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Title: Predicting The Service Life Of Cast Iron Mains
Author: James m. Iocca, Robert D. Pehlke
Source: American Gas Association 1987
Year Published: 1987
Abstract: There are hundreds of thousands of miles of buried cast iron pipe stili in service in the United States, serving mainly to distribute natural gas and water. Most of this pipe is over 50 years old, with some of it well in excess of 100 years old. It has provided excellent service over the years, but now, because of the gradual deterioration, pipe breaks and joint leaks are occurring with increasing frequency. These failures are mainly attributable to the combined effects of soil type, pipe and joint material, methods used to support the pipe, traffic, weather (particularly where frost action is prevalent), and the age and size of the pipe. Because of the increasing number of cast iron pipe breaks and joint leaks, gas utility management is faced with difficult choices - whether to repair and renovate, replace (which would require very large sums of capital), or consider a combination of the two. In some systems, mains may have already reached critical age (when failures tend to increase). In others, the critical age may be far into the future. Management, therefore, must have a complete understanding of the current status of their systems as well as of the probable future condition to make prudent and cost-effective repair/replacement decisions.

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