This technical paper addresses claims made by the Ductile Iron Pipe Research Association (DIPRA) suggesting that ductile iron (DI) pipe has better hydraulic performance over the lifetime of the pipe compared to PVC.
https://www.uni-bell.org/Blogs/Pipe-Issues-Blog/Post/2425/Comparing-Pipe-Hydraulics-The-Importance-of-Equivalent-Pressure-Class-and-Declining-C-Factor-for-Ductile-Iron-DI-Pipe
Clipped from: web site