Abstract:1. Compared with metal pipes, PP-R pipes have lower hardness and poorer rigidity. They should be protected during handling and construction to avoid m...
1. Compared with metal pipes, PP-R pipes have lower hardness and poorer rigidity. They should be protected during handling 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 pipe below 5℃. Be careful in winter construction. Use a sharp knife to cut the pipe slowly. Do not press or knock the installed pipe. If necessary, cover and protect the parts that are vulnerable to external forces. Things.
3. The PP-R tube is prone to aging and degradation by long-term exposure to ultraviolet rays. It must be installed with a dark protective layer when installed outdoors or in direct sunlight.
4. In addition to the mechanical connection methods such as threaded inserts or flanges used for connection with metal pipes or water heaters, the PP-R pipes should be connected by hot melt to integrate the pipes and have no leakage points.
5. The linear expansion coefficient of the PP-R pipe is relatively large (0.15mm/m℃), and technical measures must be taken to prevent the expansion and deformation of the pipe when the pipe is exposed or buried in the dark.
6. After the pipeline is installed, the pressure must be tested before sealing the pipe (direct buried) and covering the decorative layer (non-direct buried hidden application). The pressure test of the cold water pipe is 1.5 times the working pressure of the system, but not less than 1.0MPa; hot water pipe The test pressure is twice the working pressure, but not less than 1.5MPa. The pressure test time and method technical regulations stipulate.
7.When the PP-R tube is open or not directly buried, the support and hanger must be installed in accordance with the regulations.
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