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7.0 LEAK PINPOINTING WITH THE S30
The S30 can also be used as a leak pinpointing device. Leak sounds
being emitted from a pressurized pipe can transfer through the ground
and be detected on the surface above the leak. This technique is
called "Surface Sounding" or "Ground Miking". The success of this
method varies from leak site to leak site. The variables that dictate
your effectiveness are: Depth of Pipe, Size of Leak, System Pressure,
Soil Conditions, Surface Material, Traffic and Wind.
In order to effectively utilize this method, the operator must already
know that there is a leak in the vicinity and he must know where the
water main is located.
7.1 SET-UP: To properly use the S30 for pinpointing, the ground
microphone plate should be attached to the bottom of the
transducer magnet. See diagram below.
7.2 PINPOINTING: Place the transducer assembly on the ground
above the water main. Press the “ON/OFF” BUTTON to activate
the S30. Determine whether or not you hear the leak at this
location. Use your ears and the meter to determine the intensity
of the sound and make a notation of it. Move the transducer
assembly about 3' and repeat the process. Continue this
process every few feet until you have discovered the loudest
Sound Waves
