B51-97, Part 1

1. Scope 1.1 Except as provided for in Clause 1.2, this Standard applies to all boilers, pressure vessels, fittings, and piping, as provided for by the Act and defined in this Standard. Notes: (1) In certain provinces there may be variations in size limitations quoted in this Standard. Consultation with the regulatory authority is recommended. (2) Cylinders, spheres, tubes, and drums used in transportation are subject to the Transportation of Dangerous Goods Act and Regulations under that Act; it is not intended that the provisions of this Standard conflict with or supersede the requirements of that Act or Regulations in regard to the control of these containers when used for transportation by any mode. (3) Corresponding imperial values to the SI (metric) units are shown in parentheses for information only. Where nominal pipe sizes are shown they have been retained in nondimensional terms. (4) All pressures shown in the text are gauge pressures, ie, above atmospheric pressure. 1.2 Requirements for compressed natural gas refuelling station pressure piping systems and containers are covered in CSA Standard B51-95, Parts 2 and 3. 1.3 This Standard does not apply to pressure-retaining components as used in hydraulic elevators. 1.4 Where any Clause of this Standard is at variance with the referenced Codes and Standards, the requirements of this Standard govern.