On site vortex flowmeter | Doppler open channel flowmeter

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How to deal with the length of the straight pipe section of the vortex flowmeter not meeting the standard in industrial sites?

When the length of the upstream straight pipe section of the vortex flowmeter in the industrial field does not meet the requirements, the following two main measures can be taken:

Firstly, the principle of using the method of correcting the basic error: when the upstream straight pipe section does not meet the specified requirements, it will cause the instrument coefficient to fluctuate with a deviation of K and additional errors in accuracy, and the error impact can be reduced through correction.

. For example, based on the requirements for the length of the straight pipe section of different forms of flow blocking components in the upstream of the vortex flowmeter, when the upstream straight pipe section does not meet the regulations, it will cause a deviation in the instrument coefficient K, and the deviation value can be estimated through relevant charts. For example, according to relevant regulations, if there is a 90 ° single bend upstream of the vortex flowmeter, the upstream straight pipe section should have a length of 30D. When the actual length of the straight pipe section on site is only 20D, it will cause a deviation in the instrument coefficient K. Estimation method: Referring to the relevant curve chart, draw a vertical line at the horizontal axis 20DN to intersect with the real curve. From this intersection point, draw a line parallel to the horizontal axis and intersect with the vertical axis. The intersection point indicates the maximum deviation value between the K coefficient and the reference K coefficient (obtained through laboratory calibration). For ex On site vortex flowmeter

ample, at 20DN, the maximum deviation value may be ± 0.6%. On the other hand, the intersection of the perpendicular line of the horizontal axis and the imaginary curve at 20DN, and the intersection of the parallel line of the horizontal axis and the vertical axis at this point, indicate that the accuracy of the instrument will exceed the reference accuracy (laboratory calibration value). If the reference accuracy of the instrument for measuring liquid flow is ± 0.75%, and for an additional accuracy of ± 0.35%, the overall accuracy of the instrument is ± 1.1%.

Secondly, the function of installing a flow regulator: When the length of the upstream straight pipe section of the vortex flowmeter is insufficient and there is no effective data to correct the instrument coefficient deviation and accuracy due to the insufficient length of the straight pipe section, installing a flow regulator can eliminate the influence of vortices and velocity distribution distortion caused by upstream flow blocking components.

. The vortex flowmeter is based on the Karman vortex principle, and its measurement accuracy and stability are highly dependent on the length of the upstream straight pipe section. Installing a flow regulator can make the fluid velocity distribution uniform and stable, eliminate flow field distortion and vortex interference caused by bends, valves, etc., ensure measurement accuracy and signal quality, reduce measurement errors, and ensure the stable and reliable operation of the flowmeter. Classification and Characteristics: (a) Category: Mainly aimed at eliminating vortices, with minimal added resistance and pressure loss after installation. (b) Class: Used to eliminate vortices and improve moderate velocity dis

On site vortex flowmeter | Doppler open channel flowmeter

How to deal with the length of the straight pipe section of the vortex flowmeter not meeting the standard in industrial sites?

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