CRN vs ASME Stamp vs National Board Registration

Many US manufacturers assume that an ASME stamp is sufficient for Canadian compliance. It is not. The ASME stamp, National Board registration, and CRN serve three distinct purposes, and Canadian regulations require all three for most pressure vessels.

What Each Certification Covers

• ASME Stamp (U, S, H, etc.): Certifies the manufacturer's quality management system — not the specific design
• National Board Registration (NB): Creates a permanent record of the vessel tied to the Manufacturer's Data Report
• CRN: Registers the specific design with a Canadian provincial authority — mandatory in all 13 jurisdictions

The Common Misconception About ASME Stamps

An ASME 'U' stamp confirms that the manufacturer's facility and quality system have been audited. It says nothing about whether the specific design has been reviewed and accepted by a Canadian provincial authority. Canada requires that additional review — the CRN — before equipment can be installed.

How Kopfkino Integrates All Three

Our CRN submission packages are designed to align with ASME code requirements and National Board documentation from day one. We review ASME calculations, confirm NB registration status, identify gaps, and prepare CRN applications that provincial authorities can approve without additional requests for information.

Frequently Asked Questions

Can I get a CRN without an ASME stamp?

For pressure vessels, ASME stamp is typically required. For fittings, alternative proof-of-design methods (burst testing) may be accepted instead.