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Title: Retention Of Cast Iron Gas Mains Adjacent To Foreign Trenches
Author: Arthur A Shapiro
Source: American Gas Association 1988
Year Published: 1988
Abstract: The Brooklyn Union Gas Company is maintaining, rather than replacing, many 4 to 8 low-pressure cast iron gas mains adjacent to parallel trench construction. We would have replaced these mains in the past. Instead, we are demonstrating new procedures to maintain these mains under a three-year New York State Public Service Commission rule waiver. This paper provides an account of the Cast Iron Retention Program (CIRP) at Brooklyn Union. The new procedures resulted from research managed by Brooklyn Union and performed at Cornell University. The New York Gas Group, a trade organization of natural gas distributors in New York, sponsored the project. The research produced a field-usable replace/retain decision guide. The guide criteria are based upon the mechanical properties of the cast iron pipelines, predicted pipeline response to construction, and identification of conditions that could cause unacceptable levels of strain. Brooklyn Union has retained 35,000 feet of main in the first twelve months of the program (since March, 1987), avoiding S2.8 million of capital construction and 750,000 of related operating and maintenance expenses.

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