The following diagram shows the port and starboard side
loadlines of a cargo ship. To see the port side loadlines, cover up the the
right l/3 of the sketch. To see the starboard side loadlines, cover up
the left 1/3 of the sketch. The WNA loadline has been
included in dotted lines as it is only required by vessels less than l00 metres
in length, trading in the North Atlantic during the winter season. The exact limits
and dates of the winter zone in the North Atlantic are given in the loadline
rules.
All the lines are 25 mm thick, are cut into the shell
plating and are painted white or yellow on a
dark background or black on a light background. The upper
edge of each loadline indicates its exact level.
The top of the deck line indicates where the top of the
freeboard deck would meet the outer side of the shell plating, if produced.
Directly below the deck line is the Plimsoll mark (or loadline disc) and
the vertical distance between them is called the Statutory
Summer Freeboard. The centre of the loadline disc is at the middle of the upper
edge of its 25 mm thick, painted, diametric line. lhe deck line and the
Plimsoll mark are situated exactly amidships.
Exactly 540 mm forward of the disc is a vertical line 25mm
thick with horizontal lines, measuring 230 mm x 25 mm, on each side of it. On its
forward side the lines are marked S, T and W (also WNA if applicable). The
lines on the after side are marked F and TF.
The upper edge of the line marked S is in line with the
horizontal line of the Plimsol mark. In summer zones, the ship can load up to
this line in salt water. The vertical distance between the upper edges of S and
T (and also between S and W) is l/48 of the summer draft of the vessel. The
dates and limits of winter, summer and tropical zones are given in the loadline
rules. The WNA mark, if applicable, if situated exactly 50 mm below the W mark
(measured between their upper edges).
No comments:
Post a Comment