Boiler Overhaul. Boiler overhaul is done every 15 months to connect CF (Certificate of Fittness) or + 3 months + 3 months (approved) Step2 1)Lower firing, stop boiler operation and cooling down 2)Create boiler system isolation 3Open man hole boiler 4)Perform boiler pre-inspection (internal) 5)If there are defects such as cracks, it must be repaired first 6)Create mechanical ... Read More