Hong Kong Regulations

MERCHANT SHIPPING (INSTRUCTIONS TO SURVEYORS) (PASSENGER SHIPS) REGULATIONS - REGULATION 20

Watertight decks, steps and flats

(1) Plating: The horizontal plating shall be at least 04 inch thicker than
required for bulkheads at corresponding levels.

(2) Beams: These shall be of the sizes given for stiffeners in Table 2,
Appendix II, in association with a spacing of 30 inches, except where beams
are fitted in short lengths bracketed at each end when they may be based on
Table 1.
The "length" (長度) to be used with the Tables is to be the greatest
distance between the points of support (when the beams are bracketed at one
end the length for Table 2 may be reduced by the width of the bracket)
and the "height" (高度) is to be the distance from the bulkhead deck to the
watertight deck or flat minus half the "length".

(3) Where frames pass through a watertight deck or step, watertightness is to
be maintained by means of caulked angle chocks or by cast iron or cast steel
chocks efficiently secured or rust jointed.

(4) The necessary supports to the beams are to be provided by bulkheads or by
efficient girders pillared as required, care being taken that the rivet
connections of the pillars are sufficient to withstand the load due to water
pressure. The distance between the lines of support is not to exceed about 15
feet.

"length" (長度)

"height" (高度)