By Carl Edmonds, Bart McKenzie, Robert Thomas
Diving drugs bargains with clinical learn on problems with diving, the prevention of diving issues, remedy of diving injuries and diving health.
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5. In a fatality survey on buddied divers who experienced a low-on-air or out-of-air (LOA/OOA) situation, it was of interest that irrespective of who became OOA first, the over-weighted diver was the one who died – at a 6:1 ratio. 6. Based on the formula below, 40% of divers who perished were found to be grossly overweighted at the surface.
Some systems developed in Europe improve endurance by utilising cylinder pressures of approximately 300 Bar (4500 psi). New cylinders manufactured from alloy-mix materials permit greater pressures, and are smaller and lighter. In most countries, laws require that all cylinders are visually and hydrostatically tested every 1–2 years. A cylinder valve fitted with a mechanical tap and connecting fitting is threaded into the neck of the cylinder. Standards require the fitting of a "burst-disc" to this valve so that this will burst before the cylinder in the event of overpressure.
Fig. 17 A modern professional diving mask in rear with Standard Dress helmet in the foreground. Chapter 5 — 15 Closed and Semi-closed Circuit REBREATHING APPARATUS With this equipment some or all of the diver's exhaled gas is passed through a carbon dioxide absorber ("scrubber") and then rebreathed from a breathing bag ("counterlung"). This minimises gas usage, produces fewer bubbles and allows smaller cylinders to be used for an equivalent dive duration. Fig. 18 Diagram of two types of closed circuit oxygen rebreathing sets.
Diving Medicine for SCUBA Divers by Carl Edmonds, Bart McKenzie, Robert Thomas