AFF Exit Exam • Set 2 Question 5 of 30

What pre-release protocol must be completed before discharging CO2 into an engine room space?

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Direct Answer

Option A: Ensure all personnel are evacuated, ventilation fans stopped, and dampers closed tight

Before CO2 discharge, SOLAS requires the total evacuation of the space, cessation of ventilation, and closure of all dampers. This ensures the concentration of CO2 reaches the required level to extinguish the fire by displacement of oxygen. Failure to seal the space allows gas leakage, rendering the fixed system ineffective.

All Options

A

Ensure all personnel are evacuated, ventilation fans stopped, and dampers closed tight (Correct Answer)

B

Open skylights to vent pressure

C

Start emergency generator

D

Keep exhaust ventilation running at half speed

Detailed Explanation & Context

Before CO2 discharge, SOLAS requires the total evacuation of the space, cessation of ventilation, and closure of all dampers. This ensures the concentration of CO2 reaches the required level to extinguish the fire by displacement of oxygen. Failure to seal the space allows gas leakage, rendering the fixed system ineffective.

Relevant Framework: STCW 2010 Manila Amendments • DG Shipping E-Learning & Exit Exam Standards • Advanced Fire Fighting (AFF).

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Q1 Regarding deck and engine room operational protocols in Advanced Fire Fighting, what is the mandatory safety standard required under STCW Code Table A-VI/2? Q2 What is the primary function of the emergency fire pump isolation valve located on the main deck? Q3 Under SOLAS regulations, what is the minimum water capacity for the emergency fire pump on cargo vessels? Q4 What type of fixed fire extinguishing system is required for paint lockers having a deck area greater than 4 m²? Q5 What pre-release protocol must be completed before discharging CO2 into an engine room space? Q6 What is the principal extinguishing mechanism of High-Expansion Foam when applied to machinery space bilges? Q7 What is the maximum allowable pressure drop before an SCBA compressed air cylinder must be recharged? Q8 What is the function of the International Shore Connection fitted on shipboard fire mains? Q9 What is the primary objective of boundary cooling during a shipboard compartment fire? Q10 Under SOLAS Chapter II-2, how many firefighter outfits must be carried on cargo ships of 500 GT and above?