Atmospheric Storage Tanks are often used to:

q As a cost-effective means of storing RO product water, or permeate, for subsequent downstream use

q As a buffer between two processes that produce or demand water at different rates (Level switches may be added to synchronize the timing of water production based on the demand of downstream processes)

Our polyethylene water and chemical storage tanks out-perform the more expensive, traditional water storage systems for a variety of reasons. Because our tanks are rotationally molded, they are seamless and water tight. They will never rust or corrode and are nearly indestructible. Made of 100% virgin resin listed by the FDA for potable water storage, our polyethylene water tanks contain no colorants. All are efficiently lightweight for easy transportation and installation.

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Application Note: Atmospheric Storage as an Integral Water Train Component

They are just holding tanks, right? Yes, but Crane Environmental often integrates the atmospheric storage into the total water system with level controls and other control logic that allows the water train to operate at optimum efficiency for the end user. Systems that integrate storage come ready to install and will operate as designed at startup. We calculate sizing based on equipment demand and maintenance cycles.

Storage tanks come in an endless variety of sizes and shapes to fit any application. Be sure to consult your customer service representative or application engineer about the details of your application, especially space constraints, to make sure that you have the right tank for the right job.

In the above example, an atmospheric storage tank acts to accumulate demand for water, reducing the number of operating cycles of the Reverse Osmosis (RO) unit. Ball floats in the storage tank act to signal the RO to start and stop. The repressurization system (above right) also stores a small amount of water in a bladder tank that serves a similar purpose for the repressurization pump, by reducing the number of operating cycles. The end result is that demand for water is decoupled from the system operating cycles wich means that water is available when needed without unduly burdening the equipment.

In the above example, atmospheric storage is used in a carwash system to balance water demand and water flow of both RO produce water (permeate) and RO reject water (concentrate). The stored permeate is used to rinse cars at the end of a wash cycle, providing a "Spot-Free" wash. The permeate is nearly free of all dissolved solids that remain on a car that is washed with average tap water. The concentrate, in the above application, is used in the "Pre Soak" cycle of the carwash to reduce demand for fresh water by the overall carwash. Carwash customers are happy with their spotless cars and the carwash owner is happy with a lower water bill.