Which option best describes the function of bulkheads and decks in sustaining fire boundaries?

• A. They prevent any water ingress.
• B. They form fire boundaries to limit the spread of fire between compartments.
• C. They only affect cooling.
• D. They are used for decoration.

Answer: (B)

Bulkheads and decks are built to create fire boundaries that confine heat, smoke, and flames to their original compartment. By providing fire-resistant barriers between spaces, they slow or stop the spread of a fire from one area to another, which helps protect crew, preserve critical systems, and buy time for firefighting and evacuation. These boundaries are rated to withstand heat for a specified period and work in tandem with doors, seals, and ventilation controls to remain effective even under fire conditions. While watertightness can be important for flooding, the primary purpose in this context is to maintain the separation between compartments to limit fire spread.