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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.
The devices can be expensive to acquire and maintain, but are quite valuable because they reduce the need for large water tanks for a long passage. The term watermaker may also refer to an atmospheric water generator , a machine that extracts potable water from the humidity in air using a refrigeration or a desiccant .
Boat suspended from Welin Quadrant davits; the boat is mechanically 'swung out' HMS Victory in the 19th century, showing her boats suspended from wooden davits Gravity multi-pivot on cruiseferry Scandinavia Gravity Roller Davit Gravity multi-pivot davit holding rescue vessel on North Sea ferry Freefall lifeboat on the Spring Aeolian Frapping line Labeled Tricing Gripe Steps to launch davit ...
The holding tank can be safely emptied at a dump station. Greywater holding tanks can also be emptied at a dump station. Dump stations are often located at campgrounds , RV parks , truck stops , RV storage facilities, highway rest areas, recreation vehicle dealerships, marinas and other places that are frequented by recreational vehicles and boats.
A portable boat lift is not a boat lift which is commonly found attached to a dock. Although some devices allow one person to separate a boat from a trailer or lift a boat up and out of the water, they are not by definition portable. The term "boat lift" originally referred to lift locks. In modern usage the term "boat lift," as opposed to ...
The mechanical arrangement may be a ducted propeller (axial-flow pump), a centrifugal pump, or a mixed flow pump which is a combination of both centrifugal and axial designs. The design also incorporates an intake to provide water to the pump and a nozzle to direct the flow of water out of the pump. [1]
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