a 50 Hz grid with other generators can run at 51.2 Hz, or 49.6 Hz. The above sentence...

>Why MARK 6 supply is made off during any hot (welding, >grinding) job in gas turbine? Is it related to possibilities >of ground faults in Mark 6? There are people who will weld or grind on or around a turbine being controlled by a GE Mark* turbine control system that will not always take...

How old is the unit What kind of cooldown scheme does the unit uses? Slowroll (which uses the torque converter to maintain 30-50 RPM? Turning gear? Hydraulic ratchet? Does the unit have Bearing Lift Oil (sometimes called 'jacking oil)? (Bearing Lift Oil will usually only be necessary for...

The thing about AC power generation is that when two or more (or two hundred or two thousand or more) synchronous generators are <b><i>synchronized</b></i> together on a grid no generator can spin faster or slower than any other generator based on the construction of the generator. There's this...

wafa, Shipboard genset, eh? This response is to your question--a single shipboard genset (you didn't mention anything about multiple gensets operating in parallel!). The governor of the genset prime mover should be operating in Isochronous Speed Control. Isochronous speed control will...

In general, if there is poor airflow and/or hot air leaks, then yes. The direction of airflow (into or out of the vent fans) doesn't matter.

Based on the (minimal) information provided, it's impossible to make even an educated guess about what the cause might have need. The previous replies to this thread and many other similar threads on control.com contain a lot of possible causes, but because you have chosen not to share any...

No.

This is a really poorly formed question. 1198 deg C is equivalent to> approximately 2188 deg F, and that's probably very close to the rates during temperature of the turbine in question. Meaning that's a relatively high firing temperature. Further, you haven't told if the combustion mode...