MAGNETIC INTROSCOPE TO TEST GAS LINES WITHOUT STRIPPING PROTECTIVE INSULATION Russian patent published in 2002 - IPC

FIELD: non-destructive inspection, flaw detection in oil and gas pipe-lines and other pipe-line structures. SUBSTANCE: introscope includes mobile magnetized device put of wheels. Device carries scanning converter of magnetic field, scale-time converter and video-control terminal. Introscope has framework over which magnetizing unit travels. Framework is manufactured from guides coupled on butts with braces. Framework is placed on surface of introscope thanks to forces of attraction of magnetizing unit and of permanent magnets made fast to braces of framework. Technical result of travel of magnetizing unit and scanning converter located between its poles over framework consists in maintenance of constant clearance between converter and tested surface which does not depend on changes of thickness of insulation and leads to increased accuracy of flaw detection. EFFECT: increased accuracy of law detection. 5 cl, 4 dwg