For the large diameter HDPE pipe, it is often used in water supply or sewage pipe field due to its very thick wall. For the 630-800mm diameter pipe line, we adopt 120/38 350KW extruder to ensure its output capacity. Our motor is Siemens-beide(joint venture in China). It has very good quality and long lifeworking time. Meanwhile due to it is famous brand in the whole world, it has good after-sales service. Our vacuum tank is 9 meteres long with totally SUS304/3mm. This steel thickness ensures the tank strong and good vacuum effect. For the large diameter with thick wall HDPE pipe, this line also equips with two 9 meters long spraying cooling tank. We used good quality sprazzles ensuring the spraying water even and continuous. For the cuttting system, it equips two kinds of cutting including knife cutting and planetary cutting. The cuttting system has automatic adjustment system. It could be adjusted according to different producing pipe size. Our machine is totally automatical that can start production by one buttom. It makes that production without workers come true.