Help: Selection of flow meter
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Pipe diameter DN50, flow rate 50 liters/h, 7 m/s, output 4-20mA; medium: liquid carbon disulfide, non-conductive. Carbon disulfide liquid crystallizes at low temperatures; crystallization generally occurs within 2-3 days. The vortex flowmeters currently in use have very large measurement errors; there is no reference price for them, and electromagnetic flowmeters cannot be used either. I’m seeking advice from experts on recommended solutions or suitable flowmeters; thank you! :):):)
If it’s in liquid form, ultrasound could be considered
If it’s in liquid form, ultrasound could be considered
In this case, a vortex flow meter is not suitable, as the flow obstructing element tends to stick to the medium, affecting the formation of vortices and thus preventing accurate measurement； You can try using a wedge-shaped throttle element to measure the flow rate or to perform purging. Crystallization is eliminated by flushing or heating at intervals.
Without solving the crystallization problem, no flow meter will work properly. Therefore, the flow meter should be equipped with insulation and heating; as long as crystallization does not occur, vortex flow meters should work fine.
Crystallization can occur inside the pipes, and that is a process-related issue. To resolve this problem, instruments are not sufficient; external measurements are required
It is in a liquid state under normal operating conditions, but it tends to crystallize at low temperatures during operation.
Thank you! The vortex flow meters currently in use are indeed prone to being affected by viscous media, which impacts the measurement accuracy. Flushing or heating at intervals is possible, but it requires that the flow meter be easy to remove for cleaning.
It is generally not recommended to remove it for cleaning frequently; doing so is inconvenient and not very safe. How long does it usually take before crystallization occurs? At what temperature does it disappear after crystallization?
Generally, crystallization occurs within 3-4 days; once crystallization takes place, the crystals disappear when the temperature rises. However, the temperature at the site does not rise, and the pipes there as well as the flow rates are frequently disconnected, so it is not possible to insulate the pipes.
Regarding the crystallization issue, just blowing air isn’t enough; either it needs to be taken apart and cleaned, or heat tracing is required. You may want to learn more about our fully jacketed vortex flowmeters; they have been in use in the acid gas treatment system of Jinling Petrochemical’s sulfur recovery unit for two years without any need for maintenance, and they can effectively solve the problem of crystalline condensates. Jiangsu Weiyi: 13861537360, you can give it a try.