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Many residents have reached out to us with concerns about the water quality in their homes. According to a government monitoring report, the factory water meets all standards. However, some people still notice yellow or rusty water coming out when they turn on the tap. This issue often raises questions about the condition of the water supply pipes. In this article, we'll walk you through the common types of water pipes and explain why such problems might occur.
Currently, several types of pipes are used for water supply systems. These include galvanized steel pipes, welded steel pipes, ductile iron pipes, prestressed (self-stressing) reinforced concrete pipes, fiberglass pipes, copper pipes, stainless steel pipes, plastic pipes, and composite pipes. Each has its own advantages and disadvantages depending on the application and environment.
1. Galvanized steel pipes were once widely used but are now largely outdated. They come in two forms: cold-galvanized and hot-dip galvanized. Cold-galvanized pipes are prone to rust, scale buildup, and bacterial growth, which can lead to secondary water contamination. Due to these risks, the former Ministry of Construction banned their use in potable water systems starting June 1, 2000. Hot-dip galvanized pipes, while more durable, are typically used for fire protection systems rather than drinking water.
2. Welded steel pipes are known for their high strength, pressure resistance, and ability to withstand vibrations. Compared to cast iron or cement pipes, they are lighter and easier to handle. However, they are susceptible to corrosion, which reduces their lifespan and requires strict anti-corrosion treatments. These pipes are commonly used in large-diameter applications where high pressure or special conditions like crossing railways or rivers are involved.
3. Ductile iron pipes offer excellent mechanical strength and pressure resistance. They are also highly resistant to corrosion and feature flexible rubber ring joints that make installation easier. Their adaptability to different foundations makes them ideal for various environments. However, they are not suitable for areas with heavy dynamic loads, and larger diameter pipes tend to be more expensive than steel pipes. They are mainly used for secondary or branch water supply lines.
4. Prestressed and self-stressing reinforced concrete pipes are known for their durability and impermeability. They do not corrode or rot, and their inner walls resist scaling. However, they are brittle and can crack if not installed properly. A flat base is required during laying, and specific pipe sockets and foundations are needed. These pipes are often used in large-scale water distribution systems.
5. Fiberglass pipes, also known as glass fiber reinforced resin pipes, are lightweight, corrosion-resistant, and easy to install. However, they have low rigidity and require a stable foundation. They are more commonly used in raw water pipelines rather than in standard water supply networks.
6. Copper pipes are valued for their stability, strength, and antibacterial properties. However, they are expensive, harder to weld, and conduct heat quickly. As a result, they haven't been widely adopted in China's water supply systems despite their benefits.
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