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首页> 外文会议>Geothermal Resources Council Annual Meeting >Risk Based Inspection of a Turbine Inlet Steam Pipeline
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Risk Based Inspection of a Turbine Inlet Steam Pipeline

机译：基于风险的涡轮机入口蒸汽管道检查

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As part of a Risk Based Inspection demonstration project, a turbine inlet steam pipeline of a geothermal power plant was examined after 17 years of service. The work was sponsored by the New Zealand Government, as part of an Overseas Development Assistance, ASEAN Corrosion Project in the Philippines. Pits of up to 4.69 mm depth and 20 mm diameter, with an inverted cone shape, were observed in the 10 mm thick pipeline. Erosion corrosion was seen on susceptible elbows. The extent of the erosion was less than that of the pitting observed in the same proximity and was less than 1 to 2 mm deep. A defect assessment was completed on the deepest measured pit using AS/NZS 3788, and the pipe was shown to be acceptable for service with the observed pit depth. The apparent linear corrosion rate of 0.28 mm/year, with corrosion being due to wet aerated shutdown/standby/start-up conditions and 0.1 mm of pit depth growth per shutdown was considered excessive. A less conservative semi-parabolic pit depth growth rate was proposed. A remaining lifetime to failure according to the criteria for defect size in AS/NZS 3788 was calculated to be from 17 to 23 years giving a total life of up to 40 years. Corrosion products identified were typical of the predicted corrosion processes, i.e. passive film formation during on-line operation and aerated condensate corrosion at shutdown. Recommended changes in plant and procedures to achieve dry shutdown would extend the life indefinitely, for example up to 40 more years.
机译：作为风险基于风险的检查示范项目的一部分，在17年的服务后检查了地热发电厂的涡轮机入口蒸汽管道。该工作由新西兰政府赞助，作为海外发展援助的一部分，菲律宾东盟腐蚀项目。在10毫米厚的管道中观察到高达4.69毫米深度和倒置锥形的直径为20毫米的凹坑。在易感肘部看到腐蚀腐蚀。侵蚀的程度小于观察到在相同接近的点的程度小于1至2mm深。使用AS / NZS 3788在最深测量的凹坑上完成缺陷评估，并将管道与观察到的凹坑深度进行服务可接受。表观线性腐蚀速率为0.28毫米/年，腐蚀是由于湿润的停机停机/待机/启动条件，并且每次关闭的0.1毫米的坑深度增长被认为过度。提出了一种较少保守的半抛物坑深度生长速率。根据AS / NZS 3788的缺陷尺寸标准的剩余寿命计算为17至23年，总使用寿命长达40岁。鉴定的腐蚀产物是典型的预测腐蚀过程，即在线运行期间的被动膜形成和关闭的曝气冷凝水腐蚀。植物和程序的推荐变化达到干洗会无限期地将生命延伸，例如长达40年。

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