The nominal outer diameters of PVC pipes are: (unit mm) 2.5, 3, 4, 5, 6,...355, 400, 450, 500, 560, 630, 710, 800, 900, 1000, etc.; the inner diameter is generally

It's 50mm.

PVC-U pipes have strong corrosion resistance, are easy to bond, are cheap and hard in texture.

However, due to the leakage of PVC-U monomer and additives, it is only suitable for water supply systems with a delivery temperature not exceeding 45°C. Plastic pipes are used for drainage, wastewater, chemicals, heating and cooling fluids, food, ultrapure liquids, mud, gases

, compressed air and vacuum systems.

Extended information: Advantages of PVC pipes: 1. It has good tensile and compressive strength: but its flexibility is not as good as other plastic pipes.

2. Small fluid resistance: The pipe wall of PVC-U pipe is very smooth and has very little resistance to fluid. Its roughness coefficient is only 0.009. Its water transport capacity can be 20% higher than that of cast iron pipes of the same diameter and 40% higher than that of concrete pipes.

%.

3. Excellent corrosion resistance and chemical resistance: PVC-U pipes have excellent acid resistance, alkali resistance, corrosion resistance, and are not affected by moisture and soil pH. No anti-corrosion treatment is required when laying pipes.

4. Good water tightness: The installation of PVC-U pipes, regardless of whether they are connected by bonding or rubber rings, has good water tightness.

5. Anti-gnawing: PVC-U pipe is not a nutrient source, so it will not be eroded by rodents.

According to tests conducted by the National Sanitation Foundation in Michigan, rats will not bite PVC-U pipes.