Types of Hazards - Ohio Bureau of Workers' Compensation

Types of Hazards - Ohio Bureau of Workers' Compensation

Respirator types Respirators From the preamble to the revision of 1910.134: In principle, respirators frequently may be capable of providing adequate protection. However, problems associated with selection, fit, and use often render them ineffective in actual application, preventing the assurance of consistent and reliable protection, regardless of the theoretical capabilities of the respirator.

A little respirator history. . . .

In Roman mines they used loose-fitting animal bladders to try to filter out lead 1814: development of a particulate removing filter in a rigid container 1854: discovery that activated charcoal could be used to capture some vapors WWI: improvements in full face gas masks 1930: the development of resin impregnated dust filters permitted cheaper, improved units 1940s: SCBA developed from SCUBA concept Types of Respirators R e s p ira to rs

A ir P u rify in g N e g a tiv e P re s s u re P o w e re d A ir P u rify in g A ir S u p p ly in g A irlin e SCBA

Types of Respirators Air-Purifying: cleans air* cant add oxygen *maybe Air- Purifying Respirators removes particulate, or

removes vapor & gas, or combination of the above Air- Purifying Respirators particulates: filters

gases or vapors: chemical cartridges or chemical canisters Types of Respirators Air-Supplying: supply a clean* source of air *maybe Air- Purifying Respirators

Negative pressure user draws in air through a filter or cartridge creates a negative pressure Powered air-purifying (PAPR) battery powered pump draws in air through a filter provides positive pressure to user Air-Supplying Respirators

Airline air is supplied to facepiece via air line from either a compressor, a large cylinder or cascade system SCBA air is supplied via short air line from a user-worn cylinder (thus, selfcontained) Airline with escape bottle combo unit

SCBA escape only units Operation modes: See tab3-3 Demand mode Positive pressure mode

Pressure-demand mode Operation modes: Demand mode: air enters facepiece only when wearer creates negative pressure Positive pressure mode Pressure-demand mode

Operation modes: Demand mode Positive pressure mode: facepiece is constantly positively pressurized (compared to air outside the facepiece) by a constant flow Pressure-demand mode

Operation modes: Demand mode Positive pressure mode Pressure-demand mode: facepiece is always positively pressurized but flow changes according to demand from user

Types of Facepieces Tight-fitting: requires seal on face (thus no facial hair); air-purifying or air-supplying Loose-fitting: no seal on face; airline only (but not airline with escape bottle)

Tight-fitting facepieces Full face: hairline to below chin (covers nose, mouth & eyes) Half face: nose & mouth, & seals under chin

Quarter face: nose & mouth, but seals between mouth & chin Loose-fitting facepieces Hood: device covering head & neck Helmet: gives impact & penetration protection

variations; above with: Blouses (covers shoulders) or Full suits TC approval schedules:

TC-13F-XXXX TC-14G-XXXX TC-19C-XXXX TC-21C-XXXX TC-23C-XXXX TC-84A-XXXX SCBA gas masks air supply DFM (term out-dated) chemical cartridge non-powered APR

(under 84)

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