Which material resists sulfuric acid best for sewer lines?

Which material resists sulfuric acid best for sewer lines?

• A. Concrete lined pipe
• B. Polyethylene pipe
• C. Vitrified clay
• D. Cast iron pipe

Answer: (B)

Sulfuric acid in sewers is a common cause of corrosion, especially when hydrogen sulfide from wastewater is oxidized on surfaces like concrete. In that harsh, acidic environment, a pipe material that is chemically inert and not prone to rust or cement dissolution will last much longer. Polyethylene pipe fits this role well because its polymer structure is highly resistant to acids, so it doesn’t corrode or lose strength when exposed to sulfuric acid. Its interior is smooth and non-porous, which also helps resist fouling and ongoing chemical attack, keeping flow capacity stable over time. Concrete lined pipe relies on cement chemistry that the acid can dissolve, weakening the structure. Cast iron corrodes rapidly in acidic conditions, making it unsuitable where sulfuric acid is present. Vitrified clay has decent chemical resistance for many substances, but long-term exposure to sulfuric acid can still cause deterioration, making polyethylene the more durable choice in this scenario.

Sulfuric acid in sewers is a common cause of corrosion, especially when hydrogen sulfide from wastewater is oxidized on surfaces like concrete. In that harsh, acidic environment, a pipe material that is chemically inert and not prone to rust or cement dissolution will last much longer. Polyethylene pipe fits this role well because its polymer structure is highly resistant to acids, so it doesn’t corrode or lose strength when exposed to sulfuric acid. Its interior is smooth and non-porous, which also helps resist fouling and ongoing chemical attack, keeping flow capacity stable over time. Concrete lined pipe relies on cement chemistry that the acid can dissolve, weakening the structure. Cast iron corrodes rapidly in acidic conditions, making it unsuitable where sulfuric acid is present. Vitrified clay has decent chemical resistance for many substances, but long-term exposure to sulfuric acid can still cause deterioration, making polyethylene the more durable choice in this scenario.