MAGNETIC GOING-THROUGH FLAW DETECTOR Russian patent published in 2001 - IPC

FIELD: intrapipe diagnostics of pipe-lines transporting natural and commercial gases, oil and oil products. SUBSTANCE: conical sealing ring is placed in nose part of body of flaw detector. At least one driving elastic collar contacting internal surface of pipe-line is installed in front of conical sealing ring. External surface of conical sealing ring forms side surface of cylinder and side surface of cone bordering on it. Diameter of formed surface of cylinder does not exceed 0.98 outer diameter of pipe-line, generating line of above-mentioned surface of cone forms angle of not more than 60 degrees with main axis of pipe-line. Holes through which space of transported medium in front of conical sealing ring communicates with space after conical sealing ring are made in conical sealing ring and/or in body of flaw detector. EFFECT: design of flaw detector enables stability of measurement to be raised thanks to smoothing of jerks in movement of flaw detector, gradients of pressure and temperature emerging with passage of flaws in pipe protruding inwards in pipe-line to be reduced. 10 cl, 8 dwg