Canadian Registration Number (CRN)

The CRN (Canadian Registration Number) system is the Canadian method of reviewing and registering the design of pressure vessels, piping systems and the fittings used to make them.

  • All Canadian provinces and territories, collectively called jurisdictions, use the CRN system.
  • The system is governed by the general CSA B51 standard, but every jurisdiction adds their own specific rules to make the standard enforceable.
  • The B51 standard is not a stand alone design code. ASME codes like VIII-1 and B31.3 provide the design and production methods. B51 adds some more rules specific to Canada.
  • Ideally design review and QC acceptance is completed prior to construction. It must be done prior to use.
  • CRN registration is required for each jurisdiction where the equipment is used.
  • Once registered, fabrication and inspection is handled the same as with National Board production.
  • Once registered any number of identical vessels or fittings can be produced.
  • CRN registered products can be built anywhere in the world.

Issues that regularly arise with CRN registration:

  • Fittings must be designed to a code like B31.3 and built under a QC program.
  • Vessels need to be fully compliant to the current code rules, including details like weld sizes and inspection openings.
  • It is reasonable to budget a half year for design registration in all jurisdictions. Typical times are less, but it can takes longer.
  • CRN specific knowledge is required for successful registration – some is documented, and some is not.
  • A design is reviewed seven times if it will be used Canada wide. A failure in one jurisdiction can lead to redesign and restarting the whole process. It is important to design conservatively.
  • It is hard to find registered fittings for use in vessels and piping systems.
  • Registration fees are 130 times as higher than National Board.

It is important to understand this when planning pressure equipment for Canada. The pages below are resources and an introduction to the CRN system. Pressure Vessel Engineering offers extensive design and CRN registration services. Our advertisement is at the bottom of the page.

Essential CRN Resources




Understanding the CRN System




CRN Blog


CRN Registration at PVEng

We are Canada’s largest independent registrar of fittings, vessels and piping under the CRN program registering for more than a thousand customers. We are experts in the specialized field of pressure equipment design and registration.

  • Integrated design, review and registration services
  • Extensive knowledge of registration requirements, including what needs registering and what is exempt province by province
  • We work to many ASME codes – VIII-1, VIII-2, I, IV, B31.1, B31.3, B31.5 and others
  • Design validation by burst test to many codes

Other Services

ASME Code DesignWe work to many ASME standards to design and validate pressure vessels, boiler, fittings and piping systems.

Finite Element Analysis (FEA)We use FEA to design and validate fittings and vessels that cannot be designed by rule-based codes like VIII-1 or B31.3.

Pipe Stress Analysis Pipe stress analysis is mandatory for British Columbia registration and it is recommended practice for many other systems.

About Us

Pressure Vessel Engineering has twenty years of successful experience in the pressure vessel field working for more than a thousand customers.

  • Six Professional Engineers on staff licensed to stamp and sign off on designs for use in all Canadian jurisdictions.
  • Fast and professional assistance from our 20-person company.

Need help? Our contact information is to the right.