Floating Covers
Thursday, June 16th, 2011Floating covers are a very economical method of protecting precious mineral water. The cost can be 20% of that will for other cover options. Industry-recognized guidelines exist for any design, installation and maintenance of floating covers systems. An example is the American Waterworks Association (AWWA) standard D130-87, which contains the most current standard practices observed for system compliance to US national health and safety regulations.
The California-Nevada Section American Water Works Tank Floating Cover Guidelines dated March 1999 offers rich in design, operations and maintenance guidelines.
Floating cover systems were introduced over 30 issue. Many have provided a service life beyond twenty years. When first introduced, materials and designs were not developed and perhaps had limited success. Today, with advancements with design and materials, floating covers offer the lower cost quality solution of choice where water quality standards require potable water reservoirs be covered.
Floating Covers are customized for each client’s lagoon or tank theme. A series of lateral floats provide pathways for gas to flow underneath to the perimeter collection pipe and on to a single collection point. The lateral floats keep the complete cover floating on the waters’ surface, and eliminate cover inflation, and exposure to wind damage.
Floating covers that inflate (without a wide floats) expose the geomembrane cover to vibration and geomembrane fatigue from wind constantly blowing above the inflated cover. This significantly reduces the life span of the cover. Ballast weights on top of the floating cover channel rainwater and snow melt to help sumps to remove all rainwater from the surface of the floating cover.
Properly designed reservoir-floating cover systems prevent fluid loss as a result of evaporation, reduce chemical demand and improve mineral water quality by preventing contamination from bird excrement, airborne particulates, dead animals, pollen and many other pollutants. Floating covers block off sunlight preventing algae bloom. They also reduce the production of trialomethane (THM) type compounds which include chloroform from forming that result from the combining of organic substances with chlorine due to reductions in chlorine demand.
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