Transport Canada has informed CAAR, the new editions of the B620:20 and B622:22 standards are now officially published and adopted in the TDG Regulations. As a result, CAAR members no longer require the equivalency certificate SH 11960.

In the 2020 edition of the CSA B620 and B622 standards, the pressure test frequency has changed from 3 years to 5 years for specific tanks used to transport anhydrous ammonia, such as nurse and applicator tanks.

The specific tanks must meet the following conditions:

  • the tank has been post-weld heat-treated and has a maximum allowable working pressure (MAWP) of 1830 kPa (265 psi), or

  • the tank has been post-weld heat-treated and has a maximum allowable working pressure (MAWP) of 1725 kPa (250 psi), and it can be demonstrated that the tank has been designed for anhydrous ammonia (NH3) use.


Learn more about all of the updated standards:
CSA B620:20  |  CSA B621:20  |  CSA B622:20

If you have any questions, please contact the CAAR office at This email address is being protected from spambots. You need JavaScript enabled to view it. or (204) 989-9300.