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Two U.S. Marines of the Maritime Special Purpose Force operating a Diver Propulsion Device (DPD). A diver propulsion vehicle (DPV), also known as an underwater propulsion vehicle, sea scooter, [1] underwater scooter, or swimmer delivery vehicle (SDV) by armed forces, is an item of diving equipment used by scuba divers to increase range underwater.
The main gas supply for surface-supplied diving can be from high pressure bulk storage cylinders. When the storage cylinders are relatively portable this is known as a scuba replacement system in the commercial diving industry. The application is versatile and can ensure high quality breathing gas in places where atmospheric air is too ...
The diving equipment used is basic surface-supplied diving equipment with voice communications, fitted with welding shields that can be hinged down over the faceplate to protect the diver's vision. Suitable heavy duty rubber gloves and overalls may be used in addition to a diving suit appropriate to the general underwater conditions. [ 1 ] :
Founded in 1949 by Ludovico Mares in Rapallo, Italy, the company initially made diving masks and spearguns. It has since expanded to become one of the largest scuba manufacturers, having merged with US manufacturer Dacor. [1]
Velvia 100 (RVP 100) was introduced in 2005, to replace the discontinued original Velvia (RVP). [5] The color rendition of Velvia 100 was designed to record all colors even more accurately. [ citation needed ] Reciprocity failure was reduced for long exposures and dye stability extended.
The aluminium alloys used for diving cylinders are 6061 and 6351. 6351 alloy is subject to sustained load cracking and cylinders manufactured of this alloy should be periodically eddy current tested according to national legislation and manufacturer's recommendations.
A diving regulator or underwater diving regulator is a pressure regulator that controls the pressure of breathing gas for underwater diving.The most commonly recognised application is to reduce pressurized breathing gas to ambient pressure and deliver it to the diver, but there are also other types of gas pressure regulator used for diving applications.
Face sealed manifolded twin 12l steel cylinder set. A scuba manifold is a device incorporating one or more valves and one or more gas outlets with scuba regulator connections, used to connect two or more diving cylinders containing breathing gas, providing a greater amount of gas for longer dive times or deeper dives.