Ductile Iron Pipe Research Association - DIPRA

The Design Decision Model™ for Corrosion Control of Ductile Iron Pipe: To better serve the water and wastewater industries, the Ductile Iron Pipe Research Association ('DIPRA') and Corrpro Companies, Inc. have jointly developed a practical, cost effective corrosion control solution, the Design Decision Model™ (DDM™) that both DIPRA and Corrpro use as an engineering tool to address corrosion on proposed Ductile Iron transmission and distribution pipeline projects. The two-dimensional DDM™ incorporates a comprehensive system of corrosion control recommendations. The result is a highly effective, economical corrosion control strategy that gives utility managers confidence that the pipelines they install tomorrow will provide the reliable service they insist upon for their customers.

Cast Iron Pipe Century Club (Member List): The Cast Iron Pipe Century Club recognizes utilities with Cast Iron pipe that has provided continuous service for 100 years or more. Ductile Iron pipe has superseded Cast Iron pipe, but DIPRA continues to sponsor the Cast Iron Pipe Century Club as a salute to utilities for a job well done. This downloadable PDF file contains a listing of the members of this club.

Cement-Mortar Linings for Ductile Iron Pipe: This publication discusses the historical development of cement-mortar linings. Methods of application as well as properties of cement-mortar linings are also discussed. The hydraulic advantages of Ductile Iron pipe with cement-mortar linings are discussed, and tables are provided which detail the results of 64 flow tests that have been conducted on pipe ranging in service age from new to 77 years.

Linings Available for Ductile Iron Pipe: This data sheet lists many of the linings that are available for Ductile Iron pipe and lists the maximum service temperatures and common uses.

Polyethylene Encasement: Effective, Economical Protection for Ductile Iron Pipe in Corrosive Environments: This brochure briefly presents the history and development of polyethylene encasement, explains how it protects Ductile Iron pipe and highlights field investigations across North America. It also discusses polyethylene's advantages over other corrosion control methods, explains how to determine if protection is warranted, outlines proper installation procedures and briefly reviews cost considerations when choosing a corrosion-protection system for Ductile Iron pipe.

Stray Current Effects on Ductile Iron Pipe: DIPRA has for many years conducted research on the effects of electrolytic corrosion on both bare and polyethylene encased Ductile Iron pipe. This paper presents some of the findings obtained from these investigations of stray current influence as they apply to Ductile Iron pipe in the vicinity of impressed current cathodically protected pipelines.

The Effect of Overhead AC Power Lines Paralleling Ductile Iron Pipelines: Sharing of rights-of-way by AC power lines and buried pipelines has become quite common. This trend is mainly due to the numerous restraints imposed by private and governmental agencies concerning the routing and the environmental impact that construction of such facilities has on a given area. This sharing of rights-of-way raises the question as to the effect overhead AC power lines have on buried pipelines.

CORROSION CONTROL