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Codes recognize the use of UL 142 listed tanks
The NFPA 30 Flammable and Combustible Liquids Code requires atmospheric tanks to be designed and constructed
in accordance with one of several recognized engineering standards, one of which is the UL 142, Standard for Safety
for Steel Aboveground Tanks for Flammable and Combustible Liquids. The International Fire Code in turn requires tanks
to be designed, constructed and installed in accordance with NFPA 30.
Types of tanks covered by UL 142
UL 142 includes requirements that cover steel primary, secondary and diked type atmospheric storage tanks intended for
noncorrosive, stable flammable and combustible liquids that have a specific gravity not exceeding 1.0 in aboveground applications.
UL 142 includes requirements for tanks fabricated in a combination of various shapes (cylindrical, rectangular or round) and
orientations (horizontal, vertical) with or without multiple compartments.UL 142 covers shop fabricated tanks only, and does not
cover portable tanks intended for transporting flammable or combustible liquids (such as shipping containers), or mobile use applications
(such as mounted on a trailer).
UL 142 requirements
UL 142 includes requirements that manufacturers use to design and fabricate aboveground steel tanks, and that certification organizations
such as UL use to investigate and List (certify) these tanks. The standard includes a comprehensive set of requirements in the following areas:
Construction requirements – These include specification for the tank materials, joints, connections, fittings, manholes (if
provided), fill, drain and gauge openings, and painting. They also include specific construction requirements for the primary and secondary containment means, supports, etc.
Performance tests – These requirements include tank leakage, hydrostatic strength, top loading, buoyancy, hydrostatic load, tank support load, and lift lug tests that are designed to verify that the tank design does not exhibit signs of leakage and/or structural damage as a result of these tests.
Markings and production line test – UL 142 requires tanks to include specific markings discussed below. In addition, 100% of production of each Listed primary and secondary containment tank must be tested for leakage by the manufacturer.
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