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Ballasting or cleaning of fuel oil tanks; Discharge of ballast containing an oily mixture or cleaning water from fuel oil tanks; Disposal of oil residue; and; Discharge overboard or disposal otherwise of bilge water that has accumulated in machinery spaces.
Minimise the uptake of organisms during ballasting. Minimising the uptake of sediments during ballasting. Ballast water exchange while at sea (the ship should be minimum 200 nautical miles from shore with a depth of minimum 200 metres and can use the flow through or sequential method).
The partial failure of the emergency main ballast tank blow system contributed to the loss of USS Thresher in 1963. It was caused by icing of strainers in the air lines due to "the high volume of air moving past the strainers at such high velocity [which] would have caused them to cool rapidly."
Closeup of the undercutting bar and results on a Plasser & Theurer ballast cleaner in use in Hungary in 2009. A cutter bar runs beneath sleeper level excavating all of the ballast under the sleepers to a specified, variable depth.
Cross section of a vessel with a single ballast tank at the bottom. Ballast is dense material used as a weight to provide stability to a vehicle or structure. Ballast, other than cargo, may be placed in a vehicle, often a ship or the gondola of a balloon or airship, to provide stability.
Because of the growing problem of introduction of invasive species into U.S. waters via ballast water, in January 1999, a number of conservation organizations, fishing groups, native American tribes, and water agencies petitioned EPA to repeal its 1973 regulation exempting ballast water discharge under the Clean Water Act (CWA).
The simplest form of ballast used in small day sailers is so-called "live ballast", or the weight of the crew. By sitting on the windward side of the hull, the heeling moment must lift the weight of the crew.
Cross section of a vessel with a single ballast tank at the bottom. A ballast tank is a compartment within a boat, ship or other floating structure that holds water, which is used as ballast to provide hydrostatic stability for a vessel, to reduce or control buoyancy, as in a submarine, to correct trim or list, to provide a more even load distribution along the hull to reduce structural ...