This British Standard specifies the construction and maintenance requirements of indirectly and directly driven single-stage centrifugal booster assemblies (hereafter referred to as machines), working on first, second or third family gas, having an outlet pressure of not greater than 150 mbar.

This standard is not applicable to positive displacement gas and slide vane type compressors.

This standard is also applicable to machines with outlet pressures not greater than 150 mbar used on landfill gases or biogases or gas/air mixtures, provided that any additional design and safety issues have been incorporated.

Though applicable to single-stage machines only, this standard can be used as a basis for multi-stage machines where, in general, pressures higher than 150 mbar are achieved.