Can You use Trenchless Technology on a Bellied Line?

Trenchless technology cannot be used on a bellied line because the sleeve will simply follow the existing pipe and end up with a belly. The line has to be dug up at the belly and repaired with a new section of pipe to correct the belly. There are other techniques for running a new line alongside the existing sewer line with directional boring or with a pneumatic gopher. Both of these technologies, however, might encounter problems with rocks or underground cables if they are in the path of the bore.