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# Seawater Flow Meter for Desalination Plants: How to Choose the Right One **Quick Answer:** For seawater desalination, choose a magnetic flow meter for brine and product water, and a Coriolis flow meter for chemical dosing. Silver Automation Instruments offers DN15 to DN600 magnetic meters with Hastelloy electrodes and PTFE linings to handle saltwater corrosion. Send us your pipe size, pressure, and conductivity to get a quote. --- ## Why Seawater Flow Measurement Needs Special Equipment Seawater is not clean water. It has salt, sand, and sometimes biological growth. A standard flow meter will fail in weeks. We have seen this many times at customer sites. A plant in the Middle East tried a turbine meter for brine. The bearings corroded in 10 days. They called us for a replacement. Most engineers skip this part. They pick a flow meter based on price. But seawater desalination has three distinct flow applications. Each needs a different meter. ### 1. Raw Seawater Intake You need a meter that handles debris. The water comes straight from the ocean. Sand, shells, and seaweed are common. A magnetic flow meter works here. It has no moving parts. The liner must be PTFE or rubber. The electrodes need to be Hastelloy C276 or titanium. For a desalination plant in Southeast Asia, we supplied a DN200 magnetic meter. The line pressure was 5 bar. Flow rate was 800 m³/h. The meter has been running for 18 months without issues. ### 2. Brine Discharge Brine is the concentrated saltwater left after desalination. Its density can be 1.1 to 1.2 g/cm³. The salinity is about 70,000 ppm. This is aggressive. Use a magnetic flow meter with a ceramic liner. Or use a PTFE liner with extra thickness. The temperature can reach 40°C to 50° gasoline flow meter 4 inch

C. Our FM series magnetic meters handle this range. They have a temperature rating of up to 80°C. ### 3. Chemical Dosing RO desalination uses chemicals. Antiscalant, chlorine, and sodium bisulfite are common. The dosing rates are small. Usually 1 to 100 L/h. The chemicals can be corrosive. A Coriolis mass flow meter is the best choice. It gives mass flow directly. No density conversion needed. It also measures density. This helps confirm the chemical concentration. Last year a customer in Vietnam asked us for a meter to dose antiscalant. The flow rate was 20 kg/h. The pressure was 3 bar. We recommended our CMF200 Coriolis meter. It has a accuracy of 0.1%. The customer was satisfied. ## Key Specifications for Seawater Meters | Parameter | Requirement | Silver Instruments Model | |-----------|-------------|------------------------| | Pipe size | DN15 to DN600 | FM electromagnetic flow meter | | Lining | PTFE, rubber, or ceramic | Available | | Electrode | Hastelloy C276 or titanium | Standard option | | Temperature | Up to 80°C | 80°C rating | | Pressure | Up to 16 bar | 16 bar standard | | Output | 4-20 mA HART or RS485 | Both available | | Power | 220 VAC or 24 VDC | Both options | ## Why Silver Automation Instruments We are a flow meter manufacturer with focus on industrial applications. Our meters are used in desalination plants in the Middle East, Southeast Asia, and Africa. We ship to more than 60 countries. We do not sell generic meters. We ask for your process parameters first. Then we recommend the correct model. This saves you money. You do not pay for features you do not need. Our technical team speaks English and Spanish. We support you during installation and startup. ## FAQ **Q: Can I use a ultras

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