An air-supplied respirator for underground coal miners.
Crooks TP; Stawitcke FA; Tobey S; De Cola CR
Morgantown, WV: U.S. Department of Health, Education, and Welfare, Public Health Service, Health Services and Mental Health Administration, National Institute for Occupational Safety and Health, TR-047-73, 1973 Jun; :1-194
A new type air-supplied respirator for use by underground coal miners intended to improve wearer acceptance was developed. The respirator system employs a machine-mounted hydraulic powered air compressor and filter system. Maintenance requirements were reduced to a minimum through the use of cyclone (centrifugal separator) prefilters. A new facepiece design was also developed to achieve increased acceptance by the user. It incorporates a pair of miniature, high performance, low inhalation resistance demand regulators, mounted directly on the facepiece to reduce breathing effort. A small continuous air flow is provided to reduce thermal burden and required seal pressures. A special consideration was given to the harsh requirements imposed on powered respirator systems by the underground coal mine environment. Both manned and unmanned tests of system performance and acceptability in simulated mine environments were conducted.
Coal-mining; Coal-miners; Respirators; Respiratory-equipment; Air-flow
Final Contract Report
NTIS Accession No.
National Institute for Occupational Safety and Health
Synsis Inc., Los Angeles, CA