Greetings,
One of our 7FA turbine had high dynamic pressure in can 3 and 4 while running on natural gas and the liquid fuel re-circulation was on. Now the unit is off, and while liq fuel re-circulation is on, the 3 way valve is passing liquid fuel to the liquid fuel nozzle and combustor and it is going to the the false start drain in the 7 lower cans. The problem now we don't know which can has the passing because even if the 3 way valve in can 2 (which doesn't have false start drain) is passing, then the liquid would go to lower cans through the cross fire tube and drain there. Is there a method of knowing which valve is passing without opening the DLN and see through the liquid nozzle while re-circulation is on?
I am relatively new employee but I heard that this is not the first time the 3- way valve is passing in the plant. Anyone experienced this issue and discovered the real cause behind it. This would help me investigate the problem. Thank you
One of our 7FA turbine had high dynamic pressure in can 3 and 4 while running on natural gas and the liquid fuel re-circulation was on. Now the unit is off, and while liq fuel re-circulation is on, the 3 way valve is passing liquid fuel to the liquid fuel nozzle and combustor and it is going to the the false start drain in the 7 lower cans. The problem now we don't know which can has the passing because even if the 3 way valve in can 2 (which doesn't have false start drain) is passing, then the liquid would go to lower cans through the cross fire tube and drain there. Is there a method of knowing which valve is passing without opening the DLN and see through the liquid nozzle while re-circulation is on?
I am relatively new employee but I heard that this is not the first time the 3- way valve is passing in the plant. Anyone experienced this issue and discovered the real cause behind it. This would help me investigate the problem. Thank you