温度计套管的工程应用设计方法

 在工程应用中,温度计套管因共振导致断裂问题日益受到重视,相关的讨论也很多,但多局限于对共振频率的计算与评估,缺乏对共振情况下和非共振情况下温度计套管的受力分析和研究,没有一个综合的解决方案.针对这一现状,根据ASME PTC19.3 TW-2010提供的准则,通过对温度计套管振动频率、静态应力和动态应力的分析,建立了相应的极限限制条件,提出了温度计套管的应力分析和断裂评估的工程应用设计方法.从设计资料准备到计算评估等给出具体的设计步骤,并结合计算实例,介绍了这个方法的具体应用.这种方法可以使温度计套管从本质上避免共振折断.

A Design Method of Thermowells for Engineering Applications

In engineering applications, the fracture of the thermowells caused by resonance becomes more and more an important issue. But most studies were limited to the resonance frequency and very few were concerned with the stress analysis at points of resonance or away from resonance for the thermowells. So far there is no comprehensive solution. Based on the specifications of ASME PTC19.3 TW—2010, this paper establishes relevant limits by analyzing the vibration frequency, and the steady-state static and dynamic stresses in the thermowells. A design method of the thermowells for engineering applications is proposed, and the specific procedures of the calculation and the evaluation are shown through an actual example. It is shown that this method can ensure the safety of the themowalls in engineering applications.