Lighter compact respirators for toxic vapor protection.
Brown-CE; Kalumuck-KM; Chahine-GL; Frederick-GS
Dynaflow, Inc., Fulton, Maryland, Report No. 92003-1 1993 Jun; :1-38
An attempt was made to reduce the size and weight of the canisters or elements in a respirator that remove the toxic vapors from the breathed air. The system studied involved substitution of the usual activated charcoal absorbent and its required valving with a specially selected and configured polymer absorbent material combined with bidirectional flow through the porous bed. Experiments were conducted with a high boiling point vapor typical of many toxic vapors found in industrial work places. An experimental loop which simulated the human breathing cycle was designed and constructed and a polymer absorbent test module with many fine air passage channels that simulated a section of the novel respirator was cast and used in the experimental loop. When two way oscillatory flow was compared with one way flow, a dramatic increase in breakthrough time and a decrease in the concentration after breakthrough were seen with two way flow. A parametric study conducted with a numerical simulation model indicated that using of the two way oscillating flow with polymer absorbents to substantially increase the breakthrough time for toxic vapors was feasible.
NIOSH-Grant; Adsorbents; Respirators; Respiratory-protective-equipment; Personal-protective-equipment; Toxic-vapors; Filter-materials
Dynaflow Inc 7210 Pindell School RD Fulton, MD 20759
Final Grant Report
NTIS Accession No.
Dynaflow, Inc., Fulton, Maryland, Report No. 92003-1
Dynaflow, Inc., Fulton, Maryland