Averaging orifice primary flow element

G - Physics – 01 – F

Patent

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Details

G01F 1/34 (2006.01) G01F 1/42 (2006.01)

Patent

CA 2481869

A process flow device that includes a self-averaging orifice plate type of primary flow element (2) for measuring, by a differential pressure process, the volumetric rate of fluid flow at a point in a fluid carrying conduit (8) where the velocity profile (7) of the fluid is asymmetric with respect to the longitudinal axis of the conduit. The improved flow element comprises a planar flow-impeding plate (2) disposed transversely across the interior of the conduit (8) and perpendicular to the longitudinal axis thereof. The plate includes at least three circular apertures (22) eccentrically disposed with respect to the longitudinal axis of the conduit to create static pressure averaging on the downstream side of the plate. Upstream and downstream static pressure sensing ports are respectively provided on opposite sides of the flow impeding plate.

L'invention concerne un dispositif d'écoulement de procédé comprenant un type de plaque à orifice moyennant automatiquement un élément d'écoulement principal afin de mesurer par un processus de pression différentielle, le débit en volume d'un écoulement fluide en un point d'un conduit où le profil de vitesse du fluide est asymétrique par rapport à l'axe longitudinal du conduit. L'élément d'écoulement amélioré comprend une plaque planaire entravant l'écoulement (2) placée de façon transversale à travers l'intérieur du conduit (8) et perpendiculaire à l'axe longitudinal de celui-ci. La plaque comprend au moins trois ouvertures circulaires (22) placées de façon excentrique par rapport à l'axe longitudinal du conduit en vue de créer une moyenne de pression statique sur le côté inférieur de la plaque. Des ports de détection statique supérieure et inférieure sont respectivement ménagés sur les côtés opposés de la plaque entravant l'écoulement.

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