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Title: Cost/Benefit Assessment Of 8 Diameter Plastic Vs. Steel Piping
Author: John C. Place
Source: American Gas Association 1992
Year Published: 1992
Abstract: Wisconsin Natural Gas Company installs medium density polyethylene pipe for mains and services 6 diameter and smaller. WN recently considered use of 8 PE as an alternative to installing 8 wrapped steel main. As with smaller diameters, the installed cost of 8 PE is significantly less than that of wrapped steel main of the same nominal size. A comparative cost/benefit assessment of plastic and wrapped steel, sizes 2 through 8, showed that steel has an increasingly significant advantage over PE main in terms of deliverability as the nominal size increases. This is a result of the more pronounced increase in the wall thickness of PE pipe, and thereby, smaller inside diameter of PE compared to steel pipe. WNs assessment showed that 8 wrapped steel and 8 PE are approximately equivalent in terms of deliverability per dollar of installed cost. Based on this and other factors, WN chose not to initiate the use of 8 PE at this time.

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