For the purpose of this chapter, unless expressly provided
otherwise:
7.2.1
Certification of the test weights is
the verification of the weight marked on a test weight. Test weights
should be certified using a certificated scale. The weighting should
be performed close enough in time to the inclining test to ensure
the measured weight is accurate.
7.2.2
Draught is the vertical distance
from the moulded baseline to the waterline.
7.2.3
The inclining test involves
moving a series of known weights, normally in the transverse direction,
and then measuring the resulting change in the equilibrium heel angle
of the ship. By using this information and applying basic naval architecture
principles, the ship's vertical centre of gravity (VCG) is determined.
7.2.4
Lightship condition is a ship
complete in all respects, but without consumables, stores, cargo,
crew and effects, and without any liquids on board except that machinery
and piping fluids, such as lubricants and hydraulics, are at operating
levels.
7.2.5
A lightweight survey involves
taking an audit of all items which should be added, deducted or relocated
on the ship at the time of the inclining test so that the observed
condition of the ship can be adjusted to the lightship condition.
The weight, longitudinal, transverse and vertical location of each
item should be accurately determined and recorded. Using this information,
the static waterline of the ship at the time of the inclining test
as determined from measuring the freeboard or verified draught marks
of the ship, the ship's hydrostatic data, and the sea water density,
the lightship displacement and longitudinal centre of gravity (LCG)
can be obtained. The transverse centre of gravity (TCG) may also be
determined for mobile offshore drilling units (MODUs) and other ships
which are asymmetrical about the centreline or whose internal arrangement
or outfitting is such that an inherent list may develop from off-centre
weight.