Laser Surveys

Topographical Surveys, Land Surveys, Building Surveys And Underground Drainage Surveying

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A Practical Guide For Underground Services Location and CCTV Drainage Surveys

Water

Water mains are either plastic or metal and the method of tracing these two types are different.

Plastic Main
In order to trace this main it is necessary that it is live and that run-off is allowed. See Acoustics
If a trace wire is incorporated when the pipe is laid radiodetection can be used.

What can go wrong
A. Trace limited to 100 metres from transonde
B Sound signal corrupted by ground density (concrete etc.)
C. Sound signal corrupted by traffic and construction plant

Metal Main
A transmitter is attached to a conductive surface of a SV, FH FH, WO etc. or exposed pipe. The active signal is then traced above ground.

What can go wrong
A. Plastic repair incorporated into pipe terminates signal.
B. Ground density corrupts signal

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Last Updated Monday, August 8, 2005 16:25