CRN meaning in Regional ?

Canadian pressure laws, Acts, rules & regulations are enforced by provincial and territorial safety authorities. Unlike the United States where licensed professional engineers (PE) may stamp pressure equipment and pressure system/plant drawings in the non-nuclear sectors for construction, in Canada in general a professional engineer (P.ENG) who is not employed by a safety authority does not have that same right to stamp regulated pressure equipment or pressure system drawings for construction, and doing so may result in fines or professional license revocation, or jail time. The pressure safety design registration approval given by safety authority registrars in Canada is called a Canadian Registration Number (CRN). Pressure equipment must be registered in each province or territory where it will be used.

In addition to design registration, inspection after construction is also required in Canada and provincial and territorial safety authorities vary in their monopoly of the employment of such inspectors, depending also upon the pressure system type and scope, or the resources and scope of a particular safety authority.

Although NB-370 describes Canadian and U.S. jurisdictions, due to the significant difference between Canadian and U.S. pressure safety laws, rules and regulations, this Wikipedia article provides a supplement for Canada. Unlike the United States, there is currently no known Canadian government or safety authority resource, either federally or provincially, that consolidates the Canadian pressure regulation in the manner of this article.

Although the preceding makes mention of ASME, there exist other pressure equipment and piping standards and codes which are law in Canada such as American Petroleum Institute standards, and CSA standards, to name a few. Be sure to check with the chief inspector / regulator/ safety authority in the jurisdiction that pressure equipment is intended to be used before proceeding with procurement, build, fabrication or related construction activities.