Transactions of Materials and Heat Treatment

Title：Study on rebound coefficient of long distance pipeline sag based on FEM

Authors： Lyu Yafeng Ma Tingxia Zou Haixiang Liu Weiyang

Unit： Southwest Petroleum University Qinghai Oilfield Golmud Refinery

KeyWords： pipeline sag rebound coefficient finite element method regression analysis security assessment

ClassificationCode：TE973

year,vol(issue):pagenumber：2017,42(4):194-200

Abstract：

At present, the empirical formula is often used to estimate the sag depth after unloading inner pressure, while there is no formula for that after unloading external load. Therefore, based on the common steel pipeline X52, X60 and X70 as the engineering backgrounds, the nonlinear analysis of the pipeline structure mechanics was carried out by ABAQUS software, and the forming and rebound processes of pipeline sag were simulated numerically. Then, the reliability of the finite element simulation method was verified by comparing experimental data with the numerical simulation data, and the influences of various parameters (loading depth, pressure head size, pipe size, operating pressure and pipe properties) on the rebound coefficient of sag after unloading external load and inner pressure were analyzed respectively. Furthermore, the nonlinear regression analysis on the calculated results was carried out by Matlab software, and the relationship between rebound coefficient and parameters was obtained. The results show that the rebound coefficient of sag has wide variation range of 0.4-0.8 under the external load, and it is relatively small of 1.05-1.3 after unloading inner pressure. The conclusion is helpful for the pipeline maintenance personnel to make a reasonable estimate on the sag rebound.

Funds：

吕亚峰（1991-），男，硕士研究生 E-mail：435404611@qq.com 通讯作者：马廷霞（1974-），女，博士，副教授 E-mail：823761506@qq.com

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