PPR稳态管（PPR steady-state tube）

PPR稳态管（PPR steady-state tube） PPR稳态管(PPR steady-state tube) Technical characteristics and engineering application of PP-R aluminium plastic steady tube 1, 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 pipes, PP-R steady-state aluminum plastic pipe bearing performance is good, in the long-term strength, with metal characteristics, due to the metal layer, increasing pipe rigidity, reduced pipe creep, thus increasing the compressive strength of the pipe and heat resistance. 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 pipe 3.1 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) production, The German class ningel company, clean water company, HSM company and the world famous plastic pipe manufacturing company, has a history of nearly ten years in the production and application of products in Europe, European countries are the leading products in the field of water supply and heating. Ordinary PP-R aluminum tube outer wall thickness thickening, the hot melt connection, which belongs to the domestic original, but there is no corresponding international (ISO) or other advanced countries (such as DIN), Chinese (GB) and other relevant standards, not western developed countries use this product basis and corresponding application experience. In foreign countries, water supply, heating pipeline system commonly used in parallel form, ordinary PP-R aluminum composite pipe in application, water separator and water appliances (such as water, no radiator) connected with a joint pipe, both ends of the pipeline by pressing type mechanical joint, pipeline safety protection, joint to repair, but no hot melt connect the precedent. 3.2 PP-R aluminium plastic steady pipe has reasonable structure and high stability: From the mechanical point of view, the distribution of the radial stress of the pipe is from the inside to the outside, from the big to the small, and to the outer wall, the smaller the hoop stress, that is, the stress on the inner wall of the pipe is the largest, and the outer wall of the tube is the smallest (zero). PP-R plastic aluminum tube is in full compliance with the standard size requirements of the ISO/DIS15874-1999 tube series S, and plays a major pressure bearing role. The alloy aluminum layer is close to the outer wall of the tube and bears lower stress, and is a functional layer which not only reduces the coefficient of expansion of the PP-R tube, but also improves the creep resistance of the PP-R tube, the structure is reasonable and the stability is high. Ordinary PP-R plastic pipe is composed of multilayer material of cross-linked polyethylene and polypropylene material and aluminum three young's modulus difference of material pipe under internal pressure, tube thickness direction stress distribution is not equivalent, and different plastic tube, cannot use the standard size than the SDR value to characterize the capacity of materials load bearing; tube series S pipe material selection cannot be used to determine the wall thickness of the pipe. The common aluminum plastic pipe shall be suitable for compression type mechanical connection. If the use of hot melt connection, prone to "stratification" phenomenon, compressive strength, stability, foreign countries have no such precedent. 3.3 、 reliable connection and high safety: Hot water circulation of radiator heating, heat medium water is alkaline, corrosion of alloy aluminum foil is very strong. In engineering application, the aluminum layer of pipe is not allowed to touch the circulating hot water. PP-R steady-state aluminum plastic pipe by hot melt connection before connecting pipe strip covered with special tool aluminum plastic composite layer, the inner tube size standard tube series, hot melt method and PP-R, the aluminum layer completely exposed to heat water, securely, high safety, convenient operation, no leakage. Ordinary PP-R plastic pipe in the middle, in the hot melt connection, the pipe end with a sealing cap, the cap on inside the rubber ring sealed to prevent water ingress and corrosion of aluminum foil, this seal is not reliable, once the water contact is aluminum foil corrosion, the main structure layer will be destroyed, may burst pipe phenomenon. The safety of the pipeline system can not be guaranteed. Due to the thermal conductivity of aluminum layer of ordinary PP-R aluminum pipe, hot-melt welding, heat transfer along the axial direction, under different environmental conditions, the length, the melting time difference is very big, not easy to grasp. In the use of PP-R plastic aluminum pipe in the country, there has not been a case of leakage due to pipe joint quality accidents 3.4 PP-R plastic aluminum pipe is not shrunk, the pipeline system resistance is small: PP-R plastic aluminum pipe and pipe fittings adopt plug in hot melt connection, without any accessories, the connection is not shrink diameter, it can be calculated according to the normal procedures of hydraulic calculation, pipe network in the process of use is not easy to produce water blocking. The ordinary PP-R aluminum plastic pipe needs to be sealed with a sealing cap at the end of the tube before melting, and the water resistance is formed at each joint. The flow rate of the pipe network is reduced and the design requirement is not met. Using DN20 tube as an example, 27.8% to reduce the circulation area, the pipeline flow capacity is greatly reduced, the local resistance of pipeline system is normally more than 2 times, in the condition of the water pump and piping system under the same operating efficiency of heating system will be greatly reduced, Heating effect will not be guaranteed. If the caliber of the pipe is increased, the investment cost will be raised; if the running pressure is higher, the long-term operation cost will be greatly improved. 3.5 excellent UV resistance: The outer aluminum layer or the black PE layer of the PP-R aluminium steady tube can effectively block ultraviolet rays, and provide an ultraviolet protection barrier for the tube to ensure that the inner layer of the pressure bearing layer is not degraded by ultraviolet radiation. The outer layer (structural layer) of ordinary PP-R aluminum plastic pipe is easy to be degraded by ultraviolet ray, and has weak ultraviolet resistance, and the service life can not meet the design requirements. In the city of Wuhan tap water company to copy, a form of the renovation project in a large number of black PP-R steady-state aluminum plastic pipe, after nearly a year of operation, any expansion and contraction deformation, discoloration occurs no degradation. 3.6 environmental protection: In the process of production and utilization, the waste PP-R plastic aluminum steady pipe is rolled and processed, and the inner tube can be recycled and can not pollute the environment. The common PP-R aluminum plastic pipe is not easy to accomplish this point. Based on the comprehensive comparison of the above six aspects, the application of PP-R aluminium plastic steady tube in heating and water supply has incomparable advantages. It is the first choice of pipe in the engineering field. 4, PP-R plastic aluminum steady tube advantages, application areas: 4.1 hot water, central air conditioning, radiator heating; 4.2 indoor and outdoor pipe; 4.3 outdoor pipe network system, such as solar energy pipe network system. PP-R uses plastic aluminum steady-state tube widely, for solving the practical application problems, and can be used as a special pipe, chemical pipe, construction pipe, another important application is the transport of surface drinking water, water can be contaminated from some place to pass through the piping system, such as excessive fertilizer pollution places, aluminum layer can prevent the penetration of pollution sources, the protection of drinking water is not contaminated. At the same time, users can also enjoy the PP-R plastic aluminum pipe to bring other benefits, such as: (1) isolate any harmful substances that have an adverse effect on health; (2) direct contact with the water pipe health non-toxic, good sealing, not the formation of moss; (3) it has good sound insulation and makes the noise of water flow smaller. 5 、 engineering application example 5.1 Beijing CCTV 200 thousand m2 central air conditioning; 5.2 Beijing District Century City Project 600 thousand m2 radiator heating; 5.3 Chongqing Banan middle school 100 thousand m2 hot water transportation; 5.4 Wuhan city tap water company to copy transformation project (one hundred thousand). 6. Conclusion: PP-R plastic aluminum pipe is a kind of composite pipe with excellent performance. Through a large number of practical engineering applications, it has been unanimously recognized by users in various fields. With the continuous improvement and improvement of the pipeline technology, PP-R plastic aluminum steady tube will be more widely used in various fields