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We are having a GE Frame 5, with Mark-6 HMI that has been tripping frequently due to unknown reasons. We observe from the MK-6 HMI, data values before and after unit shutdown.
Prior to Gas turbine shutdown, we observe the following: -
1. The FSG - GCV position command was 41.1943 and Feedback signal is 40.8317%. The FSROUT – GCV position reference command was 41.8629 and Feedback signal was 41.7574%.
2. The CSGV - IGV position command was 84.1362 and Feedback signal is 83.2053%. The CSRGVOUT – IGV position reference command was 85 and Feedback signal is 85%.
3. The FSGR - SRV position command was 22.9643 and Feedback signal is 23.5279%. The FRCROUT – SRV position reference command was 23.4037 and Feedback signal is 24.062 %.
After Gas turbine shutdown, we observe the following: -
4. The FSG - GCV position command was 41.1943 and Feedback signal is –4.92371%. The FSROUT – GCV position reference command was 41.8629 and Feedback signal was –25%.
5. The CSGV - IGV position command was 84.1362 and Feedback signal is 42%. The CSRGVOUT – IGV position reference command was 85 and Feedback signal is 42%.
6. The FSGR - SRV position command was 22.9643 and Feedback signal is –4.9927%. The FRCROUT – SRV position reference command was 23.4037 and Feedback signal is –5.0%.
The Alarms that were generated by the MK-6 HMI are:
21-June-2008 08:47:02.936 G1 0Q 0162 ALM INTERSTAGE PRESS. SENS. EXC. SPREAD ALARM
21-June-2008 08:47:03.058 G1 1Q 0064 ALM SEISMIC VIBRATION DIFF. TROUBLE ALARM
21-June-2008 08:47:03.096 G1 0Q 0064 ALM SEISMIC VIBRATION DIFF. TROUBLE ALARM
21-June-2008 08:47:03.702 G1 1Q 0162 ALM INTERSTAGE PRESS. SENS. EXC. SPREAD ALARM
21-June-2008 08:47:06.772 G1 0Q 0162 ALM INTERSTAGE PRESS. SENS. EXC. SPREAD ALARM
21-June-2008 08:47:15.578 G1 1Q 0162 ALM INTERSTAGE PRESS. SENS. EXC. SPREAD ALARM
21-June-2008 08:47:17.840 G1 0Q 0162 ALM INTERSTAGE PRESS. SENS. EXC. SPREAD ALARM
….
We have been suspecting following items below, which were also attended by doing good Preventative Maintenance during this shutdown:
1. Lube Oil System and Hydraulic system problem
2. SRV is not working properly
3. Dumping valve is not working well
We would like to have some opinion on this problem, and how we shall resolve it to restore the gas turbine operation.
Regards
Prior to Gas turbine shutdown, we observe the following: -
1. The FSG - GCV position command was 41.1943 and Feedback signal is 40.8317%. The FSROUT – GCV position reference command was 41.8629 and Feedback signal was 41.7574%.
2. The CSGV - IGV position command was 84.1362 and Feedback signal is 83.2053%. The CSRGVOUT – IGV position reference command was 85 and Feedback signal is 85%.
3. The FSGR - SRV position command was 22.9643 and Feedback signal is 23.5279%. The FRCROUT – SRV position reference command was 23.4037 and Feedback signal is 24.062 %.
After Gas turbine shutdown, we observe the following: -
4. The FSG - GCV position command was 41.1943 and Feedback signal is –4.92371%. The FSROUT – GCV position reference command was 41.8629 and Feedback signal was –25%.
5. The CSGV - IGV position command was 84.1362 and Feedback signal is 42%. The CSRGVOUT – IGV position reference command was 85 and Feedback signal is 42%.
6. The FSGR - SRV position command was 22.9643 and Feedback signal is –4.9927%. The FRCROUT – SRV position reference command was 23.4037 and Feedback signal is –5.0%.
The Alarms that were generated by the MK-6 HMI are:
21-June-2008 08:47:02.936 G1 0Q 0162 ALM INTERSTAGE PRESS. SENS. EXC. SPREAD ALARM
21-June-2008 08:47:03.058 G1 1Q 0064 ALM SEISMIC VIBRATION DIFF. TROUBLE ALARM
21-June-2008 08:47:03.096 G1 0Q 0064 ALM SEISMIC VIBRATION DIFF. TROUBLE ALARM
21-June-2008 08:47:03.702 G1 1Q 0162 ALM INTERSTAGE PRESS. SENS. EXC. SPREAD ALARM
21-June-2008 08:47:06.772 G1 0Q 0162 ALM INTERSTAGE PRESS. SENS. EXC. SPREAD ALARM
21-June-2008 08:47:15.578 G1 1Q 0162 ALM INTERSTAGE PRESS. SENS. EXC. SPREAD ALARM
21-June-2008 08:47:17.840 G1 0Q 0162 ALM INTERSTAGE PRESS. SENS. EXC. SPREAD ALARM
….
We have been suspecting following items below, which were also attended by doing good Preventative Maintenance during this shutdown:
1. Lube Oil System and Hydraulic system problem
2. SRV is not working properly
3. Dumping valve is not working well
We would like to have some opinion on this problem, and how we shall resolve it to restore the gas turbine operation.
Regards