Ours is frame 6B gas turbine. After we carrying out maintenance work on Burner nozzle cleaning as a result of its tripping on combustion trouble we decided to put the unit on stream.

When the unit attains 100% speed the turbine status was still indicating "Acceleration" for about 10 minutes and it did not reach FSNL (5166rpm). We decided to shut-down the machine.

Can somebody help please.
Regards.
Dottey.

 

I have a question (well, several, actually).

We are not omniscient and we can't know what fuel you were burning, what speed the unit "stalled" at, what kind of troubleshooting you did, what the fuel control valve(s) were doing (what position(s) they were at), what Process- and/or Diagnostic Alarms were annunciated, what kind of control system you have, what the exhaust temperature spreads were while the unit was "stalled" at less than FSNL, etc.

This site doesn't use avatars so we can't check to see how old your machine is, what kind of control system it has, what kind(s) of fuel(s) are typically burned, what kind of device it's driving. We are BLIND because we have no information to work from, except that, "It didn't work."

Did anyone try using the RAISE switch/pushbutton/target to increase the speed? If so, what was the result?

What mode was selected on the operator interface: FIRE, AUTO, or REMOTE?

If someone unknown to you walked up to you and said, "I have a Seiko watch, and it shows the incorrect time. The crystal of the watch was dirty, and I cleaned it, but it still doesn't show the correct time. Can you help me?" What would you say? Let's even say that you are an experienced watchmaker or watch repair person.

Would you ask what time the watch was currently indicating?

Would you ask if the questioner needed to know the correct time because he (or she) had some imminent appointment to be present at?

Have you assumed the watch was a wristwatch? It might be a pocket watch, or a clip watch. Would you ask what kind of watch it was?

Would you ask by how much the watch differed from the actual time?

Would you ask if the questioner was confident of the reference used to decide the time was incorrect?

Would you ask if the watch was available to look at?

Would you ask if the watch was analog or digital?

Would you ask if changing the time to the correct time had been tried to see if the watch would keep time properly?

Would you ask if it was running?

Would you ask if it used a battery, or if it was self-winding, or if it needed to be wound?

Would you ask how long it had been since the battery had been changed, or it had been shaken to operate the self-winding mechanism, or if the watch had been wound recently?

If the watch was an analog watch would you ask if all of the hands were properly attached to the center stems?

If the watch was a digital watch would you ask if all the segments of the display were working correctly?

Not knowing the individual, would you assume the watch was oriented correctly when being looked at? (In other words, was it on the questioner's arm correctly?)

You see, the questioner did not provide any information of value in the original question, nor was an offer made to produce the watch for examination. You would have to ask multiple questions to try to help the person (all you know is that it's made by (or for) Seiko).

It's presumed this answer is kind of critical for you, because big machines like this are used for generating power, or running compressors, and maybe even for producing steam (with the exhaust heat). So, instead of providing as much information as you could in the original post to get as quick and concise a reply as possible, you have chosen to ask a very general question, let us offer up some things to look at and try, and then you will likely write back to say, "We've already tried that and it didn't work."

Are you using this site as some kind of validation that what you tried was the obvious resolution? And then you're going to tell us that you already tried that and it didn't work?

There are some very knowledgeable and helpful people here at control.com, willing to freely share their knowledge and experience. But, you gotta give us more to go on than, "It didn't work."

Best of luck with your turbine and your problem. Because we can't give you any more than, "Give us more information."

 

Dear,

If the unit is running near to 100% but is not showing FSNL, did you check that the Aux.Hydraulic pump stopped/cut off at around 95% TNH. If not you will not receive FSNL indication.

Mambo

 

In addition to hydraulic pump please insure that Auxiliary lube oil pump should be stopped and also check bleed valve limit switch, it should be closed.