What They Mean and Why Both Matter in Canadian Projects

ASME Nameplate — Code Compliance Mark

The ASME nameplate confirms that a pressure vessel was designed, fabricated, inspected, and tested in accordance with the ASME Boiler & Pressure Vessel Code (2023 edition).

It represents manufacturing compliance and quality control under an authorized inspection system.

Typical ASME nameplate information includes:

• Manufacturer name and location
• Year built
• MAWP and design temperature
• Serial number
• Material specification
• ASME certification mark (e.g., U stamp)
• National Board number (if registered)

Example — ASME Vessel Nameplate Layout

An ASME nameplate tells inspectors how the vessel was built.

It does not automatically grant permission to install the vessel in Canada.

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CRN Nameplate — Legal Acceptance in Canada

The CRN (Canadian Registration Number) confirms that the design itself has been reviewed and accepted by provincial authorities.

It represents jurisdictional approval, not fabrication quality.

CRN markings typically include:

• CRN number with province suffix
• Sometimes design pressure/temperature reference
• May appear on the main nameplate or a secondary plate

Example — CRN Marking on Canadian Equipment

A CRN confirms legal acceptance for installation in Canada.

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Practical Difference (Short Version)

Aspect	ASME Nameplate	CRN Marking
Confirms fabrication to code	✔	✘
Confirms legal approval in Canada	✘	✔
Issued by	Manufacturer + Authorized Inspector	Provincial authority
Applies to	Individual vessel	Design model
Needed in Canada	Often expected	Usually mandatory

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Why Projects Need Both

For equipment entering Canada:

• ASME stamp shows the vessel was built correctly
• CRN proves the design is allowed to be installed

Missing either one can delay registration or site approval.