Question about gas turbine instrumentaion if u can

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Discussion Overview

The discussion revolves around troubleshooting an alarm related to a failed exhaust thermocouple in a GE gas turbine (Mark V, Frame 9) at a power station. Participants explore potential causes and solutions for the alarm notification received by the original poster (OP), focusing on instrumentation and maintenance issues.

Discussion Character

  • Technical explanation
  • Debate/contested
  • Experimental/applied

Main Points Raised

  • The OP reports an alarm indicating a failure of exhaust thermocouple #10 and seeks assistance in analyzing and resolving the issue.
  • Some participants suggest that the failed thermocouple likely needs replacement, while others emphasize the importance of checking the wiring and connectors for issues.
  • One participant questions whether the alarm indicates an open circuit or high exhaust gas temperatures (EGTs), seeking clarification on the nature of the failure.
  • Concerns are raised about the potential need for a shutdown if the thermocouple is indeed in a hot environment.
  • Participants discuss the possibility of erosion or corrosion affecting the thermocouple well and whether the thermocouple has reached its expected lifetime.
  • Some suggest contacting GE technical support for guidance, while others mention standard protocols for dealing with thermocouple failures.
  • A participant provides a link to a GE gas turbine data analysis system, hoping it may assist the OP.
  • There is a note that the OP may not return to the thread, indicating uncertainty about whether the issue has been resolved.

Areas of Agreement / Disagreement

Participants express a range of views on the cause of the alarm and the appropriate response, with no consensus reached on the specific steps to take. Some agree on the need to check for wiring issues, while others focus on the thermocouple itself.

Contextual Notes

Limitations include a lack of specific details about the alarm notification and the operational context of the gas turbine. The discussion does not resolve the technical uncertainties surrounding the thermocouple failure.

transporter84
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hi everyone:
i have a question about gas turbines :

i am working as instrumentation engineer( beggar ) at a power station .. we use gas turbine GE ( mark V) frame 9 .

i got that alarm : exhaust thermocouple # 10 fail , drop number 123

if anybody working in such a field can help me in analysis & solving that problem i will really approtiate that .


thank u so much
 
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I'm not sure anyone here (at the moment) is using the technology.

Here is the page for GE tech manuals. http://gepower.com/online_tools/tech_manuals.htm

I would think that part of the turbine/plant purchase would include manuals with warning messages/alarms and the appropriate actions to be taken.

Why not contact GE technical support directly?
 
Maybe I'm pointing out the obvious but it seems to me that you have a failed thermocouple that needs to be replaced.

CS
 
Can you be more specific about the alarm notification you received? Does that mean that you simply lost the TC, i.e. it is now open, or you are actually seeing high EGTs?
 
thank u everyone who care , about the alarm .. i wrote it as i saw it exactly .. nomore .. no less
 
As stewartcs indicated, the thermocouple could have simply failed, in which case it needs to be replaced. I'm not familiar with that T/C or Frame 9 turbine, but if it's hot (exhaust) this presumably would require that the unit be shutdown.

Is the thermocouple in the a well? Could the well have been breached (ostensibly due to erosion/corrosion)? Has the T/C reached it's lifetime or the min expected lifetime? Are there redundant T/C's?
 
Definitely contact GE they should be able to help you immediately. At least that is how it works at Rolls Royce with the industrial RB211 and Trend series. Also Astronuc makes a good point, maybe direct replacement is not an necessity usually there are two or three exhaust thermocouples and there should be standard protocol if it should be replaced immediately or not.
 
Here is a picture from a GE gas turbine data analysis system, I hope it may help.
More pictures can be found at http://www.leiosoft.com/ana/screen_en_win.htm"

http://www.leiosoft.com/ana/win/eng/Snap4.png
 
Last edited by a moderator:
From what I've seen thermocouples do fail but more often than not it is the wiring/connectors. Check the readings from any points you can between monitoring system and the actual thermocouple. Probably just a loose connector caused by constant vibrations.

Whatever it is you are going to need to go through troubleshooting to find it.
 
  • #10
Considering that this thread is just about 10 months old, I doubt the OP will be checking back.
 
  • #11
Hmm, guess he solved the problem then :)
 

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