Bimetallic composite pipes for petrochemical industry, corrosion-resistant bimetallic composite pipes

Application fields of bimetal composite pipe
Water supply introduction pipe
Outdoor water supply pipe
Pipe for water pump room
High-rise building water supply pipe, water distribution main pipe air conditioning circulation pipe, fire sprinkler pipe< br/> Hot water pipes, direct drinking water pipes
Water supply pipes for finely decorated high-end commercial buildings, etc.
2. Comparison between bimetal composite pipes and steel-plastic pipes
Steel-plastic pipes use galvanized pipes as the outer pipe , the inner tube is made of plastic tube.
The difference in physical properties of the inner and outer tubes leads to defects in this product.
) The thermal expansion coefficient of plastic is three times that of galvanized pipe. Under the condition of temperature difference, the inner pipe will be longer or shorter than the outer pipe (a meter-long pipe will block the pipe connection). After many times of thermal expansion Due to cold shrinkage, the inner and outer tubes will be completely peeled off
) The water flows in a spiral in the pipeline. The pressure generated by the water flow and the pressure generated by the pipeline drop will cause the peeled plastic tube to spirally twist and block the pipeline.
3. Comparison of thin-walled stainless steel pipes, copper pipes and bimetal composite pipes
) In terms of physical properties, because the wall is thin, its strength, rigidity, tensile strength, compression resistance and resonance resistance are Poor performance
) In terms of connection method, the compression type or welding technology is used. The compression type is sealed with silicone, which is easy to age and cannot withstand external impact because of its thin wall. It is easy to be damaged. After damage, it cannot be repaired and can only be replaced. , maintenance is troublesome and costly. In addition, the use of welding technology can easily lead to pitting corrosion and stress corrosion, and the welding process is not easy to operate
) In terms of economic performance, the prices of thin stainless steel pipes and copper pipes are relatively high. Comparing the prices of main materials and pipe fittings, stainless steel-lined composite steel pipes have a price advantage compared with thin stainless steel pipes and copper pipes.
) The thermal conductivity is high, that is, the thermal insulation performance is poor, so it is difficult to transmit warm and hot water.
In addition, copper pipes also have the following problems. There are some misunderstandings in the selection of copper pipes in the market. The copper pipes themselves are of high quality. The products have different functions depending on the environment in which they are used. When transporting pure water, copper pipes are the best choice. They can play a sterilizing role, are hygienic and reliable, and play an important role in the environment where ordinary tap water is transported. On the contrary, it is not only harmful to the human body, but also harmful to the human body. Because the chloride ion content in tap water is higher than or equal to the same, copper is less corrosive than chlorine ion, causing copper to react with chloride ions to form copper chloride, thus affecting the water quality. In addition, the external anti-corrosion performance of copper pipes is also very poor. It is easy to oxidize and produce patina, destroying the appearance and polluting the environment. Therefore, the service life of copper pipes is not very long.