Melbourne retail water company, Yarra Valley Water, is taking positive action against this. Unlike many other Australian water authorities, Yarra Valley Water owns house connection branches from the inspection opening to the sewer pipeline.
Interflow has provided sewer rehabilitation services to Yarra Valley Water for over a decade and will be restoring approximately 400 house connection branches over the next year.
The need for restoration of house connection branches is identified from Yarra Valley Water’s records of clearing blockages. Most of these are 100 mm diameter vitrified clay pipes and can be located throughout Yarra Valley Water’s extensively covered area.
Restoration can involve either the dig-and-replace technique, or lining the pipes with Interflow’s epoxy cured-in-place DrainPlus liner. Typically, dig-and-replace is used on short and shallow lengths of up to two metres long. For longer lengths or for deep lines, installing the DrainPlus liner is more economical. Occasionally on long lines, patch liners will be installed where damage has been identified.
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Most of the house connection branches are 1.5 to 3.5 m deep, although depths of up to six metres have been encountered.
The Interflow DrainPlus liner was developed in association with the Company’s German partner Epros. As a very flexible felt liner is fundamental to the system in order to negotiate the tight bends found in house connection branches without excessive wrinkling, it is therefore suitable for a wider range of house connection branch configurations, leading to fewer disruptive dig-ups.
DrainPlus uses epoxy resin rather than the more common polyester resins. Although epoxy resin requires more attention during installation, it offers greater strength, greater adhesion to both the felt and the pipe being lined, and less shrinkage.
As epoxy resins do not contain styrene, no irritating fumes are emitted, an important factor when working close to houses.
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