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Specific case of chlorine solvents in welding: (used for cleaning or degreasing).
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The fumes from these solvents can be changed into toxic gases when subjected to arc radiation, including
from a distance.
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Such solvents may therefore not be used in locations where electric arcs occur, if the solvents are not in a
sealed enclosure.
Work in confined spaces
Examples:
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Mine roads
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Piping and pipelines
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Ship docks, pits, manholes, cellars
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Tanks
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Ballast tanks
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Silos
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Reactors
Special precautions must be taken before undertaking welding operations in such enclosures, where suffocating
and poisoning and fire and explosion risks are very great.
A work permit procedure setting out all the safety measures must systematically be set up.
Make sure that ventilation is appropriate, paying special attention to:
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under-oxygenation
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over-oxygenation
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excess fuel gas
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8695 8014/A
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