In a multi-line system, what is the consequence of not balancing flows?

• A. It has no effect on performance
• B. One line may starve others or become over-pressurized
• C. It will only affect pump RPM
• D. It improves efficiency

Answer: (B)

In a multi-line system, the pump doesn’t automatically split flow evenly because each branch has different friction losses and demand. If flows aren’t balanced, the path with the least resistance will take more of the pump head, raising pressure there while depriving other lines of enough flow. That means some lines can become starved, failing to deliver the required water or pressure, while other lines can become over-pressurized, stressing pipes, valves, and fittings. This uneven distribution undermines protection and performance targets and can reduce overall efficiency and pump life. Balancing is achieved through proper sizing, balancing valves, and verification with gauges to ensure each line receives its designed share of flow and pressure.