There is an urgent issue at one of our gas turbine frame 9E. Due to drop in Gas Pressure at our site, GTs load dropped to almost 15 MWs. After gas pressure stability, GT-1 and GT-3 load increased and mode changeover was successful. But on GT-2, mode changeover failed on following alarms.<pre>
2019-05-25T13:38:51.124 2019-05-25T13:38:51.129 G2 PRC ALARMED G2.L28FSD_ALM SECONDARY FLAME DETECTOR TROUBLE ALARM
2019-05-25T13:39:51.724 2019-05-25T13:39:51.723 G2 Event ALARMED G2.L28FDE Flame Detector Channel #5 Flame Detector Channel #5 2 99 Boolean TRUE Good
2019-05-25T13:39:51.684 2019-05-25T13:39:51.692 G2 Event ALARMED G2.L28FDF Flame Detector Channel #6 Flame Detector Channel #6 2 99 Boolean TRUE Good
2019-05-25T13:39:51.244 2019-05-25T13:39:51.255 G2 Event NORMAL G2.L28FDE Flame Detector Channel #5 Flame Detector Channel #5 1 99 Boolean FALSE Good
2019-05-25T13:39:50.564 2019-05-25T13:39:50.567 G2 Event ALARMED G2.L28FDE Flame Detector Channel #5 Flame Detector Channel #5 2 99 Boolean TRUE Good
2019-05-25T13:39:50.444 2019-05-25T13:39:50.442 G2 PRC ALARMED G2.L83LLEXT_ALM EXTEND L-L MODE HIGH EMISSIONS - ALARM EXTEND L-L MODE HIGH EMISSIONS - ALARM 2 99 Boolean TRUE Good
2019-05-25T13:39:49.404 2019-05-25T13:39:49.411 G2 Event NORMAL G2.L28FDE Flame Detector Channel #5 Flame Detector Channel #5 1 99 Boolean FALSE Good
2019-05-25T13:39:47.844 2019-05-25T13:39:47.848 G2 Event ALARMED G2.L28FDE Flame Detector Channel #5 Flame Detector Channel #5 2 99 Boolean TRUE Good
2019-05-25T13:39:47.764 2019-05-25T13:39:47.770 G2 Event NORMAL G2.L28FDE Flame Detector Channel #5 Flame Detector Channel #5 1 99 Boolean FALSE Good
2019-05-25T13:39:47.484 2019-05-25T13:39:47.489 G2 Event ALARMED G2.L28FDE Flame Detector Channel #5 Flame Detector Channel #5 2 99 Boolean TRUE Good
2019-05-25T13:39:47.404 2019-05-25T13:39:47.411 G2 Event ALARMED G2.L28FDG Flame Detector Channel #7 Flame Detector Channel #7 2 99 Boolean TRUE Good</pre>
During mode changeover, when transfer valve open to 22% and primary valve closes to 7%, all secondary flame scanners start reading zero due to which mode changeover failed. Machine went into extended lean lean. However spread and exhaust thermocouples readings are normal and stable.
This issue arrived on Friday, and since then many attempts were taken but failed. Case is already put up with GE for their recommendations.
Kindly put your valuable suggestions on this issue, have you faced any such scenario.
Regards,
Waqas
2019-05-25T13:38:51.124 2019-05-25T13:38:51.129 G2 PRC ALARMED G2.L28FSD_ALM SECONDARY FLAME DETECTOR TROUBLE ALARM
2019-05-25T13:39:51.724 2019-05-25T13:39:51.723 G2 Event ALARMED G2.L28FDE Flame Detector Channel #5 Flame Detector Channel #5 2 99 Boolean TRUE Good
2019-05-25T13:39:51.684 2019-05-25T13:39:51.692 G2 Event ALARMED G2.L28FDF Flame Detector Channel #6 Flame Detector Channel #6 2 99 Boolean TRUE Good
2019-05-25T13:39:51.244 2019-05-25T13:39:51.255 G2 Event NORMAL G2.L28FDE Flame Detector Channel #5 Flame Detector Channel #5 1 99 Boolean FALSE Good
2019-05-25T13:39:50.564 2019-05-25T13:39:50.567 G2 Event ALARMED G2.L28FDE Flame Detector Channel #5 Flame Detector Channel #5 2 99 Boolean TRUE Good
2019-05-25T13:39:50.444 2019-05-25T13:39:50.442 G2 PRC ALARMED G2.L83LLEXT_ALM EXTEND L-L MODE HIGH EMISSIONS - ALARM EXTEND L-L MODE HIGH EMISSIONS - ALARM 2 99 Boolean TRUE Good
2019-05-25T13:39:49.404 2019-05-25T13:39:49.411 G2 Event NORMAL G2.L28FDE Flame Detector Channel #5 Flame Detector Channel #5 1 99 Boolean FALSE Good
2019-05-25T13:39:47.844 2019-05-25T13:39:47.848 G2 Event ALARMED G2.L28FDE Flame Detector Channel #5 Flame Detector Channel #5 2 99 Boolean TRUE Good
2019-05-25T13:39:47.764 2019-05-25T13:39:47.770 G2 Event NORMAL G2.L28FDE Flame Detector Channel #5 Flame Detector Channel #5 1 99 Boolean FALSE Good
2019-05-25T13:39:47.484 2019-05-25T13:39:47.489 G2 Event ALARMED G2.L28FDE Flame Detector Channel #5 Flame Detector Channel #5 2 99 Boolean TRUE Good
2019-05-25T13:39:47.404 2019-05-25T13:39:47.411 G2 Event ALARMED G2.L28FDG Flame Detector Channel #7 Flame Detector Channel #7 2 99 Boolean TRUE Good</pre>
During mode changeover, when transfer valve open to 22% and primary valve closes to 7%, all secondary flame scanners start reading zero due to which mode changeover failed. Machine went into extended lean lean. However spread and exhaust thermocouples readings are normal and stable.
This issue arrived on Friday, and since then many attempts were taken but failed. Case is already put up with GE for their recommendations.
Kindly put your valuable suggestions on this issue, have you faced any such scenario.
Regards,
Waqas