Slip in a pump is the percent of water taken into the suction and that is not discharged.

Slip in a pump is the percent of water taken into the suction and that is not discharged.

• A. The ratio of discharge to intake
• B. The percent of water taken into the suction and that is not discharged
• C. The energy lost due to friction
• D. The difference between theoretical and actual head

Answer: (B)

Slip describes what portion of the water that enters the pump suction does not appear at the discharge because it recirculates or leaks inside the pump. In other words, it’s the fraction of intake that doesn’t get discharged. It’s calculated as (inlet flow − outlet flow) divided by the inlet flow, times 100 percent. This concept helps explain why a pump delivers less flow than would be expected from its suction input, due to internal flow patterns and recirculation. It isn’t about energy lost to friction, nor simply the ratio of discharge to intake, nor the difference between theoretical and actual head.

Slip describes what portion of the water that enters the pump suction does not appear at the discharge because it recirculates or leaks inside the pump. In other words, it’s the fraction of intake that doesn’t get discharged. It’s calculated as (inlet flow − outlet flow) divided by the inlet flow, times 100 percent. This concept helps explain why a pump delivers less flow than would be expected from its suction input, due to internal flow patterns and recirculation. It isn’t about energy lost to friction, nor simply the ratio of discharge to intake, nor the difference between theoretical and actual head.