METHOD FOR IN-PIPE DIAGNOSTICS OF PIPELINE TECHNICAL STATE Russian patent published in 2019 - IPC G01N29/04 G01N27/82 

FIELD: defectoscopy.

SUBSTANCE: use: for in-pipe diagnostics of pipeline technical condition. Method comprises movement inside the pipeline between the inspection hatches under pressure of the device transported via the pipeline, which is a split housing of a spherical shape with magnetic field sensors placed inside it, temperature and pressure and acoustic sensors, accelerometers and a device for recording data measured by sensors, wherein device includes a power supply and a clock frequency generator, wherein acoustic emission sensors are configured to receive emission signals in the sound and supersonic frequency regions, as magnetic field sensors there used are not less than fourteen single-component constant magnetic field sensors uniformly and symmetrically located along the inner surface of the housing so as to provide a high degree of their mutual alignment, prior to measurement, iterative high-precision calibration of device is performed, which ensures coaxiality of symmetric single-component sensors, measuring at least 14 magnetic induction components of said field at different points of the in-tube space, from which at least 7 gradients of magnetic induction of pipe inner field are calculated, measuring at least two parameters of the field of acoustic emission and temperature of the heat field and pressure of the transported liquid at different points of the in-tube space; calculating the diagnostic parameters of the pipeline based on the obtained data.

EFFECT: high accuracy and reliability of detecting and assessing the risk of defects, location and geometric dimensions of the defect, including corrosion zones, detecting and identifying abnormalities of transverse welds, including destructed welds, detecting and determining location of pipeline accessories and fittings, repair structures of pipeline, and possibility of using proposed method on ferromagnetic and plastic pipes.

5 cl, 2 dwg