The corrosion to the urea converter lining in ammonia stripping process is chiefly found on both No.1 and No.2 barrel sections;based on the life analysis of thinning lining, the skin on upper head of urea converter, lining of both No.1 and No.2 barrel sec%氨汽提工艺尿素合成塔衬里腐蚀主要发生在第1、2筒节衬里，对减薄衬里进行寿命分析，尿素合成塔上封头瓜皮、第1筒节衬里、第2筒节衬里在衬里下一轮大修时必须更换。根据尿素合成塔的结构特点，提出切割上封头整体更换衬里的思路和方法。
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