Potable Water Reservoir Liners & Covers
http://www.fabtech.com.au/reservoir.html
We live on earth’s driest continent, where our most precious commodity has to be water – hard to come by and so easily lost. For those whose livelihood depends upon a continual supply of water it stands to reason that the collection, storage and ongoing quality of water has to be a priority.
Evaporation rates can range from between 2.5 metres to 4 metres per year from water storage, which can mean the loss of over two thirds of the volume of reservoir water. Combined with seepage rates and the prospect of drought, this loss can sometimes spell the difference between profit and loss for many city and rural based businesses.
More and more, local reservoir authorities, as well as industries such as viticulture, agriculture and aquaculture, are turning to proven geomembrane conversion techniques for improving water storage and protecting it from evaporation, contamination and algae growth.
Floating Covers
The Design Principles
Floating covers must function correctly at all operational water levels, hence their oscillating design. The key to achieving a well balanced, oscillating floating cover is to ensure that the tension of the cover is maintained at all times. Ballast lines bordered by floats must be configured correctly so that as the reservoir fills, the ballast lines the excess material and forms rainwater sumps. Rainwater which collects in these sumps is then pumped away.
Materials
As Australia ’s only QA/QC Accredited geomembrane converter (ISO9001:2000), Fabtech is committed to ensuring that all materials and workmanship reflect the stringent Quality Control conditions of such accreditation. Scrim reinforced polypropylene is Fabtech’s recommended material for floating covers and we are proud to be associated with Stevens Geomembranes (Mass, USA) as appointed Master Converters. Reinforced polypropylene now covers hundreds of thousands of square metres of Australia ’s water storages and its longevity and reliability is becoming more apparent as each year of installation passes.
Installation Techniques
The secret to the successful installation and longevity of a floating cover lies in the ratio between thermal welding techniques carried out in-house and those on site. In-house welders differ from on-site welders due to the surface on which geomembrane panels are welded.
In a controlled factory situation, the factory floor allows the sheets to be set up with the exact overlap to weld the seam. Factory fabricated seams are 60mm wide, as opposed to on-site seams which are only 40mm wide.
On-site seams by necessity have large overlaps on the underside of the cover, resulting in the risk of impregnation of foreign matter and bacteria. Result = increased maintenance costs and risk of water contamination.
Quality Control. Destructive testing procedures during factory fabrication result in any possible anomalies being dealt with on a more efficient and immediate basis.
It is therefore highly advisable to limit site welding, thereby guaranteeing the integrity of the cover. This is especially applicable with fabricating material for inflation, as any seam failure can be a precursor to major failure. Site welds are much more likely to be contaminated.
http://www.fabtech.com.au/reservoir.html
http://www.fabtech.com.au/reservoir.html
We live on earth’s driest continent, where our most precious commodity has to be water – hard to come by and so easily lost. For those whose livelihood depends upon a continual supply of water it stands to reason that the collection, storage and ongoing quality of water has to be a priority.
Evaporation rates can range from between 2.5 metres to 4 metres per year from water storage, which can mean the loss of over two thirds of the volume of reservoir water. Combined with seepage rates and the prospect of drought, this loss can sometimes spell the difference between profit and loss for many city and rural based businesses.
More and more, local reservoir authorities, as well as industries such as viticulture, agriculture and aquaculture, are turning to proven geomembrane conversion techniques for improving water storage and protecting it from evaporation, contamination and algae growth.
Floating Covers
The Design Principles
Floating covers must function correctly at all operational water levels, hence their oscillating design. The key to achieving a well balanced, oscillating floating cover is to ensure that the tension of the cover is maintained at all times. Ballast lines bordered by floats must be configured correctly so that as the reservoir fills, the ballast lines the excess material and forms rainwater sumps. Rainwater which collects in these sumps is then pumped away.
Materials
As Australia ’s only QA/QC Accredited geomembrane converter (ISO9001:2000), Fabtech is committed to ensuring that all materials and workmanship reflect the stringent Quality Control conditions of such accreditation. Scrim reinforced polypropylene is Fabtech’s recommended material for floating covers and we are proud to be associated with Stevens Geomembranes (Mass, USA) as appointed Master Converters. Reinforced polypropylene now covers hundreds of thousands of square metres of Australia ’s water storages and its longevity and reliability is becoming more apparent as each year of installation passes.
Installation Techniques
The secret to the successful installation and longevity of a floating cover lies in the ratio between thermal welding techniques carried out in-house and those on site. In-house welders differ from on-site welders due to the surface on which geomembrane panels are welded.
In a controlled factory situation, the factory floor allows the sheets to be set up with the exact overlap to weld the seam. Factory fabricated seams are 60mm wide, as opposed to on-site seams which are only 40mm wide.
On-site seams by necessity have large overlaps on the underside of the cover, resulting in the risk of impregnation of foreign matter and bacteria. Result = increased maintenance costs and risk of water contamination.
Quality Control. Destructive testing procedures during factory fabrication result in any possible anomalies being dealt with on a more efficient and immediate basis.
It is therefore highly advisable to limit site welding, thereby guaranteeing the integrity of the cover. This is especially applicable with fabricating material for inflation, as any seam failure can be a precursor to major failure. Site welds are much more likely to be contaminated.
http://www.fabtech.com.au/reservoir.html
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