The project involved the homeowner’s 1-1/4-in. diameter HDPE water pipe that was leaking under the driveway. Calvin’s decided to replace the entire 65 ft via pipe bursting.
The standard TRIC waterline kit includes a splitting head designed to replace ¾- and 1-in. service lines made of copper and plastic. When Moreno arrived onsite, he and his client determined that the splitting head provided was a bit too small for the job. After a few conversations with TRIC senior trainer John Rafferty, Moreno directed Calvin’s to have a local machine shop bore out the end of the 1-in. waterline splitting head — originally designed for use with 3/8-in. cable — to enable it to slip over the 5/8-in. cable in front of the 2-in. standard TRIC head pipe bursting. Thus, the 1-in. splitting head acted as a pre-burster, first entering and opening the 1-1/4-in. pipe enough to allow the TRIC 2-in. head to follow behind. The 2-in. bursting head was outfitted with a 2- to 1-1/4-in. HDPE pipe reducer, which allowed Moreno and Calvin’s to proceed without an issue replacing the pipeline.
“The concern on the jobsite was if the 3/8-in. cable for the 1-in. head would break and if there would be enough annular space around the new pipe as the old pipe was split during the pipe replacement,” said Moreno.
Often, if there isn’t enough space surrounding the new pipe as it moves through the ground, the ground will put added drag on the cable and pipe. Since the 3/8-in. cable had only a 7-ton breaking strength, this was a concern on this particular upsize. The 5/8-in. cable used had a 23-ton breaking strength, providing a good safety factor for the 20-ton hydraulic puller.
The other concern on the job was that there was an electrical conduit line near the water service line. Moreno instructed Calvin’s to set up the TRIC puller at an angle in order to prevent touching that line. “Our technology is great; you can set up the pulley base and plate at an angle to avoid other utility lines and it still pulls like a champ,” said Moreno.
TRIC invented and patented the first Lateral Pipe Bursting System while simultaneously gaining national approval of HDPE pipe for its use, thus opening the market for trenchless home sewer replacement in America.