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How to Figure the Pump Curves in Hydronics

Hydronic, or water pumps, are used for fresh, raw water supply, process heat exchange boilers, cooling and chilled water systems, heating and steam systems, and wastewater treatment and drainage. Hydronic pumps transfer liquid from one source to a required destination, usually a high reservoir, or circulate liquid around a system for heat transfer. The pump curve measures the pump's energy-output potential and efficiency.

Things You'll Need

  • Hydronic pump
  • Graph paper
  • Colored pencils
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Instructions

    • 1
      Head is recorded in feet on the left-hand, vertical side of the graph.

      Measure the difference in the elevation between the inlet and outlet of the hydronic pump system in feet to determine head, which is commonly taken to mean the difference in elevation between the suction level and the discharge level of the liquid being pumped. Using graph paper and a red pencil, mark the head number in feet in the left-hand, vertical margin of your pump curve graph.

    • 2
      Flow is recorded on the bottom, horizontal border of the graph.

      Locate manufacturer's guidelines for the flow rates of any given hydronic pump, which is described in gallons per minute -- GPI -- in the provided instructions. Determine your pump's flow rate based on the pump's horsepower and the diameter of the piping using the specific pump's manufacturer's guidelines.

    • 3

      Use a blue pencil to mark the GPI number on the graph horizontally on the bottom border of the graph, perpendicular to the head in the left-hand, vertical margin.

    • 4

      Use a green pencil to draw an arc from the head number, marked in red, in the left-hand margin, to the maximum GPI number, marked in blue, at the bottom to figure the hydronic pump curve.

    • 5

      Increase the pump curve as desired by using a stronger pump, using multiple pumps or by increasing the diameter of the piping. Use the pump calculator at The Engineering ToolBox to replace generic values with actual values to discover any given hydronic pump systems volume capacity, head and energy output.

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