The slip lining method is similar to the pipe bursting process, since both procedures include the insertion of a replacement PE pipe within a deteriorated existing pipe. However, the slip lining procedure has the advantage of utilizing the existing host pipe, without the need of bursting the existing pipe and/or expanding the cavity. Thus, the potential complications of the latter process are avoided, with correspondingly reduced sources of short or long-term failure. Nonetheless, it is critical that the contractor ensure that the replacement pipe meets the specification before, during, and after placement. Adhering to the quality control and quality assurance plans during the manufacturing and shipping to the site along with proper unloading of the pipe reduces risk of pipe failure. It is recommended that the pipe fusion is performed by certified and well trained workers under appropriate supervision to reduce the risk of pipe failure later when repair is difficult and costly. For pressure applications, the PE pipe should be inspected and pressure tested before and after placement.