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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 ...
USS Columbus (SSN 762) performing an emergency ballast blow. An emergency main ballast tank blow is a procedure used aboard a submarine that forces high-pressure air into its main ballast tanks. The high-pressure air forces ballast water from the tanks, quickly lightening the ship so it can rapidly rise to the surface.
Early submarine cross-section, before saddle tanks. The first effective submarines, those of World War I, had hulls that were broadly circular in cross-section, with a deck plate mounted midway. Their heavy battery tanks were mounted beneath this deck, for stability. The ballast tanks were mounted inside the pressure hull.
USS Pittsburgh demonstrates an emergency main ballast tank blow in 1991. Pittsburgh was officially deactivated on 17 January 2020 at the Undersea Warfare Museum in Keyport, Washington, and awaited the Submarine Recycling Program at Puget Sound Naval Shipyard in Bremerton, Washington. She was later decommissioned on 15 April 2020 and the crew ...
Von Steuben had conducted an emergency main ballast tank blow due to its planes tangled in the submerged towline of the tug, jamming them so that the sub threatened to sink. Greenville blew her main ballast tanks merely to demonstrate a maneuver and not to escape from danger. Her captain consciously surrendered control of the vessel.
The inability to blow the ballast tanks was later attributed to excessive moisture in the submarine's high-pressure air flasks, moisture that froze and plugged the flasks' flowpaths while passing through the valves. This was later simulated in dockside tests on Thresher ' s sister sub, Tinosa.
On vintage submarines, Kingston valves are fitted at the bottom of certain ballast tanks, such as safety, negative, and bow buoyancy tanks. The submarine's ballast tank valves are used to admit water when the submarine dives. The valves allow water to enter the ballast tanks, while the enclosed air escapes through the open main vents at the top ...
The vents of the Redoutable are under the casing. The square openings in the casing are limber holes to facilitate draining the superstructure. In submarine technology a vent is a valve fitted to the top of a submarine's ballast tanks to let air escape from the top of the ballast tank and be replaced by water entering through the opening(s) called "flood ports" or "floods" at the bottom of the ...