COC ORAL EXAM PREPARATION (PART-6) – BOILER OPERATION & BW TREATMENT
Boiler : Boiler Automatic Burning System: 1. With correct water level, steam pressure transmitter initiates cut-in at about 1.0 bar below working pressure. 2. Steam pressure transmitter initiates Master Relay to allow ‘Air On’ signal to force draught fan. 3. Air feedback signal confirms ‘Air On’ and allows 30-sec. delay for purge period. 4. Then …