How large should the flow strainer be on the suction line of a pump?

The flow strainer on the suction line of a pump should be sized to ensure proper flow and prevent any undue pressure drops or flow restrictions. A strainer that is three to four times the suction line diameter is recommended because it allows for a sufficient open area to minimize head loss while effectively filtering out debris and particulates from the fluid. This sizing also helps to maintain an adequate flow rate and can accommodate fluctuations in demand without becoming clogged as quickly.

Using a strainer that is too small can lead to increased operational difficulties, such as frequent cleaning or replacement due to clogging and potential damage to the pump caused by cavitation or decreased efficiency. On the other hand, excessively large strainers may introduce unnecessary costs without added benefit. Therefore, sizing the strainer at three to four times the diameter of the suction line strikes a balance between effective filtration and maintaining optimal flow conditions for the pump system.