Aging infrastructure is the primary problem in the water and wastewater sector. In long-term projects like pipe replacement, where the service life may exceed 100 years, the correct material selection is crucial. Common sewage pipes are: Ductile iron pipe, Steel pipe, HDPE pipe, PVC pipe. Due to the different characteristics of pipe materials, HDPE sewage pipes have become an excellent substitute for steel pipes and ductile iron pipes, and are widely used in factories, municipalities, and mining sewage projects.
1. Cast-iron pipe
Cast-iron pipe, which is the predecessor of ductile iron, is part of the infrastructural backbone of country. Currently, more than 600 municipalities boast 100-year-old working cast-iron pipe systems, and more than 20 have pipe that’s reached the 150-year mark.Primarily used on the water side, ductile iron is a cast product manufactured almost entirely from ferric scrap. It’s held up very well, if the infrastructure needs to be rehabilitated that ductile iron would offer a similar or better service than cast iron. For ductile iron pipe, the sewer can be more challenging, so special internal pipe linings are sometimes required.
Steel pipe, which has a long history of use in the United States, and has been recognized for its excellent resistance to high internal pressures and pressure surges. Large-diameter steel piping is most often used in pressure pipes for water and wastewater applications. It can be made using three methods: seamless, welded and casting mold. Like other metal pipes, steel is prone to corrosion, so it is lined with an asphalt coating when used in water mains to protect against acidic water. This also retains its good flow characteristics. The drawback to the various coatings and linings is that they can be damaged during installation. Steel’s primary benefit is brute strength. Cracking typically doesn’t occur, and under abnormal loads, the material bends rather than breaking.
Borrowing technology first used by the gas and oil industry, high-density polyethylene pipe has also become a popular choice for water and wastewater applications because of its noncorrosive, highly flexible characteristics. Also, its heat-fused joints mean zero water loss, which is an important quality as worldwide water value increases.
This fusion process creates an unbreakable bond and a joint as strong as the rest of the pipe. HDPE is also highly resistant to corrosion and has a low failure rate, which further decreases life span costs. Proper planning, design, installation and inspection are essential when using HDPE.
HDPE pipe has flexibility and ductility, whtich capably withstood tremendous seismic activity. In the 2010 Chile earthquake, for instance, “while the rest of the water system suffered thousands of damaged pipes, no HDPE pipe was damaged.” The report recommends HDPE for common distribution pipes and service laterals in high seismic zones.
HDPE is available in sizes from 1/2 to 65 inches, covering everything from service lines to distribution and transmission mains. Its use has expanded across Europe, and according to, nearly 90 percent of new pipe installations in Europe are HDPE.
So HDPE pipe is the best choice for factory sewage system. Puhui can provide 12mm-1800mm HDPE sewage pipe. Puhui HDPE sewage pipes are widely used in sewage treatment projects in various countries, such as the Philippines, Chile, UAE, Mongolia, Malaysia, Sri Lanka, etc.