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Title: Effect Of Elevated Ground Temperature From( Electric Cables) On The Pressure Rating Of Pe Pipe In Gas Piping Applications
Author: Dr. Gene Palermo,Z. Jimmy Zhou,Robert Farnum
Source: American Gas Association 2007
Year Published: 2007
Abstract: New underground high voltage electric cables can increase the average annual temperature of the soil at typical burial depths of about three feet. Older electric cable systems were designed with significant margin, therefore, they operated at a level significantly lower than their maximum capacity. Operating at such a lower level resulted in a significantly lower conductor temperature, and because of this lower conductor temperature, there was a lower heat flux to impact surrounding utilities. To reduce overall costs, while maximizing circuit ratings, todays electric cable systems are designed to operate much closer to their limit. Therefore, the actual conductor temperatures are closer to the maximum value, and this is what is causing the increased heat flux to the surrounding utilities. If these electric cables are near buried PE gas pipes, this increased ground temperature could decrease the pressure rating of the PE pipe. This paper will explain how these calculations can be made

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