Question 68 ONC04 - Mate of LT 500-1600 GRT

The Correct Answer is C 1. **Why Option C ("Navigation spaces") is correct:** Navigation spaces (such as the wheelhouse/bridge) are defined as 'accommodation spaces' or 'service spaces' in maritime regulations. Cargo tanks carrying flammable liquids (Grades A, B, C, or D) must be fully isolated and segregated from accommodation and service spaces, as well as machinery spaces, by means of gastight steel bulkheads or decks, and often by intervening spaces like cofferdams or pump rooms, to prevent the migration of flammable or toxic vapors into areas occupied by the crew. This is a fundamental safety requirement to protect the crew and the control center of the vessel. 2. **Why the other options are incorrect:** * **A) Pump rooms:** Pump rooms are *required* to be segregated from cargo tanks, but they are not spaces *requiring* segregation *from* cargo. Instead, pump rooms are specifically designed *intervening* spaces associated with the cargo system (containing pumps and piping). They are treated as hazardous zones themselves (Zone 1) and are essential parts of the hazardous area that must be segregated from safe areas like accommodation, but their primary function is to directly serve the cargo tanks. * **B) Enclosed deck spaces:** While enclosed deck spaces (like stores or workshops located on the main deck) must be adequately ventilated and, if they are adjacent to hazardous areas, they must prevent vapor ingress, they are not universally required to be segregated in the same manner as accommodation or machinery spaces. The main deck itself is often part of the hazardous zone. * **D) Cofferdams:** Cofferdams are empty, void spaces specifically *used* as the means of segregation (i.e., a buffer) between cargo tanks and other segregated areas (like machinery spaces or fresh water tanks). They do not require segregation *from* the cargo, but rather *perform* the function of segregation.