UL 142 is a standard developed by Underwriters Laboratories (UL) that outlines the requirements for the design, construction, and performance of aboveground steel tanks used for the storage of flammable and combustible liquids. This standard ensures that tanks are built to be safe, durable, and resistant to leaks and environmental hazards. Compliance with UL 142 is essential for manufacturers and users to ensure safety and regulatory adherence in the storage of hazardous materials.