Ships
A vessel may have a single ballast tank near its center or multiple ballast tanks typically on either side. A large vessel typically will have several ballast tanks including double bottom tanks, wing tanks as well as forepeak and aftpeak tanks. Adding ballast to a vessel lowers its center of gravity, and increases the draft of the vessel. Increased draft may be required for proper propeller immersion.
A ballast tank can be filled or emptied in order to adjust the amount of ballast force. Ships designed for carrying large amounts of cargo must take on ballast water for proper stability when travelling with light loads and discharge water when heavily laden with cargo. Small sailboats designed to be light weight for being pulled behind automobiles on trailers are often designed with ballast tanks that can be emptied when the boat is removed from the water.
Read more about this topic: Ballast Tank
Famous quotes containing the word ships:
“The northern sky rose high and black
Over the proud unfruitful sea,
East and west the ships came back
Happily or unhappily....”
—Philip Larkin (1922–1986)
“Give blue-eyed men their swivel chairs
To whirl in tall buildings.
Allow them many ships at sea,
And on land, soldiers
And policemen.”
—Arna Bontemps (1902–1973)
“Haven’t you heard, though,
About the ships where war has found them out
At sea, about the towns where war has come
Through opening clouds at night with droning speed
Further o’erhead than all but stars and angels
And children in the ships and in the towns?”
—Robert Frost (1874–1963)