2011-9-27 10:17:00

防范硫化氢中毒的安全技术措施

（一）气体检测 　　1、用人单位要摸清自身界内存有硫化氢等有害气体的危险源分布情况（如塔、沟、池、釜、罐、下水道等），定期进行气体监测和分析； 　　2、作业前，应对作业环境进行监测，判明是否存在硫化氢等有毒有害气体和空气中氧气的含量情况。允许接触值参考常见有毒有害气体允许浓度和爆炸范围和《工作场所有害因素职业接触限值》（工作场所空气中有毒物质容许浓度）； 　　3、作业中，应保持必要的测定次数或连续监测； 　　4、气体检测仪必须符合国家标准并定期检测； 　　5、气体检测应由取得监测资质的单位和人员进行。 　　（二）通风、降水 　　1、作业前，必须先行通风。采取自然通风或人工强排通风的手段，污水管道内按照平均风速0.8m/s计算通风机的风量，作业场所有毒有害、易燃易爆气体允许浓度达到国家标准后，方可进行作业； 　　2、对于硫化氢浓度变化大的作业，必须同时进行通风； 　　3、固定封闭式的沉淀池、纸浆池等设施，必须装设固定的机械通风系统，池的进入口面积不应小于1. 5平方米，并在开口上方加装安全防护网，凡不宜装设固定式通风系统的，必须配备移动或便携式的通风设施； 　　4、对于进入管道内的作业，作业前必须提前降水，避免潜水作业，作业时要联系好上、下游水泵停车、开车时间，防止溺水事故发生。

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