The purpose of this technical committee report is to review dataon corrosion and corrosion protection of ductile and gray cast-ironpipe from literature in the U.S. and abroad (gray-iron pressurepipe is no longer produced in North America). Throughout thisreport, gray cast iron is referred to as "cast iron." The followingsubjects are covered in this technical committee report:
â€¢ Engineering practices with respect to ductile- and cast-ironpipe;
â€¢ Reported protective measures and results obtained by theiruse;
â€¢ Influence of the different properties of the two types of ironpipe; and
â€¢ Case histories of installations spanning decades in a widerange of soils.
This report provides the user, owner, engineer, contractor, andother interested parties with technical and general information asto the state-of-the-art with regard to understanding techniques andmethods used to mitigate corrosion of iron pipe and fittings. Itincludes discussions of both historical and recent practices inwhich corrosion is a potential problem. This technical committeereport is not a standard, and as such, it does not cover compliancewith any particular specifications, although specifications andstandards are cited as references.
There are a variety of opinions concerning the benefits ofvarious corrosion control systems for cast- and ductile-iron pipe,which are discussed in pertinent sections of this report. Eachmethod or technique presents the designer and the user withnumerous factors that have an impact on installation and operatingcosts. It is intended that the reader use the report in itsentirety and use the information as well as the cited resourceswhen he or she makes decisions about corrosion control for his orher particular situation, and that he or she finds this report auseful source of information and an engineering tool in makingdecisions associated with corrosion protection.
This report was originally prepared in 1992 by NACE Task GroupT-10A-21, a component of Unit Committee T-10A, "CathodicProtection." It was revised in 2012 by Task Group (TG) 014,"Corrosion Control of Ductile and Cast Iron Pipe." TG 014 isadministered by Specific Technology Group (STG) 35, "Pipelines,Tanks, and Well Casings," and is sponsored by STGs 02, "ProtectiveCoatings and Liningsâ€”Atmospheric," 03, "Protective Coatings andLiningsâ€”Immersion/Buried," 05, "Cathodic/Anodic Protection," and39, "Process Industryâ€”Materials Applications." This report ispublished by NACE under the auspices of STG 35.