METHOD FOR ASSESSING THE DEPTH OF CRACKS ON THE SURFACE OF PIPES Russian patent published in 2022 - IPC G01N27/90 

FIELD: measuring equipment.

SUBSTANCE: invention is aimed to detect and assess the maximum depth of cracks. The essence of the invention lies in the fact that when assessing the depth of cracks on the surface of pipes, at the first stage, an assessment of the depth of cracks is carried out using an eddy current flaw detector equipped with an overhead eddy current converter (ECC) with an effective diameter of more than 10 mm, first a dynamic mode of operation of the eddy current flaw detector is established and operations are performed to detect defective areas on the surface of pipes, in the detected defective area zones are allocated with the maximum readings of the eddy current flaw detector, then the eddy current flaw detector is switched to static mode and crack depths are measured in the mentioned zones, after which preliminary ranking is carried out. To clarify the depth of cracks, magnetic powder flaw detection of the defective area is carried out. After that, the second stage of assessment is carried out, at which the depth of cracks is measured with an eddy current flaw detector equipped with an overhead ECC with an effective diameter of less than 3 mm and operating in static mode, and then additional ranking of cracks is carried out. Further assessment of the depth of cracks is carried out using an electrical potential crack depth meter, according to the measurements of which a control ranking is carried out. Then the assessment of the depth of cracks is carried out by the method for controlled grinding. If cracks requiring further assessment were identified at the second stage of the assessment and with their density of more than 4 crack units per 1 cm², the assessment is carried out by controlled grinding, excluding measurements with an electrical potential crack depth meter.

EFFECT: increased productivity and reliability of the assessment of the depth of cracks on the pipe surface.

1 cl, 1 dwg, 9 tbl