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Title: INSTALLATION EFFECTS UFM, SKID CALIBRATION, NONSENSE OR NECESSITY?
Author: Marcel Vermeulen Dave van Woensel Sacco Tange Jan Drenthen
Source: 2017 North Sea Flow Measurement Workshop
Year Published: 2017
Abstract: It is common practice to calibrate custody transfer ultrasonic gas flowmeters with dedicated upstream piping and, in a more conservative approach also with a flow conditioner. Argument is this will create repeatable circumstances, meaning the flow profile in the field will be identical to the one seen during calibration. In recent years this approach has been complemented by a new generation of ultrasonic flowmeters that have reported to possess a very limited impact on measurement uncertainty in case of flow profile variations during, for example, OIML R137 disturbance tests. Despite these arguments a discussion is ongoing whether it makes sense to calibrate entire Z-configuration measurement skids instead of only meters. Thought behind this is it will make the flow profile even more repeatable which could further reduce the measurement uncertainty. To conclude this discussion KROHNE calibrated multiple Z-configuration skids.

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