Enter the volumetric flow rate of the liquid through the pipe and the internal pipe diameter into the calculator to determine the pipe velocity.

Pipe Velocity Formula

The following equation is used to calculate the Pipe Velocity.

PV = .408 * Q / D^2

  • Where PV is the pipe velocity (ft/s)
  • Q is the volumetric flow rate through the pipe (gpm)
  • D is the internal diameter of the pipe (in)

What is a Pipe Velocity?

Definition:

A pipe velocity describes the linear speed at which a liquid flows through a pipe. The pipe velocity depends on the volumetric flow rate of the liquid and the pipe’s internal diameter.

How to Calculate Pipe Velocity?

Example Problem:

The following example outlines the steps and information needed to calculate Pipe Velocity.

First, determine the volumetric flow rate through the pipe. In this example, the volumetric flow rate through the pipe is found to be 50 gpm.

Next, determine the internal diameter of the pipe. In this case, the internal diameter of the pipe is measured to be 5 in.

Finally, calculate the Pipe Velocity using the formula above:

PV = .408 * Q / D^2

PV = .408 * 50 / 5^2

PV = .816 ft /s