FIELD: gas and oil pipe line transport; nondestructive testing of pipe lines in operation and at test rigs. SUBSTANCE: pressure differential is created in section of pipe line under test by moving the device through pipe line located in fluid medium. Pressure differential is created due to lesser cross section of device housing as compared with section of pipe line and due to circular slot between inner surface of pipe line and outer surface of device housing for flow of fluid medium. EFFECT: enhanced efficiency. 1 dwg
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