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首页> 外文会议>International Conference on Global Trends in Joining, Cutting and Surfacing Technology >Health Assessment, Development of Repair Methodology and Repairing of Cracks in Aged Coke Chambers of Delayed Coker Unit (DCU) Caused by Low Cycle Thermal Fatigue Phenomenon
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Health Assessment, Development of Repair Methodology and Repairing of Cracks in Aged Coke Chambers of Delayed Coker Unit (DCU) Caused by Low Cycle Thermal Fatigue Phenomenon

机译：健康评估，在低循环热疲劳现象造成的延迟焦科单位（DCU）老化焦室修复方法和修复裂缝的发展

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摘要

Mechanical equipments are designed for a definite life which is decided at the design stage itself. Operating beyond the design life calls for a comprehensive health assessment programs using the latest inspection techniques and advanced NDT methods. The coke chambers in a DCU undergo cyclic thermal stresses during the coking and decoking operation every 48 hours leading to development of cracks by thermal fatigue phenomenon. The surface cracks of the coke chambers skirt to shell weld joints were inspected using the WFMPT (wet fluorescent magnetic particle testing), DP testing methods. PA-UT (Phased Array Ultrasonic Testing) was used to detect any subsurface defects. The detected discontinuities were repaired in-house by developing repair methodology and implementing this repair methodology successfully for safe operation of the coke chambers.
机译：机械设备专为确定阶段本身决定的明确寿命而设计。使用最新的检查技术和高级NDT方法，以超越设计寿命要求全面的健康评估计划。每48小时，DCU中的焦室在焦化期间经历循环热应力，导致热疲劳现象开发裂缝。使用WFMPT（湿荧光磁性粒子试验），DP测试方法检查焦炭室裙部的焦炭室裙部的表面裂缝。 PA-UT（相控阵超声波测试）用于检测任何地下缺陷。通过开发修复方法和实现这种修复方法，成功地修复了检测到的不连续性以进行焦室的安全操作。

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