Apparatus and method for compensating a coriolis meter
First Claim
1. A flow measuring system for measuring density of a fluid flowing in a pipe, the measuring system comprising:
- a coriolis meter having at least one tube wherein fluid flows therethrough, the coriolis meter providing a frequency signal indicative of a natural frequency of a tube and/or phase signal indicative of a phase difference between a pair of tubes;
a flow measuring device measures the speed of sound propagating through the fluid, the measuring device providing at least one of an SOS signal indicative of the speed of sound propagating through the fluid, a GVF signal indicative of the gas volume fraction of the fluid and a reduced frequency indicative of the reduced frequency of the fluid; and
a processing unit determining a compensated mass flow rate measurement in response to at least one of the SOS signal, the GVF signal and the reduced frequency signal and the phase signal, and/or determining a compensated density measurement in response to the SOS signal, the GVF signal and the reduced frequency signal and the frequency signal.
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Accused Products
Abstract
A flow measuring system is provided that provides at least one of a compensated mass flow rate measurement and a compensated density measurement. The flow measuring system includes a gas volume fraction meter in combination with a coriolis meter. The GVF meter measures acoustic pressures propagating through the fluids to measure the speed of sound αmix propagating through the fluid to calculate at least gas volume fraction of the fluid and/or the reduced natural frequency. For determining an improved density for the coriolis meter, the calculated gas volume fraction and/or reduced frequency is provided to a processing unit. The improved density is determined using analytically derived or empirically derived density calibration models (or formulas derived therefore), which is a function of the measured natural frequency and at least one of the determined GVF, reduced frequency and speed of sound, or any combination thereof. The gas volume fraction (GVF) meter may include a sensing device having a plurality of strain-based or pressure sensors spaced axially along the pipe for measuring the acoustic pressures propagating through the flow.
166 Citations
8 Claims
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1. A flow measuring system for measuring density of a fluid flowing in a pipe, the measuring system comprising:
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a coriolis meter having at least one tube wherein fluid flows therethrough, the coriolis meter providing a frequency signal indicative of a natural frequency of a tube and/or phase signal indicative of a phase difference between a pair of tubes;
a flow measuring device measures the speed of sound propagating through the fluid, the measuring device providing at least one of an SOS signal indicative of the speed of sound propagating through the fluid, a GVF signal indicative of the gas volume fraction of the fluid and a reduced frequency indicative of the reduced frequency of the fluid; and
a processing unit determining a compensated mass flow rate measurement in response to at least one of the SOS signal, the GVF signal and the reduced frequency signal and the phase signal, and/or determining a compensated density measurement in response to the SOS signal, the GVF signal and the reduced frequency signal and the frequency signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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Specification