Laboratory Evaluation of Particle Entrainment from Regenerative Canisters of the Draeger Self Contained Oxygen Breathing Apparatus Model BG174-A.
NIOSH 1981 Jul:11 pages
A laboratory investigation was conducted of the Draeger closed circuit self contained breathing apparatus (SCBA). The investigation was requested by the New York City Fire Department Fire Academy (SIC-9224), in response to complaints by firefighters of throat irritation when using the apparatus. The investigation was conducted to determine if particulates from the SCBA stock alkali regenerative canisters had the potential to enter the breathing circuit of the unit when used at a moderate work rate. A test unit was constructed for evaluation that consisted of the alkali canister, a connecting socket, an in line air filter, inhalation and exhalation valves, and a breathing machine, all connected with lengths of tubing. A humidification system was entrained to the front end of the test unit to test for relative humidity. Particulates fell from the opening of the outlet of the alkali canisters. Concentrations of particulates that penetrated the breathing circuit ranged from 0.2 to 119.3 milligrams per cubic meter (mg/m3) for the regenerative canister tested with alkali particulates ranging from 0.2 to 93.62mg/m3 of air in the breathing circuit. There was a high potential for sodium-hydroxide (1310732), potassium-hydroxide (1310583), and calcium-hydroxide (1305620) particles that exceeded occupational health criteria. The authors conclude that alkali particles enter the breathing circuit of the SCBA and may subsequently enter the respiratory system of the user.
NIOSH-Author; Safety-research; Clinical-techniques; Physiological-measurements; Pulmonary-function-tests; Respiratory-system-disorders; Medical-research; Health-hazards; Emergency-equipment; Hospital-equipment; Respirators
1310-73-2; 1310-58-3; 1305-62-0
Task Order Report
NTIS Accession No.
Division of Safety Research, NIOSH, Morgantown, West Virginia, Task No. 00806, PB-83-245-100, 11 pages, 7 references