Which type of bulkhead has no requirements for preventing smoke or flame passage?

A Class C bulkhead is designed for specific usage where the primary focus is on structural integrity rather than fire resistance. Such bulkheads have no requirements to prevent the passage of smoke or flames, making them suitable for areas where fire containment is not critical. This classification allows for more flexibility in terms of materials used and is often employed in less critical spaces within a vessel.

In contrast, Class A and Class B bulkheads are constructed with the intent to provide fire-resistance and typically include specifications for smoke and flame suppression. Class A is engaged in the most stringent fire-resistance and isolation requirements, while Class B has a slightly lower threshold but still focuses on limiting the spread of fire and smoke. Class D is generally designated for non-rated bulkheads that also don’t adhere to fire safety requirements, but Class C is specifically noted for its lack of obligations regarding smoke and flame passage, marking it as distinct in this context.