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LQ1, I really can't see much in the photo; and there's only one photo that I see. Are these panels installed in the hot gas path designed to muffle exhaust sounds, or are they pieces of the insulated side walls of the duct work which have come loose? Were the exhaust components provided by GE...

MBA, Most sites with DLN combustors have an emissions monitoring system (often called a CEMS--Continuous Emissions Monitoring System) which is used to ensure that emissions do not exceed guarantee (which can often result in civil and/or criminal penalties, including jail time in some parts of...

ControlEng999, A lot of posters and contributors here on Control.com do not speak English as their primary language. We mostly get along just fine, but there is the occasional incident where, mixed with cultural differences, the discussion can go sideways. We have reached that point in this...

stevesummers, Speed control can take a couple of forms: Isochronous or Droop. In AC (Alternating Current) power systems the frequency of the system is directly related to the speed of the generator—which is a function of the speed of the prime mover driving the generator. The prime mover might...

ControlEng999, " ... but of course they were close to allowable spreads ...." What does that mean, please? What do we not know about this unit? Is there something special/unusual about the combustion system? The fuel delivery system? Why would one expect actual exhaust temperature spreads to...

ControlEng999, I've been looking over the values in the screenshots you sent; there are several which just don't pass the sniff test.... A_CTDA_SL is the SAME signal for both CTDA inputs.... AND the value is 33.39 deg C.... For axial compressor discharge temperature. That seems ... odd. The...

ControlEng999, Thank you for the information. I am surprised at your surprise at the lack of tripping during first fire activities. Best of luck with the remainder of commissioning.

polup, Best of luck!

polup, "If the grid frequency decreases (i.e. load drop), the PV inverter would decrease its power output via a control loop. ..." Frequency decrease is usually the result of either a sudden increase in load, or a loss of generation (a unit is or units are shut down or tripped). They're both...

Phil Corso’s your VAr man on this forum. (Hope you like nebulous questions for answers.)

I know maths; I hesitate to always use it to explain phenomena when I don't know whom I'm communicating with. (Think explainig VArs beginning with vectors and angles....) But, thanks for the reminder.

Curious_One, Actually, I'm re-thinking my responses. There's just too much we don't know about the configuration, volumes, sizes of valves, pressure taps, control valve type, etc. There's almost nothing we know for sure, except the pressure (300 barg). We don't know what temperature the...

Curious_One, Is your post implying that the temperature change (caused by the flow of high-pressure into an area of lower pressure) is responsible for the decrease in pressure after the valve is closed to stop the flow of high-pressure into the pipe?

polup, I'm only familiar with home, roof-mounted solar PV cells and controllers--not industrial-sized PV installations, so I don't really know how the output of a solar PV installation would be controlled by operators. I suppose if there's some large rectifier bank that would be capable of...

CCG, The location of the pressure tap for the pressure gauge could also play a part in the readings you are reporting. And, again, the volume of high-pressure (air?) being admitted when you open the manual valve from the high-pressure source is also probably a large factor in the readings you...

CCG, Is the pressure gauge you are using not filled with oil (something that is commonly done to reduce gauge pressure can reading fluctuations? Is it possible to throttle the valve (presuming there is a valve) between the gauge and the pipe, as sort of an orifice, to try to reduce pressure...

Tyson Engineer, My watch isn't working and doesn't tell time. I shook it. Nothing changed. It didn't get wet. I have owned it for three years and it's never given a problem. What might be wrong? Is this question any easier to answer than the one you wrote? Hardly; wouldn't you want to...

MBA, Another thing--which may or may not be applicable, since we don't know very much about the equipment at your site--is that there were some GE-design heavy duty gas turbines which were sold without gas transfer valves or without the capability of transfer passages/orifices in the secondary...

Curious_One, Yes; I was thinking about the wires in behind, too. That would complicate things, if there wasn't enough length to accommodate the twists during removal AND allow you to try to push from behind once the fitting were out of the housing. I will say this: Over the decades I have...

So, I recall reading something about seals in a marketing email from Conax Technologies. Here's a link to what I think this is: Conax_Compression_Seals_5001D_Sensor-Wire-Seals.pdf (conaxtechnologies.com) They have other similar seals. If this is what it is, I would have unscrewed the...