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Many people have reached out to us with concerns about their tap water. According to a government monitoring report, the factory water meets all standards. But why does your tap sometimes release yellow or rusty water? In this article, we’ll explore the issue of water supply pipes and why it might be affecting your home’s water quality.
Today, various types of pipes are used in water supply systems, including welded steel pipes, galvanized 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 limitations depending on the application.
Galvanized steel pipes were once commonly used for water supply. However, cold-galvanized pipes tend to rust, accumulate scale, and even harbor bacteria, leading to secondary water contamination. That's why the former Ministry of Construction banned their use in potable water systems from June 1, 2000. Hot-dip galvanized pipes, while more durable, are mainly used for fire protection and irrigation systems due to their higher resistance to corrosion.
Welded steel pipes are strong, pressure-resistant, and lightweight compared to cast iron or concrete pipes. They also have fewer joints and are easier to process. However, they are prone to corrosion if not properly insulated, which can shorten their lifespan. These pipes are often used in high-pressure areas or where large diameters are required, such as under roads, rivers, or in earthquake-prone zones.
Ductile iron pipes offer high strength, good corrosion resistance, and flexible rubber ring connections that make them easy to install. They adapt well to different ground conditions and are ideal for secondary water supply lines. However, they are less suitable for areas with heavy dynamic loads, and larger sizes can be more expensive than steel pipes.
Prestressed and self-stressing reinforced concrete pipes are known for their durability and resistance to corrosion. Their inner walls don’t scale, and they’re perfect for large-scale water distribution. However, they are brittle and require careful installation with flat foundations and proper joints. These are typically used in major water delivery projects.
Glass fiber reinforced plastic (FRP) pipes are lightweight, corrosion-resistant, and easy to install. However, they have low rigidity and require stable foundations. They are more commonly used in raw water intake systems rather than municipal water networks.
Copper pipes are highly durable and have natural antibacterial properties, making them ideal for clean water systems. However, they are costly, harder to weld, and conduct heat quickly. Due to these challenges, they haven't been widely adopted in China's water infrastructure yet.
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