ppr稳态管（ppr稳态管）Technical characteristics and engineering application of PP-R aluminium plastic steady tube1, product overview: composite pipe, generally refers to the pipe by two or more than two layers of thermoplastic and a layer of embedded metal layer of multilayer pipe. PP-R aluminium plastic steady tube is a composite pipe made of PP-R tube and alloy aluminum layer. Germany is called PP-R steady compound tube, PP-R enhancement tube or PP-R clad aluminium tube. PP-R steady-state aluminum plastic pipe PP-R plastic and metal organic combination of both flexibility and rigid metal tube plastic tube, to achieve stable mechanical properties through the integration of the aluminum layer has higher strength and better high-temperature performance.PP-R steady-state aluminum plastic pipe composite pipe is a new hot and cold water, there is no corresponding international standards and national standards, including Germany clean water companies, all PP-R steady-state aluminum plastic pipe manufacturers in the implementation of the enterprise standard itself (with the German SKZ detection mechanism for heating and water supply pipe Ordinance).2, technical performance characteristics:PP-R steady-state aluminum plastic pipe into the PP-R tube and the metal tube in one of the advantages, at the same time with PP-R tube health and sealing and metal pipe rigidity, forming a unique superior general plastic pipe has special properties, linear expansion coefficient, impervious to physical properties of oxygen, anti UV, high strength, high temperature resistance so excellent.2.1 linear expansion coefficient is small:PP-R plastic aluminum steady-state pipeline expansion coefficient is ordinary PP - R tube 1/5 (ordinary PP-R pipe is 0.15 mm/m K), close to the metal pipe, the pipe has no obvious expansion and contraction. After the installation, pipe installation for the next level of less than 40 meters in length, without considering the deformation of the pipeline; for horizontal installation length is greater than the Ming pipe 40 meters, should take technical measures to prevent the pipeline temperature deformation for the rigid riser installation. It has obvious advantages in the field of high temperature hot water, heating and ventilating and outdoor installation.Practice has proved that the PP-R plastic aluminum steady tube has no deformation or abnormal phenomenon after the long-term hot and cold cycle experiment. It fully shows that the PP-R aluminum plastic steady tube has stable high temperature resistance.2.2 oxygen free and hygienic:Because the PP-R steady-state aluminum plastic pipe in PP-R inner tube outer surface covered with a plastic alloy foil, to wear on a layer of metal armor, completely isolated from the outside air, to keep the fluid medium inside the pipe system by oxygen penetration and light penetration, thereby inhibiting the growth of bacteria algae, to ensure water quality. When the PP-R plastic aluminum tube is used in the central air conditioning system and heating system, it can prevent the oxidation and corrosion of the metal equipment.2.3 anti uv:PP-R plastic aluminum pipe is outside the aluminum layer and is covered with a gray PP-R or black PE protective layer. The aluminum layer can effectively block ultraviolet light, and the gray PP-R can protect the aluminum layer from oxidation, and the black PE absorbs and shields the ultraviolet ray effectively, providing an ultraviolet protection barrier for the tube. The pipe can be used for outdoor installation and installation of pipes, and has long service life without considering UV protection measures. It is an ideal choice for outdoor construction of solar energy and thermal energy systems.2.4, high compressive strength, good temperature resistance:Compared with other tubes, PP-R plastic aluminum steady pipe has good pressure bearing performance, and has certain metal property in long-term strength. Because of adding metal layer, the rigidity of pipe is increased,The creep property of the pipe is reduced, and the compressive strength and temperature resistance of the pipe are enhanced. In engineering applications, tubing can be selected according to the design factor C=1.25.2.5 hot melt connection, no leakage:PP-R is still using the steady-state aluminum plastic pipe hot melt connection method, before connecting with special sharpening tool strip coated with plastic composite layer, PP-R pipe with the same material and then melt connection, ensure the integration of pipes and fittings, connecting parts without leakage of sorrow.Comparison of 3 and PP-R plastic aluminium steady tube with common PP-R aluminum plastic pipe3.1 PP-R plastic aluminum pipe, with mature application experience:PP-R steady-state aluminum plastic pipe by the German plastics Center (SKZ), German standard gas and Water Association (DVGW) technical manuals (W542-1997, DVGW/MP52), the German clas