Information for selecting a pump

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Information for selecting a pump

Last updated on May 6, 2026

Answer

1. Piping by Application

  • For pumping
  • For cooling water and cold water
  • For hot water
  • For hot water circulation

2. Pump Performance

  • Discharge rate
  • Total head
  • Shaft power
  • Efficiency
  • Power and efficiency

3. Calculation of Pump Head and Piping Resistance

  • Basic equation for head calculation
  • When considering discharge pressure and suction pressure

    • Total pump head of hydrant pump
    • When the working pressure of the hot water supply equipment becomes a problem
    • Circulation pump
    • Positive suction
  • Calculation example of piping resistance
  • Material for calculating piping resistance

    • Equivalent pipe lengths of fittings and valves
    • Friction loss head of various pipes
  • Determination of the diameter of the water supply pipe
  • Relationship between water temperature and suction height

4. Measuring the Total Head Using a Measuring Instrument

5. How to Read Pump Performance

6. Resistance Curve

7. Water Volume Adjustment

8. Relationship Between Pump Performance and Impeller

9. Parallel and Series Operation of the Pump

  • Parallel operation
  • Series operation

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