西气东输二线站场收发球筒位移原因及解决方案

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英文篇名：Causes and solution for displacements of pig launchers and receivers in stations along 2nd West-to-East Gas Pipeline 作者：倪姗姗 ; 黄冬 ; 胡开胜 ; 崔祥 英文作者：NI Shanshan;HUANG Dong;HU Kaisheng;CUI Xiang;Petro China West Pipeline Company; 关键词：西气东输二线 ; 收发球筒 ; 位移 ; 应力分析 ; 风险控制 英文关键词：2nd West-to-East Gas Pipeline,pig launcher and receiver,displacement,stress analysis,risk control 中文刊名：YQCY 英文刊名：Oil & Gas Storage and Transportation 机构：中国石油西部管道公司; 出版日期：2015-09-10 16:11 出版单位：油气储运 年：2015 期：v.34;No.323 语种：中文; 页：YQCY201511024 页数：5 CN：11 ISSN：13-1093/TE 分类号：117-121

摘要

由于温度、土壤压实系数的差异以及管道基础沉降等所产生的各种外力作用,高压力、大口径天然气管道中间压气站的收发球筒和进出站截断阀在日常运行中容易出现位移。通过应力分析模型,选取应力分析参数,进行应力核算,并结合沿线各站场气象条件和地质情况,分析得出收发球筒和进出站截断阀发生位移的原因是:设计阶段应力分析计算选取的环境温度、土壤压实系数与施工过程中实际情况偏差较大,同时部分站场厂区埋地管道存在沉降现象也加大了管道的弯矩和所承受的应力。基于此,提出了有针对性的解决方案:采取支架与管道焊接和环氧砂浆灌浆料浇筑加固的治理措施,通过实施整改,取得了较好的效果,西气东输二线现场位移风险得到了控制。
        External forces generated due to differences in temperatures and soil compaction coefficients, together with those generated by foundation settlements, may induce displacements of pig launchers, receivers and block valves in intermediate gas compressor stations along high-pressure, large-diameter gas pipelines during routine operation. With the stress analysis model, appropriate parameters are selected for stress calculation. Moreover, with consideration to meteorological and geologic conditions in stations along the pipeline, analysis is made, obtaining that such displacements are caused by following aspects.(1) significant deviations exist between the environmental temperatures and soil compaction coefficients selected for stress analysis in the design stage and those encountered on sites, and(2) settlements of underground pipelines in some stations increase bending moments and stresses on relative buried pipelines. Accordingly, specific solution is proposed, namely, brackets and pipeline are welded with reinforcement with epoxy mortars. These transformation measures have achieved satisfactory performance. Risks related to displacement of the 2nd West-to-East Gas Pipeline have been controlled effectively.

引文

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