Burst Pressure Prediction of Subsea Supercritical CO<sub>2</sub> Pipelines
Yan Li,
Wen Wang,
Zhanfeng Chen,
Weipeng Chu,
Huijie Wang,
He Yang,
Chuanyong Wang,
Yuxing Li
Affiliations
Yan Li
School of Mechanical Engineering, Hangzhou Dianzi University, Hangzhou 310018, China
Wen Wang
School of Mechanical Engineering, Hangzhou Dianzi University, Hangzhou 310018, China
Zhanfeng Chen
School of Mechanical Engineering, Hangzhou Dianzi University, Hangzhou 310018, China
Weipeng Chu
School of Mechanical Engineering, Hangzhou Dianzi University, Hangzhou 310018, China
Huijie Wang
School of Mechanical Engineering, Hangzhou Dianzi University, Hangzhou 310018, China
He Yang
School of Mechanical Engineering, Hangzhou Dianzi University, Hangzhou 310018, China
Chuanyong Wang
School of Mechanical Engineering, Hangzhou Dianzi University, Hangzhou 310018, China
Yuxing Li
Provincial Key Laboratory of Oil and Gas Storage and Transportation Safety in Shandong Province, China University of Petroleum (Huadong), Qingdao 266580, China
To improve transportation efficiency, a supercritical CO2 pipeline is the best choice for large-scale and long-distance transportation inshore and offshore. However, corrosion of the pipe wall will occur as a result of the presence of free water and other impurities present during CO2 capture. Defects caused by corrosion can reduce pipe strength and result in pipe failure. In this paper, the burst pressure of subsea supercritical CO2 pipelines under high pressure is investigated. First, a mechanical model of corroded CO2 pipelines is established. Then, using the unified strength theory (UST), a new burst pressure equation for subsea supercritical CO2 pipelines is derived. Next, analysis of the material’s intermediate principal stress parameters is conducted. Lastly, the accuracy of the burst pressure equation of subsea supercritical CO2 pipelines is proven to meet the engineering requirement by experimental data. The results indicate that the parameter b of UST plays a significant role in determining burst pressure of pipelines. The study can provide a theoretical basis and reference for the design of subsea supercritical CO2 pipelines.
