Accession Number : ADA017750

Title :   Modifications and Testing of Mark 10 Mod 4 Closed Circuit Breathing Apparatus.

Descriptive Note : Final rept.,


Personal Author(s) : Cetta,Thomas W. ; Radecki,R.

Report Date : SEP 1975

Pagination or Media Count : 17

Abstract : 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 FSW(feet 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 NAVXDIVINGU's 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.

Descriptors :   *Breathing apparatus, *Diver equipment, *Pressure breathing, Decompression, Ventilation(Physiology), Modification, Performance(Engineering)

Subject Categories : Stress Physiology
      Life Support Systems

Distribution Statement : APPROVED FOR PUBLIC RELEASE