1. Waste draining pipe, offlet or drain pipe should be connected to the main pipe; each pipe should connect two valves with the most possible short valve-to-valve pipe length. 排污管、放水管或疏水管应分别连接到各自的总管上，每管均应串接两个阀门，两阀门间的管段应尽量缩短。
2. Pipe production line: Double wall Metal Reinforced Spiral Corrugated Pipe production line Double wall corrugated pipe, Steel plastic composite pipe and PE pipe and HDPE spiral pipe production line. 管道类——钢骨架增强缠绕波纹管、大口径双壁波纹管、钢塑复合管以及实壁或结构壁聚乙烯管成套生产设备。
3. Discuss varies waste treatment technics plan with customer together for living waste, medical waste, industrial waste, dejecta waste and sludge etc. 与客户共同探讨各地区生活垃圾、医疗垃圾、工业垃圾、粪便、污泥等垃圾处理工艺方案；
4. HDPE pipe used for lining is penetrated into a concrete pipe then it forms pipe-in-pipe structure so as to raise pressure bearing capacity of the concrete pipe. HDPE管具有强度高、耐腐蚀、使用寿命长、管壁光滑、不结垢等优点，内衬HDPE管可与混凝土管形成整体性良好的管中管结构，使混凝土管承压能力大大提高。
5. the factory, the workshop discharge waste smoke, waste gas, waste water, waste residue and noise; 1〕工厂、作坊排出的废烟、废气、废水、废渣和噪音；
