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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 ...
Most newer tankers are double-hulled, with an extra space between the hull and the storage tanks. [4] Hybrid designs such as double-bottom and double-sided combine aspects of single and double-hull designs. [4] All single-hulled tankers have been phased out as of 2015, in accordance with amendments to Annex I of the MARPOL Convention. [4]
The total capacity of the main and double bottom tanks was 2,342,500 and 382,000 gallons, respectively. [3] The pump room was located amidships and contained both main cargo pump, and an auxiliary ballast pump that could have been used to handle oil cargo independently of the main pump. [ 3 ]
Single hull, Double bottom, and Double hull ship cross sections. Green lines are watertight; black structure is not watertight. A double hull is a ship hull design and construction method where the bottom and sides of the ship have two complete layers of watertight hull surface: one outer layer forming the normal hull of the ship, and a second inner hull which is some distance inboard ...
The upper and lower corners of the hold are used as ballast tanks, as is the double bottom area. The corner tanks are reinforced and serve another purpose besides controlling the ship's trim. Designers choose the angle of the corner tanks to be less than that of the angle of repose of the anticipated cargoes. [14]
A ballast tank has three distinct sections: 1) upper, 2) mid or "boottop" area and, 3) the "double bottom" or lower wing sections. The upper regions are constantly affected by weather. This area experiences a high degree of thermal cycling and mechanical damage through vibration.
The hull was entirely steel with a double bottom extending almost 365 ft (111.3 m) containing water ballast and divided lengthwise with a watertight bulkhead and by transverse bulkheads into fourteen compartments. [3]
She had double bottom ballast tanks, two watertight bulkheads, a steel boilerhouse, two decks, cabins capable of accommodating up to 50 passengers, six cargo hatches and originally one, later two mast(s).
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