Ductile Iron pipe has tremendous advantages in strength and carrying capacity. The greater inside diameter of Ductile Iron means that comparable head loss substitute hdpe pipelines require larger sized pipe to compete. Find out the many other advantages of Ductile Iron pipe over hdpe by following these links:

Ductile Iron Pipe versus HDPE Pipe
Direct Service Connection Installation Comparison: Ductile Iron Pipe vs. Polyethylene Pipe
Horizontal Directional Drilling with Ductile Iron Pipe
Hydraulic Analysis of Ductile Iron Pipe
DIPRA Seminars / Lectures
A Comparison of Engineering Considerations for Pressure Pipe

Take A Look At These Links To Find Out More

Why Ductile Iron Pipe is Superior to PVC Pipe
Why Ductile Iron Pipe is Superior to Steel Pipe
Why Ductile Iron Pipe is Superior to Concrete Pipe