Apparatus for nondestructive testing of subsurface piping using

Details Apparatus for nondestructive testing of subsurface piping using Apparatus for nondestructive testing of subsurface piping using

1985-12-04

1987-12-01

Eisenzopf, Reinhard J.

Electricity: measuring and testing

Magnetic

Magnetic sensor within material

324232, 324346, G01N 2772, G01N 2782, G01R 3312

Patent

active

047107111

ABSTRACT:
Method and apparatus for nondestructive inspection of oilfield piping includes first and second elongated nonmagnetic housing members having an elongated magnetic core therebetween. A first coil assembly for emitting a unidirectional flux field is coupled to the core member. Detector shoes are coupled to said core member proximate the first coil assembly and are based into contact with the interior surface of the piping. Second and third coil assemblies are coupled to the core member for emitting unidirectional fields in opposition to the field emitted from the first coil assembly.

REFERENCES:
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patent: 3315154 (1967-04-01), Nuttall
patent: 3393732 (1968-07-01), Murphy, Jr. et al.
patent: 3437810 (1969-04-01), Wood et al.
patent: 3449662 (1969-10-01), Wood
patent: 3543144 (1970-11-01), Walters et al.
patent: 3899734 (1975-08-01), Beaver et al.
patent: 3940689 (1976-02-01), Johnson, Jr.
patent: 4320340 (1982-03-01), Lichtenberg

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