What is the minimum hydrotest duration to evaluate the integrity of a buried pipe?

What is the minimum hydrotest duration to evaluate the integrity of a buried pipe?

• A. 4 hours
• B. 12 hours
• C. 8 hours
• D. 24 hours

Answer: (C)

When you test a buried pipe with a hydrostatic hold, you want a duration long enough for any leaks to reveal themselves and for the system to stabilize under pressure. Eight hours provides a practical minimum that covers the time needed for slow leaks at joints, welds, or through defects to become evident, while keeping field work reasonable. Shorter durations, like four hours, can miss slow leakage paths, whereas longer holds (twelve or twenty-four hours) are usually reserved for special cases or high-consequence services. So eight hours is the standard minimum for evaluating the integrity of buried piping in typical situations.

When you test a buried pipe with a hydrostatic hold, you want a duration long enough for any leaks to reveal themselves and for the system to stabilize under pressure. Eight hours provides a practical minimum that covers the time needed for slow leaks at joints, welds, or through defects to become evident, while keeping field work reasonable. Shorter durations, like four hours, can miss slow leakage paths, whereas longer holds (twelve or twenty-four hours) are usually reserved for special cases or high-consequence services. So eight hours is the standard minimum for evaluating the integrity of buried piping in typical situations.