HypaFlex™ CSPE Floating Covers in Municipal Water Supply

LOCATION: Australia PRODUCT: HypaFlex™ CSPE   PROJECT PARTNERS: Supplier - Layfield Geosynthetics

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ow do you build a large volume potable water storage in the shortest possible time when the ground is unsuitable for an earth bank storage? This was the dilemma faced by a water utility in Australia. The answer came in the form of a unique modular pre-cast concrete panel tank, erected and post-tensioned on site, with an Enviro Liner 6040 secondary geomembrane liner, HypaFlex™ Chlorosulfonated Polyethylene (CSPE) primary liner and a geosynthetic floating cover of the same material.
The tank construction was similar to regular tilt panel construction, and it could be erected, lined & covered and in service within weeks, while regular earth bank storage construction typically takes months and sometimes years to complete. During the project assessment stage, the water utility determined the construction time of the tank was 75% less than alternative solutions and 30% less expensive than the next alternative.
The 1.14mm (45mil) HypaFlex™ CSPE primary liner and floating cover materials were specified for this project due to their proven durability, excellent weathering resistance, excellent chemical resistance to chlorine and lifelong flexibility properties. This is an important performance function of the geomembrane allowing the material to be folded and flexed repeatedly throughout its operational life. The 1.0mm thick (40mil) Enviro Liner 6040 secondary liner also provided long-term durability, resistance to chlorine and value for money. The water utility has significant experience with these materials, using CSPE in liners and floating covers since 1986. They were also early adopters of Enviro Liner 6000 when it was released into the Australian market in 2007.