IN-PIPE POST-CONSTRUCTION DIAGNOSTICS METHOD OF PIPELINE AND DEVICE FOR IMPLEMENTATION THEREOF Russian patent published in 2020 - IPC F17D5/00 

FIELD: construction; transportation.

SUBSTANCE: invention relates to pipeline transport and can be used after completion of construction and installation works during construction of pipeline before its commissioning. Method of in-pipe post-construction diagnostics of pipeline, including use of in-pipe inspection device and provision of its movement in cavity of pipeline under action of compressed air, enabling the in-pipe inspection device movement in the inert gas medium by the cavities formation, limited by the pistons installed on both sides of the in-line inspection instrument and fixed by the connecting elements at the design distance l, wherein pressure values in these cavities p_1.1 and p_2.1 exceed the pressure values of adjacent areas p₁ and p₂. Distance between in-pipe inspection device and pistons is taken from condition of provision of gap between connection element and inner surface of pipeline on its curvilinear sections. In device for in-pipe post-construction diagnostics of pipeline containing in-pipe inspection device, in-pipe inspection device is equipped with built-in cylinder with compressed inert gas and connected to pistons by means of connecting elements. Pistons forming cavities with compressed inert gas are made sectional and interconnected by short connecting elements with length of 0.5–1.0 m. Besides, in-pipe inspection device with pistons and sections in pistons are interconnected through ball hinge.

EFFECT: invention provides elimination of fire during post-construction diagnostics of pipeline.

5 cl, 4 dwg