ADS Environmental Services Eureka2R QR 775019 A1 - Manual (Page 9)

ADS Eureka2R Leak Noise Correlator User Manual
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C H A P T E R 2
Principles of Leak Noise Correlation
Leak noise correlation is used to detect leaks in pipes with a positive internal
pressure, where leaks allow a loss of flow to the outside. The movement of
fluid through the leak causes rapid pressure changes around the site of the
leak, establishing a noise source at the leak. This noise travels in both
directions, at the same velocity, along the pipe from the leak. These principles
are used to determine the leak location.
Note: Noise is not a constant frequency, like a musical note, but a
random and constantly changing blend of different frequencies. The
correlator operates on this principle.