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Halcyon Dive Systems – American manufacturer of diving equipment Rebreathers, dive lights, regulators, buoyancy compensators. [63] L.G. Hammond, Miami. FLA – Shallow water helmets [64] Hardsuits international. Hardsuit atmospheric diving suit. Healthways (scuba gear company) – Defunct firm which made scuba gear.
This requires the diver to be negatively buoyant by the total mass of gas carried at the start of the dive with an empty buoyancy compensator, so the buoyancy compensator must have sufficient volume to neutralise this excess and any further loss of buoyancy in the diving suit during the descent.
Standard diving dress, also known as hard-hat or copper hat equipment, deep sea diving suit or heavy gear, is a type of diving suit that was formerly used for all relatively deep underwater work that required more than breath-hold duration, which included marine salvage, civil engineering, pearl shell diving and other commercial diving work, and similar naval diving applications.
During the dive, buoyancy is controlled by adjusting the volume of air in the buoyancy compensation device (BCD) and, if worn, the dry suit, in order to achieve negative, neutral, or positive buoyancy as needed. The amount of weight required is determined by the maximum overall positive buoyancy of the fully equipped but unweighted diver ...
The buoyancy compensator is used by ambient pressure divers using underwater breathing apparatus to adjust buoyancy underwater or at the surface within the range of slightly negative to slightly positive, to allow neutral buoyancy to be maintained throughout the depth range of the planned dive, and to compensate for changes in weight due to breathing gas consumption during the dive.
The Avelo diving system is a single cylinder, back-mounted scuba set with variable density buoyancy control. The gas cylinder is a carbon fibre over aluminium liner filament wound pressure vessel with a charging pressure of 300 bar and a gas capacity of about 106 cubic feet of atmospheric pressure air or recreational nitrox .