Current status: Closed
The Canadian Standards Association (CSA) has released the drafts of the update to safety standards CSA B620, CSA B621 and CSA B622 for a 60-day consultation period. The consultation is open from November 28, 2025, to January 27, 2026. Once the safety standards have been finalized and published, a notice will be issued specifying the coming into force date of the updated standards.
On this page
- Scope of the consultation
- How to participate
- Target audience
- Summary of proposed changes
- Related links
- Contact us
Scope of the consultation
Safety standard CSA B620 sets out the requirements for the design, manufacture, assembly, modification, inspection, testing and repair of highway and TC portable tanks. The standard also prescribes registration requirements by Transport Canada (TC) of facilities, training organizations, design engineers and design review agencies for conducting the activities within the scope of the standard.
Safety standard CSA B621 sets out the selection and use requirements for highway and TC portable tanks transporting dangerous goods of Class 3, 4, 5, 6.1, 8, and 9.
Safety standard CSA B622 sets out the selection and use requirements for highway and TC portable tanks transporting dangerous goods of Class 2.
How to participate
Please note that all CSA public review drafts are reviewed online and comments from the public to improve the standard can be posted online. The draft cannot be downloaded, but may be accessed from the CSA Group website via the following links:
CSA B620
B620, Highway tanks and TC portable tanks for the transportation of dangerous goods.
CSA B621
CSA B622
Target audience
All Canadians are invited to participate in the online consultations. Those with a particular interest may include:
- Industry associations representing members who transport dangerous goods in highway tanks or TC portable tanks.
- Facilities and other entities registered with Transport Canada under CSA B620.
- Dangerous goods carriers and haulers.
Summary of proposed changes
The draft safety standards build on CSA B620:20, CSA B621:20 and CSA B622:20 by incorporating the following notable technical changes:
CSA B620
- Expanded and clarified definitions (Clause 3.2);
- Updated requirements for lightweight appurtenances, including pad size, weld requirements (Clause 5.1.4);
- Introduced clearer requirements for marking inlets/outlets with “liquid” “vapour” (Clause 5.2.2.9);
- Updated gauge calibration and digital gauge selection requirements (Clause 7.1.4);
- Clarified requirements for reclosing pressure relief device testing or replacement (Clause 7.2.7.6);
- Improved requirements for tests and inspections following repairs (Clause 7.5.8); and
- Established qualification requirements for training instructors, including trainee supervision (Clauses 8.1.7.5 & 8.1.7.6).
CSA B621
- Allowed the recognition of compatibility information from the tank or composite material manufacturer for FRP tanks (Clause 4.3);
- Clarified requirements for tests and inspections of tanks involved in an accident (Clause 7.1 c));
- Strengthened requirements for automatic engine air intake shut-off devices, including installation, maintenance, and testing (Clause 7.1 j));
- Added methanol (UN1230) to the dangerous goods selection and use table for easier identification (Table 3); and
- Introduced requirements to reinstall parts removed during loading/unloading before transport (Clauses 7.4 d) and 7.7 c)).
CSA B622
- Removed outdated references to ton containers (Clause 4);
- Clarified requirements for tests and inspections of tanks involved in an accident (Clause 5.1 c));
- Strengthened requirements for automatic engine air intake shut-off devices, including installation, maintenance, and testing (Clause 5.1 i));
- Introduced requirements to reinstall parts removed during loading/unloading before transport (Clauses 5.4 f) and 5.7 c));
- Improved visibility of monthly test of off-truck emergency shutdown systems (Clause 5.5.3 and Annex A); and
- Clarified requirements for parts in contact with ammonia liquid or vapour (Clause 6.3).
Related links
- B620, Highway tanks and TC portable tanks for the transportation of dangerous goods.
- B621, Selection and use of highway tanks, TC portable tanks, and other large containers for the transportation of dangerous goods, Classes 3, 4, 5, 6.1, 8, and 9
- B622, Selection and use of highway tanks, TC portable tanks, and ton containers for the transportation of dangerous goods, Class 2
Contact us
For any questions, please use the contact details below:
Vaishnavi Somasundaram
Project Manager, Worker and Public Safety
CSA Group
178 Rexdale Blvd.
Toronto, ON
M9W 1R3
Email: vaishnavi.somasundaram@csagroup.org