Oil fuel spaces
23.  Passengers are not to be berthed or accommodated in a space adjoining an oil bunker unless separated therefrom by an additional steel vapour-proof bulkhead, so arranged that the space between the two bulkheads shall be well ventilated and accessible. No objection need be raised, however, to passenger spaces being situated on a deck forming the crown of an oil fuel space, provided that the deck is thoroughly oil tight, that within the quarters there are no manholes or openings to the oil spaces, that the flooring consists of a specially approved non-inflammable composition at least 1½ inches thick, and that the spaces are especially well ventilated.