UFC 3-460-03
21 JANUARY 2003
7.2.1.4. Cone Roof Tank with Floating Aluminum Honeycomb Pan. This tank is designed for
aboveground storage and reduces the effects of weather. The aluminum honeycomb pan lays
directly on the fuel surface, eliminating any trapped vapor above the fuel surface. Two rim seals
prevent vapors from escaping into the atmosphere. This is the tank required by Air Force standard
designs.
7.2.1.5. Horizontal Cylindrical. New design criteria limits the tank size to a maximum of 151,416
liters (40,000 gallons). It is equipped with direct-reading gauges and provides for manual gauging
to determine the tank's fuel level. Follow NFPA 30, NFPA 30A, and UL 142, Steel Aboveground
Tanks for Flammable and Combustible Liquids. Figure 7.11 shows a horizontal cylindrical tank.
Figure 7.11. Horizontal Cylindrical Tank.
7.2.1.6. Self-Diking or Vaulted Tanks. Removing underground storage tanks is creating a new
market in aboveground tanks that do not need dikes, can be located next to buildings, and are
more attractive than standard tanks. These tanks range in size from 946 to 45,424 liters (250 to
12,000 gallons). Tanks used in an application requiring secondary containment must be UL-listed
secondary containment tanks, with steel liner and steel outer tanks that can provide interstitial
containment that is pressure-testable and -verifiable. If the application requires a fire-rated tank,
the two-hour fire rating must exceed all NFPA 30 and NFPA 30A requirements for fire-resistant
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