There are many materials for water supply pipes and drainage pipes on the market, so how should you choose? What should we pay attention to? Let me give you a detailed explanation below: 1: Outdoor water supply pipes (1) Reinforced concrete pipes. This type of pipe is corrosion-resistant and relatively aggressive, but construction and installation are inconvenient. (2) Gray cast iron pipe. This type of pipe has good corrosion resistance, but is relatively brittle and has low pressure-bearing capacity. (3)Steel pipe. There are two types of spiral seam steel pipes and seamless steel pipes. This type of pipe has a high pressure bearing capacity, good mechanical properties, and is easy to connect and construct, but has poor corrosion resistance. (4) Ductile iron water supply pipe. The strength and stiffness of the pipe are very good. The corrosion resistance of the pipe is good. The construction and installation of the pipe are not difficult, but the price is higher. (5) Rigid polyvinyl chloride (PVC-U) water supply pipe. The pipe is light, easy to construct, saves energy, and has good corrosion resistance. The mechanical properties of the pipe are worse than those of steel pipes and ductile iron pipes. The pipe’s shear resistance and resistance to Push and pull performance is poor. (6) Polyethylene (PE) pipe, a new type of environmentally friendly building material, has good push-pull resistance, shear resistance, and corrosion resistance. But this tube is not resistant to high pressure. The maximum working pressure of PE100 water supply pipe is 1.6MPa. This is a pipe material that is currently strongly advocated and promoted by the country. This kind of pipe has fatal shortcomings: poor flame retardancy (fire protection must be strictly observed during storage) and easy aging (this pipe is strictly prohibited from being laid in the open). 2: Water supply pipes in the building 1. Drinking water pipes. Domestic drinking water pipes include: rigid polyvinyl chloride (PVC-U) water supply pipe, water supply polyethylene PE pipe, random polypropylene PP-R pipe, cross-linked polyethylene (PE-X) pipe, water supply thin Wall copper pipes, thin-walled stainless steel pipes for water supply, steel-plastic (plastic-lined, plastic-coated) composite pipes, etc. Each of these pipes has its own advantages and disadvantages, but the best overall performance is: PE water supply pipe (but this pipe must be installed because the Pipe laying is easy to age), PP-R water supply pipes and thin-walled copper pipes. 2. Domestic hot water pipes can use heat-resistant polyethylene pipes, heat-resistant PP-R pipes, thin-walled copper pipes and thin-walled stainless steel pipes. 3. For production and fire-fighting water supply pipelines, if the pressure is not high (P≤1.0MPa), galvanized steel pipes can be used. If the pressure is high (P>1.0MPa), galvanized steel pipes can be used. Three: Outdoor drainage pipes (1) Concrete pipes. This is a pipe that has been used for dozens of times. Practice has proved that in cities and towns, this kind of pipe has many shortcomings: 1) The sealing performance of the pipe is not good, and the interface is easy to seep, causing sewage to leak out and cause pollution. 2) The shear resistance of pipes is poor, especially in cities where there are many people and cars, and drainage pipes are located on both sides of the road. The pipes will break within a few years, especially on both sides of urban main roads where the burial depth is less than 1.0m. , this phenomenon is very common. (2) Rigid polyvinyl chloride (PVC-U) double-wall corrugated pipe. This pipe was only used in the 1990s. The pipe has good anti-corrosion properties and joint sealing properties. It is easy to construct and has a low cost. However, this kind of pipe has poor mechanical properties and average pressure resistance. It is used for drainage. Pipes can only be used in branch pipelines and places with few vehicles. (3) Rigid polyvinyl chloride (PVC-U) pipe for buried sewage is a pipe specially used for buried sewage. The comprehensive performance is second only to polyethylene double-wall corrugated pipe. (4) Polyethylene HDPE double-wall corrugated pipe. This is a new type of pipe that has been put into use in recent years. It has many advantages such as good sealing performance, good pressure resistance, and good corrosion resistance. It is also the pipe material currently being promoted and used. Four: Drainage pipes in buildings. Drainage pipes in buildings have been proven through decades of practice: hard polyvinyl chloride PVC-U drainage pipes and flexible interface drainage cast iron pipes are more popular drainage pipes. The above has introduced the various types of water supply and drainage pipes currently used in our country. When using them, you must make a comprehensive comparison and analysis based on the local conditions, the nature of the project, and the technical strength and economic status of the construction personnel to make a more reasonable decision. decision.