EngRx knows the Canadian Registration Number (CRN) process….

Canadian Provincial jurisdictions are regulated by CSA B51 which mandates that pressure equipment is registered. Drawings, calculations and plans are to be submitted to Provincial Boiler Authorities who will review documentation to code or engineering theory, and if found acceptable, will issue a CRN. As well, pressure equipment must be manufactured under an acceptable Quality System. To the unfamiliar, this process can be onerous.

CSA B51 is brought into enforcement through Provincial legislation. For example, in Alberta, the Safety Codes Act includes the Pressure Equipment Safety Regulation. This Regulation effectively brings CSA B51 into force.

CSA B51 states that repeated construction of a pressure equipment design with a valid CRN is permissible until a code, Act or standard invalidate the design. Unless stated otherwise within the code, Act or Standard, CSA B51 allows 6 months for a design to be revised to meet new requirements.

The frequent question of whether a design change will affect the validity of a CRN is also addressed in CSA B51. Revisions to an existing registered design that require a change in design calculations or otherwise affect the pressure-retaining capability of the pressure equipment need to be submitted for CRN re-registration or new registration. Provincial Regulations can be more restrictive relative to design changes, whereas all design changes can be required to be assessed for validity of CRN by Provincial Safety Authority Design Survey Engineers.

ASME codes are the mandated design codes for vessels, piping and fittings, whereas pipeline design falls under CSA Z662.

Pressure Vessels and Category H Fittings with a Maximum Allowable Working Pressure lower than 15 psi do not fall within the requirements of CSA B51 and therefore do not require a CRN. The following flow chart is extracted from the recent version of CSA B51. It is shown as an example of the logic provided by the specification and clarifies CRN requirements for some pressure equipment used in liquid service not more hazardous than water. Other similar flow charts are found within the specification.


A Canadian Registration Number (CRN) is allocated by the provincial regulatory authority and uniquely identified by a suffix following a decimal point. Identifiers per province are as follows:

1 British Columbia

2 Alberta

3 Saskatchewan

4 Manitoba

5 Ontario

6 Quebec

7 New Brunswick

8 Nova Scotia

9 Prince Edward Island

0 Newfoundland

T Nothwest Territories

Y Yukon

N Nunavit

An example CRN could be as follows: 5278.5 (issued from Ontario) and 5278.52 (issued from Ontario and Alberta). If a letter C is used in the CRN suffix, it designates that the design is registered in all provinces and territories. Once a design has been registered in one province, it may be simultaneously submitted to all remaining provinces.

The CRN of a pressure fitting will have a “0” leading the registration number.

The manufacturing of pressure equipment for operation in Canada must be done under a satisfactory quality control program. It will be the responsibility of the manufacturer to provide information to the regulatory authority that proves the quality control program is functioning. Normally the quality control program would include an outside auditor review and acceptance. The format of an ISO type quality program is acceptable. Within Canada, pressure equipment quality control programs are audited directly by regulatory authority representatives and upon successful completion of the audit, a Certificate of Authorization may be issued to the organization.



In February 2016, ABSA introduced new regulations (Requirements for Engineering Pressure Enclosures, “EPE”) related to the Leak Sealing industry found in their release of the AB-521 document. The intention of the new requirements are to increase diligence in all segments of executing on-line leak repair (Leak Sealing). Facility owners are now encouraged to pre-register an RRIMR with ABSA to qualify future Leak Sealing enclosures under the new “streamlined” CRN process. As well, after the pressure equipment owners have registered their RRIMR, cataloged Leak Sealing Enclosures will qualify for installation through the ABSA streamlined CRN process.  Leak Sealing contractors are now required to provide operations procedures for the safe installation of Leak Sealing enclosures as part of the CRN application process. Under ABSA AB-521, special consideration will need to be given when covering; Localized Thinned Area (LTA), Cracks, ASME B31.1 and Pressure Vessel related leaks. When Local Thinned Areas are present, the rules of ASME Section VIII Division 1 Appendix 32  related to the width and depth of the affected area are to be considered. Diligent NDE will need to be a requirement to complete analysis according to Appendix 32. When leaks or equipment pressure integrity issues are identified, ABSA AB-521 requires equipment owners to perform and report: Risk Assessment, Root Cause and a Maintenance and Monitoring System. In summary, owners, installers and engineers will need execute in close collaboration to meet the new requirements.

Refer to the following ABSA AB-521 link for more details:


EngRx understands and continuously participates in the Canadian pressure equipment regulatory processes. Our team consults and manages projects through the CRN process on your company’s behalf. We will navigate your project through application submission, design review, design finding response and final resolution to CRN.

Call us for further details related to your requirements for design registration. Our experience will deliver results

EngRx Corp. | 4929 – 74 Ave, Edmonton, Alberta, Canada | Phone: 780-784-9710