SC Water And Sewer Plants Practice Questions - South Carolina Water And Sewer Plants Contractor Examination Exam

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When testing the atmosphere of a permit-required confined space under OSHA 1926 Subpart AA, what is the required order of tests with a calibrated direct-reading instrument?

Toxic gases, then oxygen, then flammable gases and vapors Flammable gases and vapors, then toxic gases, then oxygen Oxygen first, then flammable gases and vapors, then toxic gases and vapors Oxygen and toxics simultaneously, with flammables tested only if the space is classified

Correct Answer:

Oxygen first, then flammable gases and vapors, then toxic gases and vapors

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