COLD START
1) After Capital overhaul.
2) After Annual overhaul.
3) After any major rectification work like H2 leakage / T-G Bearing High Vibrations / Stator winding fault / Rotor earth fault.
WARM START
1) After LTSH, SH Re heater tube leak rectifications.
2) After H2 leakage - Rectification, After Auxiliaries like PA Fan / CW pump motor rewinding.
3) Reserve shutdown due to High frequency, CW Sump level (River level) problem.
4) Electrical faults like Surge Capacitor failure / Rotor earth fault / Stator Earth fault / GT Buchholzs.
5) Coal shortage.
HOT START
1) Economizer tube failure.
2) Water wall tube failure.
3) Turbine impulse line leakage.
4) MS-Valves heavy gland leak.
5) Generator X-r bushing oil leaks.
6) Gland cooler gasket failure (leakages in condensate flow path) , Turbine lube oil cooler leaks.
7) Cable flash over of Unit bushes / UAT etc.
8) Small maintenance works on feed water line, de-Aerator etc. / small fire hazard
9) Start up after fictions tripping (Governing System trouble / I&C trouble.
10) Start up after trip out due to Mal-operation human error / Instrument error or relay / Protection, Momentary drum level / draft / vacuum.