How do I calculate Pipe Diameter Selection?

To calculate Pipe Diameter Selection: Enter Flow rate Q, Maximum flow velocity, Pipe wall thickness. Click Calculate. INDUGRID computes the result instantly using the formula: D = √(4Q / (π × v_max)) [m] where Q = flow in m³/s. No registration required.

What units does the Pipe Diameter Selection calculator use?

The Pipe Diameter Selection calculator uses the following units: l/min, m/s, mm. SI units are used by default.

Is the Pipe Diameter Selection calculator free?

Yes. The INDUGRID Pipe Diameter Selection calculator is completely free, requires no account or login, and works on desktop and mobile browsers.

Fluid Mechanics

Pipe Diameter Selection

Determine the minimum required pipe internal diameter for a given flow rate and maximum allowable flow velocity.

Units:

in LinkedIn

💡Recommended flow velocities: water supply 0.5–2.0 m/s, cooling water 1–3 m/s, hydraulic pressure lines 2–4 m/s, hydraulic return lines 1–2 m/s, compressed air 8–15 m/s. Higher velocity means more noise and pressure loss.

D = √(4Q / (π × v_max)) [m] where Q = flow in m³/s

Input

Flow rate Q iRequired volumetric flow rate in litres per minute.

l/min

Maximum flow velocity iMaximum allowable flow velocity. Water: 1–3 m/s. Hydraulic pressure: 2–4 m/s. Return: 1–2 m/s. Air: 8–15 m/s.

m/s

Pipe wall thickness iWall thickness in mm to calculate external diameter.

Result

Minimum internal diameter [mm] —

Recommended standard DN [DN (mm ID)] —

Actual velocity at standard DN [m/s] —

Flow area [cm²] —