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Steel tanks shall conform to UL 70. Any damage to the bituminous coating shall be repaired by recoating. The gage of the steel shall be in accordance with Table 504.3.
TANK CAPACITY
TANK DESIGN AND
CAPACITY
MINIMUM
GAGE
THICKNESS
MINIMUM
DIAMETER
Vertical cylindrical
500 to 1,000 gallonsBottom and
sidewalls
12 gageNone
Cover12 gage
Baffles12 gage
1,001 to 1,250 gallonsComplete
tank
10 gageNone
1,251 to 1,500 gallonsComplete
tank
7 gageNone
Horizontal cylindrical
500 to 1,000 gallonsComplete
tank
12 gage54-inch diameter
1,001 to 1,500 gallonsComplete
tank
12 gage64-inch diameter
1,501 to 2,500 gallonsComplete
tank
10 gage76-inch diameter
2,501 to 9,000 gallonsComplete
tank
7 gage76-inch diameter
9,001 to 12,000
gallons
Complete
tank
1/4-inch
plate
None
Over 12,000 gallonsComplete
tank
5/16 inchNone
For SI: 1 inch = 25.4 mm, 1 gallon = 3.785 L.

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