Additional notes:

Position 1:

-For Fittings, this position has a zero placeholder.

-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:

-See below for each Jurisdiction's identification number/letter.

-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.

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: