6 replies to this topic

[Sharma Varun]

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Posted Today, 11:06 AM

Hello everyone,

 

This is regarding gas turbine operation.

There is a valve called False start drain valve, which operates in case of GT startup failure & drains the liquid in combustion chamber & associated piping.

I have a case, where this valve passed when the GT was running & combustion gas leaked to atmosphere via. open tundish drum leading to a hazardous condition.

I do not have sufficient documentation such as vendor P&IDs/cause & effect charts for the system, also with no prior experience associated with a GT, I have very limited know how about this system.

 

With limited exposure my suggestion was to get redundancy in the system to avoid this gas leakage to drain system.

 

So it would be greatfull if some one can share their experience on this issue, like in a normal GT system what safeguards are in place against above mensioned scenerio, or for matter of fact anything related to this valve & false start drain system.

 

Also I have one particular query, what happens to the combustion gas if the GT is running & accidently trips? I guess we must have some relief facility in place, apart from this liquid drain.

 

thanks regards,

Varun

 

[curious_cat]

Redundancy how?

[Sharma Varun]

Redundancy how?

Well by installing one more valve say an XV in the line with parallell logic.

[curious_cat]

 

Redundancy how?

Well by installing one more valve say an XV in the line with parallell logic.

 

 

Parallel logic should just make it worse, right? Now you have two potential failures that could leak out combustibles rather than one. 

[Sharma Varun]

 

 

Redundancy how?

Well by installing one more valve say an XV in the line with parallell logic.

 

 

Parallel logic should just make it worse, right? Now you have two potential failures that could leak out combustibles rather than one. 

Oh sorry i meant one more XV on the same line (in series), but with its own logic for actuaction

[curious_cat]

 

 

 

Redundancy how?

Well by installing one more valve say an XV in the line with parallell logic.

 

 

Parallel logic should just make it worse, right? Now you have two potential failures that could leak out combustibles rather than one. 

Oh sorry i meant one more XV on the same line (in series), but with its own logic for actuaction

 

 

 

What about the inverse risk? Of drain valves not actuating when you actually want them to? 

[Sharma Varun]

 

 

 

 

Redundancy how?

Well by installing one more valve say an XV in the line with parallell logic.

 

 

Parallel logic should just make it worse, right? Now you have two potential failures that could leak out combustibles rather than one. 

Oh sorry i meant one more XV on the same line (in series), but with its own logic for actuaction

 

 

 

What about the inverse risk? Of drain valves not actuating when you actually want them to? 

 

Well I am also wondering about the same but than there i already one valve in existing so this risk is already there, redundancy will avoid the passing scenerio.

I dont have any relevant experience as I wrote earlier, however I could not find reference of any such redundant  valve used anywhere else, so redudancy might not be the call.  

Can you suggest something in this regards.