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Reading Wilden Performance Curves

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article image Wilden Performance Curves

Integrity Pumps and Engineering  specialises in the supply of a diverse range of pumps including centrifugal pumps, submersible pumps and diaphragm pumps.  

Along with Wilden, Integrity Pumps and Engineering publishes multiple performance curves for most metal and plastic pump models.  

Pumps should be specified for optimum life and performance so that daily operation parameters will fall in the middle of the pump performance curve.  

Wilden performance curves are unique due to the different stroke lengths of the diaphragm assemblies.  

The four classifications include:

  • Rubber-fitted pumps
  • Ultra-Flex-fitted pumps
  • Thermoplastic (TPE)-fitted pumps
  • Teflon-fitted pumps

Using the diagram as a guide, here are the steps to take while reading a Wilden Flow Curve:

  • Determine the flow rate required by the application and calculate the total discharge head
  • Plot the intersection of the discharge head on the vertical axis to the flow rate on the horizontal axis
  • Now the air supply pressure and air supply volume can be extracted from the curve
  • Simply locate the line closest to this intersection and follow it to the vertical axis to the left. This is the air supply pressure needed to provide the flow rate required at the given discharge head
  • Next, locate the red line closest to the intersection and follow it up to where the numbers are provided. These numbers indicate the air supply volume needed to provide the flow rate required at the given discharge head

With reference to the chart:

To pump 394 lpm against a discharge pressure head of 1.4 bar (20 psig) requires 4.1 bar (60 psig) and 102 Nm³/hr (60 scfm) air consumption. Dot on chart represents the plotted intersection and the circled numbers are the air pressure and volume figures.

Temperature limitations are based on mechanical stress only. Certain chemicals will significantly reduce the maximum safe operating temperatures.

Integrity Pumps and Engineering can be consulted on chemical compatibility and temperature limits for specific fluids being pumped in any environment.

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