During repairs it is necessary to replace an...

Question 1 / 270705eccef9cbacbc34ba4d45bf2

Question 1 of 270705eccef9cbacbc34ba4d45bf2

During repairs it is necessary to replace an existing vessel bulkhead. Drawings indicate the bulkhead is A60. "A" indicates which of the following?

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Question 1 of 27070

During repairs it is necessary to replace an existing vessel bulkhead. Drawings indicate the bulkhead is A60. "A" indicates which of the following?

🔍 Key Concepts

• Fire integrity classes (A, B, C) for bulkheads and decks • Meaning of the letter vs the number in notations like A60, A30, B15 • What "integrity" means in a standard fire test (flame and smoke passage)

💭 Think About

• Ask yourself: does the letter (A, B, C) describe the time or the type/standard of fire protection? • Think about what the number in A60 refers to – is that the time the bulkhead must resist fire, or something else? • If the number already looks like a time in minutes, what does that imply about what the letter must stand for?

✅ Before You Answer

• Verify what A-class division is required to prevent: passage of flame and smoke through the bulkhead for the entire test period • Confirm from SOLAS/46 CFR that A-class, B-class, and C-class are defined by construction/materials and insulation performance, not by the number alone • Check that you are not confusing the requirement for "no flame/smoke passage" with the insulation (temperature rise) criteria, which are listed separately in the rule.

Question 1 of 27070

During repairs it is necessary to replace an existing vessel bulkhead. Drawings indicate the bulkhead is A60. "A" indicates which of the following?

"A" class bulkheads must not allow flame or smoke passage for 15 minutes when subjected to a fire test

"A" class bulkheads must not allow flame or smoke passage for 30 minutes when subjected to a fire test

"A" class bulkheads must not allow flame or smoke passage for 60 minutes when subjected to a fire test

"A" class bulkheads must not allow flame or smoke passage for 120 minutes when subjected to a fire test

Question 1 / 270705eccef9cbacbc34ba4d45bf2

Question 1 of 270705eccef9cbacbc34ba4d45bf2

During repairs it is necessary to replace an existing vessel bulkhead. Drawings indicate the bulkhead is A60. "A" indicates which of the following?

Back

Question 1 of 27070

During repairs it is necessary to replace an existing vessel bulkhead. Drawings indicate the bulkhead is A60. "A" indicates which of the following?