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This question caused me to think a little harder than normal. Combustion requires the fuel and air (oxygen) to be in a particular range. In a natural gas pipeline/supply, there is no air (should be no air) and so it's "safe" from the risk of ignition--until it's allowed to mix with air and be...

"Turndown" is a term which has been derived from 'turndown ratio' which is a fairly common term used when describing characteristics of many flow-rate measuring devices. In this usage, turndown generally refers to the operating range of the combustion turbine in low emissions mode (by low...

I forgot to include some possible important pieces of information about the ignitors (spark plugs). Most GE-design heavy duty gas turbines with conventional combustors have a single ignition transformer with two outputs (some a two ignition transformers each with a single output). There is...

I know I'm going to be made to regret this, but here goes another overly long explanation anyway. I don't believe Ayed would have asked this question if he didn't want to know all about the spark plugs used in GE-design heavy duty gas turbines--not just how the spark is generated. While...

Well, I hadn't considered this possibility. One would hope the originator would be able to tell if the cranking motor was being powered by its AC supply or not.... Most of these Frame 9E electric starting motors are directly coupled to the input shaft of the torque converter; that is, no jaw...

Most of the hydrogen-cooled generators I have worked on have had "flow-rators" or some other such means for setting the scavenging flow-rates. While these may not be the most accurate indicators, compared with total usage (if being fed through bottles or six-packs, etc.) they should be a good...

A. Oztas, Are you saying that on these units the HP speed is constant over the operating range of the LP, and that the second stage nozzles can keep the HP speed constant over the operating range of the LP? If so, that would mean that we really need to know if the actual P2 pressure is...

What makes you say this is a problem? Are you saying the unit has IGV Exhaust Temperature Control Mode, and that it is selected and enabled and that the exhaust temperature is lower than it has been in the past? Or, are you saying that the unit has IGV Exhaust Temperature Control Mode, and...

If the post is understood correctly, the unit is a GE-design heavy duty Frame 9 gas turbine, with DLN-2 combustors, with a continuously running cranking motor while the unit is running. (But the post isn't really clear.) There are Frame 9<b>Es</b> and Frame 9<b>Fs</b> (and FAs and FBs). Most...

soheil, No; this is not sufficient information. We asked if the P2 pressure was constant and if it was equal to the P2 pressure reference. The typical signal names for P2 pressure and P2 pressure reference are FPG2 and FPRG, though they may differ slightly depending on packager's preferences...

>all [liquid] fuel fired gas turbines have a >manual purge valves . ProcessValue, that's not true. It's only true for units which have liquid fuels which may need to be purged if the unit trips while operating on that fuel and can't be quickly re-started, or units that can't be started on...

Well, this is very unusual. Again, it's even more unusual because the two cans that aren't lighting are the two cans with flame detectors (or at least it seems that way). That's a very strange coincidence, but stranger things have happened. In my estimation, the problem is most likely...

You heard correctly. Many of the early GE-design heavy duty gas turbines had IGVs that were either open or closed; there was no intermediate or modulated position. (They were affectionately referred to as "bang-bang" IGVs.) The IGVs were (and are) usually kept closed during starting and shutdown...

When did this problem begin? After a maintenance outage? A combustion inspection or hot gas path inspection or major inspection? Is the liquid fuel supply pressure (upstream of the stop valve) stable and within specification (usually about 4.0 to 4.5 barg)? This should be stable during...

There are so many things wrong with this reply. First, the originator did not say if the feedback matched the actual position. It appears he is just comparing feedback to reference without knowing if the feedback is even close to the actual physical position. Second, it has been assumed...

No. Inputs and outputs terminate on <CD> (<C>'s discrete I/O core), <C>, <R>, <S>, <T>, <P>, and <QDn> (<R>, <S>, and <T>'s discrete I/O core; "n" could be 1 or 2 depending on the number of <Q> discrete I/O cores; <Q> is a collective reference to <R>, <S> and <T> in a TMR panel). It's...

As Bob Johnston has said, A8 is a pretty serious failure/indication. I was just trying to make sure that all the jumpers are in the right place, the cables are properly oriented and connected, and that the StageLink- and Voter IDs are all set correctly. This is basically the easy stuff, but it's...

The Mark IV is a fine system, like all control systems it has it's idiosyncrasies. But, if you want to interface it to other systems, your options are pretty limited. That's just a fact of life. And those options can be pretty expensive considering, as you have noted, it is time for an upgrade...

Iqbal, Trying and not succeeding does not bode well for an engineering organization; especially on products that are successfully configured and used every day around the world. I believe the problem with the printer truncating messages is that the default font was never changed to one...

What does the SLCC display show as the Voter ID for <C>? If it says B instead of C, then the SDCC card hasn't told it's in <C>. See the following thread: http://control.com/thread/1296512618 If the Voter ID wasn't set, it's a safe bet that the the StageLink ID wasn't set, either. You'll...