What duration is specified for recirculating water in storage tanks?

• A. 1 hour
• B. 30 minutes
• C. 2 hours
• D. 15 minutes

Answer: (A)

Maintaining water quality and system readiness requires circulating the water in the storage tanks long enough to turnover the entire volume. Running the recirculation loop for one hour ensures the water moves through the tank and piping, ventilates any trapped air, and helps flush out any sediments or stagnation that can develop when water sits.

If the circulation time is too short, pockets of stagnant water may remain and you won’t reliably verify that the entire system can deliver water at the expected pressure. If it’s longer than necessary, you’re wasting time that could be spent on other checks. One hour provides a practical, standard duration for confirming that the storage tank and recirc loop are functioning properly and ready for use.