Inclining test

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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.

Inclinings can be performed in service by averaging out the effects of motions caused by waves. As in a new ship test, the weight shifts have to be known and the angles of tilt measured. The effects of any mooring can be calculated and deducted. A series of weight (usually ballast) movements are used to obtain an average and variance for GM.

See also[edit]

• Metacentric height
• Naval architecture
• Semi-submersible

References[edit]

1. Jump up ^ 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. Jump up ^ "Inclining test unified procedure" (PDF). IACS. January 2004. Retrieved 2 January 2010. 

External links[edit]

• MOSIS

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Ship measurements

Length

• Length overall
• Length between perpendiculars
• Length at the waterline

Breadth

• Beam

Depth

• Draft
• Moulded depth
• Freeboard
• Waterline (Plimsoll Line)

Volume

Worldwide	Tonnage Gross tonnage Compensated gross tonnage Net tonnage
Specialized	Panama Canal/Universal Measurement System Thames measurement tonnage
Archaic	Gross register tonnage Net register tonnage

Capacity

Current	Deadweight tonnage Twenty-foot equivalent unit (Intermodal containers)
Archaic	Builder's Old Measurement (sailing vessels) Moorsom System (steamships)

Weight

• Displacement
• Loaded displacement
• Standard displacement
• Light displacement
• Normal displacement

Stability

• Inclining test
• List
• Angle of loll
• Metacentric height (GM)

Limits

• Aframax
• Baltimax
• Capesize
• Chinamax
• Handymax/Supramax
• Handysize
• Malaccamax
• Panamax and Neopanamax
• Q-Max (Qatar-max)
• Seawaymax
• Suezmax
• VLCC and ULCC

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Categories:

• Ship measurements