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Before entering the confined space, the amount of air in the tank must be measured and properly ventilated.
Male into the manhole tank stainless chemical area confined space safety blower fresh air
Male worker inspection visual chemicals stainless steel blower fresh air into storage tank confined space
Safety workplace defocused of construction worker holding confined space permit book paper prior starting job
Duty of care certified site safety officer inspector hand conducting continue monitoring holding gas testing atmosphere detector at entry exit confined space manhole door while worker working inside

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