Newfoundland and Labrador
As a starting point consult the Newfoundland & Labrador Boiler and Pressure Vessels regulation for useful information on pressure equipment exemptions and requirements. Always consult the chief inspector of a jurisdiction.
Newfoundland & Labrador Canadian Registration Numbers for fittings are issued by ACI Central who is the designated regulatory authority for seven provinces and territories that include: Newfoundland, Nunavut, Prince Edward Island, New Brunswick, Nova Scotia, North West Territories, Yukon. This small agency located on Prince Edward Island vastly simplifies what could be a terribly long and bureaucratic process of dealing with seven entities.
For boiler, pressure vessel and pressure piping system design registration applications, directly contact the Newfoundland & Labrador government, Boilers, Pressure Vessels and Compresses Gas site provides further information and useful contacts.