We have two GE Frame 5 Gas Turbines used for power generation running on Natural Gas as fuel. One has Mark V and other has Mark VIe control system.
Flame Detectors installed on both machines are of Make Honeywell Part No LG1093AA26 installed in combustors 7 and 8.
Recently we had a brief shutdown for Air Filter replacement. Flame intensity before shutdown was as below:
28-FD-7 = 848
28-FD-8 = 583.
During shutdown when 28-FD-7 was checked it was found faulty and was replaced with new one.
Intensity after shutdown is
28-FD-7 = 250
28-FD-8 = 600.
I have two questions:
1. What may be the probable cause of failure of FD-7 as it was working fine before shutdown.
2. Why the intensity of the new sensor is on the lower side. How is the intensity related to performance / health of a flame sensor. Can we relate the intensity number to the health of the sensor or it is more related to the flame condition in the combustion chamber.
Flame Detectors installed on both machines are of Make Honeywell Part No LG1093AA26 installed in combustors 7 and 8.
Recently we had a brief shutdown for Air Filter replacement. Flame intensity before shutdown was as below:
28-FD-7 = 848
28-FD-8 = 583.
During shutdown when 28-FD-7 was checked it was found faulty and was replaced with new one.
Intensity after shutdown is
28-FD-7 = 250
28-FD-8 = 600.
I have two questions:
1. What may be the probable cause of failure of FD-7 as it was working fine before shutdown.
2. Why the intensity of the new sensor is on the lower side. How is the intensity related to performance / health of a flame sensor. Can we relate the intensity number to the health of the sensor or it is more related to the flame condition in the combustion chamber.