Mobile Offshore Drilling Unit.


Related Terms

INCINERATION AREA

An officially designated offshore area for the burning of chemical waste by specially equipped vessels. The depiction of incineration areas on charts (in conjunction with radio warnings) is necessary to insure that passing vessels do not mistake the burning of waste for a vessel on fire.

CONSTRUCTION UNIT

A vessel equipped to assist during offshore construction and maintenance work.

LNB

A large buoy designed to take the place of a lightship where construction of an offshore light station i

ACCOMMODATION UNIT

Fitted with cabins and catering facilities for offshore crews. Semisubmersible accommodation units are often called 'Flotels'.

ARTICULATED LIGHT

An offshore aid to navigation consisting of a pipe attached to a mooring by a pivoting or universal joint; more accurate in position than a buoy but less than a fixed light.

FISHING ZONE

The offshore zone in which exclusive fishing rights and management are held by the coastal nation. The U.S. fishing zone, known as the fishery conservation zone, is defined under P.L. 94- 265. The la

MOBILE OFFSHORE DRILLING UNIT

A movable drilling platform used in offshore oil exploration and production. It is kept stationary by vertically movable legs or by mooring with several anchors. After drilling for oil it may be replaced by a production platform or a submerged structure.

ONSHORE WIND

Wind blowing from the sea towards the land. An OFFSHORE WIND blows in the opposite direction.

ROTARY CURRENT

A tidal current that flows continually, with the direction of flow changing through 360° during the tidal period. Rotary currents are usually found offshore where the direction of flow is not restricted by any barriers. The tendency for rotation is due to the Coriolis force and, unless modified by local conditions, is clock- wise in the Northern Hemisphere and counterclockwise in the Southern Hemisphere. The speed of the current usually varies throughout the tidal cycle, passing through the two maxima in approximately opposite directions and the two minima with the direction of the current at approximately 90° from the direction at time of maximum speed.

SEAWARD BOUNDARY

Limits of any area or zone offshore from the mean low, or mean lower low water line and established by an act of the U.S. Congress.

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