Ductile Iron Pipe Research Association
DIPRA provides engineering information about Ductile iron.
The Ductile Iron Pipe Research Association (DIPRA) serves as a resource and technical advisor to the water industry. This includes representation on standards-making committees, research on a variety of applications-based topics, personal technical services through DIPRA’s regional engineer program, and web-based calculators for designing and specifying Ductile iron pipe.