2. Measures taken to reduce the
hazards ensuring the safe and
reliable working
• Remnant Life Assessment ( RLA ) of
boiler pressure parts ,also a legal
requirement for unit,which have
completed 1 lakhs operating hours OR
15 years in service, which ever is earlier.
• Inspection and certification of the safety
valves
3. Measures taken to reduce the hazards ensuring
the safe and reliable working
• Conditioning monitoring of the boiler by
using NDT Techniques like inspection of
deposits in tubes of different
sections,hardness testing,Dye penetrate
and ultrasonic testing of weld joints.
• Trivi test; by increasing drum pressure
4. Measures taken to reduce the hazards ensuring
the safe and reliable working
• Destructive testing of sample tubes
during overhaul of boiler.( tensile test )
• Regular monitoring of tube
thickness,tube scanning and advance
techniques like LFED ( Low frequency
Electrodynamic Device.)
5. Measures taken to reduce the hazards ensuring
the safe and reliable working
• Ensuring proper protection by periodic
checks by simulating or relevant
procedures.( At the end of the outage
simulating scenarios / faults & checking
MFT and checking healthy working of
protection.)
• Hydro testing of boiler once in a year
6. Controls for boiler in service -
• Permissive for boiler purging prior to lightup.(
By using FD&ID fans to clear all explosive
mixture if any)
• Flame scanners-for detecting the flames of
the burners.( Sensing the flame by UV
sensors)
• Furnace draft control to avoid explosion /
implosion of boiler / ductings.
• Various other controls for monitoring feed
flow,combustion control etc
7. Controls for boiler in service -
• Acoustic sensors to detect the sound of the
tube leak in the furnace.
• Alarms and monitoring and controls to
maintain the water chemistry.
• Alarms and monitoring metal temperature of
pressure parts.( Water chemistry,pH
value,unwanted chemicals such as Silica)
• Gas Leak detection system in the firing aisle
of boiler and near gas station.
8. Controls for boiler in service -
• Regular house keeping reports and
checks.
• Provision for installing the rupture disc
in coal mill inlet air ducts is in progress
(Inside coal mill air inlet duct as
certified by NFPA )
.
