Renewing gas mains using CIPP liners continues to be an expanding trenchless solution for the gasindustry in North America. While the dead of winter is not the best time for applying this renewal technique sincegas loads are at their peaks and supply issues can occur when mains are out of service. Yet, for circumstancesbeyond 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 CarbonFRP laminate was designed and tested for this one-of-a kind application for bridging a 24-inch drip pot locatedunder RR tracks that could not be removed. Nevertheless, many unforeseen circumstances and weather-relatedissues contributed to make this an extremely difficult job to successfully complete. The issues required many on-thespotdecisions, “audible” calls and field solutions that needed to be properly executed in order to get the main gasmain back in service without delay. This paper will review this specific job from a planning, testing and schedulingperspective to its final installation, including various unforeseen problems faced and resultant solutions employed,including regulatory issues, and lessons learned.
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