Locating non metallic (PVC, ferro
cement) and metallic pipes using acoustics.
As plastic and fibre cement pipes are not electrically conductive
they cannot be located with instruments such as the Sewerin ELH
6 or the AF
100 which detect electromagnetic fields. To locate
and trace plastic and non metallic pipes we have the System Combiphon®
which utilises acoustics as the detection principle. |
Distribution Pipes
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The “Stopper” is an
electrically driven, intensity controlled piston. It is
attached to a hydrant standpipe. The hydrant is turned on
and water is allowed to flow. When the battery driven control
unit, “G5”, is turned on it activates the piston
which alternativly restricts and widens the water outlet.
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Hearing the pipe's location
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The water column
in the pipe is consequently set in motion with a resulting
“heartbeat” sound which can be detected on the surface with
a ground microphone such as the AQUAPHON®
A 100 the highest sound is heard is where
the pipe is located. The intensity of the “heartbeat” is
set via an adjuster on the stopper. In situations where
there are competing sounds and you wish to turn the unit
off to ensure that you are listening to the “heartbeat”,
there is a remote control which allows for single man operation.
An advantage in using an electrically controlled piston,
as opposed to a spring one, is that changes in water pressure,
caused by a supply pipe being turned off & on, have no effect
on the settings. Due to the unique design of the piston
the back pressure is minimum so damage to the pipe & house
service fittings is highly unlikely
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Locating and Tracing Service pipes
- Water or gas
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On smaller pipes such as house
service lines for water or gas the "Knocker" is used
instead of the Stopper. It attaches around the pipe with
an adjustable chain. When it is powered it “taps” on the
surface of the pipe and the resulting noise is heard on
the surface by the ground microphone. Frequency & intensity
can be adjusted via remote control. For example near walls
less intensity is preferable but over longer distances higher
levels will travel further
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Technical data of Combiphon generator
G5
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- Power supply: built-in lead acid rechargeable battery
with optional 12 V adapter or 12 V car cigarette lighter
lead
- Operating time:with the Knocker, between 5
– 80 hrs
- Operating temperature: -10 °C up to +50 °C
- Protection class: IP 54
- Dimensions (W x H x D): 60 x 19 x 21 cm (compartment
for knocker and adapter, car adapter L)
- Weight: approx. 6.3 kg with adapter
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