Fiberglass Storage Tank

The process by which we manufacture each fiberglass tank speaks volumes about our concern for quality, integrity, safety and longevity. Since the first non-corrosive tank was designed back in the 1960s, we have maintained the highest quality standards and have utilized promising technologies to engineer and build the world’s premier fiberglass tank.

Our Fiberglass Tank is made on steel molds from the Inside Out

We use steel mandrels (cylindrical steel molds) to build our tanks from the inside out. Steel molds provide us with a firm and consistent surface upon which we apply materials to make our tank. The rotation of the mandrel and the application of the materials are controlled by a computer, custom designed to manufacture underground tanks. As the mandrel rotates, resin, glass and specially treated silica are precisely metered onto the mandrel from above. Tank thickness is determined with an instrument that magnetically senses the metal mold surface through the fiberglass reinforced plastic laminate. This method accurately measures the thickness of the laminate using specific points all over the surface of the fiberglass tank wall and is more exact than the ultrasonic methods used by other manufacturers. The result is a closely controlled process and a very consistent tank wall composition and uniform integrity.

Different Process, Better Results

The inside-out approach to building the tank wall has some other advantages as well. The first layer of material forms the inside surface of the tank. Because of the smooth steel mold, the inside surface of the tank is frictionless and free of surface variations. The result is a well cured, smooth tank interior that will be exposed to the fuel in the tank. Since the inside surface is not exposed to air as it cures, the inside-out process eliminates air inhibited surface cure problems associated with other manufacturing methods. Alternative manufacturing processes depend upon the use of wax coatings/liners to cure the inner surface, inviting opportunities for risk.

Finally, by applying materials to the outside of the tank we can easily add additional thickness, reinforcing ribs, filament winding glass in tension, glass woven roving, glass mat, or any other materials in specific locations on the tank wall. Additional wall thickness is added exactly where it is needed. Ribs are applied in optimal locations, made in the most efficient shapes, and constructed of the most efficient reinforcing materials. In short, our fiberglass tank manufacturing process allows for a more versatile product.