# 2004 Milan
Polyethylene pipeline systems have now been used with considerable success by the UK Water Industry for over twenty years. Most, if not all, water companies now regard polyethylene as the default material choice for all normal distribution system applications. i.e. up to 300mm nominal diameter. However, for larger diameter pipelines, polyethylene has not been nearly as successful in gaining market share. This paper attempts to explore some of the reasons why this is the case.