Class 2 (2nd Engineer) MEP 📅 Oct 2022

Exam Question

Auxiliary boiler is periodically unattended and equipped with alarms to cover low water level, high steam pressure, and air and flame failure.

(a) State why and how fuel to the burners are automatically cut off under alarm conditions of water level, steam pressure, air and flame failure.

(b) Describe how and when each of the above alarms is tested without endangering the boiler.

Reference Answer

(a) The automatic fuel cutoff system is designed to prevent damage to the boiler and potential hazards to personnel.
Low Water Level:
Low water level risks overheating of boiler tubes, leading to tube failure. The low water level sensor detects this condition. The sensor signals the master controller, which activates the relay unit, ultimately shutting off the fuel solenoid valve, stopping fuel supply to the burners. A low-low water level triggers a complete boiler trip.
High Steam Pressure:

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