1. PVC-U pipe
Polyvinyl chloride hard pipe is PVC-U pipe, which can be divided into double-layer corrugated pipe, reinforced pipe, flat wall pipe and steel-plastic composite winding pipe according to the pipe wall structure. When the PVC-U pipe is used as a drainage pipe, the concentration of hydrogen sulfide gas in the drainage pipe is higher than that in the concrete drainage pipe, and the PVC pipe has good odor sealing performance.
When PVC-U is used as a drainage pipe, its production energy consumption only accounts for 20% of that of cast iron drainage pipes with the same diameter. It has low cost, aging resistance, good heat preservation effect and long service life, so it is widely used in municipal drainage. PVC-U pipe is relatively brittle and not resistant to external pressure, so when the pressure requirement is high, a reinforced pipe or a steel-plastic composite winding pipe is used, which has good compressive performance. Based on the various advantages of PVC-U pipes, it is widely used in municipal drainage and rainwater pipes, and is convenient for construction and installation.
2. PE pipe
PE pipe is a polyethylene pipe, mainly including double-wall corrugated pipe, wound structure wall pipe, steel-plastic composite wound pipe and steel belt reinforced spiral corrugated pipe.
Double-wall bellows are usually connected by socket or double socket and sealed with rubber ring. In addition to the connection method of double-wall bellows, the wall pipe of the winding structure can often be connected by welding, or by clamps, Huff, flanges, etc.
Polyethylene pipes are divided into three types: low density, medium density and high density. High-density polyethylene pipes are widely used in the field of municipal water supply and drainage. Its impact resistance, heat resistance, abrasion resistance and acid and alkali corrosion resistance, lowest permeability. The quick-cracking resistance is obviously better than PVC-U, and the thermal insulation performance is good, so it is widely used in municipal water supply, drainage and rainwater treatment. Especially used in municipal water supply systems, it has the advantages of high pressure resistance, small head loss, and less water leakage.
