AL Pipelines Practice Questions - Alabama Pipelines Contractor Examination Exam

Why must tank vent lines be kept clear and never valved shut or plugged?

The tank could be over-pressured while filling or collapse under vacuum while emptying The vent line carries product to the dispenser The vent provides the tank's cathodic protection current The vent line is the primary fill connection

Correct Answer:

The tank could be over-pressured while filling or collapse under vacuum while emptying

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