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 when exposed to ultraviolet rays for a long time. It must be covered with a dark protective layer when installed outdoors or in direct sunlight.
4. The PP-R pipe should be connected by hot melt, except that it is connected with metal pipes or water heaters using threaded inserts or flanges, and the rest should be connected by hot melt, so that the pipeline is 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 according to the regulations.
8. Cool down to the specified time and complete the connection.

ZHEJIANG QIAI TUBING INDUSTRY CO.,LTD was established in 1996, is professional China PPR Pipes Manufacturers and PPR Fittings factory. QIAI Based on excellent management,relying on the perfect quality system .All the productions passed by ISO9001 international quality management systerm,Certificated by CE.Our main products include: PP-R pipes and fittings,Aluminum pipes and fittings, PE-RT pipes and fittings,Brass Fittings,Water and Gas Valves, Stainless Steel Corrugated Flexible Gas hose, wholesale PPR Pipes, and so on.At present, the company's product sales network has spread all over the world, establish and improve the quality, efficient and fast professional marketing management team and service support system for the vast number of users, welcome!