Van Keppel

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2024 ASTEC Mobile Screens Heatec Thermo-Guard® Storage Tanks TAV-25

THERMO-GUARD® is the trademark we use to distinguish our current line of vertical asphalt storage tanks. Astec Thermo-Guard tanks have features that cut heat loss to an absolute minimum—at a reasonable cost. The tanks are usually built to order and can be configured to suit your exact needs. Many options are available, including the components for mixing.

Vertical tanks minimize oxidation of the asphalt because the surface area of the asphalt in contact with air inside the tank is much smaller than in horizontal tanks. This is especially important for PMAC (polymer-modified asphalt cement), which oxidizes faster because it is maintained at higher temperatures.

Another advantage of a vertical tank is the minimal ground area it occupies. Vertical tanks have smaller footprints than horizontal tanks. You can put four vertical tanks in the ground space occupied by a single horizontal tank.

Features may include:

• They may look like ordinary tanks on the surface but they have key differences that make them less expensive to maintain and they produce better quality product. The design virtually eliminates the need for expensive and time consuming tank cleaning. It also has better agitation and heat distribution than an ordinary tank. They are especially beneficial for storing modified asphalts.

• The amount of insulation used on Astec vertical tanks sets them apart from the competition. More insulation means less heat loss. We fully insulate all tank surfaces. The top bulkhead has a double-wall that encloses 6 inches of fiberglass insulation. Outer surfaces of the side walls also have 6 inches of fiberglass insulation. Unlike other manufacturers, we insulate the tank bottom as a standard feature. Its inner surface has 3-inch foam glass insulation with a metal cover to protect the insulation. This feature alone results in a significant reduction in heat loss.

• Thermo-Guard tanks provide a better mixing, heating and storage solution for PMAC (Polymer Modified Asphalt Cement) than competitive tanks.

• To achieve proper blending of PMAC, the virgin asphalt is heated to temperatures higher than normal. So, insulation is more important than ever. And design of the mixing system is just as important. Our mixing system keeps the polymers in suspension to prevent them from separating from the virgin asphalt.

• The number, size, pitch, location and rotational speed of the impeller blades are key factors in maintaining mixture consistency. Moreover, the baffle and piping are carefully arranged to keep material from hugging the tank wall and to minimize stagnation zones.