Papers # 2016 Berlin
It has long been the case that plastic pipes have been subject of folding operations in a factory and then supplied to site for use in pipeline renovation applications. The same cannot be said for pipes subject to diameter reduction as they have, as a principle, relied on being diameter reduced at site in a forming process after which they are held in longitudinal tension to prevent recovery of the pipe to its original size. There are good reasons why both folded pipe and diameter reduced pipe lining systems coexist in the market and in this paper we will present a recent innovation by Subterra that allows pipes to be diameter reduced in a factory environment and then held in a reduced diameter without application of tensile loads. At a convenient time they are supplied from stock to construction sites and inserted without the need to use diameter reduction tools on site or react substantial loads in the construction environment. The paper will provide a broad overview of the principle, the change it offers to asset owners in how they approach replacement of old metallic infrastructure and experiences gained in practice from deployment of the new technology.