FIELD: acoustic non- destruction flaw detection methods. SUBSTANCE: apparatus allows to enhance reliability of testing due to mounting piezoelectric transducers in each acoustic unit in such a way, that one of piezoelectric transducers is shifted relative to the others, and due to provision of each acoustic unit by an additional circuit for automatic gain control, allowing to compensate attenuation in a deposit layer on an inner surface of the pipeline. EFFECT: increased accuracy. 1 cl, 2 dwg
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