The most commonly used water supply plastic pipes are water supply rigid polyvinyl chloride pipes (UPVC) and water supply polypropylene pipes (PP pipes). In addition, there are polyethylene (PE) pipes, which are suitable for conveying water with a temperature not exceeding 40 °C. The relevant standards follow the provisions of "Polyethylene (PE) Pipes for Water Supply" GB/T13663; cross-linked polyethylene (PE-x) Pipe: Polybutene (PB) pipe, suitable for conveying water with a water temperature of -20"--90°C. They all have strong chemical stability, corrosion resistance, and are not affected by acids, alkalis, salts, oils and other media. Corrosion, smooth pipe wall, good hydraulic performance, light weight, easy to process and install. Water hard polyvinyl chloride pipe (UPVc), the temperature of water transport does not exceed 45 ℃. UPVC pipe generally adopts socket connection, in which socket and socket bonding Suitable for pipes with an outer diameter of 20～1601m; rubber ring connection is suitable for pipes with an outer diameter greater than or equal to 63mm; the connection with metal pipe fittings, valves, etc. is threaded or flanged. Water supply polypropylene pipe (PP pipe), suitable for system The working pressure is not more than 0.6Mpa, and the working temperature is not more than 70℃. The water supply polypropylene pipe adopts hot-melt socket connection. When connecting with metal pipe fittings, use polypropylene pipe fittings with metal inserts as a transition. The pipe adopts hot-melt socket connection, and adopts threaded connection with metal pipe fittings.
