Renewing gas mains using CIPP liners continues to be an expanding trenchless solution for the gas industry in North America. While the dead of winter is not the best time for applying this renewal technique since gas loads are at their peaks and supply issues can occur when mains are out of service. Yet, for circumstances beyond anyone’s control the renewal of nearly 700 feet of leaking 16-inch diameter high pressure (HP) cast iron (CI) gas main needed to take place in early January, 2011. The job was well-planned in advance. A unique Carbon FRP laminate was designed and tested for this one-of-a kind application for bridging a 24-inch drip pot located under RR tracks that could not be removed. Nevertheless, many unforeseen circumstances and weather-related issues contributed to make this an extremely difficult job to successfully complete. The issues required many on-thespot decisions, “audible” calls and field solutions that needed to be properly executed in order to get the main gas main back in service without delay. This paper will review this specific job from a planning, testing and scheduling perspective to its final installation, including various unforeseen problems faced and resultant solutions employed, including regulatory issues, and lessons learned.
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