Study on burst pressure of subsea pipelines with asymmetrical corrosion defects

Abstract

As an efficient and inexpensive tool, pipelines are widely used in the transportation of hydrogen, carbon dioxide, oil and gas. The subsea pipelines are inevitably corroded because of the transportation environment and medium. The scholars have studied burst pressure of pipelines with simple corrosion defects, However, there are many research gaps in the burst pressure analysis of pipelines with complex corrosion defects. In this paper, the burst pressure of subsea pipelines with asymmetrical corrosion defects is studied. Firstly, a model of pipelines with asymmetrical and external corrosion defects is established. Then, the finite element method is conducted to analyze the burst capability of subsea pipelines with asymmetrical corrosion defects. Next, a novel method of simplifying asymmetrical corrosion defects is proposed. In the end, a modified DNV equation is presented to predict the burst pressure of subsea pipelines with asymmetrical corrosion defects. This study can provide a novel idea for obtaining the burst pressure of subsea pipelines with complex corrosion defects.