Hydraulic and earth engineering – Subterranean or submarine pipe or cable laying – retrieving,... – With protection or indication of pipe or trench
Patent
1988-02-08
1988-08-30
Taylor, Dennis L.
Hydraulic and earth engineering
Subterranean or submarine pipe or cable laying, retrieving,...
With protection or indication of pipe or trench
174 37, 324326, 324510, 405154, F16L 5700, G01V 308
Patent
active
047672374
ABSTRACT:
A marking tape that is positioned underground above utility lines wherein the marking tape carries a pair of closely spaced, parallel, insulated conductors that extend the length of the tape and at least one other insulated conductor extending the length of the tape which is separated from the pair of conductors at a distance that is greater than the distance between the conductors of the pair of conductors. Passive markers having a resonant circuit can be selectively placed along the tape wherein the resonant circuit is electromagnetically coupled to the pair of conductors and the other conductor. The other insulated conductor can be one of a pair of conductors similar to the other pair of conductors. A method is disclosed whereby the making tape can be electromagnetically traced with the position of the passive markers established. A method is also disclosed for determining the distance to a break in the tape which causes the pair of conductors to be severed.
REFERENCES:
patent: Re30393 (1980-09-01), Sherlock
patent: 3568626 (1971-03-01), Southworth
patent: 3633533 (1972-01-01), Allen
patent: 3718113 (1973-02-01), Schertler et al.
patent: 4119908 (1978-10-01), Cosman et al.
patent: 4151458 (1979-04-01), Seager
patent: 4625074 (1986-11-01), Cox
Cosman Armond D.
Minarovic Joe T.
Kirn Walter N.
Marben Robert L.
Minnesota Mining and Manufacturing Company
Sell Donald M.
Taylor Dennis L.
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