ASME MFC-11:2006 pdf free download

ASME MFC-11:2006 pdf free download.Measurement of Fluid Flow by Means of Coriolis Mass Flowmeters.
Hence, we see that (direct or indirect) measurement of the Coriolis force on an oscillating tube can provide a determination of the mass flow rate. This is the basic principle of operation of the Coriolis flowmeter.
3.1.2 CorlolIs Flow Sensor. In commercial designs of Coriolis flowmeters, the generation of inertial forces through continuous rotary motion is not practical and instead the necessary forces are generated by oscillating the tube.
In one class of Coriolis flowmcters, the oscillating tube is anchored at two points and oscillated at a position between the two anchors, thus giving rise to opposite oscillatory rotations of the two halves of the tube. In another version, a section of tube is oscillated and a transverse Coriolis force is generated. Coriolis flowmeters have one or more oscillating tube(s) that are straight or curved.
The smallest driving force required to keep the tube in constant oscillation occurs when the frequency of oscillation is at, or close to, the resonant frequency of the filled oscillating tube.
The movement of the oscillating tube(s) is measured at various points. When flow is present, Coriolis forces act on the oscillating tube(s), causing a small displacement, deflection, or twist that may be observed as a phase difference between the sensing points.
Coriolis forces (and hence distortion of the oscillating tube) only exist when both axial flow and forced oscillation are present. When there is forced oscillation but no flow, or flow with no oscillation, no deflection will occur and the Coriolis fiowmeter will show no output.
The flow sensor is characterized by flow calibration factors that are determined during manufacture and calibration. These values are unique for each sensor and should be recorded on a data plate secured to the sensor.
3.1.3 Corlolis Transmitter. A Coriolis meter requires a transmitter to provide the drive energy to oscillate the measuring tubes and process the measurement signals to produce a mass flow rate measurement. The mass flow rate can he integrated and retained in memory and/or displayed by the transmitter.
Additional parameters exist within the transmitter softis’are that should be configured for the specific application. Other coefficients must also he entered if density or volume outputs are required.