Use the following charts to determine if your vessel is classified as a Pressure Vessel, a Fitting, or if no CRN is required in Canada. Read the descriptions of what each classification requires. These charts are from the Canadian B51 standard and include more items as pressure vessels than the definition found in ASME VIII div 1 section U-1.
There is a grey area when it comes to determining if a vessels contents are not more hazardous than water or not. For assistance in deciding which chart to use, it is useful to have Material Safety Data Sheets (MSDS). The MSDS sheets will not specifically tell you which chart to use, but a review of the "Toxicity" and "Health Effects and First Aid" on the MSDS can help you decide. The jurisdictions are not responsible for classifying service, it is the responsibility of the owner/user to perform this evaluation.
Important note: These charts are from the Canadian B51 Standard. Each province also has a pressure vessel registration which modifies these charts. Be sure to check the regulation for the province that your product will be shipped to!
A Pressure Vessel (to ASME VIII-I, VIII-2 or VIII-3) must be built in a shop with an accredited quality control program, and the finished vessel inspected by an Authorized Inspector. For a pressure vessel built in the United States, the shops National Board and U-stamp authorization would be proof of the quality control program. The manufacturers data form signed by the National Board inspector would be proof that an authorized inspector has inspected the vessel. A CRN (Canadian Registration Number) is required, and is written on the manufacturers data form. The CRN is stamped on the vessel nameplate. (The OIN number - only used in Ontario - is being phased out).
A Fitting (to VIII-1, B31.1, B31.3) has the same quality control requirements as a pressure vessel, except that the final inspection will be by the shops own inspector instead of the National Boards inspector. A CRN (Canadian Registration Number) and a statutory declaration is required.
If No CRN is required, please note that sometimes the intended service would require the item to be built as a pressure vessel or a fitting.
Once you have determined what classification your vessel falls under, check with the jurisdiction where the vessel will be installed to make sure that they agree. See the Provincial Contacts for your contact information. Sometimes other standards will change the classification of the vessel. Some Jurisdictions have exemptions for some vessels - check the adoption regulations.