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When an incompressible buoyancy compensator is used, almost all of the variable volume is in the diving suit, and the depth range of effectively neutral buoyancy is maximised. A diver without a diving suit would be effectively neutrally buoyant over the full depth range of the dive, and only need to adjust buoyancy for mass loss as gas is used.
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.
Added buoyancy due to the volume of the suit is a side effect of most diving suits. A diving weighting system can be worn to counteract this buoyancy. Overalls may be worn over the diving suit as additional protection against cuts and abrasion. This is more usual for professional divers.
Diving suits are worn for protection from the environment. In most cases this is to keep the diver warm, as heat loss to water is rapid. There is a trade-off between insulation, comfort, and mobility. When diving in the presence of hazardous materials, the diving suit also serves as personal protective equipment to limit exposure to those ...
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.
This equipment includes buoyancy control equipment and mobility equipment: Buoyancy control is achieved by ballasting with diving weights and compensating for buoyancy changes during the dive using a buoyancy compensator: Diving weighting system - to counteract the buoyancy of the diving suit and diver to allow descent. Professional divers may ...