In drafting, what term describes the vertical distance from the water surface to the pump intake?

In drafting, what term describes the vertical distance from the water surface to the pump intake?

• A. Lift
• B. Head
• C. Pressure
• D. Elevation

Answer: (A)

In drafting, the vertical distance water must be raised from the surface up to the pump’s suction inlet is called lift. This distance directly affects the suction pressure the pump must create; the greater the lift, the more the pump has to work to pull water into the intake, and it influences the risk of cavitation and the available NPSH. Head is a broader term referring to pressure energy or the height of a fluid column, rather than the specific vertical rise from source to pump intake. Elevation is simply how high something is above a reference point, not the suction distance. So the term that fits this definition exactly is lift.

In drafting, the vertical distance water must be raised from the surface up to the pump’s suction inlet is called lift. This distance directly affects the suction pressure the pump must create; the greater the lift, the more the pump has to work to pull water into the intake, and it influences the risk of cavitation and the available NPSH.

Head is a broader term referring to pressure energy or the height of a fluid column, rather than the specific vertical rise from source to pump intake. Elevation is simply how high something is above a reference point, not the suction distance. So the term that fits this definition exactly is lift.