SC Pressure And Process Piping Practice Questions - South Carolina Pressure And Process Piping Contractor Examination Exam

Before entering a permit-required confined space to weld inside a vessel, in which order must the atmosphere be tested?

Toxics first, then oxygen, then combustibles Oxygen first, then combustible gas (LEL), then toxic gases and vapors Combustibles only; oxygen can be assumed to be 20.9% No test is required if the vessel was rinsed with water

Correct Answer:

Oxygen first, then combustible gas (LEL), then toxic gases and vapors

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