Which type of plumbing pipe is commonly used for drainage systems?

PVC pipe is commonly used for drainage systems due to its lightweight nature, corrosion resistance, and cost-effectiveness. Its smooth interior surface allows for effective water flow and minimizes the risk of clogging, making it an ideal choice for carrying wastewater and other liquids. PVC is also easy to handle and install, which adds to its popularity in plumbing practices.

Polyethylene pipe may be used in some applications, particularly in specific drainage contexts, but it is more suited for pressure applications rather than gravity-based drainage systems. Copper pipe is traditionally used for water supply lines and other applications where high strength and temperature resistance are needed but is less common for drainage due to its susceptibility to corrosion over time. Galvanized steel pipe, while historically used for plumbing, is now often avoided in drainage systems because it can rust and deteriorate, leading to leaks and blockages. Thus, PVC pipe stands out as the preferred material for modern drainage systems in plumbing.