Study on Tensile Magnetic Memory Performance of Self-installed Wellhead Offshore Pipeline

Abstract

Abstract: In order to study the variation of magnetic field signals on the surface of X80 steel during the fatigue tensile process of subsea pipelines transporting from self-installed wellhead platform under geomagnetic excitation,the fatigue tensile test of X80 steel samples under different loads was carried out using MTS810 250 fatigue tensile tester. During the experiment,the change of magnetic memory signal on the surface of the tensile samples was monitored by magnetic memory sensor,the fatigue failure of the samples was observed by hand-held microscope,and the fracture surface after fracture was analyzed by SEM. The results show that magnetic memory is sensitive to tensile fatigue damage,and a new testing parameter system of magnetic memory for X80 steel is proposed,in which the connecting line slope of the extremum of tangential signal and tangential gradient signal is taken as the characteristic value,it lays a foundation for the field application of magnetic memory testing method.

Key words: self-installed wellhead platform, offshore pipeline, tensile fatigue, X80 steel, magnetic memory, characteristic parameters

CLC Number:

TE832

GU Wei. Study on Tensile Magnetic Memory Performance of Self-installed Wellhead Offshore Pipeline[J]. TIANJIN SCIENCE & TECHNOLOGY, 2023, 50(2): 24-30.

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