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DEVELOPMENT OF VIBRATION ASSESSMENT AND SCREENING METHODS FOR ATTACHMENTS TO PIPELINE SYSTEMS

机译：对管道系统附件的振动评估和筛选方法的开发

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Pipeline systems incorporate numerous welded small bore attachments such as instrument connections or stabbings, vent and drain points and bypasses around full bore valves. These are susceptible to fatigue failure due to high frequency vibration excited both through the structure and by pressure fluctuations in the gas. Three examples of such fatigue failures are presented, showing that there may be several vulnerable welds in a connection. Detailed modelling of the potential consequences of the releases from such failures suggest that there may be situations in which unacceptable hazards may arise. Hence methods are described for rapid measurement of stresses in attachments, one based on accelerometers and the second on a frictional strain gauge system. Results from field measurements show how a simple screening criterion has been developed using established fatigue design methods to assess the results and identify cases requiring urgent action.
机译：管道系统包括众多焊接的小孔附件，例如仪器连接或刺刺，排气口和排水点，并绕过全孔阀。由于通过结构和气体中的压力波动激发了高频振动，这些易受疲劳失效的影响。提出了这种疲劳失败的三个例子，示出了在连接中可能存在若干易受攻击的焊缝。从这些失败的释放潜在后果的详细建模表明，可能存在可能出现不可接受的危害的情况。因此，描述了用于快速测量附件中应力的方法，基于加速度计和第二摩擦应变计系统。现场测量结果表明，如何使用成熟的疲劳设计方法开发了简单的筛选标准，以评估结果并识别需要紧急行动的情况。

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