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

On below-ambient (chilled or cryogenic) piping, where is the vapor retarder installed?

Against the pipe under the insulation so ice can form in the insulation On the outer (warm) side of the insulation, sealed at joints, so moist air cannot enter and condense Only on the hanger rod, never on the pipe Vapor retarders are used only on 1,200°F steam

Correct Answer:

On the outer (warm) side of the insulation, sealed at joints, so moist air cannot enter and condense

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