Question: Does a double-wall tank need secondary containment?

Answer: According to this EPA letter, a double-wall tank will provide secondary containment when certain equipment is installed. Please see this EPA Memo dated 1992.

 Question: How do Fireguard & Flameshield Tanks differ?

Answer: For a good comparison of these tanks, please read the article entitled, "SwRI Tests UL142 Double-Wall AST" published in Tank Talk, in May 1999. 

NOTE: you may need to scroll down the web page to see the article.

Question: 
What is the R-Value of the insulation used in Fireguard Tanks?

Answer: In an experiment conducted to find the insulating value of Fireguard concrete insulation, the thermal resistance of the insulation was found to be 0.7 (hr-°F-sq.ft.)/(Btu-in.). This is compared to the thermal resistance of fiberglass insulation that is used in your house of 4 (hr-°F-sq.ft.)/(Btu-in.).

Thermal resistance is defined as "a quantity expressing the ability of a substance to prevent a heat transfer; equal to the temperature difference across the surfaces of the body divided by the rate of heat transfer."

This means that 3 inches of Fireguard insulation will have an R-value of 0.7 x 3 or 2.1 (hr-°F-sq. ft.)/(Btu), the R-value of 3 inches of fiberglass insulation is 12 (hr-°F-sq. ft.)/(Btu). The R-value of mineral wool insulation is nearly the same as fiberglass.

Question: Does a double-wall tank need secondary containment?

Answer: According to this EPA letter, a double-wall tank will provide secondary containment when certain equipment is installed. Please see this EPA Memo dated 1992.

 Question: How do Fireguard & Flameshield Tanks differ?

Answer: For a good comparison of these tanks, please read the article entitled, "SwRI Tests UL142 Double-Wall AST" published in Tank Talk, in May 1999. 

NOTE: you may need to scroll down the web page to see the article.

Question: 
What is the R-Value of the insulation used in Fireguard Tanks?

Answer: In an experiment conducted to find the insulating value of Fireguard concrete insulation, the thermal resistance of the insulation was found to be 0.7 (hr-°F-sq.ft.)/(Btu-in.). This is compared to the thermal resistance of fiberglass insulation that is used in your house of 4 (hr-°F-sq.ft.)/(Btu-in.).

Thermal resistance is defined as "a quantity expressing the ability of a substance to prevent a heat transfer; equal to the temperature difference across the surfaces of the body divided by the rate of heat transfer."

This means that 3 inches of Fireguard insulation will have an R-value of 0.7 x 3 or 2.1 (hr-°F-sq. ft.)/(Btu), the R-value of 3 inches of fiberglass insulation is 12 (hr-°F-sq. ft.)/(Btu). The R-value of mineral wool insulation is nearly the same as fiberglass.