Respirator types

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  • Respirator types

  • RespiratorsFrom 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 lead1814: development of a particulate removing filter in a rigid container1854: discovery that activated charcoal could be used to capture some vaporsWWI: improvements in full face gas masks1930: the development of resin impregnated dust filters permitted cheaper, improved units1940s: SCBA developed from SCUBA concept

  • Types of Respirators

  • Types of RespiratorsAir-Purifying:

    cleans air*cant add oxygen

    *maybe

  • Air- Purifying Respiratorsremoves particulate, or removes vapor & gas, or combination of the above

  • Air- Purifying Respiratorsparticulates: filtersgases or vapors: chemical cartridges or chemical canisters

  • Types of RespiratorsAir-Supplying:

    supply a clean* source of air

    *maybe

  • Air- Purifying RespiratorsNegative pressureuser draws in air through a filter or cartridgecreates a negative pressure

    Powered air-purifying (PAPR)battery powered pump draws in air through a filterprovides positive pressure to user

  • notes:explain negative pressure: neg atmospheric pressure; lower pressure inside mask/facepiece, and so air moves into spacerequires some work, and can have implications for lung function compromised personsemployees given option to choose PAPRs (arsenic, Pb, coke oven emission & cotton dust standards)

  • Air-Supplying RespiratorsAirline air is supplied to facepiece via air line from either a compressor, a large cylinder or cascade systemSCBA air is supplied via short air line from a user-worn cylinder (thus, self-contained)Airline with escape bottle combo unitSCBA escape only units

  • Operation modes: See tab3-3Demand modePositive pressure modePressure-demand mode

  • Operation modes:Demand mode: air enters facepiece only when wearer creates negative pressurePositive pressure modePressure-demand mode

  • Operation modes:Demand modePositive pressure mode: facepiece is constantly positively pressurized (compared to air outside the facepiece) by a constant flowPressure-demand mode

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

  • Types of FacepiecesTight-fitting: requires seal on face (thus no facial hair); air-purifying or air-supplyingLoose-fitting: no seal on face; airline only (but not airline with escape bottle)

  • Tight-fitting facepiecesFull face: hairline to below chin (covers nose, mouth & eyes)Half face: nose & mouth, & seals under chinQuarter face: nose & mouth, but seals between mouth & chin

  • Loose-fitting facepiecesHood: device covering head & neck Helmet: gives impact & penetration protectionvariations; above with: Blouses (covers shoulders) or Full suits

  • TC approval schedules:TC-13F-XXXXSCBATC-14G-XXXXgas masksTC-19C-XXXXair supplyTC-21C-XXXXDFM (term out-dated)TC-23C-XXXXchemical cartridgeTC-84A-XXXXnon-powered APR (under 84)