Section 32.56-30 - Category A machinery spaces: Bulkheads and decks-T/ALL(a) Bulkheads and decks that separate category A machinery spaces from cargo pumprooms must be "A" Class construction.(b) Bulkheads and decks that separate category A machinery spaces or cargo pumprooms, including the pumproom entrance, from accommodation, service, or control spaces must be "A-60" Class construction.