Polyethylene is one of the most commonly used materials globally in the rehabilitation of existing pipelines (Water, Gas and Wastewater). Methods vary considerably, typically in water pressure mains, maximisation of the bore in order to maintain existing flows is the objective, so close and tight fit (pipe in pipe) liner solutions are more typical.
The other factor is the 'condition assessment' of the existing main to determine it's ability to provide a suitable host pipe for the PE liner. In Hong Kong, there are very few 'semi-structural liners' installed. It's more typical that the host pipe is used only to provide a path for the new PE liner, the PE liner pipe is fully structural in its own right.
Rehabilitation of Ductile Iron and Steel pipelines that have reached the end of their operational life, is commonplace around the world. Approximately 50% of the Hong Kong Water Supplies Department's 5700km drinking and flushing water supply network was either rehabilitated or replaced between Years 2000 to 2015, the majority was repaired or replaced using Polyethylene pipes.
Rehabilitation using PE typically involves the insertion of a custom size (non-standard pipe OD) PE pipe inside an existing host pipe, from point to point without excavation in-between. There are many techniques and methods available to perform this kind of rehabilitation in sizes from DN50 to DN2000 and larger
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