I would like to ask the teachers: What are the properties of galvanized pipes, and in what types of media are they generally used? Which media cannot it be used with?

Galvanized pipes are used in various applications; the iron pipes used for gas and heating systems are also of this type. When used as water pipes, galvanized pipes develop a large amount of rust after a few years of use. The yellowish water that flows from them not only contaminates plumbing fixtures but also contains bacteria that grow on the rough inner surfaces. The rusting process leads to high levels of heavy metals in the water, posing a serious threat to human health. In the 1960s and 1970s, developed countries around the world began to develop new types of pipes, and gradually phased out the use of galvanized pipes. Four ministries and commissions, including China’s Ministry of Construction, have also issued regulations prohibiting the use of galvanized pipes starting in the year 2000. Nowadays, galvanized pipes are rarely used for cold water pipes in newly built residential complexes; however, they are still used for hot water pipes in some of these complexes.

Galvanized pipes are simply ordinary steel pipes coated with a layer of zinc to prevent corrosion.

It is generally used for urban heating, as well as for the transportation of gas and low-pressure air; it is also employed in wiring ducts during installation

To improve the corrosion resistance of steel pipes, ordinary steel pipes (black pipes) are galvanized. Galvanized steel pipes are divided into hot-dip galvanized and electro-galvanized types. Uses: 1. Oxygen welding pipes for steelmaking; 2. Wire insulation tubes; 3. Generally used as structural components, such as drive shafts, or for transporting fluids; 4. Idler tubes for belt conveyors; 5. Transformer tubes; 6. Components for agricultural machinery, steel windows and doors, etc.; 7. Used in manufacturing furniture, toys, lighting fixtures, etc.; 8. Used to produce spiral welded pipes, primarily for transporting oil and natural gas. Common misuse mistakes: 1. Water pipes: After several years of use, a large amount of rust forms inside the pipes. The yellowish water that flows out not only contaminates sanitary fixtures but also contains bacteria that grow on the rough inner surfaces. The rusting leads to high levels of heavy metals in the water, posing a serious threat to human health. In the 1960s and 1970s, developed countries around the world began to develop new types of pipes, and gradually phased out the use of galvanized pipes.

Galvanized pipes are generally welded steel pipes, designed for use under pressures of less than 1.6 MPa; carbon steel pipes are mostly seamless pipes and have a wide range of applications； Galvanized pipes don’t have any special features; their advantage is simply their low price and low cost

Galvanized pipes are welded pipes used for transporting water gas, with a working pressure of less than 1.6 MPa. In industrial installations, it is mainly used in utility systems such as fresh water pipes, purified air, and unpurified air pipelines. The conduit for electrical appliances and instruments is mainly galvanized pipe.

Currently, galvanized pipes in the chemical industry are mostly used for instrument air and water pipelines. Generally speaking, galvanized pipes are seam pipes, while carbon steel pipes are mostly seamless pipes (though some are also seam pipes). The sizes of galvanized pipes are generally in imperial units, such as 1/2, 3/4, 1, 11/2, etc. Welding is not typically used; instead, pipe threads are employed for connection. There are various corresponding pipe fittings available, including tees, elbows, reducers, couplings, and so on.

Zinc is more chemically reactive than iron; during electrochemical corrosion, zinc corrodes first rather than iron. Moreover, zinc oxide is relatively dense, which prevents further oxidation. Therefore, galvanized steel pipes generally have good corrosion resistance.

Regarding the 10th floor issue, both the inner and outer walls are galvanized.