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A power-driven vessel which because of her draught in relation to the available depth and width of navigable water is severely restricted in her ability to deviate from the course she is following.



Related Terms

FREE

1) A sailing course that is reaching or running. 2) A vessel is free, when she has a fair wind. 3) A freeing puff allows sheets to be eased, or the sail boat to be pointed higher. 4) When the water has been pumped out of a vessel and she is no longer encumbered.

MUD PILOT

A person who pilots a vessel by visually observing changes in the color of the water as the depth of the water increases or decreases.

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.

SCOURING BASIN

A basin containing impounded water which is released at about low water in order to maintain the desired depth in the entrance channel by scouring the bottom. Also called SLUICING POND.

BOILER

A closed vessel in which water is heated, steam is generated, steam is superheated, or any combination thereof, under pressure or vacuum by the application of heat from combustible fuels, electricity, or nuclear energy. The term dose not include such facilities of an integral part of a continuous processing unit but does include fired units of heating or vaporizing liquids other than water where these units are separate from processing systems and are complete within themselves.

DRAFT GAGE

  1. A modified U-tube manometer used to measure draft of low gas heads, such as draft pressure in a furnace, or small differential pressures, for example, less than 2 inches (5 centimeters) of water. 2. A hydrostatic depth indicator, installed in the side of a vessel below the light load line, to indicate amount of submergence.

LIGHTERING

The process of transferring cargo from one vesel to another to reduce the draft of the first vessel. Done to allow a vessel to enter a port with limited depth or to help free a grounded vessel.

FOUL

  1. Having freedom of motion interfered with by collision or entanglement; entangled; the opposite of clear. For instance, a rope is foul when it does not run straight or smoothly, and an anchor is foul when it is caught on an obstruction.
  2. A breach of racing rules.
  3. An area of water treacherous to navigation due to many shallow obstructions such as reefs, sandbars, or many rocks, etc.
  4. Foul the range: To block another vessel from firing her guns at a target.

DWAT

A common measure of ship carrying capacity. The number of tons (2240 lbs.) of cargo, stores and bunkers that a vessel can transport. It is the difference between the number of tons of water a vessel displaces 'light' and the number of tons it displaces 'when submerged to the 'deep load line'.' A vessel's cargo capacity is less than its total deadweight tonnage. The difference in weight between a vessel when it is fully loaded and when it is empty (in general transportation terms, the net) measured by the water it displaces. This is the most common, and useful, measurement for shipping as it measures cargo capacity.

STATIONARY WAVE

A wave that oscillates without progressing. One-half of such a wave may be illustrated by the oscillation of the water in a pan that has been tilted. Near the axis, which is called the node or nodal line, there is no vertical rise and fall of the water. The ends of the wave are called loops and at these places the vertical rise and fall is at a maximum. The current is maximum near the node and minimum at the loops. The period of a stationary wave depends upon the length and depth of the body of water. A stationary wave may be resolved into two progressive waves of equal amplitude and equal speeds moving in opposite directions. Also called STANDING WAVE.

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