• CN:11-2187/TH
  • ISSN:0577-6686

机械工程学报 ›› 2017, Vol. 53 ›› Issue (12): 19-27.doi: 10.3901/JME.2017.12.019

• 承压设备的无损检测与评价 • 上一篇    下一篇

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长输油气管道弱磁应力内检测技术

闵希华1, 杨理践2, 王国庆2, 饶心1, 刘斌2   

  1. 1. 中国石油天然气股份有限公司西部管道分公司 乌鲁木齐 830000;
    2. 沈阳工业大学信息科学与工程学院 沈阳 110870
  • 出版日期:2017-06-20 发布日期:2017-06-20
  • 作者简介:

    闵希华,男,1959年出生,教授级高级工程师。主要研究方向为油气管道工程建设与运营管理技术。

    E-mail:minxih@cnpc.com.cn

    王国庆(通信作者),男,1980年出生,博士研究生。主要研究方向为油气管道应力检测技术及相关理论、无损检测技术。

    E-mail:wangguoqing100110@163.com

  • 基金资助:
    * 科技部国家重大仪表专项(2012YQ090175)、国家自然科学基金(61571308)和辽宁省教育厅科学研究(L2016009)资助项目; 20161205收到初稿,20170220收到修改稿;

Weak Magnetism Stress Internal Testing Technology of the Long Distance Oil-gas Pipeline

MIN Xihua1, YANG Lijian2, WANG Guoqing2, RAO Xin1, LIU Bin2   

  1. 1. Western Pipeline Branch Company, PetroChina Company Limited, Urumqi 830000;
    2. School of Information Science and Engineering, Shenyang University of Technology, Shenyang 110870
  • Online:2017-06-20 Published:2017-06-20

摘要:

应力集中是导致油气管道发生破坏的重要原因,它的存在给管道的安全运行带来风险。针对油气管道的应力在线检测及风险评价,提出弱磁应力内检测技术。对弱磁信号产生的原因进行分析,利用基于第一性原理的材料仿真软件对铁磁材料在受力过程中的弱磁效应进行计算。提出管道差异运行压力下二次弱磁内检测法,给出油气管道应力集中程度的评价方法。自主研发高精度弱磁应力内检测装置并在实际管道中进行应用,实现长输管道应力集中的在线内检测及风险评价。利用各种检测手段对检测结果进行现场验证。结果表明:弱磁信号的产生与应力及其损伤状态直接相关。应力作用根本上导致原子磁矩变化,宏观表现为弱磁信号随应力的变化而变化。管道差异运行压力二次弱磁内检测可以准确评价管道应力集中风险程度。工程实际应用及开挖验证表明了管道弱磁应力内检测技术的可行性及有效性。

关键词: 风险评价, 弱磁, 应力内检测, 油气管道

Abstract:

Stress concentration is the key factor which induces the damage of oil-gas pipeline. It brings the risk to the safety of pipeline. Point at online stress testing and risk evaluation, weak magnetism stress internal testing technology is put forward. The reason for formation of weak magnetic signal is analyzed. The weak magnetic effect of ferromagnetic material under different stress is simulated by simulation software which is based on first principle. Twice weak magnetism stress internal testing method under different run pressures is put forward. Risk evaluation method of oil-gas pipeline stress concentration is provided. Highly sensitive weak magnetism stress internal testing equipment which is independently researched and developed is applied in actual pipeline. Online internal testing and risk evaluation of the long distance pipeline are achieved. The testing result is validated through different testing method. The results show that the formation of weak magnetic signal is related to stress and stress damage. Stress induces atomic magnetic moment change. Weak magnetic signal change with stress macroscopically. Twice weak magnetism stress internal testing method under different run pressures can accurately evaluate stress concentration risk level of pipeline. Actual engineering application and excavation testing results indicate that weak magnetism stress internal testing technology is feasible and effective.

Key words: risk evaluation, stress internal testing, weak magnetism, oil-gas pipeline