D
Friends/Gurus,
350MW, 9FA+e single shaft, Mark V, DLN 2.0+
We experienced difficulties in starting up the machine due to LFPG2HT "P2 POST IGNITION PRESSURE HIGH TRIP". During troubleshooting, we forced open ASV, force closed SRV and observed small passing on SRV side. The Fisher V300 ball valve was replaced last July 2010, so obviously it failed pre-maturely. Unfortunately spare valve will only arrive in 3 months time from now.
The unit tripped approximately 12 seconds after L28FD flame detected while FSRSU is driving the turbine to a Warming period for 1 min before going to Acceleration mode. P2 pressure FPG2 increased beyond tripping limit thus shut the unit down.<pre>
E 14.Feb.2011 06:51:14.188 L4 Master protective signal
A 14.Feb.2011 06:51:14.031 L86FPG2HT_A POST-IGNITION P2 HIGH TRIP
A 14.Feb.2011 06:51:13.469 L30TSVH HIGH SHAFT VOLTAGE
E 14.Feb.2011 06:51:13.250 L3SS_CON Static Starter Connect sequence complete
E 14.Feb.2011 06:51:13.188 L1X Master Control - Startup Permissive
E 14.Feb.2011 06:51:13.063 L43FG_PERM Gas fuel selection permissive
A 14.Feb.2011 06:51:13.031 L3ACS_ALM Servo Control Fault Trip
A 14.Feb.2011 06:51:12.906 L3GRVT_ALM STOP/SPEED RATIO VLV NOT TRACKING TRIP
A 14.Feb.2011 06:51:12.875 L30TSVH HIGH SHAFT VOLTAGE
A 14.Feb.2011 06:51:12.219 L30TSVH HIGH SHAFT VOLTAGE</pre>
1 of the temporary measure suggested was to increase KFPG2HT "P2 POST IGNITION TRIP HIGH SETPOINT" from 42 psi to perhaps 50 psi. Another option suggested was to lower FPKGNO "FUEL GAS PRESS RATIO CONTROL OFFSET" from -31.140 psi to -27 psi to compensate SRV passing rate.
GE has been conservative by suggesting valve replacement and obviously that is not possible at this point of time. Appreciate your valuable inputs especially on the risks / possible other option / etc etc.
Cheers.
350MW, 9FA+e single shaft, Mark V, DLN 2.0+
We experienced difficulties in starting up the machine due to LFPG2HT "P2 POST IGNITION PRESSURE HIGH TRIP". During troubleshooting, we forced open ASV, force closed SRV and observed small passing on SRV side. The Fisher V300 ball valve was replaced last July 2010, so obviously it failed pre-maturely. Unfortunately spare valve will only arrive in 3 months time from now.
The unit tripped approximately 12 seconds after L28FD flame detected while FSRSU is driving the turbine to a Warming period for 1 min before going to Acceleration mode. P2 pressure FPG2 increased beyond tripping limit thus shut the unit down.<pre>
E 14.Feb.2011 06:51:14.188 L4 Master protective signal
A 14.Feb.2011 06:51:14.031 L86FPG2HT_A POST-IGNITION P2 HIGH TRIP
A 14.Feb.2011 06:51:13.469 L30TSVH HIGH SHAFT VOLTAGE
E 14.Feb.2011 06:51:13.250 L3SS_CON Static Starter Connect sequence complete
E 14.Feb.2011 06:51:13.188 L1X Master Control - Startup Permissive
E 14.Feb.2011 06:51:13.063 L43FG_PERM Gas fuel selection permissive
A 14.Feb.2011 06:51:13.031 L3ACS_ALM Servo Control Fault Trip
A 14.Feb.2011 06:51:12.906 L3GRVT_ALM STOP/SPEED RATIO VLV NOT TRACKING TRIP
A 14.Feb.2011 06:51:12.875 L30TSVH HIGH SHAFT VOLTAGE
A 14.Feb.2011 06:51:12.219 L30TSVH HIGH SHAFT VOLTAGE</pre>
1 of the temporary measure suggested was to increase KFPG2HT "P2 POST IGNITION TRIP HIGH SETPOINT" from 42 psi to perhaps 50 psi. Another option suggested was to lower FPKGNO "FUEL GAS PRESS RATIO CONTROL OFFSET" from -31.140 psi to -27 psi to compensate SRV passing rate.
GE has been conservative by suggesting valve replacement and obviously that is not possible at this point of time. Appreciate your valuable inputs especially on the risks / possible other option / etc etc.
Cheers.