Question 756 Deck Safety

The correct answer is D) the ventilation system is secured and all persons leave the space. The use of carbon dioxide (CO2) as a fire extinguishing agent in enclosed spaces, such as pump rooms, requires that the space be evacuated of all personnel. This is because CO2 displaces the oxygen in the air, creating an oxygen-deficient atmosphere that can quickly become hazardous or even fatal to anyone remaining in the space. Securing the ventilation system ensures that the CO2 remains in the space and effectively suppresses the fire. The other options are incorrect because: A) wearing damp cloths over the mouth and nose would not provide adequate protection against the oxygen-deficient atmosphere; B) keeping the ventilation system operating would dilute the CO2 concentration and reduce its fire-fighting effectiveness; and C) gas masks would not be sufficient to protect against the lack of oxygen in the space.