>>>PPR pipe selection and installation 1. PP-R pipe has lower hardness and poor rigidity than metal pipe. It should be protected during handling and construction to avoid mechanical damage due to improper external force. Mark the location of the pipe after the concealment in order to avoid secondary decoration and damage to the pipe. 2, PP-R pipe below 5 °C there is a certain low-temperature brittleness, construction in winter should be careful, when cutting pipe with a sharp tool to cut slowly. The installed pipeline can not be heavily pressed or struck, and if necessary, it can be used to cover protective parts of the external force. 3. The PP-R tube is susceptible to aging degradation due to long-term exposure to ultraviolet light, and must be coated with a dark protective layer when installed outdoors or in direct sunlight. 4, PP-R pipe in addition to metal pipe or water connection using threaded inserts or flanges and other mechanical connection methods, the rest should be used hot melt connection, so that the pipeline integration, no leakage point. 5. The coefficient of linear expansion of the PP-R pipe is relatively large (0.15mm/m°C). Technical measures must be taken to prevent the pipe from distending deformation during the installation of the surface-mounted or non-buried pipe. 6. After the pipeline is installed, it must be pressure tested before sealing (direct burying) and covering the decorative layer (non-directly buried dark deposit). The test pressure of the cold water pipe is 1.5 times the working pressure of the system, but not less than 10 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 specification. 7. When the PP-R pipe is applied with open or non-buried pipe, the support and hanger must be installed as required. Hydropower renovation construction acceptance decoration Power Coping Saw,Coping Saw For Metal,Coping Saw Blades For Metal,Round Coping Saw Blades ZHOUSHAN CHUNLEI HACKSAW CO.,LTD , https://www.bailei.com