Which pipe is commonly used for water service in sanitary drainage systems?

The correct choice is PVC, which stands for polyvinyl chloride. This material is widely used in plumbing systems for various applications, including sanitary drainage. One of the primary reasons for using PVC in water service is its durability and resistance to corrosion, which allows it to perform effectively over time without the risk of rust or decay commonly associated with metal pipes like galvanized steel and cast iron. Additionally, PVC is lightweight, easy to handle, and installation is typically more straightforward and less labor-intensive compared to heavier materials.

Moreover, PVC pipes have smooth interiors, which aids in reducing friction loss and preventing blockages, promoting efficient flow in drainage systems. They are also cost-effective, making them a popular choice among plumbers and contractors.