1. Compared with metal pipes, PP-R pipes have lower hardness and lower rigidity. They should be protected during transportation and construction to avoid mechanical damage caused by inappropriate external forces. Mark the location of the pipeline after the dark application, so as not to damage the pipeline during the second decoration.
2. There is a certain low temperature brittleness of PP-R pipe below 5℃. Be careful in winter construction. When cutting the pipe, use a sharp knife to cut slowly. Do not place heavy pressure or knock on the installed pipeline, and if necessary, cover the parts that are vulnerable to external forces with protective materials.
3. The PP-R tube is prone to aging and degradation by long-term exposure to ultraviolet rays. It must be covered with a dark protective layer when installed outdoors or in direct sunlight.
4. Except for the mechanical connection methods such as threaded inserts or flanges used to connect PP-R pipes with metal pipes or water appliances, the rest should be connected by hot melt, so that the pipes are integrated and there is no leakage point.
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 not directly buried.
6. After the pipeline is installed, the pressure must be tested before sealing the pipe (direct burying) and covering the decorative layer (non-direct burying and concealing). The test pressure of the cold water pipe is 1.5 times the working pressure of the system, but not less than 1 MPa; the test pressure of the hot water pipe is 2 times the working pressure, but not less than 1.5 MPa. Pressure test time and method technical regulations stipulate.
7. When the PP-R tube is exposed or not directly buried, the support and hanger must be installed in accordance with the regulations.
8. Cool down to the specified time and complete the connection.
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