Application
 2. (1) This Regulation applies to the design, construction, maintenance, use, operation, repair and service of boilers, pressure vessels and piping.  O. Reg. 220/01, s. 2 (1). (2) This Regulation does not apply to, (a) a boiler that is used in connection with a hot liquid heating system that has no valves or other obstructions to free circulation between the boiler and an expansion tank that is vented freely to the atmosphere; (b) a low pressure boiler that has either a wetted heating surface of 30 square feet (2.79 square metres) or less, or a power rating of 30 kW or less; (c) a boiler having a heating surface of 10 square feet (0.93 square metres) or less; (d) a pressure vessel, fitting or piping that contains a gas, vapour or liquid at a maximum allowable working pressure of 15 psi (103 kPa) or less; (e) a pressure vessel, fitting or piping that contains liquids not more hazardous than water and that operate at a temperature of 150°F (65°C) or less and at a maximum allowable working pressure of 250 psi (1,717 kPa) or less; (f) a pressure vessel for domestic use that has an internal diameter of 24 inches (610 mm) or less for the storage of hot water where the temperature does not exceed 212°F (100°C) and the heat input is 120 kW or less; (g) a pressure vessel that is used exclusively for hydraulic purposes at a temperature no greater than 150°F (65°C); (h) a pressure vessel that has an internal diameter of 24 inches (610 mm) or less that is connected in a liquid pumping system at a temperature that does not exceed 150°F (65°C) and that contains air or an inert gas compressed to serve as a cushion; (i) a refrigeration piping that has a capacity of three tons (11 kW) or less of refrigeration or a capacity of five tons (18 kW) or less of refrigeration in an air conditioning system; (j) pressure piping that forms part of the heating system in a building that is, (i) heated by steam at a pressure not exceeding 15 psi (103kPa), or (ii) heated by water at a pressure not exceeding 160 psi (1,100 kPa) and at a temperature that does not exceed 250°F (121°C); (k) compressed air piping, up to and including ¾ inch nominal pipe size; (l) hot oil piping, where the pressure is not greater than 100 psi (687 kPa) and the operating temperature is not less than 50°F (10°C) lower than the flash point of the oil; (m) pressure containers that form an integral part of or that are a component of rotating or reciprocating mechanical devices, including pumps, compressors, turbines, generators, engines and hydraulic or pneumatic cylinders where the primary design considerations or stresses, or both, are derived from the functional requirements of the device; (n) automatic fire protection systems that are designed and installed in accordance with Ontario Regulation 332/12 (Building Code) and Ontario Regulation 213/07 (Fire Code); (o) any component or system related to the subject matter of this Regulation that is regulated under any Act or regulation of the Government of Canada unless specifically requested otherwise by the Government of Canada; (p) buried water piping that operates at a temperature of 150°F (65°C) or less at a maximum allowable working pressure of 740 psi (5,100 kPa). (q) a pressure vessel having a capacity of 1 and one-half (1½) cubic feet (42.5L) or less, that is not a fitting; (r) a pressure vessel having an internal diameter of six (6) inches (152mm) or less; (s) inert-gas filled high voltage switchgear and control gear with an internal pressure that does not exceed 150 psi (1,030 kPa), rated 15 kW and above that are located within an electric utility installation that has controlled access for maintenance or repair and that is not accessible to the public; (t) flexible hoses and portable air piping used in mines; (u) piping, pressure vessels and fittings regulated by any one of the following regulations made under the Act: (i) Ontario Regulation 210/01 (Oil and Gas Pipeline Systems), (ii) Ontario Regulation 211/01 (Propane Storage and Handling), (iii) Ontario Regulation 212/01 (Gaseous Fuels), (iv) Ontario Regulation 213/01 (Fuel Oil), or (v) Ontario Regulation 214/01 (Compressed Gas).  O. Reg. 220/01, s. 2 (2); O. Reg. 420/17, s. 2. Operating and Other Requirements