24.—(1) Weathertight doors above the bulkhead deck (except doors fitted in collision bulkheads to which regulation 22 applies) which are fitted in bulkheads which are required to be watertight or weathertight as the case may be and which separate or form the boundary of cargo spaces shall be closed and locked before the ship leaves its berth and be kept closed and locked until the ship has been secured at its next berth.
(2) Weathertight doors above the bulkhead deck fitted in the shell or in bulkheads which are required to be watertight or weathertight, other than those doors described in regulations 22(1) and 24(1), shall be kept closed whilst the ship is on any voyage except when opened on the express authority of the master.
(3) Any weathertight door which may be opened in accordance with the exception to paragraph (2) shall be kept clear of obstructions which might prevent its rapid closure.