Class 2 (2nd Engineer) MEP 📅 Apr 2018

Exam Question

A ship operating in the U.M.S. mode must have an automatic fire detection system for the machinery space.

(a) Sketch a line diagram of the system showing how shipboard mains supply is fed through battery charger and emergency battery to fire detector heads and fire zone indicator panel and alarms.

(b) In the event of a mains supply failure state the length of time for which the emergency battery should be capable of operating the system.

Reference Answer

(a) Line diagram of the system showing shipboard fire detector heads and fire zone indicator panels and alarms supplied by mains and emergency batteries.
(b) In the event of mains supply failure, the emergency battery must be capable of operating the fire detection system for at least 30 minutes
(c) System Integrity monitoring - Line termination and fault detection:
Zone Monitoring (K1, Lamp 1): A normally-closed relay (K1) is energized by the power supply. A closed circuit indicates a functioning zone. If power fails or a break occurs in the circuit for zone A, K1 de-energizes and Lamp 1 extinguishes, indicating a fault.

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