Trenchless Technology

SEP 2018

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ing , as well ," Carter said. " We still do use ductile iron pipe when doing open cut . But we've gone from 100 percent ductile iron 10 years ago to about 10 to 15 percent now. We put together 80 to 100 ft of assembled pipe and when it 's closer to the pit , we put on additional 20-ft segments of pipe un- til we're through with bursting . That helps us keep our overall footprint re- ally small ." " In a static pipe bursting applica- tion, segmented pipe, like the pipe WaterOne is installing , is assembled one joint at a time in a 'cartridge load- ing ' process. It is well suited for loca- tions where available space for pipe lay down is not available," Abell said. "Segmented or sectional pipe can be roughly placed into two categories, restrained joint and non-restrained joint . Each type requires a different approach when used in conjunction with static bursting . Installing sec- tional pipes with restrained joints through static pipe bursting requires a speciˆic bursting head to connect to the product pipe and then to the static pipe bursting tooling . Nothing ad- ditional is required. Subsequent sec- tions of the restrained joint pipe are assembled during the bursting pro - cess as the pipe string progresses." According to Carter, most of the area's road crossings and services are copper and don't need to be replaced. Occasionally, crews come across some old PVC or galvanized steel . Those ser- vices are replaced through horizontal boring with a piercing tool or in some cases, directional drilling . The utility is also currently renting a Grundopit pit launched directional drill from TT Technologies and intends to use it on upcoming service replacements. Residential Response Carter said customers have been re- ceptive to the infrastructure work and he attributes that to their in-house program. He said, " Because we're in- house, we have good contact with our customers," he said. " It 's not like a contractor trying to make arrange- ments with our customers. Almost our entire customer based has signed up for e-mail alerts through our " Notify Jo - Co" system. We can send out e-mail or computer-generated notiˆications to our customers and know they will receive them." Reaction to trenchless pipe burst- ing has also been positive. " The ˆirst kind of feedback we get is usually, 'Oh what 's that? ' But by the end of the job, once they understand what 's going on, they are very pleased that we did not tear up their driveway or landscaping ," Carter said. "As we move from street to street , we've had the neighbors from the street we just ˆin- ished telling the next group of neigh- bors about the process and pointing things out . Really positive customer engagement ." " It 's been great watching this group becoming so proˆicient at bursting . Really good group of talented individ- uals getting things done," Abell said. Jim Schill is a technical writer in Mankato, Minnesota. W W W.T R E N C H L E S S T EC H N O LO GY.C O M 51

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