What is a Canadian Registration Number (CRN)?

A Canadian Registration Number (CRN) confirms that the design of a pressure vessel or fitting has been accepted and registered for use in that province or territory.

CRN numbers date back to the 1939 edition of CSA B51 and have evolved over time with the most recent edition of CSA B51 in 2019. The CRN numbering system has been harmonized to recognize pressure equipment across Canada and to facilitate jurisdictional recognition while maintaining safety for all Canadians.

The CRN is for any boiler, pressure vessel or fitting that operates at 15 PSI or higher pressure. If your pressure retaining fitting or vessel operates at a pressure greater than 15 PSI, you may require a Canadian Registration Number (CRN) to legally install and operate your product in Canada. CRN numbers are not required in the United States.

The numbering system can be confusing. The first registering province or territory is indicated by the first digit after the decimal. For example, a design registered first in Ontario and then in British Columbia might be issued the number 0H6245.51. If the letter C follows the designation of the province of first registration, it means the design is subsequently registered across Canada. For example: 0E3621.2C shows that the design was first registered in Alberta and then across Canada.

Additional Resources:

https://www.linkedin.com/pulse/crn-harmonization-reconciliation-history-public-cameron-a/?trk=articles_directory

https://www.pveng.com/home/canadian-registration-number-crn/#:~:text=CRN%20registration%20is%20required%20for,or%20fittings%20can%20be%20produced.