Enter the empirical constant and the gas density into the calculator to determine the erosional velocity.

Erosional Velocity Formula

The following equation is used to calculate the Erosional Velocity.

EV = C / sqrt(p)
  • Where EV is the erosional velocity (ft/s)
  • C is the empirical constant (lb/s/ft^2)
    • 100 for continuous and 125 for non-continuous service
  • p is the gas density (lb/ft^3)

To calculate erosional velocity, divide the empirical constant by the square root of the gas density.

What is an Erosional Velocity?


An erosional velocity measures the speed at which pipe erosion starts to occur in multiphase flow.

How to Calculate Erosional Velocity?

Example Problem:

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

First, determine the empirical constant. In this example, the empirical constant is found to be 125.

Next, determine the gas density. For this problem, the gas density is found to be 30 lbs/ft^3.

Finally, calculate the Erosional Velocity using the formula above:

EV = C / sqrt(p)

EV = 125 / sqrt(30)

EV = 22.82 ft/s