Trenchless Technology

OCT 2018

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W W W.T R E N C H L E S S T EC H N O LO GY.C O M 31 excavation alone – not including re- pairing the joints – would range from $40,000 to $50,000. Ragula knew a trenchless solution was needed. PSE&G uses the sliplining process for many projects; however, the utility needed to maintain the 15 pounds per square inch gauge (psig ) capacity on this main and thus was ruled out . " In addition to its proximity to the university and being a heavily- traf- icked roadway, the feeder main shares a crowded subsurface space. This in- cludes a telephone facility with tile ducts, water, two sewers, cable and a parallel 12-in. low pressure main," Ra- gula says. " The only viable and cost- effective approach that would guaran- tee minimal disruption was trenchless renewal using CIPL ." The CIPL main relining process is nothing new to Ragula, PSE&G and PPM. In the last 25 years PSE&G has relined several key sections of its dis- tribution network throughout the Garden State using this technology winning Trenchless Technology Proj- ect of the Year honors in 2011, and ty- ing a world record with a 30-in. Star- line install three years ago. "George [Ragula] approached us and said that PSE&G had a 36-in. critical feed near Seton Hall that had leaks and they knew they could save some money with this method," says David Wickersham, president and CEO of PPM. " We [PSE&G and PPM] approached Karl Weiss in Berlin, the patent holder of the Starline process, about what we would need to get it done." Though the overall project time- frame was a little more than two months – Sept . 5 to Nov. 19, 2017 – the planning and equipment pro - curement that went into this arduous project took more than half the year to plan. PPM beefed up its vacuum capabili- ties – necessary to remove the sand- blasted grit and scale from inside the 2,000 ft stretch of pipe – and procured a larger inversion cone and pressure drum from Karl Weiss that was ap - proximately the size of a 12-ft box truck. " From an operational perspective, everything we have learned in our 16 years did not give me any pause on designing this project and complet- ing it successfully," Wickersham says. " Based on our experience and based on the strong partnership with PSE&G and Karl Weiss, we really didn't have any pause in going after this." The project included four lining segments – segment one, 650 ft; seg- ment two; 565 ft; segment three, 450 ft and segment four, 260 ft – and one PSE&G and Progressive Pipeline Management devised a series of vacuum trucks to create a Venturi system to remove the silt and grit from the pipe cleaning process in advance of the relining.

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