Speaks pretty much for itself. Where a pipeline has suffered minor collapse or has become misshapen due to usually external forces/ground movement, reshaping the pipe can improve flow and restore capacity to the pipe where no visible defect is apparent such as cracks. Re-rounding can be achieved by utilising various means including inflatable packers which are positioned at the deformation point and inflated to push the pipe back into it correct shape or by using a winched re-rounding bomb.
In this instance a winch cable is passed through the pipe and the bomb (often a solid metal ball or cylinder which has an external diameter equal to that of the internal diameter required of the pipe) is attached to the cable.
The bomb is then pulled through the pipe so that as it passes through the restricted/deformed section of the pipe it reshapes the pipe to the correct diameter. This operation can be used as a stand-alone repair option or as a preliminary action prior to further addition of another localised repair technique.