The rehabilitation of the water pipelines for a government building in the Hong Kong Special Administrative Region presented the responsible parties with particular challenges: a very tight deadline of only four weeks, severe spatial constraints, and unpredictable freight times as an additional risk factor. With the egeplast egeLiner® in a custom-made dimension, installed using close-fit lining, the customer’s requirements could be met.
Special Challenges & Requirements
A total of two 160 m pipelines had to be rehabilitated. Primarily due to spatial constraints, the egeplast egeLiner® was chosen. One of the project’s special features was also the dimension of the required pipe. With a diameter of 145 mm, this does not correspond to any common standard. After modifications to the extrusion machines before production, this dimension was custom-produced for this project. The timely delivery of the pipes, despite a volatile freight market, seemed to overcome the biggest hurdle. However, a reorder became necessary due to a measurement error on the client’s side. The renewed, unavoidable freight times intensified the time pressure that characterized this project. As the main water supply to the government building had to be shut off during the entire construction phase, the originally set deadline of four weeks could not be exceeded.
Four weeks after construction began, the new pipeline was put into operation.
Successful Completion
Ultimately, good planning and communication among all project participants ensured that all logistical and construction challenges could be overcome on time – not least through an air freight delivery. After successful insertion and subsequent reversion, the new pipe was disinfected and finally inspected and approved. Exactly four weeks after construction began, the new water pipeline installed using close-fit lining was put into operation.
egeplast
egeLiner®
The pre-shaped egeLiner® is wound onto steel drums, tailored to the length of the section being renovated. This achieves a cross-sectional reduction of up to 40 percent, allowing long construction lengths to be delivered to the site.
Fundamentally, the folded egeLiner® pipe strives to equalize the stresses frozen in its wall and transform back into its round original shape — this is referred to as the reversion process, which causes the return to the original form (“memory effect”). This property makes the close-fit method highly efficient and ensures that, after successful Installation, the egeLiner® adheres closely to the inner wall of the old pipe and can be fully integrated into the existing pipeline network without restriction.
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