What problems should be paid attention to during the installation and construction of PP-R pipe:
1. PP-R pipe is lower in hardness and rigidity than metal pipe, and should be protected during handling and construction to avoid mechanical damage caused by improper external force. After the dark application, the position of the pipeline should be marked to avoid damage to the pipeline due to the secondary decoration.
2. PP-R tube has a certain low temperature brittleness below 5 Â°C. Be careful when constructing in winter. Cut the tube slowly with a sharp cutter. The installed pipelines should not be stressed or tapped, and if necessary, cover the parts that are vulnerable to external forces.
3, PP-R tube is prone to aging degradation by ultraviolet radiation for a long time, and it must be wrapped in a dark protective layer when installed outdoors or in direct sunlight.
4. In addition to the mechanical connection of threaded inserts or flanges, the PP-R pipe should be connected with metal pipe or water machine, and the other should be hot-melt joint to make the pipe integrated without leakage.
5. The coefficient of linear expansion of PP-R pipe is large (0.15mm/m Â°C). Technical measures to prevent pipe expansion and deformation must be taken when installing or not directly burying the dark pipe.
6. After the pipeline is installed, it must be tested before sealing (direct burial) and covering the decorative layer (not directly buried and dark). The pressure test pressure of the cold water pipe is 1.5 times of the working pressure of the system, but not less than 10 MPa; the test pressure of the hot water pipe is twice the working pressure, but not less than 1.5 MPa. Pressure test time and method technical regulations.
7. When PP-R pipe is used or not directly buried in the dark pipe, the branch and hanger must be installed as required.
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