Tech Note 6 - GT 400 Upstream Piping Surface Roughness Test Results

Traditionally gas ultrasonic meters are sent to a flow calibration facility with the upstream and downstream piping spools that will be installed in the field. Clients typically specify using a flow conditioner along with two upstream and one downstream spool. AGA Report No. 9 defines this combination of piping, flow conditioner and meter as a “metering package.” The reason for calibrating the USM with the specific spools and flow conditioner used for the field installation is ensure there is no bias that might arise by using different piping or flow conditioners. Shipping the complete metering package from the fabricator to the calibration facility and then on to the final destination can be costly. Typically, the complete metering package is also not disassembled after testing due to concerns this might affect the meter’s accuracy.

Click here for the complete article