Hong Kong Regulations

MERCHANT SHIPPING (INSTRUCTIONS TO SURVEYORS) (PASSENGER SHIPS) REGULATIONS - REGULATION 6

Definition of subdivision terms

(1) The Subdivision Load-line (分艙載重線) is the water-line drawn
parallel to the keel, used in determining the subdivision of the ship. (See
also paragraph 16).

(2) The Length of the Ship (L) (船舶長度(L)), in ships of the usual form
at the ends, is to be measured between perpendiculars taken at the extremities
of the deepest subdivision load-line.* (See note (i), Appendix I).

(3) The Breadth of the Ship (B) (船舶寬度(B)), is the extreme width from
outside of frame to outside of frame at or below the subdivision load-line.

(4) The Bulkhead Deck (艙壁甲板) is the uppermost continuous deck to which
all transverse watertight bulkheads are carried. (See also paragraph 7).

(5) The Margin Line (限界線) is a line drawn parallel to the bulkhead deck
at side line, and three inches below the upper surface of that deck at side.+
(See also paragraph 7 and Notes, Appendix I).

(6) The Draught (d) (吃水(d)) is the vertical distance from the top of keel
amidships to the subdivision load-line.

(7) The Freeboard (f) (乾舷(f)) is the vertical distance from the
subdivision load-line to the margin line amidships. (See also Notes, Appendix
I).

(8) The Sheer (舷弧) of the bulkhead deck at any point is the vertical
distance between the beam at side line at that point and a line drawn parallel
to the subdivision load-line at the height of the beam at side line amidships.
(See also Notes and Diagrams 1 to 6, Appendix I).

(9) The Block Co-efficient of Fineness of Displacement to Subdivision
Load-Line (至分艙載重線的排水量方形系數) referred to in Appendix
I shall be determined as follows-Volume of displacement to moulded lines
divided by (L. B. d.).

(10) The Permeability (m) (滲透率(m)) of a space is the percentage of that
space which can be occupied by water. The volume of a compartment which
extends above the margin line shall be measured only to the height of that
line. (See paragraphs 9 and 11).

(11) The Machinery Space (機艙) is to be taken as extending in length
between the extreme main transverse watertight bulkheads bounding the spaces
devoted to the main and auxiliary propelling machinery, including boilers when
installed, and it shall contain all permanent coal bunkers. (See also
paragraph 11).

(12) Passenger Spaces (客艙) are those which are provided for the
accommodation and use of passengers, excluding baggage, store, provision and
mail rooms. For the purposes of paragraphs 9 and 11, spaces provided below the
margin line for the accommodation and use of the crew shall be regarded as
passenger spaces.

(13) A Watertight Deck (水密甲板) is a deck so constructed as to prevent
water under pressure from passing through in either an upward or a downward
direction.

(14) A Weathertight Deck (風雨密甲板) is one through which, in ordinary
sea conditions, water will not penetrate in a downward direction. The bulkhead
deck is in all cases to be weathertight in this sense unless there is a deck
above it which is weathertight.

(15) Units of Measurement. Except where otherwise specified all linear
dimensions are to be in feet and volumes in cubic feet, the latter being
calculated to moulded lines.

(16) For floodable length (可浸長度), permissible length (許可長度),
factor of subdivision (分艙因數) and criterion of service (業務衡準)
see paragraphs 7, 10, and 11 respectively.
___________________________________________________________________ Note:

* No adjustment to this length will, as a general rule, be necessary unless
the sectional area at the after perpendicular exceeds one-tenth of the midship
sectional area, in which case full particulars should be submitted in order
that an equitable length may be determined. + Where there is a variation in
the thickness of the bulkhead deck at side, the top of the deck should be
taken at the least thickness of the deck at side above the beam. If desired,
however, the top of the deck may be taken at the mean thickness of the deck at
side above the beam as calculated for the whole length of the deck; in this
calculation no greater thickness is to be used than the least thickness plus
two inches. The Subdivision Load-line (分艙載重線) The Length of the Ship
(L) (船舶長度(L)) The Breadth of the Ship (B) (船舶寬度(B)) The
Bulkhead Deck (艙壁甲板) The Margin Line (限界線) The Draught (d)
(吃水(d)) The Freeboard (f) (乾舷(f)) The Sheer (舷弧) The Block
Co-efficient of Fineness of Displacement to Subdivision Load-Line
(至分艙載重線的排水量方形系數) The Permeability (m)
(滲透率(m)) The Machinery Space (機艙) Passenger Spaces (客艙) A
Watertight Deck (水密甲板) A Weathertight Deck (風雨密甲板) For
floodable length (可浸長度), permissible length (許可長度), factor of
subdivision (分艙因數) and criterion of service (業務衡準)