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jack, You're on the right track. Generators are devices for converting torque into amperes (and electric motors are devices for converting amperes back into torque!). Vary the torque produced by the prime mover driving the generator (a turbine or a reciprocating engine) and the amperes...

rkysati, glenmoranjie's 1000% right--the real problem is why is the L.O. Header temp so high? The trip setpoint is a function of L.O. vapour flashpoint temperature which is also affected by the expected pressures in the bearing cavities. A fire or explosion can result if the L.O. vapours...

VKGUPTA, I've been thinking and thinking and thinking about this. I think, there's too much we don't know about the equipment being used at the site. I think there is naturally a large inductive kick when the DC contactor of the ELOP motor starter opens. I think the inductive kick causes...

sggoat, > I resisted all mods to this, as the leaking actually blew liquid fuel back out of the combustors, > and valves keeping them clean for the next fuel swap from gas to liquid. I'm confused. There should be a liquid fuel purge system that purges the "nozzles" downstream of the...

Malik787, Without being able to see the relay ladder diagram or function block diagram representation of what you are attempting to describe I can't comment. To my personal way of thinking, cycling turbine compartment vent fans based on wheelspace temperatures is, ..., well, ..., er, ...

RenegadeGas, All I'm saying is, while this is a good time to be getting into gas turbine controls (there are a lot of experienced people retiring and with the availability of inexpensive natural gas increasing), there are disruptive technologies on the very near horizon. In general, the use...

Hello, There have been lots of technological advances in systems and components over the last twenty-plus years. I don't recall the publication number but the OEM has published, and revised, a document that describes their recommendations for F-class dual-fuel machines. They sell a number of...

ITT, What do you mean by "advanced/automatic grid control functions"? The big difference between simple- and combined cycle power plants is that the steam turbine load is a function of the gas turbine load. For example, if the steam turbine is rated for 100 MW, and each of the two gas...

muz_sidhu, Based on the exhaust temperature data, it's pretty clear that something is restricting the flow of liquid fuel to the turbine. What's not clear is whether it is something in the liquid fuel supply line to the turbine, or a problem with the high-pressure liquid fuel pump, or the...

VKGUPTA, Was the Mark VIe provided with a new GE-design Frame 5 heavy duty gas turbine, or was it an upgradation from an older turbine control system? How long has this problem been occurring? Since commissioning of the Mark VIe? Has it just start recently? You post is unclear. A DACA...

There really is no change-out period or recommendation. You need to provide information about the failure mode--are they failing open circuit? Are they burning? Are they failing because the tips are rubbing/chafing on the radiation shield? Is the wiring insulation getting burned or...

GTENG, Thanks for the feedback!

GTENG, Thanks for the feedback!

RenegadeGas, You definitely need to have a very good understanding of y=mx+b, also written as (f)x=mx+b--which is the equation for a straight line. It's very commonly used throughout process industries and the power generation business. It's also useful to have a very good understanding of...

sggoat, If the unit is running the air and hydrogen will be very well mixed as the axial fans on the generator rotor circulate the hydrogen and air. If the purity is low, the solution is not to "vent" but to increase scavenging until the purity increases. One should not wait until the purity...

streetglide, It seems you are using two terms interchangeably: venting, and purging. I guess I could see where you could use the word "venting" for the process of flowing hydrogen out of the generator casing during purging, but you seem to be making a distinction of some kind which isn't...

Murali, If these machines are old(er) they might not have modulated IGV control. That was very common for early Frame 6s, especially ones that were only originally expected to be operated in peaking application (simple cycle mode) OR which were originally planned to be operated at Base Load...

If you've followed the instructions in the manual, then you have calculated correctly. I see you've learned the "dirty little secret" about HFO (Heavy Fuel Oil; "bunker"; residual fuel oil; etc.). It might be cheaper from a fuel price perspective, but it's not very good for the turbine and...

Renegade_Gas, > Do Turbine controls engineers earn more than mechanics considering the pressures? That's amusing! <b>NO!!!</b> The pay is generally about the same for mechanical and controls field engineers, and they both generally earn overtime because it's the nature of the work that it...

Esoteric_stone, The TCDA and TCEA cards are connected to the TCQC via the IONET cable. The IOMA (I/O Master) isn't really a "card"; it's a chip on the DCC card. It could, indeed be that the TCQC card is experiencing problems, or that there is some problem with the IONET cable running from...