Corrosion Defect Assessment and Maintenance Decision-Making of a Gas Transmission Pipeline
摘 要
针对某输气管道内检测数据中腐蚀缺陷,进行缺陷尺寸特征与环焊缝关系等统计分析。考虑组合缺陷影响、环焊缝影响、缺陷特征等因素,制定缺陷维修判定准则;结合缺陷剩余强度评价、剩余寿命预测和综合因素分析,确定缺陷维修决策,并提出管道下一次检测时间建议。结果表明:管道剩余强度评价结果显示预估维修比(ERF)最大为0.578,满足承压能力需求;存在3处缺陷需立即修复,18处缺陷需一年内修复,建议在2023年再次开展内检测。此外,建议严格控制输送介质的质量并提高清管频次和质量。
Abstract
Based on in-line inspection data, a statistical analysis on relationship of defect size feature and girth weld was performed for a gas transmission pipeline. Maintenance judgement criteria were formulated by considering factors including interacting defects, girth weld influence and defects features. Maintenance decisions were made for defects by combining residual strength assessment, remaining life prediction and composite factors analysis, and the time for next inspection was proposed. It was shown that the residual strength assessment results exhibited that the maximum ERF (esmated repair factor) for corroded pipeline was 0.578 and fitted for loading capacity, but 3 defects should be fixed immediately and 18 defects shouled be repaired within one year. The suggestion was given to implement a re-inspection in 2023. Moreover, gas quality should be controlled strictly, pigging frequency and quality should be increased.
中图分类号 X924.3 DOI 10.11973/fsyfh-201909012
所属栏目 应用技术
基金项目 国家重点研发计划课题(2017YFF0210404);中国石油化工集团公司资助项目(CLY18053)
收稿日期 2019/4/15
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引用该论文: CUI Kaiyan,YAN Maocheng,WANG Xiaolin,LI Ming. Corrosion Defect Assessment and Maintenance Decision-Making of a Gas Transmission Pipeline[J]. Corrosion & Protection, 2019, 40(9): 682
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【2】帅健,张春娥,陈福来.腐蚀管道剩余强度评价方法的对比研究.天然气工业,2006,26(11):122-125.
【3】中国石油管道公司.油气管道完整性管理技术.北京:石油工业出版社,2010:85.
【4】崔凯燕,王晓霖,董列武,等.管道腐蚀缺陷的安全维修时限的确定方法和装置:中国,CN201610798888.7.2018-03-13.
【5】范晓勇,胡军,陈碧,等.含组合腐蚀缺陷管线剩余强度分析及寿命预测.榆林学院学报,2016,26(2):6-9.
【6】马欣,李杰,薛涛,等.含内腐蚀凹陷的压力管道应力应变研究.塑性工程学报,2018,25(3):267-273.
【7】孙晋美,崔晓玉.ф219 mm×10.5 mm弯管环焊缝穿孔失效分析.理化检验(物理分册),2017,53(4):299-301.
【8】SY/T 6151-2009.钢质管道管体腐蚀损伤评价方法.
【9】ASME B31G-2012. Manual for determining the remaining strength of corroded pipelines.
【10】API RP 1160-2013. Managing system integrity for hazardous liquid pipelines.
【11】ASME B31.8S-2014. Managing system integrity of gas pipeline.
【12】SY/T6996-2014.钢质油气管道凹陷评价方法.
【13】BS 7910-2013. Guidance to methods of assessing the acceptability of flaws in metallic structure.
【14】DNV RP F101-2015. Recommended practice F101:corroded pipelines.
【15】NACE SP0502-2010. Pipeline external corrosion direct assessment methodology.
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