Water carried in designated ballast water tanks (segregated tanks) or cargo tanks (non-segregated tanks) to control draft, trim, stresses, and stability
water carried in special tanks (ballast tanks) of ships for insuring proper stability, especially needed when carrying less than a full load of freight. Ballast water pumped into the ballast tanks in a freshwater port could carry freshwater organisms to a new port if pumped out when a new cargo is loaded. This is the mechanism by which it is believed that zebra mussels were carried to North America. Ocean-going ships entering North America are now required to exchange freshwater ballast for ocean water to prevent introductions of other exotic organisms by this means.
is water (which often contains aquatic life) that is pumped on board a ship or vessel to ensure stability and balance during a voyage. It may be discharged untreated at points all across the globe.
Water that is used to stabilize large transporter ships and is discharged at various points on their routes; the water typically contains a variety of species which become invasive species when discharged into non-native waters.
water taken up or released by a ship to stabilize it, or to raise/lower it in the water column
water pumped into the bottom of a ship to ensure its stability, especially in rough seas.
water carried in special tanks (ballast tanks) of ships used to provide stability needed when carrying less than a full load of cargo and to keep the ship at the proper depth in the water. When the ship is loaded with cargo, the ballast water is released to surrounding waters; when the ship is empty, it takes on more water to keep it upright. Some vessels use sand as ballast rather than water.
The water from the hold of big ships, used to keep the ship from tilting in big waves and wind.
water carried in vessel tanks for stability. • dirty ballast: ballast water that contains residual oil. When seawater is introduced into empty cargo tanks, residual oil mixes with the water and requires special handling at sea or treatment at a specialized facility before being discharged into the sea. Dirty ballast consists of seawater contaminated with approximately 1% crude oil. • clean ballast: ballast water that is essentially free from oil. Does not exceed 15 ppm total recoverable oil and grease (TROG) and does not exceed 15 ppb benzene, toluene, ethylbenzene, and xylene (BTEX). • segregated ballast: ballast water that is in tanks designed and used exclusively for that purpose.
Water carried by a vessel to improve its stability.
water carried in tanks to maintain stability when a ship is lightly loaded; normally discharged to the sea when the ship is loaded with cargo
fresh or salt water (sometimes containing sediments) held in tanks and cargo holds of ships to increase stability and maneuverability during transit
Water used by large ships to maintain stability when not carrying cargo
Water carried by a vessel to improve stability, or the act of adding such weight.
