heavy fuel oil flow meter DN100

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# Seawater Flow Meter for Desalination Plants: How to Select the Right One **Quick Answer:** For seawater desalination, choose a magnetic flow meter (electromagnetic) or a Coriolis mass flow meter. Magnetic meters handle high conductivity seawater and large pipe sizes (DN80 to DN600). Coriolis meters give you mass flow and density readings for chemical dosing. Both work with 4-20 mA HART output. Send us your pressure (bar), temperature (°C), pipe size (DN), and flow range for a quote. --- ## Why Most Standard Flow Meters Fail in Seawater Applications Seawater is not like fresh water. It has high conductivity, around 50 µS/cm. It contains salts, chlorides, and suspended solids. Most mechanical flow meters with moving parts, like oval gear or turbine meters, get clogged or corroded within months. We saw this last year at a desalination plant in Oman. They used a turbine meter for brine flow. After 90 days, the rotor stopped turning because of salt crystallization. The best options are electromagnetic flow meters and Coriolis mass flow meters. Both have no moving parts. No seals. No bearings. They do not touch the fluid directly. ## Electromagnetic Flow Meters for Seawater Magnetic flow meters work on Faraday’s law of induction. Seawater is conductive, so it generates a voltage when it moves through a magnetic field. The meter reads that voltage and gives you a flow rate. **Key parameters for seawater:** - Minimum conductivity: 20 µS/cm. Seawater is 50 µS/cm, so it works. - Lining material: PTFE or PFA. These resist chloride corrosion. - Electrode material: Hastelloy C-276 or titanium. Standard stainless steel 316L corrodes fast in seawater. **Recommended model from Silver Instruments:** The **SIL-MAG series**. We heavy fuel oil flow meter DN100

have installed these in a reverse osmosis plant in Saudi Arabia. Pipe size was DN150. Flow range was 0.3 to 12 m/s. Accuracy was ±0.5% of reading. They ran for 18 months without any maintenance. **Tip:** If you need battery power, we have a version with lithium battery. It lasts 3 years at 1 reading per minute. ## Coriolis Mass Flow Meters for Chemical Dosing In desalination, you dose chemicals for antiscalant, anti-foam, and chlorine. Coriolis meters measure mass flow and density directly. They are not affected by temperature or viscosity changes. **Common dosing rates:** A paint manufacturer in Southeast Asia asked us for a 0 to 200 kg/h Coriolis meter for antiscalant injection. Their pipe size was DN15. We supplied the **SIL-CMF series** with DN15 body. Accuracy was ±0.1% of rate. They have been running for 2 years now. Coriolis meters also handle high viscosity fluids. If you dose polymers (up to 1000 cP), this is the best choice. ## Ultrasonic Flow Meters: Are They Suitable? Clamp-on ultrasonic meters are non-invasive. You mount them on the outside of the pipe. No contact with seawater. No corrosion inside the meter. **The problem:** Ultrasonic meters need clean fluid for accuracy. Seawater has bubbles and suspended particles. In practice, we have seen errors up to 5% in desalination plants. A customer in Qatar used a clamp-on meter for seawater feed. The accuracy was ±3% in the first week. After 2 weeks, it dropped to ±8% because of biofilm on the pipe wall. **Use ultrasonic only if:** You need temporary measurement or cannot cut the pipe. For permanent installation, use magnetic or Coriolis. ## Pressure and Temperature Ratings Seawater temperatures in desalination plants range from 25 to 45 °C. Pressur

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