一、问题提出我厂润滑油加氢精制装置于1995年底开工,临氢系统管线、法兰及管件全部使用不锈钢材料,正常运转整4年,但在2000年初开工时,发现以下问题:(1)在开工前气密及升压时,发现临氢系统反应器出入口法兰的母体与焊缝处均有裂纹产生,在反应产物——原料油混合氢换热器的管线上也出现了裂纹,裂纹的最大长度为110mm,所有裂纹 First, the problem put forward I plant lubricants hydrotreating plant started in late 1995, the Pro hydrogen system piping, flanges and fittings all use stainless steel, normal operation for 4 years, but started in early 2000, found the following problems: (1 ) Before the start of the gas-tight and step-up, it was found that the inlet and outlet flange of the hydrogen system reactor had cracks at both the weld and the parent material, and there was also a crack in the pipe of the reaction product-feedstock mixed hydrogen heat exchanger , The maximum crack length is 110mm, all cracks