What type of pipe is commonly used for drainage systems?

Cast iron pipe is commonly used for drainage systems due to its durability and excellent resistance to corrosion and high temperatures. The weight and strength of cast iron make it suitable for carrying wastewater and sewage over long distances without the risk of damage. Its ability to withstand the weight of soils and heavy traffic makes it ideal for underground installations often encountered in drainage applications.

In addition to structural integrity, cast iron has sound-dampening properties that help reduce noise from wastewater flow, a desirable characteristic in residential and commercial plumbing. Meanwhile, although other types of pipes, such as PEX and CPVC, have specific applications in plumbing, they are typically not suited for drainage systems, particularly for heavier waste, due to their limitations in temperature and pressure resistance. Polyethylene pipe, while flexible and resistant to corrosion, is more often used in applications like irrigation and potable water rather than in traditional drainage setups.