某石化公司重整车间加氢反应器在外壁宏观检查过程中发现垂直壁厚方向由外向内的横孔超标缺陷。缺陷位于塔上段筒体与下封头环焊缝热影响区,缺陷尺寸(内径×深度)为φ4mm×18mm,从该孔的外观判断,其为制造或检修遗留下的机械加工孔,缺陷位置示意图见图1。该反应器由意大利进口,中石化某分公司安装,1999年4月金相试验分析发现母材组织接近完全球化。由于缺陷处于该反应器熔合线上难于返修,采用三维有限元数值模拟分析计算方法,计算该反应器超标缺陷部位附近的结构塑性极限载荷值,并按照JB4732—95《分析设计标准》,若操作工况下和水压试验两种工况下的内压载荷值不超过计算出的对应的结 A petrochemical company reformer workshop hydrogenation reactor in the outer wall macro-examination found that the vertical wall thickness direction from the outside to the horizontal hole exceeding the standard defects. The defect is located in the heat affected zone of the girth weld of the upper cylinder and the lower head of the tower. The defect size (inner diameter × depth) is φ4 mm × 18 mm. Judging from the appearance of the hole, the defect is a machined hole left in manufacture or maintenance, Schematic diagram shown in Figure 1. The reactor imported from Italy, a branch of Sinopec installed in April 1999 metallographic test analysis found that nearly complete the matrix organization. Due to the defects in the reactor fusion line is difficult to repair, the use of three-dimensional finite element numerical simulation analysis and calculation of the reactor excessive defects in the plastic structure near the limit load value, and in accordance with JB4732-95 “design analysis of the standard”, if the operation Working conditions and hydraulic test under two conditions of internal pressure load value does not exceed the calculated corresponding to the junction