Wet gas flow has adverse effects on all gas meters. Both orifice meters and USM have degraded performance in wet gas applications. Wet gas causes the orifice meter to significantly over-read the gas flow. However, this over-reading is predictable and for a known liquid flow rate an ISO-published correction factor can correct the gas flow rate prediction to 2% at 95% confidence. Furthermore, an orifice meter liquid monitoring system is available that can specifically identify wet gas flow by XLM ≥ 0.01. Wet gas causes the ultrasonic meter to significantly over-read the gas flow. To date, no ultrasonic meter correction factor has been published. However, the USM diagnostic system is capable of identifying a generic problem exists by a wetness of XLM ≥ 0.01.
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