... pipe, also can be used for pure water system.2, heat insulating and energy-saving. Pp-r ... can meet the standard of building drainage water system requirements.4 and long service life. Pp- ... cold water systems, including centralized heat-supply system,2 the heating system, building, including floor, wall panels and ... can choose C = 150,2, for more than 40 degrees Celsius (cold) system, the selection P.N 1 ...