Copper water pipe
Copper pipes have a long history of being used as water supply pipes. They are proven to be durable and have a long life. In developed countries, copper water pipe systems account for a large proportion. The application technology of copper water pipes is very mature abroad and should be widely used. Copper pipes and pipe fittings have complete standards and various interface methods.
Copper water pipes are made of TP2 copper with a purity of 99.9% and are seamless pipes drawn by cold extrusion. The pipes combine the advantages of metal pipes and non-metallic pipes. The pipes are hard and strong, with a tensile strength of >205~315 MP, stable chemical properties, not easy to corrode, good mechanical properties and good ductility, and can well solve the non-standard turning problems of arc loops such as gymnasiums, hotels, and hospitals.
Copper has super antibacterial and antibacterial properties, and can kill a variety of bacteria including Candida albicans, Escherichia coli, Legionella, etc. Copper ions (charged particles) can prevent cell respiration, punch holes in bacterial cell membranes or destroy virus shells, and destroy internal DNA and RNA, causing them to die, ensuring the cleanliness of drinking water and avoiding secondary pollution.
The organizational structure of copper water pipes is extremely dense, and neither grease, bacteria, viruses, oxygen, nor ultraviolet rays can pass through it to pollute the water quality.
Copper water pipes can be recycled and reused. One-third of the copper in China can be recycled and reused every year. Compared with other pipes, the main obstacle to its application is the price.
Blue water from copper pipes: Any kind of metal will be eluted with a small amount of metal ions by contact with water. The same is true for copper pipes, which will be eluted with a small amount of copper ions by contact with water. Although we occasionally hear that blue water comes from copper pipes, this is not the case. As shown in Figure 1, the content of copper ions in water gives it a blue appearance. For the water to become blue, elution requires at least 100ppm.
In Japan, the water quality standard for the allowable copper content is set at 1ppm. Therefore, the copper ions eluted from copper pipes are less than 1ppm, and the color of the water is not actually blue.
However, occasionally blue water is found in the bathtub or wash basin, and people often confuse it to think that the blue water comes from copper pipes. In fact, this is because a small amount of copper ions (less than 1ppm) react with soap or fatty acids in the dirt and produce an insoluble blue substance (copper soap), which can be removed by using kitchen grease cleaner and wiping with a sponge.
Copper pipe patina: Patina is a complex salt formed on the surface of copper by sulfur dioxide, carbon dioxide and hydrogen sulfide in the atmosphere and copper oxide. The content of sulfur dioxide, carbon dioxide and hydrogen sulfide in drinking water that meets my country's drinking water quality standards is extremely small, and the ionization potential of copper in water is positive and will not be replaced by hydrogen ions in the water, so it is difficult for verdigris to form on the inner wall of copper water pipes.
