G - Physics – 08 – B
Patent
G - Physics
08
B
340/124.3
G08B 21/00 (2006.01) G01N 27/82 (2006.01)
Patent
CA 1184989
ABSTRACT OF THE DISCLOSURE Apparatus for detecting flaws in the threaded end of a ferromagnetic pipe is disclosed. The apparatus comprises means for applying a magnetic force to produce a field generally axially through the threaded end of the pipe, first and second means adjacent successive crests of a thread for sensing a generally radial magnetic field and generating a first and second signal corresponding to the sensed magnetic fields, and means for differentially connecting the signals generated by said first and second sensing means, whereby a differential output signal is produced in response to a flaw between the crests of the thread being inspected. The apparatus also comprises means for helically rotating said sensing means to follow a path corresponding to the threads of the pipe, whereby the first and second signals vary with time. A method for detecting flaws in the threaded end of g ferromagnetic pipe is also disclosed. The method comprises the steps of applying a magnetic force to produce a field generally axially through the threaded end of the pipe, sensing the radial magnetic field adjacent successive crests of a thread of the pipe, generating first and second signals corresponding to the sensed magnetic fields, and differentially connecting the first and second signals.
411533
Balter Floyd A.
Kusenberger Felix N.
Moyer Mark C.
Perry William D.
Petersen Clifford W.
Borden Ladner Gervais Llp
Exxon Production Research Company
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