Performance Evaluation of Two Closed-Circuit Breathing Apparatus For Use in Chemically Toxic Environments
Abstract
Two closed-circuit breathing apparatus (BioPak 240, Rexnord Breathing Systems, Inc. and BG-174, national Draeger, Inc.) were evaluated to determine the most suitable system to the be used with the self-contained toxicological environmental protection outfit (STEPO) currently under development. Separate tests were conducted to determine differences in the physiological encumbrance and protection levels of the two systems. The physiological evaluation protocol consisted of alternating 15-min periods of rest and exercise (4.0 kph, 0% grade) on a motor driven treadmill for 2 hr. A totally encapsulating butyl rubber suit similar to that being developed for STEPO was worn in these tests. Measurements included heart rate, minute ventilation, suit temperature, oxygen concentration, carbon dioxide concentration, water vapor pressure, and temperature. Test results indicated that neither system had substantial advantages over the other with regard to the physiological burden imposed on the user. Protection evaluations were conducted in a corn oil aerosol test chamber. The BioPak 240 (a positive pressure system) provided significantly higher levels of protection than the BG-174. Based on this result, the BioPak 240 is levels of protection than the BG-174. Based on this result, the BioPak 240 is recommended as the most suitable candidate for use in STEPO.
Document Details
- Document Type
- Technical Report
- Publication Date
- Apr 01, 1989
- Accession Number
- ADA207313
Entities
People
- Linda L. Moss
- Paul D. Gardner
- Randolph G. Laye
- Wade D. Kuhlmann
Organizations
- Edgewood Chemical Biological Center