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Trenchless or pipe busrting is a technique for replacements of existing pipes.
The existing pipes, once they burst, become the guide path for the new pipe being installed. The technique burst the old pipe into and going so displaces the fragmented old pipe into surrounding soil. This creates a hole, roughly the same dimension as the original. When a larger diameter pipe is to be installed a larger expanding cone is used to increase the size of the hole. Once done, the new pipe is pushed or pulled into position. A variation of this method is calles pipe slitting, which breaks the pipe by longitudinal slitting.
High- Density Polyurethane pipe
With a life expectancy of 200 years or more, this pipe is far superior to traditional pipe. HDPE is very flexible, corrosion-resistant, and leaktight; do to the use of the fusion method, the joint is stronger than any other part of the pipe.
Trenchless sewer pipe relining actually increases flow capacity because the trenchless sewer pipe is now smoother than the old clay, cast iron, or concrete pipe. Calcification deposits won't adhere to the epoxy-lined walls. Additionally, above the ground, there are no major piles of excavated dirt nor busted hardscape to be repaired