CAN/ULC 601:2025

Scope 1.1 This Standard sets forth minimum requirements for steel, non-pressure tanks that are used for the aboveground storage of flammable and combustible liquids compatible with the material of construction and with a specific gravity not greater than 1.0. Tanks storing liquids with a specific gravity greater than 1.0 are covered in 8.7. Tanks designed for higher static pressures are covered in 8.8. In addition to this Standard’s traditional safety requirements for aboveground steel tanks that primarily evaluate structural integrity and mitigate environmental hazards from loss of liquid containment under expected normal conditions; optional construction and/or performance requirements, and associated ratings intended to address more severe conditions associated with the effects of Climate Change are included in Annex .D. NOTE: These tanks may also be used for the storage of used oil. For tanks intended solely for the collection of used oil, refer to ULC 652, Standard for Tank Assemblies for the Collection, Storage and Removal of Used Oil. 1.2 This Standard covers tanks, which are fabricated, inspected and tested for leakage before shipment from the factory. 1.3 This Standard covers the construction of tanks for use in stationary installations. Tanks fabricated in accordance with this Standard are not intended for the transportation of flammable and combustible liquids nor are they intended to be transported while containing such liquids. NOTE: Relocation of tanks other than utility tanks is subject to the requirements of the authority having jurisdiction. 1.4 The installation of such tanks shall be in accordance with, but not limited to, the following documents: a) National Fire Code of Canada, Part 4; b) CSA B139, Installation Code for Oil Burning Equipment; c) CCME Environmental Code of Practice for Aboveground and Underground Storage Tank Systems Containing Petroleum and Allied Petroleum Products; and d) Regulations of the appropriate authority having jurisdiction. 1.5 Section 5 of this Standard covers the construction of single wall tanks. Section 6 covers the construction of tanks with secondary containment. 1.6 This Standard also covers aboveground steel, rectangular, non-pressure workbench tanks for the combined use as a working surface and storage of Class 3B oils having capacities up to and including 2500 L. 1.7 This Standard also covers aboveground steel, rectangular, non-pressure, combustible liquid-fired equipment base tanks. 1.8 This Standard also covers utility tanks and double bottom utility tanks designed to allow for relocation as required by their intended service. These tanks are for installation at locations such as farms, construction sites, demolition sites, exploration sites, forestry operations and similar locations. 1.9 Except for optional Climate Change Adaptation requirements in Annex D, these requirements do not cover special evaluations for resistance to, or use after, earthquakes, floods, high wind events, or other natural disasters. NOTE 1: Guidelines for the Maximum Structural Limitations for Vertical Tanks (A2) are included in Annex A (Informative), Explanatory Materials. NOTE 2: See the Note at the beginning of Annex D for further information on the terms “Adaptation” and “Mitigation”, as they pertain to Climate Change.