Leak Rate Calculator

Formula

To calculate the Leak Rate (LR):

\[ LR = \frac{V \times \Delta P}{\Delta t} \]

Where:

\(LR\) is the Leak Rate in ft-lbf/sec
\(V\) is the Volume of the part in cubic feet (ft³)
\(\Delta P\) is the Change in Pressure or pressure loss in pounds per square foot (psf)
\(\Delta t\) is the Change in Time in seconds

What is a Leak Rate?

A leak rate is defined as the rate of flow, or “leak”, of gas out of a container that is attempting to hold the gas. This can be determined using the ideal gas law and is typically measured in units of flow rate such as ft-lbf/sec.

Example Calculation

Let's assume the following values:

Volume (\(V\)) = 10 ft³
Change in Pressure (\(\Delta P\)) = 200 psf
Change in Time (\(\Delta t\)) = 60 seconds

Using the formula:

\[ LR = \frac{10 \times 200}{60} = \frac{2000}{60} = 33.333333 \text{ ft-lbf/sec} \]

The Leak Rate is 33.333333 ft-lbf/sec.