A three-year study of tubercle formation, the most common cause of cast-iron pipe failure, revealed that the accumulation rate was fastest during the first year as compared to the following two years. The study revealed that there was no relationship between tubercle height and corrosion/pitting depth on the pipe wall. (Credit: Schekinov Alexey Victorovich/Wikicommon) A three-year study of tubercle formation, the most common cause of cast-iron pipe failure, revealed that the accumulation rate was fastest during the first year as compared to the following two years. The study revealed that there was no relationship between tubercle height and corrosion/pitting depth on the pipe wall. (Credit: Schekinov Alexey Victorovich/Wikicommon)

Editor's Note: Part one of this series covered the basics of sanitary drains and their connections as well as typical points of failure.

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