Horizontal Directional Drilling and Boring

Horizontal Directional Drilling and Boring
Swagelining and pipe fusion team up to extend life of pipeline

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Swagelining and pipe fusion team up to extend life of pipeline

Problem: Murphy Pipeline Contractors of Jacksonville, Florida, was contracted to replace a 24-inch ductile iron sewer force main using swagelining, a pipe lining method that results in a tight-fit HDPE compressive liner inside a host pipe. The 2,200-foot force main was situated along a busy highway with limited space and an abundance of underground utility lines.

Solution: ISCO provided a self-propelled TracStar 900 machine from McElroy with powerful hydraulic clamping for efficient fusion of the pipe ends. JEA’s data logging requirement was met with usage of the McElroy DataLogger 6, which captured each step of the fusion process to ensure that joints were fused properly before installation. Once the amount of fused pipe equaled the pull distance, it was pulled through a reduction die. This temporarily reduced the size of the 24-inch DIPS HDPE pipe so that it could enter the existing ductile iron line. The flexibility of HDPE pipe allowed it to revert to its original size once the towing load was released.

RESULT: Approximately 92 percent less excavation was required with the swagelining technology, which reduced public and environmental disruption. The cost to remove and replace new sidewalks and driveways and the impact to the traveling public along with the Florida Department of Transportationroadway was also mitigated. Murphy’s six-man crew was able to fuse and pull a 2,200-foot pipeline within a single pull in three days. The HDPE pipe increased the force main’s flow rates and its corrosion- and leak-free qualities will result in a pipeline that will serve residents for up to 100 years. 918/836-8611; www.mcelroy.com

Rock saw takes on toughest coral shelf conditions

Problem: A contractor in Naples, Florida, had a job that consisted of drilling through a sedimentary/coral shelf, into an ancient seabed, then back up through the shelf. The customer was about halfway through a 450-foot bore and had broken through the first part of the sedimentary/coral shelf and into the soft, unstructured sand. When trying to push out of the sand, the OEM bit would not grab the coral and break through to finish the bore.

Solution: The contractor called Galloway Group, which specializes in HDD drilling supplies and distributes Melfred Borzall tooling. “The customer tried for about two hours but all the bit would do is slide forward under the shelf. It just wouldn’t grab and punch into the coral,” says Mike Barnett of Galloway Group. Barnett recommended the Rock Saw with conical cutters to grab the sedimentary shelf. “Normally we suggest the dome cutter for a smoother cut but in this circumstance, the conical cutters were the way to go when you break through into sand,” he says.

RESULT: After replacing the OEM with the Rock Saw, they drilled again to the coral shelf. The Rock Saw hit the shelf and immediately broke through the hard surface and drilled into the coral shelf. It continued to steer perfectly and the customer was able to complete the bore. 800/558-7500; www.melfredborzall.com


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