Centrifugal Pump Performance Curve Analysis

Data-driven insight for optimal pump selection, operation, and troubleshooting.
A centrifugal pump performance curve is a graphical representation of a pump's capabilities, showing the relationship between flow rate (Q), head (H), power (P), and efficiency (η). EKG Malaysia provides professional curve analysis services to ensure your pumps are correctly selected, operating efficiently, and free from damaging conditions like cavitation or recirculation.

What a Performance Curve Reveals:

• Head vs. Flow Curve (H-Q): The primary curve. Shows the head a pump can generate at a given flow. The Best Efficiency Point (BEP) is located on this curve.

• Efficiency Curve (η-Q): Shows pump efficiency across its flow range. Operating at or near BEP maximizes efficiency and minimizes wear.

• Power Curve (P-Q): Indicates the motor power required. Ensures the motor is not oversized or underloaded.

• NPSH Required Curve (NPSHr-Q): Critical for avoiding cavitation; shows the Net Positive Suction Head the pump needs at various flows.

Our Analysis Service & Applications:

1. For New Pump Selection:

• We overlay the system curve (your plant's resistance) onto manufacturer pump curves.

• Identify the operating point and ensure it falls within 80-110% of BEP flow for reliable, efficient operation.

• Verify adequate NPSH margin (NPSHa > NPSHr + safety factor).

2. For Existing Pump Troubleshooting:

• We measure actual pump operation (flow, head, power) and plot the point on the published curve.

• Diagnose issues:

  • Operating far right of BEP: High flow, low head – risk of motor overload and cavitation.

  • Operating far left of BEP: Low flow, high head – risk of internal recirculation, overheating, and shaft deflection.

  • Below Curve: Indicates wear (clearance increase) or internal blockage.

  • Above Curve: Could indicate a change in system resistance or speed.

3. For Energy Optimization & Retrofits:

• Identifying if the pump is oversized, leading to throttling losses.

• Modeling the impact of impeller trim or speed change (via VFD) to shift the curve and match the actual system demand.

• Calculating potential energy savings from operating closer to BEP.

Deliverables & Value:

• Clear Report: With graphs, operating point analysis, and actionable recommendations.

• Efficiency Calculation: Current vs. potential efficiency.

• Lifecycle Cost Impact: Showing financial implications of operating off BEP.

• Corrective Action Plan: Such as impeller trim, VFD installation, or pump replacement.

Don't just run your pump—understand it.
Performance curve analysis is the fundamental tool for pump reliability and energy management.

Contact EKG Malaysia for professional centrifugal pump performance curve analysis. We turn data into decisions that improve efficiency, reliability, and your bottom line.