Process Manufacturing worked example

Agitator Tip Speed with impeller diameter of 1.75 ft: a worked example

Suppose impeller diameter falls to 1.75 ft. This page works the full calculation at that level so you can see exactly which result moves and by how much. Estimate agitator tip speed from impeller diameter, rotational speed, and unit conversion.

The inputs for this scenario

  • Impeller diameter: 1.75 ft (the input this scenario stresses; the baseline uses 3.5)
  • Agitator shaft speed: 120 rpm (held at the documented default)
  • Pi (circumference constant): 3.14 x (held at the documented default)
  • Drive ratio or unit correction: 1 x (held at the documented default)

Working through the calculation

  • The calculation starts from the formula this tool documents: Tip speed = impeller diameter × agitator speed × circumference factor × correction.
  • agitator tip speed works out to 660 ft / min at these inputs, and this is the headline figure for the scenario.
  • uncorrected tip speed works out to 660 value at these inputs.
  • unit or gearbox correction works out to 1 x at these inputs.
  • diameter speed product works out to 210 value at these inputs.

How this compares with the baseline

  • Against the tool's baseline example, where impeller diameter sits at 3.5 ft and the headline result is 1,319 ft / min, this scenario comes in 50% below the baseline at 660 ft / min.
  • It computes impeller tip speed in ft/min as diameter times shaft speed times pi, with an optional correction multiplier. When the numbers land here, the stressed input is the lever to work; the walkthrough above shows exactly how much each output recovers as it climbs back toward the baseline.

Results at a glance

  • agitator tip speed: 660 ft / min (headline result)
  • uncorrected tip speed: 660 value
  • unit or gearbox correction: 1 x
  • diameter speed product: 210 value

Run it with your numbers

  • To rerun this with your own numbers, open the live Agitator Tip Speed calculator, set impeller diameter to your actual value, and adjust the remaining inputs to match your operation.

Last reviewed 2026-05-12.