Water supply pipe material and performance of specific comparative analysis

[China Aluminum Network] Types of Water Supply Pipes In the past, the pipes used for water supply were mainly cast iron pipes. Sand cast iron pipes are mainly used outdoors, and galvanized cast iron pipes are used indoors. They can be divided into cold (electric) galvanized and hot galvanized. China has stipulated the elimination of sand mold castings and cold galvanized cast iron pipes on June 1, 2000, and gradually restricted the use of hot-dip cast iron pipes, and promoted the use of aluminum-plastic composite pipes and plastic pipes.
Therefore, there are three major categories of pipelines currently in use. The first category is metal pipes, such as hot-dip cast iron pipes, steel pipes, stainless steel pipes, etc. The second category is plastic complex metal pipes, such as plastic compound steel pipes and aluminum plastic composite pipes. The third category is plastic pipes, such as PP-R (cross-linked polypropylene high density mesh engineering plastics). The State also stipulates that various pipes and fittings involving drinking water pipelines must be approved by the Ministry of Health for sale.
Plastic code and meaning commonly used in water supply pipes:
PP-R Crosslinked Polypropylene High Density Mesh Engineering Plastics PE High Density Polyethylene PP Polypropylene PB Polybutylene PEX Crosslinked Polyethylene Water Supply Pipes Comprehensive Performance Requirements: As a water supply pipe, it requires hygiene, safety, energy saving, and convenience. Therefore, the inspection of a pipeline should be checked from four aspects. That is health: Pipes and fittings must have no harm to the human body.
Safety: Has sufficient strength and excellent mechanical properties as well as anti-aging, heat resistance and other properties.
Energy-saving: smooth inner wall, corrosion resistance, low resistance to fluids, good insulation performance. Convenient: The connection, construction is convenient, reliable, and has the possibility of promotion and use. Failure to meet the above four requirements will impair the health and property safety of users.
Several types of water supply pipe:
1, aluminum-plastic composite pipe aluminum-plastic composite pipe is an earlier replacement of cast iron pipe water supply pipe, the basic composition should be five, that is, from the inside out followed by plastic, hot melt adhesive, aluminum alloy, hot melt adhesive, plastic. The aluminum-plastic composite pipe has better thermal insulation performance, and the inner and outer walls are not easy to be corroded. Because the inner wall is smooth, the resistance to the fluid is very small, and because it can be bent freely, the installation is convenient. As a water supply pipe, aluminum-plastic composite pipe has sufficient strength, but if the lateral force is too large, it will affect the strength, so it should be used as a clear pipe or buried in the wall, but it should not be buried underground. The connection of the aluminum-plastic composite pipe is card sleeve type, so the first one is to pass a strict pressure test to check if the connection is firm. The second is to prevent frequent vibration and loosen the ferrule. Third, the length of the installation should be enough to avoid pulling.
2. The plastic-reinforced copper pipe and plastic-reconstituted copper pipe is made of pure copper (copper) as the pipe fitting and covered with PE plastic. From the perspective of comprehensive performance, the plastic-reconstituted copper pipe is slightly better than the aluminum-plastic composite pipe. For example, better strength, longer life, better heat resistance. However, the insulation performance is slightly worse. Pure copper has extremely high corrosion resistance. After a certain period of use, a layer of green oxide appears on the inner surface. But basically no effect on the life of the pipe, the flow rate, and the resistance to the fluid. The patina is harmless to human health and has a certain ability to kill bacteria. There are two types of plastic copper tube installation methods: card sleeve type and welding type. Welding type is more reliable.
Copper tubes, stainless steel tubes: In addition to the poor thermal insulation properties of these types of tubes, other indicators such as strength, life-span resistance to fluids, etc. are all very good, and should be set as cold water piping. If used for hot water transportation, insulation jacket should be added. The main connection method is card sleeve type, and the copper tube can also be welded. Inner enamel galvanized cast iron pipe: It is a layer of plastic in the inner wall of ordinary galvanized pipe, which makes it have the characteristics of corrosion resistance, low resistance, good insulation, and high strength of galvanized pipe itself. This tube is ribbed.
Plastic pipe: Plastic pipe can have sufficient strength, longevity, safety and hygiene as long as the material is selected to meet the standard requirements. It is a good insulation in all pipes. The plastic pipe adopts hot-melt welding and has a high degree of reliability. As long as the construction is correct, there will be no leakage and shedding at the pipe joint where the test pressure is normal.

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