In draft operations, what is the minimum depth of water required for a barrel strainer?

In draft operations, what is the minimum depth of water required for a barrel strainer?

• A. 2 feet
• B. 6 feet
• C. 4 feet
• D. 8 feet

Answer: (C)

The main idea is keeping the barrel strainer fully submerged so the pump can draw water without pulling in air. If the water is too shallow, air enters the suction, you lose prime, and discharge falls off or cavitation can occur. Four feet of water provides a safe minimum depth to keep the strainer well beneath the surface and away from surface turbulence, ensuring a reliable prime and steady flow. Deeper water is fine, but less than four feet increases the risk of air uptake and prime loss.

The main idea is keeping the barrel strainer fully submerged so the pump can draw water without pulling in air. If the water is too shallow, air enters the suction, you lose prime, and discharge falls off or cavitation can occur. Four feet of water provides a safe minimum depth to keep the strainer well beneath the surface and away from surface turbulence, ensuring a reliable prime and steady flow. Deeper water is fine, but less than four feet increases the risk of air uptake and prime loss.