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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 ...
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.
6,500 m (21,300 ft) Capacity. 680 kg (1,500 lb) payload. Crew. 3 (1 pilot, 2 scientific observers) Alvin (DSV-2) is a crewed deep-ocean research submersible owned by the United States Navy and operated by the Woods Hole Oceanographic Institution (WHOI) of Woods Hole, Massachusetts. The original vehicle was built by General Mills ' Electronics ...
An 80 US gal (300 L; 67 imp gal) electric storage tank water heater was able to have a minimum energy factor of 86% under the pre-2015 standard, while under the 2015 standard, the minimum energy factor for an 80-gallon electric storage tank water heater is now 197%, which is only possible with heat pump technology. This rating measures ...
CSS David operated as a semi-submersible: water was taken into ballast tanks so that only the length of the open-top conning tower and the stack for the boiler appeared above water. [2] Designed to operate very low in the water, David resembled in general a submersible submarine ; she was, however, strictly a surface vessel. [ 1 ]
Retired modern submersible Star III of Scripps Institution of Oceanography. A submersible is an underwater vehicle which needs to be transported and supported by a larger watercraft or platform. This distinguishes submersibles from submarines, which are self-supporting and capable of prolonged independent operation at sea.
The Imperial Russian Navy developed semi-submersible vessels—starting with the Keta [ru] —which were designed to be torpedo boats with low visibility for coastal protection against enemy warships. Keta was built in 1904 in St. Petersburg, powered by a 14-horsepower (10 kW) motor, displacing 8 tons, and with a length of 7 metres (23 ft).
Within 30 minutes, a different, non-nuclear civilian construction group began an assignment to bring Guitarro within a half-degree of trim; this entailed adding water to the forward ballast tanks to overcome a reported two-degree up-bow attitude. Until shortly before 20:00, both groups continued to add water, unaware of each other's activities. [1]
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