their sills are below the deepest subdivision loadline, the following rules shall apply:- (I.) When the number of such doors exceeds 5 all the watertight sliding doors shall be power operated and shall be capable of being simultaneously closed from a station situated on the bridge, simul- taneous closing of these doors being preceded by a warning sound signal. (II.) When the number of such doors does not exceed 5- (i) if the criterion numeral does not exceed 30, all the watertight sliding doors may be operated by hand only; (ii) if the criterion numeral exceeds 30, but does not exceed 60, all the watertight sliding doors may be either dropping doors fitted with releasing and hand gear operated at the door and from above the bulkhead deck or doors op- erated by power. (iii) if the criterion numeral exceeds 60, all the watertight sliding doors shall be operated by power. (b.) If watertight doors which have sometimes to be open at sea for the purpose of trimming coal are fitted between bunkers in the between-decks below the bulkhead deck, these doors shall be operated by power. The opening and closing of these doors shall be recorded in the official log book. (c.) When trunkways in connection with refrigerated cargo are carried through more than one main transverse watertight bulkhead, and the sills of the openings are less than 7 feet (2.13 metres) above the deepest subdivision loadline, the watertight doors at such open- ings shall be operated by power. (10.) Portable plates on bulkheads shall not be permitted except in machinery spaces. Such plates shall always be in place before the ship leaves port, and shall not be removed at sea except in case of urgent necessity. The necessary precautions shall be taken in replac- ing them to ensure that the joints shall be watertight. (11.) All watertight doors shall be kept closed during navigation except when necessarily opened for the working of the ship, and shall always be ready to be immediately closed. (12.) Where trunkways or tunnels for access from crew's accom- modation to the stokehold, for piping, or for any other purpose are carried through main transverse watertight bulkheads, they shall be Poastp.1214 . watertight and in accordance with the requirements of Regulation XII. The access to at least one end of each such tunnel or trunkway, if used as a passage at sea, shall be through a trunk extending water- tight to a height sufficient to permit access above the margin line. The access to the other end of the trunkway or tunnel may be through 1208 TREATIES
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