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Pump Selection

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

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Pump Selection

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  1. 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

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

  3. Centrifugal Pump Curves • Flowrate • Total head • Power • Efficiency • NPSH • Impeller size

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

  5. Identify the lines and associated units:

  6. 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?

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

  8. Pumps FBM is a function of material and pressure factors.

  9. Suction pressure? Discharge pressure?

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