Accession Number : ADA140673

Title :   Purging Procedures for the Draeger LAR V Underwater Breathing Apparatus.

Descriptive Note : Final rept.,

Corporate Author : NAVY EXPERIMENTAL DIVING UNIT PANAMA CITY FL

Personal Author(s) : Butler,F K , Jr ; Thalmann,E D

PDF Url : ADA140673

Report Date : Mar 1984

Pagination or Media Count : 24

Abstract : The U.S. Naval SEAL teams currently utilize the Draeger LAR V closed-circuit oxygen Underwater Breathing Apparatus (UBA) for clandestine combat swimmer operations. Prior to beginning a dive with a closed-circuit oxygen UBA, a purge procedure is carried out to remove inert gas (nitrogen) from the breathing mixture. This study seeks to establish an optimal purging procedure for the Draeger LAR V. Twenty-four purges were conducted using the current Standard three fill/empty cycle purge procedure; the average oxygen percentage obtained in the breathing mix was 85% with a high of 96% and a low of 73%. Fifty-four Single Fill/Empty Cycle (SFE) purge procedures resulted in an average oxygen percentage of 74% with a high of 89% and a low of 50%. Forty No Fill/Empty Cycle (NFE) purge procedures resulted in an average oxygen percentage of 55% with a high of 82% and a low of 20%. Eighteen 2-hour dives using the two experimental purge procedures showed no significant inert gas buildup during the course of the dive.

Descriptors :   *Breathing apparatus, *Underwater equipment, *Purging, Removal, Nitrogen, Oxygen, Concentration(Chemistry), Methodology, Efficiency, Breathing gases, Mixtures, Diving, Covert operations, Naval operations, Swimmers, Warfare

Subject Categories : Logistics, Military Facilities and Supplies
      Life Support Systems

Distribution Statement : APPROVED FOR PUBLIC RELEASE