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In addition to requirements derived from the preceding analytical considerations and regulatory demands mentioned in the OGE July issue, some other aspects have to be considered for the conceptual design of a geometry inspection tool.
The present paper substantiates 100 percent practicability of inspecting lined tubing with protective bushing by magnetic examination, utilizing in-tube magnetic detectors. Results of bench tests on driving a magnetic shell-type detector in a pipe coil with welded joint and protective bushing and artificial defects are presented below.