Transient bubble remediation in coriolis flowmeters

G - Physics – 01 – F

Patent

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G01F 1/84 (2006.01) G01F 1/74 (2006.01) G01N 9/00 (2006.01)

Patent

CA 2344830

A Coriolis flowmeter (5) is operable as a vibrating tube densitometer where a flow tube (103A-103B) is driven to vibrate at a fundamental frequency from which density of the material flowing through the flow tube (103A-103B) may be calculated. The drive gain is monitored as an indicator of multiphase flow including gas and liquid components where a substantial increase in drive gain indicates gas damping of the flowtube vibrations due to a transient bubble entering the flowtube. The gas damping effects of the transient bubble and the correspondingly reduced density readings are remediated by the use of historical density measurements corresponding to periods of flow when no transient bubble has entered the flowtube.

L'invention porte sur un débitmètre (5) à effet de Coriolis qui peut être utilisé comme densitomètre à tube vibratoire. Le débitmètre comprend un tube (103A-103B) qui est entraîné de façon à vibrer à une fréquence fondamentale à partir de laquelle la densité du matériau s'écoulant dans le tube peut être calculée. Le gain de commande est contrôlé comme un indicateur d'écoulement polyphasique renfermant des composants gazeux et liquides, une augmentation importante du gain de commande indiquant l'amortissement gazeux des vibrations du tube dues à une bulle transitoire pénétrant dans le tube d'écoulement. On remédie aux effets d'amortissement gazeux de la bulle transitoire et aux relevés de densité réduits correspondants par des mesures de densité historique correspondant aux périodes de l'écoulement lorsqu'aucune bulle transitoire n'a pénétré dans le tube d'écoulement.

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