Floating Cover Project Evaluation Sheet


GeoCHEM strives to make certain that your floating cover performance, cost, deadline and lifespan objectives are met.  We start by helping you design the cover and select the right materials. We'll meet your delivery deadlines with the greatest automated plant capacity among cover fabricators. And we either install your cover for you, or provide on-site technical assistance for your crew.


Floating covers are flexible thermoplastic membranes securely fastened to a perimeter concrete wall or buried in an anchor trench. In use, they float like a boat on water, rising and falling with the changing level of the liquid beneath. These flexible covers are less expensive and easier to install than containment systems constructed of concrete, steel or other materials. Their inherent flexibility withstands ground movement and provides needed durability.

Floating covers are an effective, economical solution to a number of water and waste containment problems. Potable water storage, chemical containment, and municipal and industrial waste disposal are three areas where floating covers have been proven to be particularly useful.

POTABLE WATER.  Floating covers prevent losses through evaporation. Odor and taste free, they help protect potable water supplies by minimizing reservoir contamination from dust and dirt, leaves, insects, animals, etc. Literally tons of such debris can collect at the bottom of uncovered reservoirs. This can actually trap chlorine, and make it difficult, if not impossible, to maintain a sufficient amount in the water itself.

Floating covers also exclude sunlight. This reduces problems with algae growth and chlorine depletion.

The American Water Works Association and many states recommend covering all reservoirs containing potable water that will be delivered directly to customers. Some states even require it.

CHEMICAL CONTAINMENT. Floating covers help control fumes and odors from chemicals held in storage tanks or lagoons. It is necessary for the project engineer to identify the complete composition of the chemicals being contained in order to properly determine which floating cover material should be specified.

MUNICIPAL AND INDUSTRIAL WASTES. Many of the same advantages floating covers offer in chemical containment applications apply here as well. Floating covers control fumes and odors; trap and divert methane gas; prevent overflow and site contamination during rainy weather; plus, promote anaerobic action for faster waste decomposition.


GeoCHEM floating covers are fabricated from a complete line of roll goods from recognized and dependable suppliers. Each type offers distinct performance benefits in particular situations. Our design experts will help you select the right material for your application.

REINFORCED POLYPROPYLENE covers are EPA/NSF approved for potable water use, and thus are commonly specified for potable water reservoirs as well as industrial applications. Reinforced with a high-strength polyester scrim, these covers offer excellent tear resistance, tensile strength and dimensional stability. They withstand the effects of sunlight and ozone over a considerable length of time. Polypropylene covers can last 20 years or more when properly maintained.

ELVALOY* ALLOY, a supported elasticized polyolefin, resists a broad range of chemicals and temperatures. It is available with a variety of polyester reinforcing fabrics that provide exceptional tensile strength and puncture resistance. The reinforcing fabric strengthens the two plies of thermoplastic sheeting to which it is adhered. Elvaloy is a high molecular weight non-migrating polymer that resist a wide variety of chemicals and withstands harsh environmental conditions. Elvaloy alloy covers can also last 20 years or more if properly maintained.

Black is the standard color of all our floating covers. However, white, green, blue and brown covers are also available to meet particular aesthetic and functional requirements. Black covers only warm the top few inches of a reservoir due to the natural stratification of liquids, so reservoir contents remain at ambient temperatures during summer months.

PERIPHERAL EQUIPMENT AND MATERIALS.  As a turnkey supplier of floating cover systems, we can supply or source most of the peripheral equipment and materials you'll need to install, utilize and maintain your floating cover. This includes floatation materials, anchoring systems hardware, air compressors and adhesive solvents. We can also suggest sources for scavenging pumps. Ask your GeoCHEM representative for more information about peripheral equipment and materials recommended for your installation.


GeoCHEM does more than just supply you with a cover. We can assist you with all the details, from cover design through installation, to meet your particular performance specifications.

We'll help you decide what type of material to use. Design the fabricated membrane to minimize field seaming and assure trouble-free installation. Determine whether you'll need to incorporate floatation material under the cover. Design a rainwater drainage/collection system. Calculate what size scavenging pumps are needed to remove rain and cleaning water from the surface of the cover. And identify the location of any access or inspection hatches.


After fabricating your custom cover, we'll help you with the installation, because proper installation is critical to its performance. We can arrange to have the cover installed for you. Or, if you choose to do the job yourself, we'll supply the technical support you need to get the job done right.

The GeoCHEM "Impermeable Liner and Floating Cover Installation Guide" provides general instructions for installing floating covers. It explains what equipment is needed, how to receive and store the cover, site preparation, general seam bonding instructions, and offers tips on anchoring the cover.

Floating Cover Project Evaluation Sheet


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