Issues That Should Be Paid Attention To During The Installation And Construction Of PP-R Pipes

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. After concealing, mark the location of the pipeline to prevent secondary decoration from damaging the pipeline.
2. PP-R pipe has a certain low-temperature brittleness below 5℃. Be careful during winter construction and use a sharp knife to cut slowly when cutting the pipe. Do not put heavy pressure or knock on the installed pipelines. If necessary, cover the parts susceptible to external force 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 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 large (0.15mm/m℃). When laying pipes for surface installation or non-direct burial and concealed laying, technical measures must be taken to prevent pipe expansion and deformation.
6. After the pipeline is installed, the pressure must be tested before the pipe is sealed (directly buried) and covered with a decorative layer (non-directly buried and concealed).
The pressure test pressure of the cold water pipe is 1.5 times the system working pressure, but not less than 0.6MPa;
The test pressure of hot water pipes is twice the working pressure, but shall not be less than 1.5MPa.
Pressure test time and method technical regulations
7. When PP-R pipes are laid open or not buried directly, supports and hangers must be installed according to regulations.