... , health and reliable, not only for hot and cold water pipe, also can be used for pure water ... pipe main USES what?1, building of hot and cold water systems, including centralized heat-supply system,2 the ... or discharge of chemical industry etc in piping systems.How to secure and economic chooses pp-r pipe?1, pay ... C = 150,2, for more than 40 degrees Celsius (cold) system, the selection P.N 1.0 ~ 160 ...