Matters needing attention in PPR pipe construction:
1. PPR pipe has lower hardness and poor rigidity than metal pipe. It should be protected during handling and construction to avoid mechanical damage caused by improper external force. After concealed laying, the position of the pipeline shall be marked to prevent the secondary decoration from damaging the pipeline.
2. PPR pipe has certain low-temperature brittleness below 5 degree . Be careful in winter construction. When cutting the pipe, use a sharp knife to cut it slowly. The installed pipeline shall not be pressed or knocked, and the parts vulnerable to external force shall be covered with protective objects if necessary.
3. PPR tube is easy to be aged and degraded by ultraviolet radiation for a long time. If it is installed outdoors or in direct sunlight, it must be wrapped with dark protective layer.
4. Except that PPR pipes are connected with metal pipes or water dispensers by mechanical connection methods such as threaded inserts or flanges, the rest shall be connected by hot melt to make the pipes integrated without leakage points.
5. The linear expansion coefficient of PPR pipe is relatively large (0.15mm / m degree ), and technical measures to prevent pipe expansion and deformation must be taken when exposed installation or non directly buried concealed pipe laying.
6. After the pipeline is installed, the pressure test must be carried out before sealing the pipe (directly buried) and covering the decorative layer (non directly buried concealed laying). The pressure test pressure of cold water pipe is 1.5 times of the working pressure of the system, but it shall not be less than 1MPa; The test pressure of hot water pipe shall be twice the working pressure, but shall not be less than 1.5MPa. The time and method of pressure test are specified in the technical specification.
7. When PPR pipes are laid in the open or not directly buried concealed way, supports and hangers must be installed as required.
