ballasting


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Related to ballasting: Ship in ballast

bal·last

 (băl′əst)
n.
1. Heavy material that is carried to improve stability or maintain proper trim, as on a ship, or to limit buoyancy, as on a balloon.
2.
a. Coarse gravel or crushed rock laid to form a bed for roads or railroads.
b. The gravel ingredient of concrete.
3. Something that gives stability, especially in character.
tr.v. bal·last·ed, bal·last·ing, bal·lasts
1. To stabilize or provide with ballast.
2. To fill (a railroad bed) with or as if with ballast.

[Perhaps from Old Swedish or Old Danish barlast : bar, mere, bare; see bhoso- in Indo-European roots + last, load.]
References in periodicals archive ?
To apply the ballast-free concept to this vessel design, HMD gave careful consideration to the special hull form with dead-rise; forward engine room and deckhouse and a twin propulsion system with azimuth thrusters so that the vessel can retain its damage stability and easily control the trim and heel without ballasting.
Under the best circumstances, screen filtration would require large ships to install expensive equipment to keep up with their ballasting rates of several thousand tons per hour.