In reviewing ship drawings with a new junior office you note that some divisional bulkheads are labeled A60. In the discussion with the junior officer, what should be noted is indicated by the label A60?

Correct Answer: Option C — Fire division boundary, A Class, with insulation that will limit temperature rise below the allowable level for 60 minutes.

An A-60 structural fire division is constructed of steel or equivalent material, stiffened as necessary, and insulated with approved non-combustible materials. It must prevent the passage of smoke and flame for 60 minutes and limit the unexposed side temperature rise.