Figure 2. Insulation thickness vs cost.*

Figure 3. Heatec vertical asphalt storage tanks are insulated on top and bottom as well as sides.

Figure 4. Heatec tanks have 6-inches of Owens-Corning fiberglass insulation (2 layers of 3-inches).

Totaling up heat loss
Conductance is used to determine how much heat a tank loses and is the basis for the information in Figure 5. This figure compares the total amount of heat lost by tanks using insulation of several thicknesses for one year. The figure also shows the amount of fuel it would take to make up for the amount of heat lost. Carefully compare the differences in the amounts of fuel required.

Figure 5. Heat & fuel loss/year
Heat & fuel loss	Tank with 3-inch insulation	Tank with 4-inch insulation	Tank with 5-inch insulation	Tank with 6-inch insulation
Btu	361,971,031	273,598,535	219,998,325	183,869,071
Gallons No. 2 fuel	2,742	2,073	1,667	1,393
Ccf Natural gas	4,000	3,023	2,431	2,032
30,000 gallon storage tank. Maintain AC temperature at 300 degrees F. Annual hours of operation is 8760.

Heatec, Inc. 5200 Wilson Road Chattanooga, Tennessee 37410
www.heatec.com (423) 821-5200 (800) 235-5200 Fax(423) 821-7673