Process Manufacturing worked example

Agitator Tip Speed with impeller diameter of 8.75 ft: a worked example

What does the result look like when impeller diameter reaches 8.75 ft? The full calculation is worked below with real intermediate numbers. checking whether an agitator speed is reasonable for a blend, dispersion, or shear-sensitive product

The inputs for this scenario

  • Impeller diameter: 8.75 ft (raised for this scenario; the documented default is 3.5)
  • Agitator shaft speed: 120 rpm (unchanged)
  • Pi (circumference constant): 3.14 x (unchanged)
  • Drive ratio or unit correction: 1 x (unchanged)

Working through the calculation

  • Applying the documented formula (Tip speed = impeller diameter × agitator speed × circumference factor × correction) to the inputs above produces each figure below.
  • At this operating point the engine returns 3,299 ft / min for agitator tip speed, the number this scenario is built around.
  • At this operating point the engine returns 3,299 value for uncorrected tip speed.
  • At this operating point the engine returns 1 x for unit or gearbox correction.
  • At this operating point the engine returns 1,050 value for diameter speed product.

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 150% above the baseline at 3,299 ft / min.
  • A figure at this level is achievable when impeller diameter is genuinely sustained, not just peaked for a shift. Tip speed alone doesn't capture pumping capacity or overall power input; two impellers at the same tip speed can deliver very different flow and blend times.

Results at a glance

  • agitator tip speed: 3,299 ft / min (headline result)
  • uncorrected tip speed: 3,299 value
  • unit or gearbox correction: 1 x
  • diameter speed product: 1,050 value

Run it with your numbers

  • Every input above is editable in the live Agitator Tip Speed calculator, which recalculates instantly and can be shared with the inputs intact.

Last reviewed 2026-05-12.