Question 344Safety & Environmental - 1st Asst/Chief

The correct answer is B) "B" class bulkheads must not allow flame passage for 30 minutes when subjected to a fire test. This is because the "B" class bulkhead designation indicates that the bulkhead must be able to prevent the passage of flame for a minimum of 30 minutes when subjected to a standardized fire test. This requirement is specified in international regulations for maritime safety, such as the Safety of Life at Sea (SOLAS) convention. The other options are incorrect because they do not accurately reflect the fire resistance requirement for "B" class bulkheads. Option A specifies a 15-minute fire resistance, which is lower than the 30-minute requirement. Options C and D specify 60 and 120 minutes, respectively, which are higher than the actual "B" class standard.