带压修复硫铵工段煤气管泄漏问题

Repair of Gas Pipe Leakage at the Section of Ammonium Sulfate Under Pressure

新泰正大焦化厂硫铵工段出口φ1200mm碳钢煤气管道,因受出口煤气携带的酸性母液腐蚀,泄漏严重,大的漏洞有直径约200mm左右,如果更新这段管道,需要停产、停气、蒸气吹扫,直接投入及间接损失较大。如果采用带压封焊,由于泄漏的煤气量太大,管道的壁板已被腐蚀的很薄,该方案的安全性和可操作性太小。经过探讨,我们选定带压堵漏,然后用改性树脂玻璃钢加厚。目前已经正在使用。

Ф1200mm carbon steel gas pipeline at the export of the section of ammonium sulfate of Xintai Zhengda Coking Plant leaked seriously due to corrosion by the acid mother liquor carried by export gas, and the big loophole has a diameter of about 200mm; if this pipeline is updated, we need to stop production or gas, and purge with steam, and the direct investment and indirect losses are heavy. If the method of seal welding under pressure is used, as the volume of the leaked gas is too big, and the corroded wall plate of the pipeline is very thin, the program＇s safety and operability are too small. After our careful study, we have selected a program of leaking stoppage under pressure, and then thickened with modified resin FRP. Currently, the program has been in use.