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The Canadian Registration Number (CRN)

Canadian Registration Numbers are unique numbers issued by engineering authorities across all Provinces and Territories in Canada, to identify when pressure vessels and fittings meet a level of design and construction that has been approved and registered for use in its applicable jurisdiction. In order to legally install and operate a wide variety of pressure retaining systems in Canada, a CRN may be required on the parts being used. Parker Canada wants to ensure your purchase upholds a high standard of safety and quality.

The Canadian Registration Number (CRN) is a number issued by each province or territory in Canada by an authorized safety authority for any boiler, pressure vessel or fitting that operates at a pressure greater than 15 psig (1 barg). If your pressure retaining product or system operates at a pressure greater than 15 psig you may require a Canadian Registration Number (CRN) to legally install and operate your product in Canada.

The CRN identifies that the design has been accepted and registered for use in that province or territory. 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.

  • 1 = British Columbia

  • 3 = Saskatchewan

  • 4 = Manitoba

  • 5 = Ontario

  • 6 = Quebec

  • 7 = New Brunswick

  • 8 = Nova Scotia

  • 9 = Prince Edward Island

  • 0 = Newfoundland

  • N = Nunavut

  • T = Northwest Territories

  • Y = Yukon Territory

Canadian Registration Numbers (CRN numbers) identify unique pressure equipment designs for use in Canada, and must meet requirements. Each design concept has a unique number. One Canadian Registration Number can represent millions of individual items, each with a different serial number, that all conform to the CRN design.

A product may be registered to more than one province or territory at same time. In this case, the first digit or letter after the decimal refers to the first registering province or territory. For example, a design registered first in Ontario and then in Alberta might be issued the number 4321.52

Canadian provincial regulatory authorities have cooperated to help ensure CRN numbers are tracked nationwide, and identifiable across provincial boundaries. CRN numbers are required to be stamped on equipment or, in the case of very small fittings, trackable with other identification markings.

CSA B51, the Canadian “Boiler, Pressure Vessel, and Pressure Piping Code”, describes the required rules of CRN use in detail. Part 1, Clause 4 specifies that pressure fittings, pressure vessels, and boilers are assigned CRN numbers with the acceptance of regulatory authorities in provinces where the equipment is to be used.

Vessel and boiler CRN numbers never start with a “0”. Fitting CRN numbers always do.

All CRN numbers have a decimal point that follows the prefix assigned by the regulatory authority.

For fittings, the letter following the “0” in the prefix corresponds to CSA B51 Table 1, and is used by regulatory authorities at their discretion to categorize the fitting according to type:

  • A – pipe fittings

  • B – flanges

  • C – line valves

  • D – flexible connections

  • E – strainers, filters, separators, traps

  • F – instrumentation

  • G – over pressure protection devices

  • H – items not in categories A to G


Canadian Registration Number (CRN)

The Canadian Standards Association (CSA) developed standards for the fabrication of Boilers, Pressure Vessels and Pressure Piping under the auspices of CSA Standard B51 (Boiler, Pressure Vessel and Pressure Piping Code). This code is established to maintain agreed-upon standards of quality, performance and interchangeability and/or safety. CSA B51 is roughly equivalent to the American Society for Mechanical Engineers (ASME) Code for Pressure Piping, B31. CSA B51 references a variety of ASME standards and defers to “recognized North American standards” for a number of the requirements of the Canadian Standard.

What are three parts to the CSA B51

  1. Requirements for boilers, pressure vessels, pressure piping and fittings. Promotes safe design, construction, installation, operation, inspection, testing and repair practices

  2. Requirements for high-pressure cylinders for on-board storage of fuels for automotive vehicles. Specifies minimum requirements for serially-produced lightweight refillable gas cylinders

  3. Requirements for compressed natural gas & hydrogen refueling station pressure piping systems and ground storage vessel



Located in Calgary, AlbertaVancouver, BCToronto, OntarioEdmonton, AlbertaHouston TexasTorrance, CaliforniaEl Segundo, CAManhattan Beach, CA; Concord, CA; We offer our engineering consultancy services across Canada and United States. Meena Rezkallah.

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