What are the emergencies in Boiler operation?
Major emergencies in Boiler Operation.
- Pressure parts failure
- Tubes leakage
- High furnace draft
- Low furnace draft
- High drum level
- Low drum level
- ID fan trip but FD and PA/SA fans not tripped
- Boiler feed pump stop
- Boiler feed pumps failure
- Feed control valve stuck
- Feed control valve malfunction
- Failure of start-up vent valve
- IBD and CBD valve failure
- Drum gasket failure/leakage
- Clinker formation in bed
- High bed temperature
- All safety valves pop up simultaneously
- Drum safety valves pop up whereas super heater line safety valve is not lifted
- Failure of safety valves
- Super steam temperature shoots up
- Boiler over pressure operation
- Boiler pressure not raising
- Furnace explosion
- Main steam line leakage
- Steam line drain valve failure
- Flame failure
- Fuel feeding system failure
- Uneven thermal expansion
- Boiler back fire
- Fuel heap in furnace
- Attemperator control valve failure
- Attemperator control valve malfunction
- Failure of drum level controller
- Failure of furnace pressure controller
- Failure of auto combustion
- DCS/PLC failure/malfunction
- Power supply failure to DCS or PLC
- DCS operation system hang up
What are the Emergencies in Ash handling system ?
- High ash level
- Ash conveying system failure
- Ash saturation in Hopper
- Ash handling internals burning due to high ash level
- Ash handling conveying line jamming
- Hopper Overflow / Ash Accumulation
- Conveyor Belt Failure (in dry ash system)
- Pneumatic System Failure (for dry fly ash)
- Clinker Formation in Bottom Ash Hopper
- Valve / Gate Failure
- Silo Overfilling (Fly Ash)
- Ash silo bag filters jamming
- Fire in bag filter
- Ash silo over pressure and explosion
- Fire Hazard (Dry Ash System)
What are the emergencies in coal handling plant?
- Conveyor Belt Failure (Tear / Snap / Jam)
- Conveyor pulley bearing failure
- Conveyor drive failure
- Tripping of Entire CHP (Power Failure / MCC Trip)
- Crusher / Feeder Choking
- Bunker Level Low / Coal Starvation
- Wet Coal Handling Problem
- Failure of Magnetic Separator / Metal Detector
- Stacker / Reclaimer Failure
- Dust Explosion Risk (Fine Coal Handling)
- Dust extraction system failure
- Fire incident in coal dust extraction system
- Fuel Oil System Failure (For Start-up Fuel)
- Overload tripping
- Reverse rotation of the conveyor
- Fire in Conveyor / Coal Yard / Bunker
What are the Emergency situations in Turbine operation??
- High bearing vibration
- High bearing temperature
- Low lube oil pressure
- High axial shift
- Main steam temperature shoot up
- High and low steam pressure
- Lube oil leakage
- Control oil pressure fluctuation
- Air ingress in lube oil system
- Control valves hunting
- Turbine over speed
- Low vacuum in condenser
- High exhaust pressure
- High bleed pressure
- More back pressure
- Wet steam at ESV inlet
- Turning Gear / Barring Gear Failure during start up
- High vibration due to critical speed during start up
- Ejector steam pressure fluctuation
- Gasket leakages in ejector
- U seal break in ejectors
- Vacuum traps failure in ejector
- Uneven thermal expansion in Turbine due to not following start up curves
- Turbine load hunting
- Lube oil pumps PRV failure
- High DP in lube oil and control oil filters
- Control oil line vibrations due to air ingress in oil
- Fire incidents near Turbine due to lube or control oil leakages
- Turbine trip logic failure
- Failure of I to H system
- Governor failure
- Back pressure from process
- Power export trip
- Input power supply failure to Governor
- Operation team Human errors
- Low load operation for long time
- Gland sealing system failure
- Oil vapour extraction system failure
- Air compressor failure
What are the emergency operation situations in Turbine cooling water system?
- Total Cooling Water Pumps Failure
- Low Cooling Water Flow
- High Cooling Water Temperature
- Condenser Tube Fouling / Choking
- Condenser tubes leakage
- Air ingress in cooling water system
- Cavitation in cooling water pumps
- Sudden Vacuum Drop
- Power failure
- Cooling tower blades looseness
- Improperly set blade angles
- No evaporation in cooling tower due to improperly set fills and drift eliminators
- No temperature drop in cooling tower
- Leakages in cooling tower underground pipe lines
- Percolation in cooling tower and low water level
What are the emergency operations conditions in Alternator?
- Overcurrent / Overload
- Stator Winding Overheating
- Rotor Earth Fault
- Loss of Excitation (Field Failure)
- Reverse Power (Motoring)
- Overvoltage
- Undervoltage
- Over frequency / Underfrequency
- High bearing temperature
- High bearing Vibrations
- Cooling System Failure
- Leakage in air cooler
- Differential Protection Operation
- Out of Synchronism (Pole Slipping)
What are the emergency operation conditions in water treatment plant?
- Raw Water Supply Failure
- Low reservoir level
- HRSCC-Clarifier not working properly
- High Turbid water at UF inlet
- UF choking
- RO membranes choked
- High conductivity and silica at RO outlet
- WTP chemical dosing pumps not working
- Lack of chemicals
- Poor quality chemicals
- High turbidity, conductivity, silica in raw water
- Pumps strainers frequent choking
- Chemical lines leakage
- Clarifier drain valve failure
- Clarifier mud transfer pump failure
- DM plant resin exhaust
- Low quality resin
- More DM water consumption by Boiler due to more steam demand from process plant
