What action must be taken regarding mechanical ventilation before releasing CO2 into engine room?
Direct Answer
Option C: Stop all fans and close all dampers tight
FSS Code requirements for fixed gas fire-extinguishing systems dictate that all ventilation must be shut down before discharge. Stopping fans and closing dampers prevents the ingress of fresh oxygen, which would otherwise fuel the fire, and ensures the CO2 concentration remains high enough to achieve total flooding extinguishment.
All Options
Detailed Explanation & Context
FSS Code requirements for fixed gas fire-extinguishing systems dictate that all ventilation must be shut down before discharge. Stopping fans and closing dampers prevents the ingress of fresh oxygen, which would otherwise fuel the fire, and ensures the CO2 concentration remains high enough to achieve total flooding extinguishment.
Relevant Framework: STCW 2010 Manila Amendments • DG Shipping E-Learning & Exit Exam Standards • Advanced Fire Fighting (AFF).
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