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Perhaps otised can help with decoding the designation, but a 9171E basically denotes a single-shaft Frame 9, "model" E heavy duty gas turbine. I have heard of early Frame 9s with actual turning gears (electric motor-driven gear mechanisms) used for cooldown operation, and I've even heard of a...

I have never seen a damper that was <b>closed</b> by CO2 pressure. Some dampers are manually latched open and the latch is released when CO2 pressurizes the line on discharge. And gravity then closes the damper. Other dampers are opened by air flow, and when the fans shut down gravity closes...

What problem are you trying solve by adding additional instrumentation and possibly sequencing (alarms? interlocks?) to the turbine control system? Is there some requirement by the insurance company or local fire agency to have indication that the gravity operated dampers closed when a fire...

Bob Johnston makes an excellent point: Have you looked at the six green "dots" on the Synchronizing Display to determine what permissive or permissives is/are not met? Any "dot" that is red (the "dot" will change from red to green when the permissive is met). But, again, when did this problem...

When did this problem start? When you say "... it times out ..." do you mean that the 'Failure to Synhcronize' alarm is annunciated? Does the Automatic Synhcronization actually abort when the alarm is annunciated? Because if it does, then the sequencing is not standard; that alarm just means...

Most synchronous generators and AVRs (exciter regulators; excitation systems) are rated for a specific voltage, plus-or-minus 5%. Perhaps Mr. Corso could tell us what kind of efficiency improvement could be achieved by running an alternator at approximately 5% higher than rated? Is it a...

This is very interesting; because GE doesn't sell Mark V Speedtronic control systems any longer. There is a rumour floating around that GE sold the Mark V technology to one of their Business Associates in Asia, and perhaps you are purchasing it from that source? At any rate, many people...

What does GE recommend for a commissioning procedure? When commissioning any machine of this size it's necessary to prove ("loop-check") all of the inputs to- and outputs from the control system to make sure they are all working properly and providing the proper signals at the proper times...

Which false start drain is the heavy fuel oil coming out of? From the lower combustion cans? From the exhaust plenum? From the combustion wrapper? Have you consulted the Piping Schematic drawings (P&IDs) to understand how heavy fuel might be getting into the false start drain?

mogy, What does GE say about this? And why would the type of Speedtronic panel make a difference with the LVDT feedback? As you know, most of the LVDTs used on GE-design heavy duty gas turbines are to be set for a zero-stroke voltage of 0.700 VAC RMS and the range of travel should not...

There is something that we're not being told about this turbine and it's inlet configuration or you've a very special machine on your hands. Because, the Ideal Gas Law states that any time there is a pressure drop for a fluid that is flowing (and air is considered a fluid) that there will be a...

Silk, This is one of "those" questions that has been asked and answered many times before on control.com. In the far right corner of the menu bar at the top of each control.com page there is a 'Search' field and a 'Search Help' button. The Search function here is very good and very fast, but...

This is an excellent question for the manufacturer of the generators (presuming they are made by the same manufacturer). If I recall correctly, the air gap between the rotor and the stator is pretty critical, but that recollection is from a university course on rotating machinery more than 30...

Probably not, but, if you've got time and the inclination, give it a try. But you'd be on your own if it didn't work. I've never seen a 64-bit version of MS-WinXP Pro supplied on a GE Mark V HMI. But, then I've not seen every GE Mark V HMI ever produced (thankfully; I've seen to many of them...

I've seen this happen twice in as many weeks to the same Frame 6B turbine many years ago just after a maintenance outage; the Nylint coupling between the Main Hyd. Pump and the Acc. Gear driving shaft would break. The first time it was verified that the Hydraulic pressure was correct after the...

You haven't answered all of the questions, and if you're playing with SPY and changing voter IDs, you're on your own. I didn't ask what kind of Mark V you were working on, I asked what kind of turbine the Mark V was being used to control. In your original post you indicated the Mark V was a DCS...

mua, I've heard of rotor blocking before, but not in this context; usually it refers to work done to the generator rotor during maintenance or repair. If by "blocking" you mean that the engine-generator is unable to be loaded above approximately 7 MW, then I feel pretty confident in saying...

And, the most important question was neglected: <b>When did this problem start?</b> It seems to have started after some Control Constant changes were made. And, we have to ask: 1) Why were the Control Constant changes deemed necessary? 2) What Control Constants were changed? 3)...

From your description it would appear that the units are using IGV Exhaust Temperature Control at Part Load. I would also presume that Pre-Selected Load Control is also being used to maintain a load setpoint during operation. The interesting thing is that you didn't mention what the fuel...

I've seen something similar happen many times before, when some signal provided from a control system belonging to the "Customer" doesn't change state when it should, or changes state when it shouldn't, or isn't the right sense (NC or NO) to begin with. Please write back to let us know how...