G - Physics – 01 – V
Patent
G - Physics
01
V
G01V 3/08 (2006.01) F16L 1/11 (2006.01)
Patent
CA 2230042
A method of achieving improved delectability of pipe, duct or conduit buried below the surface of the earth involves providing the pipe, duct or conduit with a plurality of very small high energy permanent magnetic elements spaced apart along the length thereof. Preferably the elements will be positioned within a groove, or grooves, formed in the external surface of the pipe, duct or conduit, and they will be covered by a protective tape to avoid inadvertent mechanical removal and to avoid contamination once the pipe, duct or conduit has been buried. For plastic pipe there should be a projection extending inwardly of the interior of the pipe adjacent the groove so as to ensure that the wall thickness of the pipe is maintained. A pipe carrying a single longitudinally extending groove should be positioned in the ground with the groove uppermost for maximum flow of gaseous material within the pipe. If the pipe is provided with a pair of diametrically opposed grooves then the pipe should be buried with the grooves generally parallel to the surface of the ground. A pipe, duct or conduit provided with the magnetic elements of the present invention, which can measure in the order of 1.2 mm thick, 6.5 mm wide, and 10 cm long, is easily detectable by a standard gradiometer at a depth of 1.2 m.
Maccario Floriano A.
Macrae & Co.
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