For which gases is LeakExpert suitable for estimating leakage loss?

Quantitative loss estimation with LeakExpert is primarily intended for air and compressed air.

The calculation algorithm is based on practical leak measurements and considers the relationship between the measured ultrasonic level, the system pressure, and the amount of escaping gas.

However, the acoustic emission of a leak depends on the properties of the respective gas. Relevant factors include:

• speed of sound,
• density,
• temperature,
• pressure,
• viscosity,
• flow behavior at the leak.

Air and compressed air

For air and compressed air, LeakExpert can estimate the leakage loss as a volumetric flow rate in L/min. The calculation method is intended for these media.

Nitrogen

Under comparable conditions, nitrogen has acoustic and flow properties similar to those of air. A quantitative loss estimate may therefore be possible as an approximation.

However, the result should be treated as an estimate because the calculation method was developed primarily using air and compressed-air leaks.

Other gases

For gases whose physical properties differ significantly from those of air, a reliable quantitative loss estimate is not generally possible. This particularly applies to very light gases or gases with substantially different acoustic properties.

Such leaks can nevertheless be located and assessed qualitatively using ultrasound, provided that sufficiently strong turbulent flow is generated at the leak.

Possible qualitative assessments include:

• leak present or not present,
• high or low ultrasonic level,
• comparison of several leaks,
• change after a repair.

Selecting a gas in the app may also be used to document the measurement. It does not automatically mean that a validated quantitative loss calculation is available for that gas.

When testing hazardous, flammable, reactive, or harmful gases, all applicable safety regulations and operational approvals must be observed.