Texas Wastewater Class B Practice Exam

Which types of pipe are commonly used in wastewater collection systems?

1. Ductile iron

2. Poly Vinyl Chloride (PVC)

3. Steel

4. Concrete

The correct answer is: Ductile iron

Ductile iron is indeed a common choice for wastewater collection systems due to its strength and durability. It is particularly effective in handling the high pressures and aggressive environments often encountered in wastewater applications. Ductile iron pipes have the capability to withstand soil movement and are less susceptible to fracture than traditional cast iron, making them a reliable option for underground installations. Poly Vinyl Chloride (PVC) is also widely used in wastewater systems due to its lightweight nature, resistance to corrosion, and cost-effectiveness. Steel can sometimes be utilized for specific applications but is less common due to its susceptibility to corrosion unless properly coated. Concrete pipes are generally employed for larger diameter applications or specific conditions. Each of these materials has its own set of advantages and uses, but ductile iron is particularly favored for its robustness in the demanding conditions typical of wastewater systems.