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Inclining test

From Wikipedia, the free encyclopedia

An inclining test is a test performed on a ship to determine its stability, lightship weight and the coordinates of its center of gravity. The test is applied to newly constructed ships greater than 24m in length, and to ships altered in ways that could affect stability. Inclining test procedures[1] are specified by the International Maritime Organization and other international associations.

The weight of a vessel can be readily determined by reading draughts and comparing with the known hydrostatic properties. The metacentric height (GM), which dominates stability, can be estimated from the design, but an accurate value must be determined by an inclining test.

The inclining test is usually done inshore in calm weather, in still water, and free of mooring restraints to achieve accuracy. The GM position is determined by moving weights transversely to produce a known overturning moment in the range of 1-4 degrees if possible.[2] Knowing the restoring properties (buoyancy) of the vessel from its dimensions and floating position and measuring the equilibrium angle of the weighted vessel, the GM can be calculated.

As in a new ship test, the weight shifts have to be known and the angles of tilt measured. A series of weight (ballast) movements are used to obtain an average and variance for GM.

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Transcription

See also

References

  1. ^ International Maritime Organization (2002). Code on Intact Stability for all types of ships covered by IMO Instruments (2 ed.). IMO Publishing. ISBN 92-801-5117-7.
  2. ^ "Inclining test unified procedure" (PDF). IACS. January 2004. Archived from the original (PDF) on 11 July 2009. Retrieved 2 January 2010.

External links

This page was last edited on 29 March 2021, at 00:34
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