Restoration of the Serviceability of Defective Sections of Oil and Gas Pipelines Using the Magnetic-Pulse Method

Abstract

Abstract The analysis of emergency situations on the main pipelines is presented, as a result of which it was found that the occurrence of fatigue microcracks and their growth under load is one of the main causes of accidents, which indicates the danger of defects of this type and the need to eliminate them at an early stage. The article discusses a method for healing fatigue cracks in oil and gas pipelines using magnetic pulse processing of metals MPP. The composition of the magnetic-pulse unit MPU and the principle of its operation are described in detail. The principle of operation of this method is based on the induction of eddy currents in the processed metal using a magnetic-pulse unit MPU. The induced currents cause thermo-mechanical processes in the vicinity of the cracks, which lead to the closing of the edges of the cracks and the prevention of their growth. The tests were carried out using two groups of samples from steel 17G1S, One of them was processed by magnetic pulse. Then both groups were tested for impact strength. The test results showed a significant increase in toughness for samples processed with magnetic pulse compared to unprocessed samples.