This Standard applies to the measurement of airborne noise emitted by assemblies comprising steam turbines and driven machinery, herinafter referrred to as turbine sets. These sets are of all sizes without limitation of output when fitted with their normal auxiliaries. This standard applies only to the part of the turbine set (turbine, generator and attached components) located above the floor of the turbine room and inside a continous enveloping measurement surface bounded by this floor.
An extensive and continous turbine operating floor of a reflecting nature above the turbine foundation floor level shall be considered as the reflecting plane.