Hong Kong Regulations

MERCHANT SHIPPING (INSTRUCTIONS TO SURVEYORS) (PASSENGER SHIPS) REGULATIONS - REGULATION 23

Watertight tunnels

(1) The sizes of the stiffeners shall be in accordance with Table 5, Appendix
II in association with a spacing of 36 inches. The foot of each stiffener is
to overlap and be attached to the tunnel base angle in all cases.

(2) Curved plating may be of the thickness given in Table 4 for 30 inch
spacing, but flat plating is to be of the thickness required for the actual
spacing of the stiffeners.