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The elastic plate 37 is made and contains multi-layers of rubberized fabric made of polymer and metallic threads. These layers are perpendicular to the plane through the axle housing 11. On the surface of an elastic plate 37 c the front of the flaw with a hard metal plate 38. Leaf springs 39, 40 are rigidly fixed to the ring 32 and run into the sensor module 12 from the axis of the housing 11. In the claimed flaw each bar is connected to the housing only flaw with a lever connected to the front of the bar, back bar is located between the guide elements and is capable of radiating move.

The springs are installed between adjacent bars and provide a clamping bars to the inside surface of the pipeline. Unlike magnetic flaw inspection of NGKS GB2376077 radial mobility of the bars provides a cross-over restriction, regardless of the length of the pipeline sticks brushes. In contrast to the flaw Pipetronix GmbH on US 6,196,075 mobility independent front and rear of the bar provides the ability to rounding dents pipeline control stations adjacent to the dent. In contrast to the flaw PII Ltd. on US 6,538,431 in the collision bar claimed flaw with an obstacle inside the pipe bar moves freely relative to the body flaw in the opposite direction of the flaw. Lever, which connects the front of the bar with the body of the flaw detector, provides a radial displacement of the front of the bar in the direction of the body flaw.

This movement provides a bar bending around obstacles. Information sources used: 1. Tevrjukov et al. – Patent of Great Britain No. 2376077. 2. Comello et al. – US Patent No. 6,196,075. 3. Couchman et al. – US Patent No. 6,538,431. Authors Vitaly Davydov, Vladimir Shchukin, Bogdan Case Company 'Neftegazkomplektservis', a division of Weatherford February 11, 2009 (C) UAB "Neftegazkomplektservis', a division of Weatherford, 2009