常用开孔补强方法在封堵三通中的应用

Common opening reinforcement methods for plugging tee

封堵三通是圆柱壳径向接管的一种特殊形式,由于其开孔率大且开孔边缘部位应力成分复杂,设计方案及强度计算方法没有形成统一的规范。介绍了几种常用的压力容器开孔补强计算方法,以1 422 mm封堵三通为例,选用压力面积法、压力-面积应力法、有限元应力分析法进行补强计算。对比各计算结果发现:压力面积法安全裕量不足;压力-面积应力法采用ASME BPVCⅧ-1-2010标准时,在封堵三通的补强计算上存在一定问题,采用ASME BPVCⅧ-2-2010标准时,与有限元分析法得到的结果最为接近,并且此标准不限制开孔率,计算简单方便,因此在封堵三通的设计计算中应该优先选用。

Plugging tee is a special form of radial nozzle for cylindrical shell. However, there is no unified standards for its design scheme and strength calculation method, due to its large opening rate and complex stress components at the opening edge. In this paper, some common methods of opening reinforcement calculation for pressure vessel were presented. Taking the 1 422 mm plugging tee as an example, pressure area method, pressure-area stress method and finite element stress analysis method were adopted for reinforcement calculation. Comparison of the calculation results shows that the pressure area method is insufficient in the aspect of safety allowance, and the pressure-area stress method has some problems if ASME BPVC Ⅷ-1-2010 is adopted, but provides the most similar results to the finite element stress analysis method if ASME BPVC V]1-2-2010, which has no limit for opening rate, is adopted. In addition, the calculation in ASME BPVC Ⅷ- 1-2010 is simple and convenient, so it should be preferred in the design and calculation of plugging tee. （5 Figures, 5 Tables, 12 References）