发明名称 |
METHOD AND APPARATUS FOR DETECTING FLAWS IN THE THREADED END OF A PIPE |
摘要 |
<p>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.</p> |
申请公布号 |
CA1184989(A) |
申请公布日期 |
1985.04.02 |
申请号 |
CA19820411533 |
申请日期 |
1982.09.16 |
申请人 |
EXXON PRODUCTION RESEARCH COMPANY |
发明人 |
KUSENBERGER, FELIX N.;PERRY, WILLIAM D.;BALTER, FLOYD A.;TELLER, CECIL M., II;MOYER, MARK C.;PETERSEN, CLIFFORD W. |
分类号 |
G01N27/82;(IPC1-7):G08B21/00 |
主分类号 |
G01N27/82 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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