What is the maximum duration that a Class B bulkhead can prevent the passage of flame?

The maximum duration that a Class B bulkhead can prevent the passage of flame is indeed 30 minutes. This classification refers to a specific standard established for fire resistance in bulkheads, which are walls that separate spaces in a vessel. A Class B bulkhead is designed to withstand fire for up to 30 minutes, providing an essential temporary barrier that allows for evacuation and fire control measures.

The rationale behind this classification is based on the materials and construction methods used for Class B bulkheads. They are often made from materials that, while not fireproof, can slow the spread of fire for a limited period, thereby giving occupants valuable extra time to escape and firefighters the opportunity to control the situation.

In fire safety regulations, knowing the specific timings of fire resistance classifications like Class B is crucial for understanding how long these barriers can function effectively during a fire incident. This information is essential for both training and practical firefighting scenarios on vessels.