Storage tanks with a capacity of less than or equal to 275 gallons (1041 L) shall have a minimum thickness of shell and head plates of No. 10 manufacturer's standard Gage steel plate. Storage tanks of 60 gallon (227 L) capacity or less shall be similarly constructed but need not be thicker than No.14 manufacturer's standard Gage.
Exceptions:
1. Such vertical above-ground cylindrical tanks outside of buildings shall comply with Sections 1305.14.1 and 1305.14.5.
2. Such underground tanks need comply only with Section 1305.14.1.
3. Storage containers of 6 gallons (23 L) or less used with burners or oil-burning heaters need only be designed so as to withstand a hydrostatic pressure test of at least 5 psi (34 kPa) without permanent deformation, rupture, or leakage, and shall be approved. Such containers shall be installed with rigid metal fasteners for wall, floor, or stand-type installations, and shall be protected against mechanical damage. Portable storage containers of 6 gallons (23 L) or less may be filled by a pump mounted on a storage tank, provided that the pump is approved.
Exceptions:
1. Such vertical above-ground cylindrical tanks outside of buildings shall comply with Sections 1305.14.1 and 1305.14.5.
2. Such underground tanks need comply only with Section 1305.14.1.
3. Storage containers of 6 gallons (23 L) or less used with burners or oil-burning heaters need only be designed so as to withstand a hydrostatic pressure test of at least 5 psi (34 kPa) without permanent deformation, rupture, or leakage, and shall be approved. Such containers shall be installed with rigid metal fasteners for wall, floor, or stand-type installations, and shall be protected against mechanical damage. Portable storage containers of 6 gallons (23 L) or less may be filled by a pump mounted on a storage tank, provided that the pump is approved.