Measure the stand or fall of a ship, judging by the ship's stability. That how is a boat measured , the main is to calculate stability arm of various kinds of load cases. Early to map the righting arm curve, used to assist major pieces of goods or other security load, whether you need to plan for ballast water. But how is a boat measured specially, need the following two aspects to judge.
For its stability measure, there are two major aspects: the first part is the weather criteria: a sudden wind and roll criterion, the criterion rules of ship by external forces such as wind, calculate the roll moment and ship restoring moment, if the ship restoring moment is greater than or equal to the lateral tilting moment, argues that satisfy the stability requirement of meteorological criterion of the ship. The second aspect is the stability curve features: the ship's stability of different curve shape difference is very big, the stability curve shape differences affect differently on the ship's stability. According to the statistical results, IMO regulations curve characteristic value of ship's stability about do the rules. This is how is a boat measured made the introduction of two aspects.
Of course, in the process of protecting the stability of the ship, also may be damaged. Damage stability should be damage stability, is the ship after the break in a tank or the number of tank water should still maintain the float state of structure and the requirement of stability, is the ability to ship the remaining, is an important guarantee of ship safety performance. Main and ship damage stability of transverse bulkhead, especially about the division of watertight bulkhead and arrangement. In order to further guarantee the ship safety and preventing Marine pollution, international conventions and norms of the ship subdivision and damage stability of the demand is higher and higher. So, for this problem: how is a boat measured ,it needs to calculate with advanced knowledge, here don't do the calculation. If you need a deeper understanding, please refer to the relevant contents of the journal of ship statics. Hope it will be of benefit to you.