Abstract
A sonic nozzle is a flow metering device often used as a reference meter in metrology laboratories for its good repeatability and accuracy. The thermodynamic conditions prevailing in the nozzle throat can be such, however, that some components of the flow medium will condense and therefore modify the nozzle geometry, a critical factor of the discharge coefficient. Several cases are reported where elemental sulfur condenses under specific conditions. At K-Lab, partial elimination of sulfur-bearing components has permitted satisfactory operation at up to 100 bar. K-Lab is a gas metrology laboratory located at Kårstø (Norway). It is operated by Statoil and jointly owned by TOTAL Norge A.S. and Statoil.
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