Proposed Standards for the Evaluation of the Breathing Resistance of Underwater Breathing Apparatus.
NAVY EXPERIMENTAL DIVING UNIT WASHINGTON D C
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A set of definitive engineering-oriented respiratory impedance standards are proposed for use in the depth range 0 to 1000 fsw. The standard are consistent with current medical knowledge and are simply stated so that they may be easily applied. The test conditions under which the standards are to be applied are also specified in detail. Basically, the prepared standards require that the external respiratory work which a diver can be required to do on his breathing apparatus, as measured by mouthpiece conditions, must be less than 0.17 kilogram-meter of work per liter ventilation. The reference pressure to be used in calculating the external respiratory work is identified as the hydrostatic pressure at the level of the 7th cervical vertebra for all types of diving equipment except open circuit SCUBA regulators. Modified author abstract
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