SAFETY OF LIFE AT SEA Q3 7 



(ii) Sliding doors may be either : — 

 hand operated only, or 

 power operated as well as hand operated, 

 (iii) Authorized watertight doors may therefore be divided into three 

 Classes : — 



Class 1 — hinged doors; 

 Class 2 — hand operated sliding doors; 



Class 3 — sliding doors which are power operated as well as hand 

 operated, 

 (iv) The means of operation of any watertight door whether power 

 operated or not shall be capable of closing the door with the ship listed to 

 15 degrees either way. 



(v) In all classes of watertight doors indicators shall be fitted which 

 show, at all operating stations from which the doors are not visible, whether 

 the doors are open or closed. If any of the watertight doors, of whatever 

 Class, is not fitted so as to enable it to be closed from a central control station, 

 it shall be provided with a mechanical, electrical, telephonic, or any other 

 suitable direct means of communication, enabling the ofi&cer of the watch 

 promptly to contact the person who is responsible for closing the door in 

 question, under previous orders. 



(g) Hinged doors (Class 1) shall be fitted with quick action closing devices, 

 such as catches, workable from each side of the bulkhead. 



(h) Hand operated sliding doors (Class 2) may have a horizontal or vertical 

 motion. It shall be possible to operate the mechanism at the door itself 

 from either side, and in addition, from an accessible position above the bulk- 

 head deck, with an all round crank motion, or some other movement 

 providing the same guarantee of safety and of an approved type. Departures 

 from the requirement of operation on both sides may be allowed, if this 

 requirement is impossible owing to the layout of the spaces. When operating 

 a hand gear the time necessary for the complete closure of the door with 

 the vessel upright, shall not exceed 90 seconds. 



(/■) (i) Power operated sliding doors (Class 3) may have a vertical or 

 horizontal motion. If a door is required to be power operated from a central 

 control, the gearing shall be so arranged that the door can be operated by 

 power also at the door itself from both sides. The arrangement shall be such 

 that the door will close automatically if opened by local control after being 

 closed from the central control, and also such that any door can be kept 

 closed by local systems which will prevent the door from being opened from 

 the upper control. Local control handles in connection with the power gear 

 shall be provided each side of the bulkhead and shall be so arranged as to 

 enable persons passing through the doorway to hold both handles in the 

 open position without being able to set the closing mechanism in operation 

 accidentally. Power operated sliding doors shall be provided with hand gear 

 workable at the door itself on either side and from an accessible position 



Ch. 2 



