Rhode Island Journeyman Plumber Practice Exam

The effectiveness of PVC (Polyvinyl Chloride) pipe for drainage purposes stems from its excellent properties, such as resistance to corrosion, ease of installation, and lightweight nature. PVC is non-reactive, which means it can handle wastewater and various chemicals without degrading over time. Its smooth interior surface allows for efficient flow of liquids, reducing the risk of clogs. Furthermore, PVC is cost-effective and widely available, making it a popular choice among plumbers for both residential and commercial drainage systems.

In contrast, while cast iron has been traditionally used for drainage, it can be heavy, more expensive, and prone to rust over long periods. Steel pipes are typically not preferred for drainage due to their susceptibility to corrosion unless they are specifically treated or galvanized, which can still be a disadvantage. Asbestos cement pipes were once used widely but have fallen out of favor due to health concerns related to asbestos exposure. Thus, PVC stands out as the most effective and practical choice for drainage applications.