What type of pipe consists of one or more steel cages of welded wire fabric of helically wrapped rods welded to longitudinal rods?

• A. PVC pipe
• B. Ductile iron pipe
• C. Reinforced concrete noncylinder pipe
• D. Steel pipe

Answer: (C)

Reinforced concrete noncylinder pipe is built with steel reinforcement cages made of welded wire fabric and helically wrapped rods welded to longitudinal bars. Concrete is then poured around this cage, forming a pipe with a noncircular cross-section. This reinforcement arrangement—one or more steel cages with helically wrapped rods welded to longitudinal rods—is a defining feature of RCNP, setting it apart from PVC, ductile iron, or standard steel pipe, which are either plastic or cylindrical metal pipes without this noncircular reinforced cage construction.