AL Pipelines Practice Questions - Alabama Pipelines Contractor Examination Exam

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When a gas line section is taken out of service for tie-in work, why is it purged with an inert gas such as nitrogen before hot work?

To displace the flammable mixture so no ignitable atmosphere exists in the line To increase the line pressure for testing To dry the coating on the outside of the pipe To odorize the line before it returns to service

Correct Answer:

To displace the flammable mixture so no ignitable atmosphere exists in the line

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