To maintain the rated performance of a pump, what is the maximum length of suction line you can have?

The correct choice regarding the maximum length of a suction line to maintain the rated performance of a pump is important for ensuring efficient operation. A suction line that exceeds its recommended length can lead to a reduction in the pump's ability to draw water effectively, creating a situation known as cavitation. In this context, 20 feet is typically recognized as a practical maximum length for maintaining the pump's efficiency and preventing cavitation.

This distance ensures that the hydraulic resistance in the line remains low enough for the pump to perform optimally while minimizing the risk of losing prime. Longer suction lines would introduce more friction loss and potential air leaks, impacting the pump's ability to maintain a proper flow of water. Therefore, limiting the suction line to 20 feet supports both effective water delivery and overall equipment longevity.