Search results
Results from the WOW.Com Content Network
A cargo ship discharging ballast water into the sea. Diagram showing the water pollution of the seas from untreated ballast water discharges. Ballast water discharges by ships can have a negative impact on the marine environment. The discharge of ballast water and sediments by ships is governed globally under the Ballast Water Management ...
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 ...
Many systems allow the PIC to monitor the ballast system and ship's stability during load and discharge. Cargo control rooms began to appear on U.S.-flag tankers in the mid-1960s. [3] Prior to this time, valves were operated manually on deck by reach rods and liquid levels were monitored by a roving watch consisting of the mate and seamen on ...
An oil tanker's inert gas system is one of the most important parts of its design. [18] Fuel oil itself is very difficult to ignite, however its hydrocarbon vapors are explosive when mixed with air in certain concentrations. [19] The purpose of the system is to create an atmosphere inside tanks in which the hydrocarbon oil vapors cannot burn. [18]
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 of the ballast tanks. During peacetime the Kingston valves are closed when the submarine is on the surface, the valves and vents being ...
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. A compartment within a boat, ship, submarine, or other floating structure that holds water is called a ballast tank. Water ...
The position of the summer load line is calculated from the load line rules and depends on many factors such as length of ship, type of ship, type and number of superstructures, amount of sheer, and bow height. The horizontal line through the circle of the Plimsoll mark is at the same level as the summer load line.
As double-hulled tankers were introduced it meant that there was more ballast tank area had to be coated and therefore a greater capital investment for ship owners. With the onset of the OPA 90 and later the amendments to MARPOL annex 1, single hull tankers (without alternative method) have basically phased out.