CSA B620 / B621 / B622:2020 — current TC 406 cargo-tank specification series
The current edition of the CSA highway tank series for bulk fuel transport is CSA B620:20 / B621:20 / B622:20 (all 2020 editions). The series is invoked by TDG Regulations (SOR/2001-286) Part 5, s. 5.14.
Confidence: Verified for the 2020 edition currency.
The current edition of the CSA highway tank series for bulk fuel transport is CSA B620:20 / B621:20 / B622:20 (all 2020 editions). The series is invoked by TDG Regulations (SOR/2001-286) Part 5, s. 5.14.
What each standard covers
| Standard | Scope |
|---|---|
| CSA B620 | Design, construction, certification, testing, repair, and marking of highway tanks for transporting dangerous goods |
| CSA B621 | Selection and use of highway tanks for transporting Class 3 (flammable liquids), Class 4, Class 5, Class 6, Class 8, and Class 9 |
| CSA B622 | Selection and use for Class 2 (gases) |
TC 406 specification
TC 406 is the most common low-pressure, non-circular highway tank specification for flammable liquids — gasoline and diesel sit here. CSA B620 Clause 5.7 defines TC 406: operating pressure 18–28 kPa, cannot be loaded by vacuum.
Periodic re-test schedule
CSA B620 Tables 7.2 and 7.3 define the periodic test schedule:
- Annual — external visual inspection
- Periodic — pressure test, leakage test, thickness test, internal visual inspection (intervals vary by service and tank type)
TDG training
A TDG training certificate for road transport is valid for 36 months (Transport Canada TDG Bulletin — TDG Training). See (unpublished reference) for the full TDG framework.
Sources & structured attribution
- source.document: CSA B620:20 Highway tanks and TC portable tanks for the transportation of dangerous goods; CSA B621:20 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; CSA B622:20 Selection and use of highway tanks, multi-unit tank car tanks, portable tanks, and other large containers for the transportation of dangerous goods, Class 2; Transport Canada TDG Bulletin TDG Training (tc.canada.ca)
- source.captured_date: 2026-05-16
- source.confidence: verified
- concept_category: cargo tank specification / bulk delivery compliance
- applies_to_services: bulk delivery, on-site refuelling, fuel-cube transport
- applies_to_audiences: dispatch, drivers, internal compliance
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