环形集箱壁厚计算的研究分析

Research and Analysis of Wall Thickness Calculation of Annular Header

石化行业炉型正向大型化、高参数转变,炉内受压管路中弯管属于应力集中部位,爆管多发生在该区域。以环形集箱为例,采用不同标准进行壁厚计算,发现内弧最小需要壁厚均大于外弧最小需要壁厚,即理论计算中内弧侧受到的应力工况更苛刻,而在项目现场弯管出现泄露多出现在外弧侧,故对等厚度理想和不等壁厚两种截面工况进行应力分析,发现最大应力区域由内弧转移到外弧,故弯管计算时应综合考虑内弧、外弧最小需要厚度及制造减薄量。

In petrochemical industry,furnace types are shifting towards large-scale,high parameter.The bends in the pressurized pipelines inside the furnace belong to stress concentration areas,and tube explosions often occur in this area.Taking the annular header as an example,different standards were used to calculate the wall thickness.The results showed that the minimum required wall thickness of the inner arc was greater than the minimum required wall thickness of the outer arc,indicating that the stress conditions on the inner arc side were more severe in theoretical calculations.According to actual project site experience,the leaks mostly occurred on the outer arc side of the bent pipe.Therefore,stress analysis was conducted on the ideal and unequal wall thickness sections,and it was found that the maximum stress area was transferred from the inner arc to the outer arc.Therefore,in the calculation of bent pipes,the minimum required thickness of the inner and outer arcs and the manufacturing thinning amount should be comprehensively considered.