Concrete Pipe for Sanitary Sewers Corrosion Protection Updateby Kenneth K. Kienow, Kienow Associates, Inc, Redlands, United States,
H. Cecil Allen, Kienow Associates, Inc, Redlands, United States,
Abstract: Significant advances have been made in the last decade in the area of sanitary sewer design techniques. Some of the most important advances have been in the prediction and prevention of sulfide related odor and corrosion problems in collection systems. In spite of these advances, however, failure to understand or properly assess the corrosion and odor potential continues to result in costly and wasteful over conservatism in design on the one hand, and inadequate protection on the other. Failure to understand the mechanisms involved in the corrosion process has led to the unnecessary rehabilitation or replacement of large diameter concrete pipe because major damage occurred in isolated areas subjected to unusual conditions where spot repairs and minor system operation changes would have extended the life for decades. Some of the misunderstood phenomena which have often led to unnecessary major expense or premature failure are discussed, together with the recent Congress-mandated EPA 'corrosion study' and the Los Angeles County Sanitation District corrosion problems which precipitated the EPA 'study'. Case histories of major sewers designed using corrosion resistant design techniques are presented.
Subject Headings: Corrosion | Concrete pipes | Sanitary sewers | Pipelines | Rehabilitation | Odors | Structural design | Case studies | Sulfides | North America | California | Los Angeles | United States
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