GT 5-8 Alarm Trip List

Gas Turbine Units 5-8 Alarm, Trip, changeover and shut-down Set-points and Messages Message (Message No.) Aux. lube oil pump running. (1) Lube oil pressure low.(4)

Device/ setting 63 QA < 3.44 bar 63 QA < 3.44 bar Emergency lube oil pump 63QL motor running.(5) < 0.41 bar Lube oil tank temperature low. 26QL (6) < 18 °C Lube oil header temperature 26QA-1 high.(7) >74 °C Low lube oil pressure trip.(10) 63QT1A, 1B < 0.55 bar Lube oil header temperature 26QT1A, 1B high trip.(11) > 80 °C 3 Bearing temperature high. TTIB1 (12) > 371 °C Auxiliary hydraulic oil pump 63HQ-1 motor running.(14) < 93 bar

63FU-1 < 0.5bar

Consequence Cause Alarm Main lube oil pump supply pressure is insufficient. Alarm, AC Main lube oil pump supply pump cuts in. pressure is insufficient Alarm Very low lube oil pressure i.e. < 0.41 bar GT does not Temperature inside lube oil take start. tank is very low i.e. < 18 °C. Alarm Lube oil header temp. has increased beyond alarm limit GT trip Very low lube oil pressure i.e. < 0.55 bar. GT trip Lube oil header temp.has increased beyond trip limit. GT normal Temperature inside load shutdown tunnel is > 371 °C. Alarm Due to low hyd. press., Aux. hyd. pump is running after 14HS. Aux. hyd. Hyd. supply system pressure pump cuts in. has dropped below 93 bar. GT trip Trip oil press. to liquid fuel stop valve has dropped below 1.38 bar GT trip Trip oil press. to liquid fuel stop valve has dropped below 1.38 bar Running HSD forwarding pumps pump trips. suction pressure is < 0.5 bar. Alarm FO forwarding skid filter differential pressure is > 0.2 bar. Alarm HSD forwarding skid filter differential pressure is > 0.2 bar. GT trip Liquid fuel pressure before fuel stop valve VS-1 is < 2.41 bar. GT C/O to FO forwarding pumps suction HSD pressure is < 0.5 bar.

63FD-2 < 5.1 bar 63FU-3 < 4.5 bar 26FU-2

S/B pump starts. GT C/O to HSD GT C/O to

Hydraulic supply pressure low.(15) Liquid fuel hydraulic trip pressure low.(16)

63HQ-1 < 93 bar 63HL-1, 2, 3 < 1.38 bar

Gas fuel hydraulic trip pressure low.(18)

63HG-1, 2, 3 < 1.38 bar

Distillate pump upstream pressure low.(23) Heavy fuel filter differential pressure high (up stream). (24)

63FD-1 < 0.5 bar 63LF-1U > 0.2 bar

Distillate fuel filter diff. 63LF-1D pressure high (up stream). (25) > 0.2 bar Liquid fuel pressure low. (26) 63FL-2 < 2.41 bar Heavy pumps upstream pressure low, transfer to distillate.(27) Distillate fuel skid trouble. (35) Heavy fuel pressure low auto transfer to distillate. (37) Heavy fuel temp. low auto

Running FO forwarding pump delivery pressure is < 5.1 bar. FO pressure before C/O valve at filtering skid is < 4.5 bar. FO temperature at filtering

transfer to distillate. (38) AA differential pressure low, auto transfer to distillate.(39) Liquid fuel temperature low. (40)

< 100 °C 63AD-1 < 1.03 bar 26FD-2 < 46 °C

HSD GT C/O to HSD Alarm

Distillate fuel filter diff. press. 63LF-2D high (down stream). (45) > 1.5 bar

Alarm

Heavy fuel filter diff. pressure 63LF-2U high (down stream). (46) > 1.5 bar Heavy fuel temp. high. (48) 26FU-3 > 115 °C Heavy skid trouble. (49) 63FU-2 < 5.1 bar Turbine air inlet high drop. NGB30 CP002 (59) > 1300 Pascal

Alarm

Turbine air inlet excessive drop. (60) AA differential pressure low, auto transfer to distillate.(104) Atomising air temperature high. (105)

NGB30 CP003 > 1800 Pascal 63AD-1 < 1.03 bar 26AA-1 > 135 °C

GT normal shutdown Alarm

Loss of flame trip. (110)

28FD-3, 4, 5, 11

GT trip

Exhaust temperature high. (116)

TT-XD-1 to 24 > TTRX + 15 °C

Alarm

High exhaust temperature spread trip. (119) Exhaust over temperature trip. (120)

TT-XD-1 to 24 > TTX SPL TT-XD-1 to 24 TTRX + 22 °C or > 615 °C TT-XD-1 to 24

GT trip

Exhaust T/Cs open trip High vibration alarm. (129)

BB1-5 BB7-9 > 12.5 mm/sec. High vibration trip. (130) BB1-5 BB7-9 > 25 mm/sec. Electrical over speed trip. 77NH1, 2, 3 (140) > 3300 RPM Over speed bolt trip. (141) 12HA >3375 ± 50 RPM Loss of compressor discharge 96CD-1 pressure bias. (143) < 4.83 bar (at FS) Bearing drain temp high. LTTH-1(>77°C), (241) LTB1D to 3D, LTBT1D1 LTG2D, LTAGD > 100 °C

GT C/O to HSD

Alarm

Alarm

GT trip

GT trip Alarm

skid has dropped < 100 °C. Atomising air diff. press. on FO operation is < 1.03 bar. HSD temp. after heat exchanger at filtering skid is < 46 °C. HSD filter differential pressure at filtering skid is > 1.5 bar. FO filter differential pressure at filtering skid is > 1.5 bar. FO temperature at inlet of filtering skid is > 115 °C. FO at forwarding pump discharge is < 5.1 bar. Pulse air filter differential pressure is > 1300 Pascal. Pulse air filter differential pressure is > 1800 Pascal. Atomising air diff. press. on gas operation is < 1.03 bar. Temperature is > 135 °C at atomising air compressor input. Let me confirm how many detectors together cause trip. Exhaust temperature has increased > TTRX + 15 °C. (TTRX = temp. ctrl reference) Two adjacent T/Cs diff. temp. is above spread limit. Exhaust temperature has increased > TTRX + 22 °C or > 615 °C. Average exhaust temp. is < 121 °C after 50% speed. Vibration on any bearing is

GT trip GT trip GT trip Alarm GT trip

Compressor discharge press. at full speed is < 4.83 bar. Lube oil

Wheel space temp. diff. high.