During static source pumping service tests, the barrel strainer must be submerged at least how many feet below the water surface?

• A. 1 foot
• B. 2 feet
• C. 3 feet
• D. 4 feet

Answer: (B)

In static source pumping service tests, the goal is to draw water from a calm portion of the source so the readings reflect true static conditions and the suction remains free of air. Submerging the barrel strainer two feet below the water surface places the intake well below surface turbulence and any air pockets, reducing air entrainment and the risk of erratic flow readings or cavitation. This depth helps ensure the intake stays submerged under varying surface conditions, providing a stable, repeatable test. If the strainer is too shallow, surface air and waves can cause air pockets and unreliable results; deeper submergence beyond the minimum isn’t necessary for this test.