File:Коэффициенты защиты PAPR en.jpg
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Summary
| Description |
Русский: Показаны значения коэффициентов защиты (отношения концентрации вредных веществ снаружи лицевой части к концентрации под лицевой частью, во вдыхаемом воздухе) у фильтрующих респираторов с принудительной подачей воздуха (Powered Air-Purifying Respirator PAPR) под не плотно прилегающую лицевую часть (шлем или капюшон).
Результаты измерений во время работы на рабочих местах выявили неожиданно низкую эффективность СИЗОД: вместо снижения загрязнённости воздуха в 1000 раз и более (что они стабильно показывали в лабораторных условиях), коэффициенты защиты (Protection Factors PF) снижались до 23-24, и как правило не превышали 200. Полученные результаты заставили изменить область допустимого применения таких СИЗОД - с 1000 ПДК до 25 ПДК (США) и до 40 ПДК (Великобритания)English: The diagram show 92 values of the Workplace Protection Factors WPFs (the ratio of the concentration of harmful substances in the breathing zone outside the facepiece to the in-facepiece concentration, in the inhaled air) of Powered Air-Purifying Respirators (PAPRs) with loose-fitting facepieces (hood or helmet).
These workplace (field) studies revealed unexpectedly low RPD performance: instead of reducing air pollution in 1000 times and more (that they consistently demonstrated in the laboratory conditions), the worcplace PF decreased up to 23-24, and usually does not exceed 200. These results led to change the Assigned Protaction Factors (allowable area of usage) of such PPE - from 1000 PEL to 25 PEL (in US); and up to 40 OEL (in UK) |
| Date | |
| Source | Own work |
| Author | AlexChirkin |
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 11:30, 30 June 2016 | | 2,660 × 2,380 (986 KB) | AlexChirkin | User created page with UploadWizard |
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