U.S. Department of Energy - Energy Efficiency and Renewable Energy

Federal Energy Management Program – Operations and Maintenance

Diagnostic Tools for Air Compressors

Compressed gas systems emit very distinct sound patterns around leakage areas. In most cases, these sounds are not audible to the unaided ear or are drowned out by other equipment noises. Using an ultrasonic detector, the analyst is able to isolate the frequency of sound being emitted by the air or gas leak. The ultrasonic detector represents an accurate and cost effective means to locate leaks in air or gas systems.

Within a compressor, there are many moving parts—some in rotational motion and some in linear motion. In either case, these parts generate a distinct pattern and level of vibration. Using a vibration analyzer and signature analysis software, the analyst can discern the vibration amplitude of the point on the equipment being monitored. This amplitude is then compared with trended readings. Changes in these readings are indicative of changes in equipment condition.