Steel Tank Institute / Steel Plate Fabricators AssociationUL Standard for Steel Aboveground Tanks for Flammable and Combustible LiquidsUL Standard for Protected Aboveground Tanks for Flammable and Combustible Liquids Southwest Research Institute Get a project quote today! We’ll put together a customized quote about your project and work with you to get started on your project. Let’s build something together! Get in touch today!