NM CID GF-4 Practice Questions - New Mexico CID GF-4 Drainage Or Flood Control Systems Contractor Examination Exam

DIPRA recommends that a newly installed ductile-iron pipeline be hydrostatically tested at:

The working pressure for 10 minutes with air only Any convenient pressure the pump happens to reach At least 1.5 times the stated working pressure at the lowest elevation of the test section, for two hours, after air is expelled Twice the working pressure for 24 hours with all vents closed from the start of filling

Correct Answer:

At least 1.5 times the stated working pressure at the lowest elevation of the test section, for two hours, after air is expelled

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