Modifications and Testing of Mark 10 Mod 4 Closed Circuit Breathing Apparatus.
NAVY EXPERIMENTAL DIVING UNIT PANAMA CITY FLA
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As a result of extreme respiratory difficulty experienced at 1000 ft., a breathing resistance study was performed to identify the problem area. A breathing resitancy of 22 centimeters of H2O inhale and 48 centimeters of H2O exhale at a depth of 1000 FSWfeet sea water using 0.4 PO2 with a breathing rate of 37 breaths per minute was measured. Upon completion of gas passage modifications, the breathing resistance was reduced to 11 cm. H2O exhale at a depth of 1000 FSW using 0.4 PO2 at a breathing rate of 37 breaths per minute. As a culmination of the tests and modifications, during NAVXDIVINGUs 1600 ft working dive, breathing resistance was measured on a diver using a Mark 10 Mod 4 as modified, to be 12 cm. inhale and 15 cm. exhale at a breathing rate of 23 breaths per minute.
- Stress Physiology
- Life Support Systems