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Title: System Protection At Northern Illinois Gas Company
Author: Charles F. Walshon
Source: American Gas Association 1987
Year Published: 1987
Abstract: Our territory ranges from very rural to the concentrated suburbs of Chicago (see Figure 1). We have mains in parkways, alongside rural roads, and in areas of wall-to-wall concrete in builtup downtown areas. The majority of our customers are on high-pressure mains with the meter and regulators outside alongside the home, but some older areas still have lowpressure services with the meters inside. The Company system consists of approximately 25,000 miles of main. The bulk of the main is steel (96 percent). The remainder is cast iron (3.5 percent) and plastic (0.5 percent). There are approximately 1.5 million customers with approximately 20,426 miles of service pipe. The bulk of the services are steel (60 percent), copper and aluminum-lined plastic (38 percent), and plastic tubing (2 percent). We are currently adding between 20,000- 30,000 customers per year.

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