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rokan_123, > Consideration of Wheelspace temperature on the running of Turbine compartment vent > fan is that when wheelspace temp is high/higher side then there is a possibility of > forming vapor of Lube oil & liquid fuel oil if there any leakage due to heat > radiation from Turbine hot...

There is a lot of industrial equipment sold/auctioned on eBay, new, used, refurbished, salvaged, overstock, etc. There are other industrial auction sites on the World Wide Web, also.

Hello, > 1- Why does the gen trip on bus overvoltage? Exactly what happens immediately prior to the bus overvoltage trip? Is some load (resistive; capacitive; inductive) being switched on or off when this is occurring? What happens to the other generator's voltage when one generator...

laklmap, 1. Yes. 2. Yes. > 3. Phase angle is matched by momentarily applying a load to get the signals in-phase No. The only way to "apply a load" is to close the generator breaker. When there's no current flowing in the generator stator windings there is no magnetic field--but by...

>:) Yes exactly Then I believe that same manual "control valve" should be used to control speed during synchronization, as it's probably also used to accelerate the turbine to synchronous speed. If that's the only means of controlling speed when the generator breaker is open and the only...

Max, The usual practice I've always tried to follow separated signals based on their voltage and/or current levels. "Low level" was considered to be anything like 4-20 mA; 24 VDC; 0-50 mA; 10 VDC; 48 VDC; thermocouple (millivolts); RTD (low DC voltage/current). Most low level signals were run...

ibrahimdowa, What does the Liquid Fuel P&ID show? I don't recall if there's a packing leak-off drain line from the liquid fuel stop valve, but even if there is--it should NOT be routed to the L.O. Tank. And, the Liquid Fuel Stop Valve (on most "newer" GE-design Frame 5 heavy duty gas...

Is the manual valve used to control the power produced by the turbine-generator after the generator breaker is synchronized to the grid?

Is the generator a synchronous generator or an asynchronous (induction) generator? Does the hydro turbine have a governor (control system) to operate a variable control valve (wicket)?

And this conversation was about bleed valves, not variable bleed valves. And bleed valves on GE-design heavy duty gas turbines in particular.

hany5757, When did this problem start? Has it been occurring since commissioning? Has something in the way the consumer operates their plant/process changed recently which has caused this issue to appear? What kind of actuator does the control valve have (high- or low-pressure...

FrankKant, >My thinking was that it would be best if all >the compressor air was going through the turbine and or HRSG >purging rather than out the bleed valves. Not bad thinking, but the compressor bleed valves "exhaust" in the GT exhaust, so it goes into the HRSG, just probably at a...

dontknowman, Didn't anyone ever tell you you shouldn't believe everything you hear? The most common type of flame "sensor" (detector) used in early Speedtronic turbine control systems, from Mark I through Mark IV and into the early production of the Mark V were Geiger-Muller-type Ultraviolet...

FrankKant, > I would also add you want to keep them closed during a purge. What's your definition of purging? When does it occur?

Need more information about the turbine you are referring to. Different manufacturers have different schemes and to properly reply to your query you need to tell us what turbine you are referring to. Also, if you're referring to GE-design heavy duty gas turbines there are several good answers...

ibrahimdowa, Typically there aren't any liquid fuel lines running through the L.O. Tank--just to prevent this kind of problem (contaminating the L.O. with liquid fuel). So, it should be possible to follow all liquid fuel lines outside of the tank and see that none enter/exit the tank...

Gleb/Stroganov, First, I would agree and implied that changing Control Constants without GE's concurrence is not a good idea--not for DLN-I combustion systems. Second, you had asked about whether high CO would be indicative of primary zone re-ignition while in Premix Combustion Mode. It...

amine_nacer, Before you do anything--<b>MAKE A BACKUP OF EVERYTHING IN THE UNIT-SPECIFIC DIRECTORY!!!</b> You have to manually edit SITE.ASG using the convention dictated. You will have to choose names for the second column as you're creating the signals from spares (?VQCC is the mnemonic...

Hello, Have you consulted the Mark V Maintenance Manual (GEH-5980) and the Mark V Application Manual (GEH-6195) to see examples of sequencing modifications, and of how blocks are to be programmed? It always helps when doing something like this for the first time if you can find an existing...

Gleb/Stroganov, I suspect your site is one of many which operate using Pre-Selected Load Control, and that your operators are selecting a load which is "dangerously" close to the transfer point from Premix to Lean-Lean, and when the unit does go to Lean-Lean the load/TTRF is such that it...