Electricity: measuring and testing – Magnetic – Magnetic sensor within material
Patent
1993-11-17
1995-12-05
Snow, Walter E.
Electricity: measuring and testing
Magnetic
Magnetic sensor within material
G01N 2772, G01N 2782, G01R 3300
Patent
active
054732468
ABSTRACT:
Apparatus for detecting a discontinuity in a pipe and for supplying a sealant to seal the discontinuity so detected. The apparatus includes a circuit means for generating an electrical drive current, a sonde having a body with a transmitting coil to be subjected to the drive current and adapted to induce a magnetic field in two adjacent portions of the pipeline, and receiving coils adapted to have induced therein voltages from the portions and to provide a signal when the magnetic field in one portion of the pipeline differs from that in the other portion of the pipeline due to the fact that the discontinuity lies in the vicinity of one or other of the portions and means for detecting the signal. The sonde body has a surface at which there terminates at least one sealing compound jetting nozzle drillings extending through the body and circumferentially around the sonde body. The at least one nozzle drillings is connected to a sealing compound supply pipe whereby on detecting the discontinuity the compound can be supplied to the at least one nozzle drillings to seal the discontinuity.
REFERENCES:
patent: 3361960 (1968-01-01), Renken, Jr.
patent: 3434046 (1969-03-01), Wilson et al.
patent: 4178875 (1979-12-01), Moschetti
patent: 4814702 (1989-03-01), Driggers et al.
patent: 5302895 (1994-04-01), Philpot
British Gas plc
Snow Walter E.
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