呼吸保护装置的呼吸工作:方法实施,实验室内,实验室间的变化和可重复性
William P King1, Margaret Sietsema2, Caitlin McClain1
1National Institute for Occupational Safety and Health, National Personal Protective Technology Laboratory, Pittsburgh, Pennsylvania 15236.
概括
国家个人保护技术实验室验证了一种新的呼吸工作 (WOB) 方法,用于呼吸道保护装置 (RPD),以满足ISO标准. 该方法准确且可重复测量RPD空气流阻力,确保可靠的性能测试.
科学领域:
- 职业健康和安全问题 职业健康和安全问题
- 生物医学工程 生物医学工程
- 工业卫生 工业卫生
背景情况:
- 国际标准化组织 (ISO) 技术委员会94/小组委员会15 (TC 94/SC 15) 通过了呼吸保护装置 (RPD) 的呼吸工作 (WOB) 性能标准.
- 美国国家职业安全与健康研究所 (NIOSH) 国家个人保护技术实验室 (NPPTL) 的目标是将这项拟议的WOB方法与RPDs的现有阻力测量技术进行比较.
研究的目的:
- 建立符合ISO SC15标准的RPD气流阻力测量方法.
- 为了验证WOB测量方法的运行性能和合规性.
- 评估各种RPD设计的WOB测量的可重复性和可重复性.
主要方法:
- 根据ISO 16900-5:2016和ISO 16900-12:2016标准实施的WOB测量程序.
- 使用体积平均呼吸总工作 (WOBT/VT) 来评估空气流阻力,使用标准孔分析变化和偏差.
- 测试了标准孔和实际的RPD (空气净化和供应空气),以验证方法的准确性和可重复性.
主要成果:
- 使用标准孔的初步验证证实该方法符合ISO要求,并与其他实验室相等.
- 基于潮体积和频率的RPD测试显示了合规性,适当的调整将平均绝对偏差降至1.7%.
- 对WOBT/VT的平均变化系数为2.3%,超过97%的结果在长期使用期间符合规格;对各种RPD类型的WOBT/VT测量是可重复的 (p<0.05).
结论:
- NIOSH NPPTL成功实施和验证了RPD的ISO WOB方法,始终提供符合ISO的验证.
- 该方法证明了适当密封的RPD的高可重复性和可重复性,平均偏差为1.7%.
- 不密封的半面罩RPD的WOBT/VT测量比密封的RPD低31%,这凸显了性能测试中适当密封的重要性.
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