What type of pipe is commonly used for drainage systems?

In drainage systems, both PVC and cast iron pipes are utilized due to their distinct properties that make them suitable for handling wastewater and drainage applications.

PVC (Polyvinyl Chloride) pipe is lightweight, resistant to corrosion, and easy to install, making it a popular choice for residential and commercial drainage systems. Its smooth inner surface helps in the efficient flow of wastewater while minimizing the risk of clogs.

On the other hand, cast iron pipe has been used in drainage for many years because of its strength and durability. It can withstand high temperatures and pressures, making it suitable for heavy-duty applications, including underground installations where soil pressure is a concern. Cast iron also has sound-dampening properties that reduce noise from flowing water, making it a preferred choice in certain urban settings.

By combining the advantages of both PVC and cast iron, drainage systems can achieve optimal performance, reliability, and longevity, hence the selection of both materials in the answer.