本文对水溶液全循环法尿素合成塔物料管检验缺陷进行了统计分析,指出物料管缺陷主要是液氨物料管管口裂纹,其是由物料管焊接结构、温差应力、腐蚀介质和工况条件等因素综合影响造成的。并指出可以通过控制工艺稳定性,预混甲铵和液氨以及改善焊接接头应力集中程度等方法来降低液氨进口管管口裂纹出现的频率。 In this paper, statistical analysis was made on the inspection defects of the material pipe of the urea synthesis tower in the full-cycle aqueous solution process. It was pointed out that the material pipe defects mainly consisted of liquid ammonia material pipe mouth crack, which was caused by material pipe welding structure, temperature difference stress, corrosive medium and working conditions The combined effect of factors. It is pointed out that it is possible to reduce the frequency of the liquid ammonia inlet pipe crack by controlling the process stability, premixing ammonium and liquid ammonia and improving the stress concentration of welded joints.