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DOUBLE WALL TANKS
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A totally enclosed outer shell may be added resulting in a double wall construction. Both the inner and the outer tanks are vented separately and are pressure tested at 5 psi.
When enclosing a U/L Listed day tank, an additional emergency vent is added to the outer tank the same size as the inner tank. (The U/L Listing is "Secondary Containment Aboveground Tank for Flammable Liquids", File MH12807.)
Day Tanks with a capacity of 25 gallons and more have all threaded connections located on the tank top (except the overflow, drains, and the double wall vent). The inner tank drain is piped through the outer shell.
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RUPTURE BASINS
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All Day Tanks can be set in a Rupture Basin (open top dike), including a tank with double wall construction. See Option 385 for sizes.
A Double Wall or a Rupture Basin may be equipped with an optional Leak Detector that will shut down the pump motor, turn on an alarm light and provide contacts for a remote signal - Options 295 and 395.
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