heavy fuel oil flow meter DN50

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# What Is a Seawater Flow Meter for Desalination Plants? Complete Guide **Quick Answer:** A seawater flow meter for desalination plants must handle high salinity, biofouling, and abrasive particles. We recommend electromagnetic flow meters for reverse osmosis feed lines and ultrasonic meters for high-pressure brine streams. For most seawater applications, a mag meter with PTFE liner and Hastelloy electrodes works reliably. ## Why Seawater Flow Measurement Is Different Saltwater is not like freshwater or clean process liquids. Seawater contains 35,000 ppm dissolved salts, sand particles, marine organisms, and chlorides. A standard flow meter corrodes within weeks. When a customer in Saudi Arabia installed a regular stainless steel meter on their SWRO intake line last year, the electrodes failed in 42 days. We replaced it with a mag meter having Hastelloy C276 electrodes. That unit has run for 14 months without issues. Most engineers skip this part: the electrical conductivity of seawater is around 50,000 µS/cm. That is thousands of times higher than drinking water. For electromagnetic flow meters, this high conductivity creates excellent signal strength. But it also accelerates galvanic corrosion if you choose wrong wetted materials. ## Best Flow Meter Types for Seawater Desalination ### Electromagnetic Flow Meters (Mag Meters) Mag meters are the first choice for seawater desalination. They handle the high conductivity well. They have no moving parts. They do not create pressure drop. They measure forward and reverse flow. For desalination plants, we supply the in-line mag meter with: - PTFE or PFA liner (resists chemical attack) - Hastelloy C276 or titanium electrodes (resists chloride pitting) - IP68 submersible heavy fuel oil flow meter DN50

enclosure for outdoor installation - 4-20 mA HART for integration with DCS **Specific application:** Intake seawater at 15-30°C, flow rate of 1500 m³/h, pipe size DN500. Our mag meter model SA-EM3000 has been used at a desalination plant in Dubai for 8 months. The plant produces 50,000 m³ of fresh water per day. ### Ultrasonic Flow Meters For high-pressure brine reject streams, clamp-on ultrasonic meters work well. They install on the outside of the pipe. They do not need to contact the brine. This avoids corrosion problems entirely. **Real scenario:** A desalination plant in Chile measures brine reject from their RO membranes at 65 bar, DN150 pipe. They use our SA-UT1000 portable ultrasonic meter. The sensor clamps onto the existing pipe. No process shutdown needed for installation. Accuracy is ±1.0% of reading. ### Coriolis Mass Flow Meters For chemical dosing lines, Coriolis meters give direct mass flow measurement. They work for anti-scalant, sodium bisulfite, and chlorine dosing. The mass flow reading does not change with temperature or density variations. A customer in Oman doses anti-scalant at 50 L/h. They use our SA-CM2000 Coriolis meter. The meter has 0.1% accuracy for dosing control. The DN10 meter connects to a 1/2 inch pipe. ## Critical Parameters When Selecting a Seawater Flow Meter **Pressure:** Desalination plants use high-pressure RO pumps operating at 55-85 bar. The flow meter must handle this pressure. Our mag meters come with pressure ratings up to 100 bar. **Temperature:** Seawater intake is typically 5-35°C. Brine reject can be hotter at 25-45°C. Standard meters with EPDM or PTFE liners work in this range. **Pipe size:** Most desalination plants have pipe sizes from DN15 for chemical dos

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