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Key Terms & Concepts To Remember

Static suction lift: The vertical distance from the lowest suction point to the eye of the impeller
Suction friction loss: The resistance encountered in the suction piping
Total dynamic
suction head:
The sum of the suction lift and the suction friction loss
Static Discharge lift: The vertical distance from the eye of the impeller to the discharge point
Discharge friction
The resistance encountered in the discharge piping
Total dynamic
discharge head:
The sum of the discharge lift and the discharge friction loss
Total dynamic head: The sum total of resistance in a pumping application expressed in feet
Velocity, in feet per second: The maximum velocity of liquid through pipe or smooth bore hose is 12 feet per second (CD range) and 14 feet per second (HL range). Velocities greater than 14 feet per second require excessive amounts of energy
Duty point: The point on the pump curve that plots flow (GPM) and head (feet)
CD range pumps: Primarily horizontal pumping. Are capable of handling large quantities of water at lower total dynamic head ratings
HL range pumps: Primarily vertical discharge or pumping into pressure. Are capable of handling quantities of water at significantly higher total dynamic head ratings
Critical lifts: Suction lifts greater than 25 feet are considered critical lifts. The appropriate curve should be read when plotting duty points
Flooded suction: Any time a positive pressure exists on the suction side of the pump

Commonly used pipe & hose - Download PDF

Friction loss estimates based on pipe lengths - Download PDF

Equivalent lengths chart - Download PDF

Pump curve sensitivity chart below.

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