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2. Diving cylinder - Wikipedia

   en.wikipedia.org/wiki/Diving_cylinder

   The pressure vessel is a seamless cylinder normally made of cold-extruded aluminum or forged steel. [5] Filament wound composite cylinders are used in fire fighting breathing apparatus and oxygen first aid equipment because of their low weight, but are rarely used for diving, due to their high positive buoyancy.

3. History of scuba diving - Wikipedia

   en.wikipedia.org/wiki/History_of_scuba_diving

   A scuba set is characterized by full independence from the surface during use, by providing breathing gas carried by the diver. Early attempts to reach this autonomy were made in the 18th century by the Englishman John Lethbridge, who invented and successfully built his own underwater diving machine in 1715, but though the air supply was carried in the diving apparatus, it relied on surface ...

4. Worthington Enterprises - Wikipedia

   en.wikipedia.org/wiki/Worthington_Enterprises

   Worthington Enterprises is the parent company of consumer brands including Balloon Time helium tanks, Bernzomatic, Garden Weasel, General, HALO, Hawkeye, Level5 Tools, Mag-Torch, Pactool International and more. Worthington Enterprises is the only manufacturer of disposable 1lb propane cylinders in North America, which are sold under the ...

5. Testing and inspection of diving cylinders - Wikipedia

   en.wikipedia.org/wiki/Testing_and_inspection_of...

   Blowdown silencer for emptying scuba cylinders Before internal inspection the valve must be removed after depressurising and verifying that the valve is open. Cylinders containing breathing gases do not need special precautions for discharge except that high oxygen fraction gases should not be released in an enclosed space because of the fire ...

6. Diving weighting system - Wikipedia

   en.wikipedia.org/wiki/Diving_weighting_system

   Steel diving cylinders are preferred over aluminium cylinders by some divers—particularly cold water divers who must wear a suit that increases their overall buoyancy—because of their negative buoyancy. Most steel tanks stay negatively buoyant even when empty, aluminium tanks may become positively buoyant as the gas they contain is used.

7. Scuba manifold - Wikipedia

   en.wikipedia.org/wiki/Scuba_manifold

   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.