A welder is asked to weld a drum that previously contained a flammable solvent. What is the FIRST required step before welding can begin?
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A
Apply a fire-resistant coating to the outside of the drum
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B
Test the drum with an explosimeter and purge or fill with water/inert gas
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C
Weld quickly to minimize time exposed to residual vapors
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D
Install a local exhaust ventilation system near the drum