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  2. Ship ballast - Wikipedia

    en.wikipedia.org/wiki/Ship_ballast

    The advantage of water ballast is that the tanks can be emptied, reducing draft or the weight of the boat (e.g. for transport on ground) and water added back in (in small boats, simply by opening up the valves and letting the water flow in) after the boat is launched or cargo unloaded.

  3. Ballast tank - Wikipedia

    en.wikipedia.org/wiki/Ballast_tank

    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 ...

  4. Ballast - Wikipedia

    en.wikipedia.org/wiki/Ballast

    A compartment within a boat, ship, submarine, or other floating structure that holds water is called a ballast tank. Water should be moved in and out from the ballast tank to balance the ship. Water should be moved in and out from the ballast tank to balance the ship.

  5. Spar (platform) - Wikipedia

    en.wikipedia.org/wiki/Spar_(platform)

    A spar is a marine structure, used for floating oil/gas platforms. Named after navigation channel Spar buoys, spar platforms were developed as an extreme deepwater alternative to conventional platforms. [1] The deep draft design of spars makes them less affected by wind, wave, and currents and allows for both dry tree and subsea production.

  6. Displacement (ship) - Wikipedia

    en.wikipedia.org/wiki/Displacement_(ship)

    Light displacement (LDT) is defined as the weight of the ship excluding cargo, fuel, water, ballast, stores, passengers, crew, but with water in boilers to steaming level. [ 8 ] Normal displacement

  7. Stability conditions - Wikipedia

    en.wikipedia.org/wiki/Stability_conditions

    Lightship or Light Displacement [ edit ] The vessel is complete and ready for service in every respect, including permanent ballast , spare parts, lubricating oil, and working stores but is without fuel, cargo, drinking or washing water, officers, crew, passengers, their effects, temporary ballast or any other variable load.

  8. Electrical ballast - Wikipedia

    en.wikipedia.org/wiki/Electrical_ballast

    [1] [3] To prevent this, fluorescent tubes are connected to the power line through a ballast. The ballast adds positive impedance (AC resistance) to the circuit to counteract the negative resistance of the tube, limiting the current. [1] Several American magnetic ballasts for fluorescent lamps. The top is a rapid start series autoregulator ...

  9. Variable-buoyancy pressure vessel - Wikipedia

    en.wikipedia.org/wiki/Variable-buoyancy_pressure...

    A variable-buoyancy pressure vessel system is a type of rigid buoyancy control device for diving systems that retains a constant volume and varies its density by changing the weight (mass) of the contents, either by moving the ambient fluid into and out of a rigid pressure vessel, or by moving a stored liquid between internal and external variable-volume containers.

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