Trenchless Technology

OCT 2018

Trenchless Technology is the premier communications vehicle for the trenchless industry. Through our multiple platforms, readers receive insights into the trenchless industry, as well as keep connected to the latest news, products and projects.

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24 T R E N C H L E S S T EC H N O LO GY O C TO B E R 2018 project] going ," he says. "Otherwise, if we can't keep up with our luids and we have to stop forward progress, we are no longer making production. This system, allows us to maintain penetra- tion and hole cleaning abilities so we can maintain production and forward progress." Hotz explains that the cleaning system is a closed loop system that is injected at the cutting head. " We're sucking it back in at the same location after it 's mixed with the materials and we've pumped it through internal hos- es back into the pipe and back to the surface to recycle it . We then send it back down for reuse." Jobsite safety was challenging at various stages of project construction. One area in particular dealt with the extended periods crewmembers spent in the pipe and the conined space entry safety measures put into place to protect them. Crews are sent into the pipeline using an electric cart and rail systems when required to perform veriication surveys of the steering components in the head. " There were nine conined entries for this project ," Hotz says. "And depending on how far in the ground we are in the tunnel , they can be every 500 to 1,000 ft , depending on the situation. Once we started tunneling and got the MTBM in the ground, we worked 24/7 in two shifts." The Laney team planned exten- sively for entry during the initial con- nection of the MTBM and at the end during the machine's removal from the pipeline. Laney also anticipated unplanned scenarios, from common repairs to mechanical and electrical fails. "Of the nine conined entries, the furthest entry was at a length of nearly 4,000 ft into the pipeline," Hotz says. "All entries were made safely with- out negative results or safety break- downs." Working on a remote location on a water crossing is also tricky. Hotz notes that on any given day, depend- ing on which way the wind was blow- ing and the high tides, the work areas would be inundated with water and unusable, forcing crews to regroup and use the other dock. This project marked Laney 's 11th Direct Pipe installation since it added this trenchless method to its toolbox of installation methods. This project gives Laney the record for total pipe- line installed via Direct Pipe in North America with 23,000 ft . " We're absolutely so excited about having this project selected as the Project of the Year," Hotz says. " It was a great achievement for us and for Direct Pipe. We've had a lot of suc- cess with Direct Pipe where HDD just wasn't the right answer. We know it 's not going to be a replacement for HDD. But where it makes sense, we're excited that we have this tool at our disposal to meet clients' needs." Sharon M. Bueno is managing editor of Trenchless Technology. Project Owner: Enbridge and Valley Crossing Pipeline LLC Engineer: Laney Directional Drilling Contractor: Strike LLC (general) and Laney Directional Drilling (sub) Mfg./Suppliers: Herrenknecht and Derrick Corp. Value of Trenchless Project (US$): $14.2 million The Laney Directional Drilling project management team.

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