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Magnetic Flow Meters represent about 24% of all flow meters sold today. Applications for dirty liquids are found in the water, wastewater, mining, mineral processing, power, pulp and paper, and chemical industries. Water and wastewater applications include custody transfer of liquids in force mains between water/wastewater districts. Magnetic flow meters are used in water treatment plants to measure treated and untreated sewage, process water, water, and chemicals. Mining and mineral process industry applications include process water and process slurry flows and heavy media flows.
With proper attention to materials of construction, the flow of highly corrosive liquids (such as acid and caustic) and abrasive slurries can be measured. Corrosive liquid applications are commonly found in chemical industry processes and in chemical feed systems used in most industries. Slurry applications are commonly found in the mining, mineral processing, pulp and paper, and wastewater industries.
Magnetic flow meters are often used where the liquid is fed using gravity.Be sure that the orientation of the flow meter is such that the flow meter is completely filled with liquid. Failure to ensure that the flow meter is completely filled with liquid can significantly affect the flow measurement.
Use caution when operating magnetic flow meters in vacuum service because some magnetic flow meter liners can collapse and be sucked into the pipeline in vacuum service, catastrophically damaging the flow meter. Note that vacuum conditions can occur in pipes that seemingly are not exposed to vacuum service such as pipes in which a gas can condense (often under abnormal conditions). Similarly, an excessive temperature in magnetic flow meters (even briefly under abnormal conditions) can result in permanent flow meter damage.
The construction of the magnetic flow meter is such that the only wet parts are the liner and electrodes, both of which can be made from materials that can withstand corrosion.In addition, the straight-through (obstruction-less) nature of the design reduces the loss of hydraulic energy across the flow meter (pressure drop) and the potential for abrasion from the flowing liquid. Therefore, magnetic flow meters can measure many corrosive liquids and abrasive slurries. Magnetic flow meter liners and electrodes can be constructed of materials that do not contaminate the liquid. Therefore, these flow meters can be applied when liquid contamination is an issue, such as in sanitary applications.
For slurry service, be sure to size magnetic flow meters to operate above the velocity at which solids settle (typically 1.5 / 2 ft/sec), in order to avoid filling the pipe with solids that can affect the measurement and potentially stop the flow.Magnetic flow meters for abrasive service are usually sized to operate at low velocity (typically below 5 / 6 ft/sec) to reduce wear. In abrasive slurry service, the flow meter should be operated above the velocity at which solids will settle, despite increased wear. These issues may change the range of the flow meter, so its size may be different than the size for an equivalent flow of clean water.
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