Pump Selection Centrifugal - low P (<3.5 MPa), low viscosity, high flow rates Rotary positive displacement - medium P (<20 MPa), medium viscosity, medium.

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Presentation transcript:

Pump Selection Centrifugal - low P (<3.5 MPa), low viscosity, high flow rates Rotary positive displacement - medium P (<20 MPa), medium viscosity, medium flow rates Reciprocating - high P (<150 MPa), high viscosity, low flow rates Special issues - corrosion and abrasion See Figure 12-3 course pack

What determines pump size? Operating pressure Elevation change Acceleration of fluid Frictional losses

Centrifugal Pump Curves Flowrate Total head Power Efficiency NPSH Impeller size

Schematic Pump Curve TDH? units? GPM? %? HP? NPSH? units? What is in inches?

Identify the lines and associated units:

Pump NPSH Net Positive Suction Head (NPSH) = Head required at suction of pump in excess of the bubble pressure of the fluid at the pump temperature Why does this matter?

Pump costing Based on power Affected by Adjust for… Materials Operating pressure Type of pump Adjust for…

Pumps FBM is a function of material and pressure factors.

Suction pressure? Discharge pressure?