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Plant Engineering Calculator

Updated Sep 18, 2026

Pump Impeller Tip Speed Calculator — Diameter, RPM & Peripheral Velocity

Calculate impeller peripheral tip speed from rotational speed and diameter, with revolutions per second and circumference as audit outputs.

Live calculationWorking shownPrivate in browser

Inputs

Results

Tip speed 46.34 m/s
Tip speed 152.03 ft/s
Revolutions 49.17 r/s
Circumference 0.942 m
More actions

Shared links reopen these inputs. Recent and saved calculations stay in this browser unless you clear site data.

Formula

u=πDN/60; D in metres, N in rpm, u in m/s.

Your calculation, step by step

These steps use the values currently entered above so the result can be checked independently.

  1. 1.Convert diameter: 300.00 mm ÷ 1000 = 0.30000 m.
  2. 2.Impeller circumference = πD = π × 0.30000 = 0.94248 m/rev.
  3. 3.Rotational frequency = 2950.00 RPM ÷ 60 = 49.16667 rev/s.
  4. 4.Tip speed u = 0.94248 × 49.16667 = 46.3385 m/s = 152.0292 ft/s.

How to use this calculator

  1. Enter measured or design values using the units shown beside each field.
  2. Review the live results and the substituted calculation steps before using the estimate.
  3. Check the assumptions below, then continue to a related calculator when the next engineering decision needs another model.

Worked example

A 300 mm impeller at 2,950 rpm has a peripheral tip speed near 46.3 m/s.

Assumptions and limits

  • Tip speed is not a standalone cavitation, stress or material limit.
  • Use OEM limits and applicable mechanical design standards for final selection.

How to interpret the result

Treat the primary result as an engineering screening value, then use the secondary outputs to understand scale, energy or operating impact. Confirm site measurements, equipment limits and applicable standards before making a design or control change.

Questions engineers ask

Why does the tip-speed formula use full impeller diameter?

One revolution moves the blade tip through one circumference, πD. Multiplying that distance by revolutions per second (RPM ÷ 60) gives tangential speed u = πDN/60.

Can tip speed tell me whether a pump will cavitate?

No. Tip speed is a kinematic value, not an NPSH or cavitation criterion. Cavitation risk depends on suction conditions, vapor pressure, NPSH available/required and pump geometry.

Can I use a generic maximum tip speed as a pump design limit?

No. Mechanical stress, material, impeller construction and OEM design determine allowable speed. Use the calculated value to compare cases, then verify the actual machine limit with manufacturer and applicable design data.

Continue the calculation

Use the next calculator in the same engineering workflow instead of restarting from search.

pump specific speedpump impeller trimpump npsh
Methodology. MAXScanner shows the governing formula, entered values and calculation outputs so the estimate is auditable. The calculator is a screening aid; assumptions and equipment-specific limits remain part of the engineering review.