During vessel familiarization, you find the vessel you are newly assigned to as Chief Engineer has a high pressure CO2 system for the engine room. In what way are the high pressure CO2 bottle released in the event of an engine room fire?

Correct Answer: Option A — The master cylinder sends gas to the actuators on all bottles in the affected banks.

Engine room high-pressure CO2 systems utilize a cascading pilot cylinder arrangement. Actuating the master cylinder releases carbon dioxide gas through control lines to pneumatically open the discharge valves on all slave cylinders within the designated bank simultaneously.