『Requirements for straight pipe section of electromagnetic 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. Standard length of electromagnetic flowmeter
Electromagnetic flowmeter itself does not have a fixed concept of "standard length", and its core installation requirements lie in the configuration of upstream and downstream straight pipe sections. The standard length you mentioned may be a common misunderstanding. The installation of an electromagnetic flowmeter aims to ensure measurement accuracy by providing a stable and symmetrical flow field for the fluid, which is mainly achieved by meeting the length requirements of its front and rear straight seepage pipe sections. According to the international standard ISO 20456:2017, for typical installation scenarios, the requirements for the straight pipe section are as follows: • The length of the upstream straight pipe section is usually required to be no less than 5 times the nominal diameter of the pipeline (≥ 5DN). The length of the downstream straight pipe section is usually required to be no less than 2 times the nominal diameter of the pipeline (≥ 2DN). Here "DN" refers to the nominal diameter of the pipeline, which is the basic unit for calculating the required length of the straight pipe section.
2. Example explanation: Taking a DN200 (nominal diameter of 200 millimeters) pipeline as an example, the required length of the straight pipe section for installation is calculated as follows: • Upstream straight pipe section: 5 × 200mm=1000mm • Downstream straight pipe section: 2 × 200mm=400mm. This means that at least 1 meter of straight pipe needs to be left at the front end of the flowmeter installation; At its rear end, a straight pipe at least 0.4 meters long is required. After understanding the basic requirements, it is also important to note that ac
2. Where should the plug-in electromagnetic flowmeter be installed in the pipeline?
The plug-in electromagnetic flowmeter should be installed first in the vertical section of the pipeline (where the fluid flows from bottom to top), followed by the horizontal section that meets the requirements of a full pipeline. It is necessary to avoid local resistance components, strong electromagnetic interference sources, and areas with severe vibration and noise in the pipeline.
1. Detailed rules for core installation location:
Priority should be given to using vertical pipeline sections where the fluid flows from bottom to top, ensuring that the electrode is completely immersed in the fluid and avoiding the deposition of medium impurities on the electrode surface. At the same time, the risk of air pockets and beam accumulation should be eliminated to ensure measurement accuracy. If only horizontal installation can be used on site, it is necessary to ensure that the opening position is selected at the center height of the pipeline sidewall, the sensor electrode axis is in the same horizontal plane, and the fluid inside the pipeline is completely filled to avoid gas accumulation at the top and impurities deposition at the bottom covering the electrode.
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