The blowhole of cooling water ringed pipe often block up in a vertical drum.Its causes include impurity in water,no release valve at ringed pipe,burr inner pipe and easier rust of blowhole etc.

• 立式罐冷却喷水环管的喷水孔经常堵塞,堵塞的主要原因是水中含有杂质、喷水环管上没有装放空阀、喷水环管内壁有毛刺和喷水孔易锈蚀等;