Zonescan Case Study 1 - Essex & Suffolk Water, Tilbury.

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A trial Zonescan survey carried for Essex & Suffolk Water in Tilbury was commissioned to try and locate a burst AC main that so far had given two results using a leading leak noise correlator, both of which had been dry excavations.

The area surveyed was a council estate near to Tilbury Docks on the north bank of the Thames.
25 loggers were deployed in the DMA with the main area of interest centring on logger numbers:
100194, 100191, and, 100087. These loggers were arranged in a “T” formation on a section of pipework within the DMA. The previous excavations had been made between the locations of loggers 100194 and 100087.

Logged Results:

Logger 100194: The logged results indicate leak noise at all three loggers with the respective cross correlation results between the loggers shown on the right.	Logger 100087: The logged results indicate leak noise at all three loggers with the respective cross correlation results between the loggers shown right..	This is the result of the correlation of sound signals recorded by loggers 100194 and 100087. It clearly shows no clear point of correlation that would indicate the location of a leak.	But this correlation of recorded sound signals between loggers 100194 and 100191 clearly indicates the location of a leak 82.5m from logger 100194. This was confirmed by surface sounding and the leak was repaired following a successful excavation.

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