The upper edge of the hull. The top timber on the rail round the outer edge of the deck.


Related Terms

PARALLEL MID-BODY LENGTH

This describes the middle side area of a tanker's or other vessel's exterior hull which is flat and usually vertical. This is usually the area of the hull that is in contact with the pier when a vessel is docked. This area is measured from aft of the bow where the hull reaches maximum beam and then proceeds aft with little variance until the hull recesses again towards the centerline near the stern. This area is the same on both sides of a vessel and therefore runs in parallel down the middle of the ship.

The length of the mid-body is important to know when voyage planning to determine if a vessel will safely be able to moor at a particular facility. Also known as PBL, PMBL, or Mid-Body Length.

SEA VALVE

A through hull valve, a shut off on a plumbing or drain pipe between the vessel's interior and the sea.

SEA VALVE

A shut off valve through the hull for intake or discharge piping.

CENTRE OF BUOYANCY

The center of the area of the underwater transverse or longitudinal section of a hull at a particular trim, hence the point at which the force of buoyancy is regarded to be acting vertically upwards.

SHALLOW WATER EFFECT

The effect that due to the depth of water, the speed of the vessel and shape of the vessel's hull causes the vessel to sink deeper in the water especially in shallow water and at high speed. The vessel becomes sluggish in responding to the rudder.

LAUNCHING

The act or process of floating a ship after only hull construction is completed; in some cases ships are not launched until after all construction is completed.

HEAVE

The oscillatory vertical rise and fall, due to the entire hull being lifted by the force of the sea. Also called HEAVING

SEA CHEST

An opening for supplying seawater to condensers, pumps, etc. located in the hull below the waterline and having means for the attachment of the associated piping

SHELL PLATING

The plates forming the outer side and bottom skin of the hull

TRIMARAN

A triple hulled vessel

Related questions

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