Truss-type maintenance devices and corresponding pipeline lifting control strategies

• 作者: Tian-Feng Zhao Qing-Yuan Zhang Gui Chu
• 来源期刊: 石油科学（英文版）
• 年，卷（期）: 2021,（3）
• 所属期刊栏目: PETROLEUM ENGINEERING & MECHANICS
• 页码范围: 939-950
• 页数: 12页
• 语种: 英文

摘要

For new submarine pipeline maintenance lifting equipment,a specialized analysis model is constructed in this study.A pipeline can be divided into the lifted portion and the touch-down portion that lies on the seabed,and each of these portions can be analyzed separately by converting the continuity conditions at the touch-down points to boundary conditions.The typical two-point sequence secant iterative technique is used to obtain the unknown lifted length and determine pipeline lift-ing configurations.The BVP4C module in MATLAB software is used to solve this multiple-point boundary value problem issued from first-order differential equations.Also,the triple-point lifting mode of truncated maintenance and the two-point lifting mode of online maintenance are discussed.When the lifted heights at truss positions are shown,the lifting deforma-tion,lifting forces,bending moment distribution,and axial force distribution can be analyzed using a dedicated analysis program.Numerical results can then be used to design a lifting strategy to protect the pipeline.