Ways to improve pump efficiency

• Change to a more efficient pump.
  • Example: switch an air pump to an electric-driven pump.
• Add a VFD if the flow is variable and being throttled.
  • Pump efficiency changes exponentially with speed (affinity laws apply to centrifugal pumps; for example, 80% speed may require about 50% power).
  • The exponent of 3 is theoretical; real-world best case is approximately 2.2.
• Use pump optimization strategies.
  • Use pump staging.
  • Use the minimum pump power needed to meet the flow requirement.
  • Trim the impeller if reduced but constant flow is needed.

Types of pumps

• ANSI centrifugal
• Lobe sanitary
• Self-priming centrifugal
• Rotary gear
• Horizontal split case
• Metering/dosing
• Reciprocating plunger/piston
• Air operated
• High pressure
• Multi-stage
• Progressive cavity
• Submersible
• Vertical pumps
• Diaphragm
• Magnetically driven

Common uses for pumps today

• Irrigation
• Water supply
• A/C systems
• Refrigerant
• Chemical movement
• Sewage movement
• Flood control
• Marine services

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