『Requirements for straight pipe section of vortex flowmeter』Related information(clamp on meter|electromagnetic meter|venturi meterrotameter|orifice meter|ultrasonic flow meter|mass flow meter|coriolis mass flow meter|coriolis flow meter|magnetic flow meter|magmeter flow meter|magflow flow meter|mag meter flow meter|electromagnetic flow meter|vortex flow meter|turbine flow meter|thermal mass flow meter|thermal flow meter|rotameter flow meter)
1. Requirements for vertical installation of straight pipe section for measuring steam with vortex flowmeter
The core requirements for the vertical installation of straight pipe section when measuring steam with vortex flowmeter are: the upstream straight pipe section usually requires a slag thickness of 15-20D, and the downstream section requires 5-10D. If there are structural changes in the pipeline, the upstream straight pipe section needs to be extended, and a flow equalizer can be installed to correct the flow field when space is limited. Under normal installation requirements, the upstream and downstream of the sensor should maintain equal diameter straight pipe sections. Specifically, the length of the upstream straight pipe section is 15-20D, and the length of the downstream straight pipe section is 5-10D, where D is the inner diameter of the process pipeline. This configuration can reduce fluid disturbance, ensure stable steam flow state, and avoid measurement deviation. 2. The influence and adjustment of tapered/expanding pipes. If there is a tapered pipe upstream (such as the pipe diameter changing from large to small), the upstream straight pipe section needs to be extended to not less than 15D, and the downstream should be maintained at ≥ 5D. If there is a tapered pipe upstream (the pipe diameter changing from small to large), the upstream straight pipe section needs to be increased to not less than 25D, and the downstream still needs to be ≥ 5D. Such adjustments can offset the turbulence interference caused by sudden changes in the pipe section. 3. Special space limitations. When the installation space cannot meet the length of the straight pipe section, a flow equalizer can be installed upstream
2. 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,
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