Summary of Topics

This new Sixth Edition of CAN/ULC 601 includes the following changes in requirements:

– Bulkhead Construction for Compartment Tanks 5.3.1; – Miscellaneous Corrections 13.1, 14.2, and Figure 5.3 – Integrally Contained Tank Markings 13.4; – Specific Gravity > 1.0 and Static Head Tanks 1.1, 3.17, Section 8.7, Figure 8.1, Figure 8.2, Section 8.8, Section 19, 19.1, and Section 20; – Figure 5.3 Dimension Tolerances; – Double Wall Tank Terminology Change: 3.6, 3.8, 3.12, 3.14, 3.15, 3.16, Section 6 title, 6.2.3.1, 6.2.3.2, 6.2.3.3, 6.2.3.4, 6.2.4.2, 6.2.5, 6.2.5.1, 6.2.6, 6.2.6.1, 6.2.6.2, 6.2.6.3, 6.2.6.4, 6.2.6.5, Section 7 title,7.1.1, 7.2.2, 7.3, 7.4.1, 7.4.3, 7.5.1, 16.2, Section 17 title, 17.1, and 18.1; – Generator-Base Tank Terminology Change: 1.7, 3.3, 5.1.4, 5.5.2.2, 9.2.2, 9.2.3, 9.6.1, 9.6.2, 9.7.2, 13.4, and 14.1; – Marking Section Revisions: 1.6, 3.18, 3.20, 13.1, 13.4, 14.1, 15.2, 16.2, 17.1, 18.1, 19.1, 20.1, and Section 21; – Revise Section 4.6; – Fixing Rectangular Tank Venting and Misc. Problems: 5.5.1.4; – Fixing Workbench Tank Venting and Misc. Problems: 5.5.1.1 and 5.7; – Fixing Generator Base Tank Venting and Misc. Problems: 5.8; – Fixing Utility Tank Venting and Misc. Problems: 5.6.1.3.1 – Fixing Integrally Contained Tank Venting and Misc. Problems: 4.6 – Fixing Interstitial Venting and Misc Problems: 7.2 – Table 7.1 Correction and Title Update – Delete Untested Vent Designs

1 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 7. Tanks designed for higher static pressures are covered in 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:

1. a) National Fire Code of Canada, Part 4;

2. b) CSA B139, Installation Code for Oil Burning Equipment;

3. c) CCME Environmental Code of Practice for Aboveground and Underground Storage Tank Systems Containing Petroleum and Allied Petroleum Products; and

4. d) Regulations of the appropriate authority having jurisdiction.