Method and apparatus for determining the gas flow rate of a...

Measuring and testing – Volume or rate of flow – Using differential pressure

Reexamination Certificate

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Reexamination Certificate

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10547257

ABSTRACT:
A method and apparatus are provided for determining the gas flow rate of a gas-liquid mixture which has a gas volume fraction (GVF) of at least 85% and which is conveyed along a conduit. The conduit is fitted with a differential pressure flow meter and a fluid densitometer. The method comprises: measuring the pressure difference across the differential pressure flow meter and measuring the density of the mixture using the densitometer; estimating the GVF of the mixture from the measured density; and calculating the gas flow rate from the measured pressure difference and measured density. A corrective term which comprises the estimated GVF is used in the calculation to correct the gas flow rate for the high GVF value of the mixture.

REFERENCES:
patent: 4856344 (1989-08-01), Hunt
patent: 6234030 (2001-05-01), Butler
patent: 6382032 (2002-05-01), Hatton et al.
patent: 6405604 (2002-06-01), Berard et al.
patent: 6603047 (2003-08-01), Wiese et al.
patent: 2 351 810 (2001-01-01), None

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