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DAMENE AMAR, Lots of simple questions.... Was the same metering valve used on all three turbines? Or, at least the same type of metering valve (not necessarily the same size) from the same manufacturer used on all three turbines? Do these have electric actuators, or hydraulic actuators...

apv, The Mark VI System Guide, GEH-6421, has a section on Installation which talks about proper grounding (earthing). The Mark VI (and Mark VIe, as well) is designed to have two grounds: one call "protective" earth, and one called "functional" earth. This is explained in the System...

Again, I'm presuming the turbine has a combined SRV/GCV assembly (two valves in a single casting). There is supposed to be a gap between the actuator rod and the valve stem, of approximately 0.030-0.050 inches, which, when the LVDT is properly calibrated, <b>WILL RESULT</b> in a slight negative...

engr, I've been doing some research regarding load tap changers, or on-load tap changers. It seems that different manufacturers make different types of transformers/taps depending on the application. It's really difficult to say what should be done at your site without understanding more...

ABDI, You could certainly try. Troubleshooting with a swirl angle chart is always iffy at best. It's just a tool for estimating which combustor(s) might be experiencing a fuel flow problem or a combustion hardware problem--it's not an exact tool. If you're only having the spread problem...

Reeny, You haven't provided enough information about the type of instrumentation and controls. Are you referring to the engine instrumentation and controls, or to the plant-wide instrumentation and controls? Water treatment; fuel handling; switchyard; lighting; etc? Again, the engine...

The problem will not be solved with TSM. If you have a combined SRV/GCV assembly, the problem is detailed in this thread: http://control.com/thread/1294809227#1295331639 The SRV and GCV are virtually the same as far as operation and construction. The valve stem does indeed go below 0%...

You can write just about any specification you want. But the deciding factor will be the choice of the control system integrator (we presume you are talking about the plant-wide control system, not the individual engine control systems that will likely be provided by the engine manufacturer or...

Phil Corso, Were it not for education I would not be where I am today. It's just that some academics forget what it's like to have to learn a concept--which is much more than maths. People operating and maintaining equipment would certainly be better off if they understood all of the maths...

Brian, My experience may be a little dated (I haven't seen a Mark VIe installation for over a year), but here's what I knew back then. The Mark VIe turbine control panel has MODBUS modules that allow a third-party control system to communicate via MODBUS <i>directly</i> to the Mark...

saudiguy, Is the tap for the jacking oil pump suction ahead of or after the L.O. Bearing Header Pressure Regulating Valve? Is the lube oil at Aux. Pump discharge pressure or bearing header pressure? I have seen it done both ways--before and after the bearing header pressure regulator. Some...

Daneezy, The answer to your question is clearly shown on the P&ID for the oil system that the jacking oil pump is shown; it's not the same for every turbine, and we don't know what kind of turbine you are referring to. Just that it has a jacking oil pump motor (88QB is the motor for the...

JFB, No worries. It is reasonable to expect that people can use their preferred Internet search engine to find converter applications and lots of other related information. But, what seems to happen is that when the first search they perform doesn't turn up the exact result they were looking...

iii, Okay. I'm confused. Why can't you just tell us what the gas fuel supply pressure is (specifically--not just that it's always above 19 bar). The pressure drop you cited across the SRV is very typical of a working SRV, but I don't know how you're measuring it with the typical...

Abhishek, It's been a very long time since I've seen or used this formula (and it may not have been this exact formula). But, I was just trying to get JFB to comment on what 'frequency' is--or might be--in the formula he provided. In formulae I've used in the distant past, it was always...

Daneezy, Since jacking (or "lift") oil is pumped into the bearing where lubricating oil is also being pumped, it comes from the Lube Oil system. Please review the L.O. P&ID for the turbine at your site for details.

JFB, Thanks!

leon, It would seem the GAS turbine at your site is a two-shaft machine, which doesn't change the P2 pressure control but it is kind of nice to know. When you say it tripped on inter-valve pressure--high pressure or low pressure? What is the gas fuel supply pressure upstream of the SRV...

I think we need to remember the original poster has a much larger problem on his hands: Why is the pressure drop across the SRV so small at rated speed? I doubt the original poster will replace the SRV, but he should definitely be very concerned about the low pressure drop and be working to...

DAMENE AMAR, Long time no hear from you; welcome back. Basically, to accomplish what you want to accomplish requires something like an equal percentage trim valve, or something very similar. I guess another name for an equal percentage trim valve might be "metering valve". Back when GE was...