METHOD FOR CYCLIC HYDRAULIC TESTING OF DEFECTIVE PIPE SECTIONS AND BENCH FOR ITS IMPLEMENTATION Russian patent published in 2023 - IPC G01M3/28 

FIELD: testing equipment.

SUBSTANCE: installations for hydraulic testing of pipeline elements with assessment of the degree of danger of existing metal defects and welded joints of pipes. The method includes filling the test product with working fluid, bleeding the air, connecting and crimping the injection and filling loop, supplying fluid to gradually increase the pressure to working pressure, and holding the product under pressure for 30 seconds. As a test product, pipe sections with the types of defects required for testing are cut out from an existing gas pipeline, connected by welding into a single pipe string, the pipe string is installed on the base of the stand with an inclination towards the valve for bleeding air, and buffer pipes with plugs are welded onto the pipe string. In this case, the operation of the pipe section is simulated by a cyclic change in pressure ranging from atmospheric to the operating pressure of the gas pipeline, a cyclic change in pressure within the range of up to 10% of the operating pressure, with exposure to moments when pressure extremes are reached. The stand includes a high-pressure pump, a pressure gauge, a relief safety valve, an electromagnetic pressure relief valve, connected through cables and ball valves to a container for the working fluid and the workpiece being tested, two pressure sensors and a ball valve. In this case, the high-pressure pump, two ball valves and an electromagnetic pressure relief valve are connected by communication lines through a programmable logic controller with a control panel, which contains a base, holding devices, buffer pipes with plugs, acoustic emission and strain gauge sensors connected by communication lines to the programmable logic controller, while the control panel is stationary and connected to the workpiece under test via communication lines through a programmable logic controller.

EFFECT: increasing the accuracy and reliability of the method for cyclic hydraulic testing of defective pipe sections.

3 cl, 1 dwg, 3 ex, 3 tbl