What are the common materials used for sewer pipes?

The correct answer is based on the materials that are most commonly utilized in the construction and maintenance of sewer pipes. PVC (polyvinyl chloride), ductile iron, concrete, and clay are widely recognized for their durability, resistance to corrosion, and suitability for various sewer applications.

PVC is particularly favored due to its lightweight nature, ease of installation, and resistance to chemical degradation, making it an ideal choice for gravity-fed sewer lines. Ductile iron is known for its strength and reliability, often used in pressure applications and providing added durability against external loads. Concrete pipes are favored for their robust construction and longevity, and they’re commonly used in larger sewer systems. Clay pipes, while less frequent in modern installations, have a long history of use in sewer systems and provide excellent durability and resistance to chemical degradation.

These materials collectively represent the industry standards for sewer pipe construction, making option B the most accurate choice compared to the other materials listed in the other options, which are less common or unsuitable for sewer systems.