Heath Consultants Aqua-Scop - Manual (Page 26)

SOUND LEVEL INTENSITY AT DIFFERENT TEST POINTS
(Figure 13)
For the pinpointing of the leak, the Ground Microphone will be placed
as exactly as possible over the water main or service with test points a
maximum of 6’ apart. All noises received are to be compared with each
other. The approach to the leak will be recognized by a higher intensity and
increase of the noise. Above the point of leakage the intensity will reach
a maximum. As you pass the leak the intensity will decrease. The meter
reading will show the same result as the Audio test.
Example of a Pinpointing Situation:
(Figure 14)
In the example of the preliminary detection (Figure 14), a leak near the point
of measurement number 6 was anticipated. For final pinpointing with the
Ground Microphone, the section between points 4 and 7 will be checked at
close intervals (3’ to 6’), and near point 6 you will find a very strong noise.
This is the source of the leakage. When doing such examinations with the
Ground Microphone you should extend the test pattern as the leak may
cause false noises. Some examples from practical use are detailed later in
this Guide.
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