1. PP-R pipes have lower hardness and poorer rigidity than metal pipes. They should be protected during transportation and construction to avoid mechanical damage caused by inappropriate external forces. The location of the pipes should be marked after concealing to avoid damage to the pipes during secondary decoration.
2. There is a certain low-temperature brittleness of PP-R pipes below 5°C. Care should be taken during winter construction. When cutting pipes, use a sharp knife to cut slowly. Do not press or knock the installed pipes. If necessary, cover the parts that are susceptible to external forces with protective materials.
3. PP-R pipes are prone to aging and degradation when exposed to ultraviolet rays for a long time. They must be wrapped with a dark protective layer when installed outdoors or in direct sunlight.
4. Except for mechanical connection methods such as threaded inserts or flanges when connecting PP-R pipes to metal pipes or water heaters, the rest should be hot-melt connections to integrate the pipes without leakage points.
5. The linear expansion coefficient of PP-R pipe is relatively large (0.15mm/m°C). Technical measures must be taken to prevent pipe expansion and deformation when laying pipes for surface installation or non-direct burial.
6. After the pipeline is installed, it must be pressure tested before sealing the pipe (direct burial) and covering the decorative layer (not directly buried and concealed). The pressure test pressure of the cold water pipe is 1.5 times the working pressure of the system, but not less than 1.0MPa; the test pressure of the hot water pipe is 2 times the working pressure, but not less than 1.5MPa. The pressure test time and method are specified in the technical regulations.
7. When PP-R pipes are laid in the open or not directly buried or concealed, supports and hangers must be installed according to regulations.
