How many pipe diameters away from the pump suction flange must check valves be located in the suction pipe?

The correct distance for locating check valves in the suction pipe is based on hydraulic principles to ensure proper flow and system efficiency. Specifically, it is typically recommended to place check valves at least 10 pipe diameters away from the pump suction flange. This distance allows for the establishment of a smooth flow profile and minimizes the risk of turbulence that can cause cavitation or other disruptions in the pump operation.

Once the check valve is positioned appropriately, it can function effectively, preventing backflow without adversely affecting the pump's performance. Proper positioning is crucial because being too close to the pump could lead to flow restrictions, increased wear on the check valve, and inefficient system performance.

While other distances such as 8, 15, or 20 diameters may be used under specific circumstances or in different contexts, the 10-diameter guideline is widely recognized and adhered to in standard practices for maintaining pump efficiency and system integrity.