As a starting point consult the Saskatchewan Boiler & Pressure Vessel Act, 1999 for useful information on pressure equipment exemptions and requirements. Always consult the chief inspector of a jurisdiction.
The Technical Safety Authority of Saskatchewan Boiler and Pressure vessel site provides information, forms and useful contacts, and exemptions.
It is not recommended to obtain a fitting registration through CSA as long delays can result and additional fees will be added.
Not unlike Quebec, Saskatchewan and Manitoba certain categories of fittings are exempt from registration in British Columbia. The link to this is found here.
Consult the the Saskatchewan website for more comprehensive and up-to-date information.