valve321,
Sometimes engineers use Sm3/h and m3/h interchangeably and use Am3/h to specify actual cubic meters per hour. The only way to be sure is to verify the pressure and temperature at which the volumetric flow rate was measured.
To correct to standard conditions (Qs), you need to correct the flowing temperature(Ta) and pressure (Pa) to standard T - P conditions using the combined gas laws:
PaQa/Ta=PsQs/Ts
where the subscript a refers to actual conditions and the subscript s refers to standard conditions. Also, you may need to correct for compressibility depending on your operating pressure and your working fluid.