The reasons for the leakage of high-pressured ammonia pre-heater row tubes and seals were explained, and how to handle and prevent the occurrence of similar accidents was proposed.

分析尿素装置高压氨预热器多次发生列管及封头泄漏的原因，提出如何处理及防止类似事故的发生。

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The reasons for the leakage of high-pressured ammonia pre-heater row tubes and seals were explained, and how to handle and prevent the occurrence of similar accidents was proposed.

综述合成氨二段转化废热锅炉失效历程分析 ，废热锅炉列管穿孔、管板泄漏及水压试验泄漏的原因 ，提出解决对策。

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For carbon steel, stainless steel, plating steel and all kinds of non-ferrous metal rods, tubes, the sheet metal, screw the spot welding and welding until the row.

可进行碳钢、不锈钢、电镀钢及各种有色金属的线材、管材、板料，螺钉等到的点焊和排焊。

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Below that is a row of four test tubes, marked with a circle, an X, a square and a plus sign.

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