of leaks in pressurized water pipes can travel for hundreds
(even thousands) of feet in every direction down the mains
and services. If there is no evidence of the leak, then compare
the loudness of the leak sounds at the meters, valves, and
you have found the two meters, valves, or hydrants with
the loudest leak sounds, you are ready to begin the final "pinpointing".
First, mark the exact location of the pipe between the
two loudest valves, meters, hydrants, etc. with a pipe
locator. Then listen every 2-3 feet directly over the
over the pipe between these two loudest locations. Use your
hearing and the meter to determine exactly where the leak
sound is loudest:
||If the pipe
is under soft ground or loose fill and if it is not too deep
(only 3-5 feet), then using boring bars or push rods may be
effective. Touch the pipe if possible, but if the pipe is
deep or the soil is rocky, try to get the bars in firmly at
least 2-3 ft deep.
Always check for other underground utilities like gas lines or cables
before pushing bars or rods into the ground over the pipe.
magnet base on the sensor. Listen on the bar close to the ground
(less wind). Compare the loudness at all the bars with your hearing
and with the Meter Display.
boring bars (or push rods) touching the pipe at 2 or 3 locations,
compare the loudness of the leak:
one bar is louder, then it is closer to the leak. Move the
other bars closer to the loudest bar and listen again. Keep
moving the bars until they are only 5-10 ft apart and center
bar is loudest. Dig.
||The Low and
High Filters are used to filter out outside noises of wind,
traffic, A/C hum, etc. If you encounter these interferences,
try the 200 Hz filter or 400 Hz filter while listening on
the same surface but 15 feet away
from the water lines:
the filter removes the outside noise, then listen over the
pipe again and re-adjust the Volume.
HOME | WATER
LEAK DETECTORS | CORRELATORS | LEAK
NOISE LOGGERS | TRAINING | FINDING
LEAKS | WHAT
OUR CUSTOMERS SAY | CONTACT US
SubSurface Leak Detection