B51-97, Part 3

1. Scope 1.1 CSA Standard B51-97, Part 3, contains mandatory requirements for compressed natural gas (CNG) refuelling station pressure piping systems and ground storage vessels. 1.2 Pressure piping systems covered in this Part are those systems (a) between the termination of the utility's piping, usually at the meter, and the inlet to the compressor assembly at a CNG refuelling station, if the design pressure exceeds 414 kPa (60 psi); and (b) from the inlet to the compressor assembly through to the dispenser nozzle, except for the mechanical parts of the compressor and any subsystems designed for 414 kPa (60 psi) or less. 1.3 Ground storage vessels covered in this Part are pressure vessels installed at CNG refuelling stations and intended to store CNG at pressure for delivery to vehicle fuel tanks.