Tanks and Manholes

Manholes, stormwater pits and raw water tanks at sewage treatment plants can easily cause oxygen deficiency and hydrogen sulfide (H2S) poisoning from decomposing organic matter.

There is a high possibility of encountering drowning accidents that workers faint and fall into the confined spaces as a consequence of one breath of oxygen lacked air or highly concentrated hydrogen sulfide (H2S).

Source: Riken Keiki

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