CRN for Pressure Fittings in Canada

Reviewed by Dhruv Barot, P.Eng. · Last updated: March 1, 2026

Pressure fittings (valves, flanges, strainers, expansion joints, couplings, manifolds, and pressure relief devices) require individual CRN registration under CSA B51. Fittings are registered in categories A through H, each covering a different component type.

CSA B51 Fitting Categories A-H

• Category A: Pressure relief devices (safety valves, relief valves)
• Category B: Fittings with pressure-containing parts (valves, check valves)
• Category C: Bolted flange connections
• Category D: Flexible connections (expansion joints, hoses)
• Category E: Instrumentation fittings
• Category F: Pressure-containing specialty items
• Category G: Welded fittings (elbows, tees, reducers)
• Category H: Threaded fittings

Statutory Declaration: Unique to Fitting CRN

Fitting CRN applications require a Statutory Declaration: a legal document signed by a company officer and notarized before a Commissioner of Oaths. The declaration attests that all fittings produced under the CRN will be identical to the approved prototype.

Family Registration Strategy

OEMs with large product lines benefit from family registrations covering multiple sizes and pressure ratings under one CRN. Kopfkino structures valve family registrations that minimize total CRN count while maximizing product coverage.

Frequently Asked Questions

Do I need a separate CRN for each fitting size?

Not necessarily. A well-structured family registration can cover multiple sizes within defined parameters.

"Fittings are where CRN strategy pays for itself. A well-structured family registration can cover dozens of SKUs under one number, but only if the governing design and burst-test evidence are chosen correctly up front."