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File:Коэффициенты защиты PAPR en.jpg

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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)
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Author AlexChirkin

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