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首页> 外文会议>ASME international pipeline conference 2008 >EXTENDING THE IN-LINE INSPECTION INTERVAL FOR A GAS PIPELINE USING DIRECT ASSESSMENT
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EXTENDING THE IN-LINE INSPECTION INTERVAL FOR A GAS PIPELINE USING DIRECT ASSESSMENT

机译：使用直接评估扩展天然气管道的在线检查间隔

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RWE npower own and operate a 12km long 8" diameter natural gas pipeline that supplies natural gas from the National Transmission System (NTS) to a CHP unit. The pipeline has a nominal wall thickness of 6.35mm, is constructed from API 51 X42 grade steel and has a maximum operating pressure of 75barg. The pipeline was commissioned about 8 years ago and has been operating safely since that time.rnThe pipeline was designed in accordance with BS 8010 Parts 1 and 2, with consideration given to the Institute of Gas Engineers Recommendations, IGE/TD/1, IGE/TD/9 and IGE/TD/12. One of the requirements of IGE/TD/1 is that the time interval between in-line inspections should not normally exceed 10 years. However, IGE/TD/1 Edition 4 allows the time interval to be exceeded if justification can be demonstrated using risk based techniques.rnFor older pipelines it is often possible to determine the required time dependent failure probability based on the results of previous ILIs. This allows the time to next ILI to be determined. This time will depend on what has been found previously and values of other pipeline parameters. However, in the case of this pipeline there are no previous ILI data.rnIn view of the above a probabilistic approach to External Corrosion Direct Assessment (ECDA) was adopted. The method makes use of the results from the above ground surveys rather than ILI data. However, in this instance, rather than being used to determine the time interval to the next above ground survey the method was used to determine the time interval to the next (first) ILI.rnThe method is based on structural reliability analysis (SRA) which is used to determine the time dependent probability of failure based on available data.rnIn view of the quantity and quality of the available above ground survey data it was possible to use the method to extend the time to the next ILL by several years.
机译：RWE npower拥有并经营着一条长12公里，直径8英寸的天然气管道，该管道将来自国家传输系统（NTS）的天然气供应到CHP装置。该管道的标称壁厚为6.35mm，由API 51 X42级钢制成该管道的最大工作压力为75barg。该管道大约在8年前投入使用，自那时以来一直安全运行。该管道是根据BS 8010第1部分和第2部分进行设计的，并考虑了气体工程师协会的建议，IGE / TD / 1，IGE / TD / 9和IGE / TD /12。IGE/ TD / 1的要求之一是，在线检查之间的时间间隔通常不应超过10年。如果可以使用基于风险的技术证明合理性，则TD / 1第4版允许超过时间间隔。对于较旧的管道，通常可以根据以前的ILI的结果确定所需的时间相关的故障概率。 o下一个需要确定的ILI。该时间将取决于先前发现的内容以及其他管道参数的值。但是，在该管道的情况下，以前没有ILI数据。鉴于上述情况，采用了概率方法进行外部腐蚀直接评估（ECDA）。该方法利用了地面调查的结果，而不是ILI数据。但是，在这种情况下，该方法不是用于确定到下一个（第一个）ILI的时间间隔，而是用于确定到下一个（第一个）ILI的时间间隔。rn该方法基于结构可靠性分析（SRA），考虑到可用的地面数据的数量和质量，考虑到可用的数据的时间和概率，考虑到可用的地面调查数据的数量和质量，可以使用该方法将下一次ILL的时间延长几年。

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