Safety: SOLAS – Subdivision and
Stability, Machinery and
Electrical Installation EXAM /
STUDY GUIDE – with Questions
100% Solved
Vessel draft (draft in the American spelling, draught in the British) is one of
the principal dimensions of any
waterborne vessel and is defined in technical terms as the distance between the ship's
keel and the waterline of
the vessel.
The bulkhead deck is the uppermost weathertight deck to which
transverse watertight bulkheads are carried.
A margin line is desirable and the limit is taken when the waterline is tangent to a
line drawn 76 mm below
the bulkhead deck at side. This line is called the margin line.
Permeability of a space in a ship is the percentage of empty volume in that space.
Permeability is used
in ship survivability and damaged stability calculations in ship design. In this case,
the permeability of a space is a
percentage from 0 to 100. The percentage of volume of vacant space which will be
occupied by water during flooding
inside the ship. Thjs is the remaining space or volume not occupied by cargo or vacant
space that would be occupied
by water in case of flooding.
, Subdivision load line is a waterline used in determining the subdivision of the ship.
The subdivision load lines assigned and marked shall be recorded in the Passenger
Ship Safety Certificate, and shall
be distinguished by the notation C.1 for the principal passenger condition, and C.2,
C.3, etc., for the alternative
conditions.
In no case shall any subdivision load line mark be placed above the deepest load line
in salt water as determined by
the strength of the ship or the International Convention on Load Lines in force.
Whatever may be the position of the subdivision load line marks, a ship shall in no
case be loaded so as to submerge
the load line mark appropriate to the season and locality as determined in
accordance with the International
Convention on Load Lines in force.
Deepest subdivision load line is the waterline which corresponds to the greatest
draught permitted by the subdivision
requirements which are applicable.
Length of the ship is the length measured between perpendiculars take at the
extremities of the deepest subdivision
load line.
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