SOLUTIONS CENTRAL | September 2021 | mrfpr.com/blog
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Reasons to Measure Flow
•CUSTODY TRANSFER: Fluid passing from a supplier to a customer; Given the economic implications, custody transfer applications require high measurement accuracy.
•EFFICIENCY INDICATION: Input – Output
•PROCESS VARIABLE CONTROL: Process applications use flow rate control to manipulate such variables as pressure, level in a vessel.
•SAFETY: Flow measurement helps prevent accidents and ensures a safer working environment and product.
The Micro Motion Coriolis flowmeter measures the following process variables directly:
mass flow rate
Why Use Coriolis Mass
Volumetric flow metering is affected by changes in the temperature, pressure, density, viscosity, and flow profile of the process fluid.
Coriolis flow metering provides direct mass measurement that is unaffected by changing fluid characteristics.
Theory of Operations – Mass Flow
During a no flow condition, there is no Coriolis effect and the sine waves are in phase with each other.
When fluid is moving through the sensor's tubes, Coriolis forces are induced causing the flow tubes to twist in opposition to each other. The time difference between the sine waves is measured and is called Delta-T which is directly proportional to the mass flow rate.
Theory of Operation - Density
Density measurement is based on the natural frequency of the system including the flow tubes and the process fluid.
As the mass increases, the natural frequency of the system decreases.
As the mass decreases, the natural frequency of the system increases.
Recommended sensor orientations
Determined by the process fluid, minimize the risk of developing slug flow condition:
•For liquid processes, installing the tubes pointing down allows gases in the flowstream to bubble upward and out of the tubes without collecting.
•For gaseous processes, the tube's up orientation prevents condensate from accumulating in the tube bends.
•For slurries, the “flag” orientation is recommended because of the uneven consistency.
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