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Canadian Registration Number (CRN)

A Canadian Registration Number (CRN) is a number issued by each province or territory of Canada to the design of a pressure vessel or fitting. The CRN identifies the design has been accepted and registered for use in that province or territory. The CRN is stamped on any pressure vessel or fitting built to a registered design.

A CRN for a pressure vessel or fitting is defined by CSA B51 Clause 4.3 as:


For a pressure vessel:

  • consisting of a letter, four digits, and a decimal point followed by up to ten digits and three letters
  • the first letter and four digits are part of a sequential numbering system used by the issuing province or territory
For a fitting:
  • consisting of a zero, the category letter, four digits, and a decimal point followed by up to ten digits and three letters
  • the category letters are defined as follows

    A – pipe fittings
    B – all flanges
    C – all line valves
    D – all types of expansion joints, flexible connections and hose assemblies
    E – strainers, filters, separators and steam traps
    F – measuring devices
    G – certified capacity-rated pressure relief devices
    H – pressure-retaining components that do not fall
    into any of the above categories – fabricated strainers

  • the four digits before the decimal are part of a sequential numbering system used by the issuing province or territory
For pressure vessels and fittings:
  • the first digit or letter to the right of the decimal point indicates the province that issued the particular number
  • the following identifications are used in accordance with the code:

    1 - British Columbia 7 - New Brunswick
    2 - Alberta 8 - Nova Scotia
    3 - Saskatchewan 9 - Prince Edward Island
    4 - Manitoba 0 (zero) - Newfoundland
    5 - Ontario T - Northwest Territories
    6 - Quebec Y - Yukon Territory
      N - Nunavut

  • the letter C may follow the designation of first registration if a design is registered in all jurisdictions. No jurisdiction issues the letter C; it is a convenience for stamping once the manufacturer has received all the registrations.






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