The acronym ‘CRN’ stands for: Canadian Registration Number. This number is issued by a Canadian Jurisdiction and covers either pressure vessels, fittings, or pressure piping. It is a necessary authorization allowing these components to be in operation in Canada. The Canadian standard B51 defines it as having the following features:
Additional notes:
Position 1:
-For Fittings, this position has a zero placeholder.
-For Pressure Vessels, this position is blank.
-For Pressure Piping, both positions 1 & 2 have a “P”, such as PP2785.7
Position 2:
-For Fittings, this position holds the category of the fitting.
-For Pressure Vessels, it holds an assigned letter.
-For Power Piping, it holds a ‘P’, as noted above.
Position 8:
- Each Provincial Jurisdiction’s identification number/letter is listed below.
| Province | ID Number |
| British Columbia (BCSA) | 1 |
| Alberta (ABSA) | 2 |
| Saskatchewan | 3 |
| Manitoba | 4 |
| Ontario (TSSA) | 5 |
| Quebec | 6 |
| New Brunswick | 7 |
| Nova Scotia | 8 |
| Prince Edward Island | 9 |
| Newfoundland | 0 |
| Yukon Territory | Y |
| Northwest Territory | T |
| Nunavut | N |
| See Jurisdiction Contacts and Requirements for additional comments and notes. |
-For a Canada-wide registration, the user can place a ‘C’ here instead of listing all of the other jurisdictions. For example, for a fitting: 0A2548.2C.
-For certain categories of fittings, see comments entitled “Limited CRN Registration” relating to how to handle the fact that BCSA & Saskatchewan will not register these categories of fittings.