[China Aluminium Network] PP-R plastic aluminum steady state pipe has mature application experience: PP-R plastic aluminum steady state pipe refers to German Plastic Center (SKZ) standard, German Gas and Water Association (DVGW) technical regulations ( W542-1997, DVGW/MP52) production, the world-renowned plastic pipe manufacturing companies such as Benninger, Clean Water, HSM, etc., have produced and applied this product in Europe for nearly ten years. They are European countries. Leading products in the field of water supply and heating. Ordinary PP-R aluminum plastic pipe pipe thickens the outer wall thickness and uses hot melt connection. It is a domestic original, but there is no corresponding international (ISO) or other advanced countries (such as DIN), China (GB) and other related standards. Support, Western developed countries did not have the basis for the use of this product and the corresponding engineering application experience. In foreign countries, water supply and heating piping systems are usually in the form of “parallel connectionâ€. In the application of ordinary PP-R aluminum-plastic composite pipes, there is no joint on the pipe connecting the water separator and the water appliances (such as faucets and radiators). Compression-type mechanical joints are used to ensure the safety of the pipeline and the joints can be overhauled, but there is no precedent for hot-melt connections.
PP-R plastic aluminum steady-state pipe structure is reasonable, high stability: the water supply pipe from the mechanical point of view, the radial stress distribution of the pipe, from the inside to the outside, from large to small, the more the hoop stress to the outer wall, the smaller the pipe wall The stress is larger and the outer wall of the tube is smaller (zero). The PP-R plastic aluminum steady-state pipe inner tube fully complies with the standard size requirements of the tube series S in ISO/DIS15874-1999 and plays a major pressure-receiving role. The aluminum alloy layer is close to the outer wall of the tube, and it is a functional layer that 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 aluminum plastic tube is a multi-layer tube composed of cross-linked polyethylene material, polypropylene material and aluminum material with three different Young's moduli. When subjected to internal pressure, the ring stress in the thickness direction The distribution is not equal, and unlike plastic tubes, the ability of the tube to withstand the load cannot be characterized by the standard size ratio SDR value; the tube series S cannot be selected to determine the wall thickness of the tube. Ordinary aluminum plastic pipe should be suitable for compact mechanical connection. If hot-melt connection is adopted, “delamination†phenomenon will easily occur, the compressive strength will be reduced, and the stability will be poor. There is no such precedent in foreign developed countries.
The connection is reliable and the safety is high: the hot water circulation application of radiator heating, the heat medium water is alkaline, and the corrosiveness to the alloy aluminum foil is very strong. In the engineering application, the aluminum layer of the pipe is not allowed to contact the circulating hot water. The PP-R plastic aluminum steady-state pipe adopts hot melt connection. Before connection, the plastic aluminum composite layer covered by the pipe material is stripped with a special tool. The inner pipe size meets the requirements of the standard pipe series, and the hot-melting method is the same as PP-R. It does not touch the heat medium water completely, the joint is firm, the safety is high, the operation is convenient, and it is not easy to leak. Ordinary PP-R aluminum plastic pipe in the middle, before the hot melt connection, capping the end of the pipe, relying on the rubber ring inside the cap to prevent water penetration and corrosion of aluminum foil, this sealing method is not reliable, once The aluminum foil is exposed to water and corroded. The main structural layer will be damaged, and the tube burst may occur and the piping system may be installed.
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