July 2021, Vol. 248, No. 7

Features

Validating Meter Accuracy Simplified Using Flow Conditioning

By John Lansing, RMG Americas, Houston, Texas    Figure 1: Path velocity AGA Report No. 9 requires flow calibration for all applications to reduce the meter’s overall uncertainty.[1] Because of field installation effects, AGA 9 also discusses uncertainty requirements that an ultrasonic meter (USM) manufacturer must meet once the meter is installed.   All USM manufacturers provide piping recommendations to comply with the AGA 9 field uncertainty budget of ±0.3%. Traditionally, gas ultrasonic meters are flow-calibrated with upstream piping spools that include a flow conditioner.   The initial reason for calibrating the USM is to reduc

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