Ultrasonic Inspection: Compressed Air & Gas

The U.S. Department of Energy and Office of Industrial Technologies encourage the use of ultrasonic detectors for leak detection¹. Ultrasonic detection is unsurpassable in its abilities to quickly and easily detect and pinpoint leaks, allowing any facility to take corrective action - and realize immediate savings directly related to reduced energy costs.

Regardless of the type of gas or low-pressure variables, the CTRL UL101 sensor is ideal for leak detection and is able to detect leaks in compressed air/gas systems. In some cases, leaks have been detected in systems pressurized to less than 3 psi. The UL101's high sensitivity, selectivity, and signal-to-noise ratio help to distinguish leaks in the harshest environments. Furthermore, the UL101 is extremely capable of reproducing ultrasonic signals so they are familiar (Listen to an air leak below).

It is necessary to start an air survey or audit by adjusting the UL101 to a high sensitivity setting. The Concentrator or Acoustic Extension Probes are recommended as the ideal attachments during testing for shielding ambient ultrasound and directing the area of reception. The PowerBeam 300 can also be used to detect ultrasound up to 300 feet away, so it is suggested to use the PowerBeam 300 for the detection of leaks on high ceilings or in areas where it is unsafe. A quick scan of the air/gas system will allow detection of leaks from 50 feet away or more (depending upon the environment and the nature of the air/gas system).

When performing a routine survey, start from the compressor and work outward along the air/gas lines. If a leak is found, adjust the sensitivity of the UL101 down and move closer to the source. The leak can be pinpointed within 1/4", tagged, and fixed at a convenient time. The UL101 can then be used to verify that repairs were done properly and leaks no longer exist in the system.

1. Office of Industrial Technology/U.S. Department of Energy: http://www.oit.doe.gov/bestpractices/pdfs/compressed_air3.pdf

Listen to an Air/Gas Leak

<< Prev: Types of Gases || Next: Case Studies>>