How to choose the right water pump

When selecting a pump, follow these general guidelines for an informed decision:

Step 1: Consult Professionals

• Primary Advice: Always prioritize recommendations from your design office or pump installation departments.

Step 2: Assess Your Needs

• Capacity and Head Requirements: Determine the required capacity (flow rate) and head (pressure).
  • Use the Performance Chart in the catalog to find pumps that match your capacity and head needs.
  • The optimal operating point should be within the pump's running range, ideally at its rated point.

Step 3: Example Calculation

• Household Usage Example:
  • Calculate the total water usage by summing the demand of all appliances likely to be used simultaneously.
  • For a house on the second floor (3m above the pump), with a tap (15L/min), washing machine (15L/min), and shower (15L/min), you need a pump that delivers 45L/min at a head of 3-5m, such as the Js100 model.

Step 4: Determine Application Field

• Usage Categories:
  • Domestic Pumps: For home use, usually handle clean liquids and non-aggressive chemicals.
  • Civilian Pumps: Used in buildings, worksites, workshops, farms for water distribution, irrigation, cooling, fireproofing, etc.
  • Industrial Pumps: Used in significant industrial applications, handling chemicals, food liquids, etc.
  • Important: Do not interchange pumps designed for different uses as it can lead to rapid wear or damage.

Step 5: Choose the Pump Type

• Pump Types:
  • Peripheral Pumps: Higher head, lower capacity. Economical for higher head requirements.
  • Centrifugal Pumps: Larger capacity, higher efficiency, good for saving energy.
  • Jet Pumps: Reliable output with consistent power requirements across varying heads and capacities.

Step 6: Consider Suction Head

• Suction Head:
  • Domestic Pumps: Maximum suction lift is about 8m.
  • Deep Well Pumps: Used for deeper suctions (up to 15m), combining jet and centrifugal pump features.
  • NPSH (Net Positive Suction Head): Important for industrial and civilian pumps to ensure stable operation.

Additional Advice

• Electromotor-driven Pumps: Preferable for their reliability.
• Operating Conditions:
  • Avoid running centrifugal pumps under low head conditions as it increases power requirements.
  • Avoid running peripheral pumps under high head conditions for the same reason.
  • Jet pumps are versatile with minimal power changes across different heads and capacities.

Final Considerations

• Efficiency: Evaluate the pump's energy efficiency.
• Appearance and Price: Consider the pump’s aesthetics and cost before making the final decision.

By carefully evaluating these factors, you can select the most suitable pump for your needs.