crude oil flow meter DN15

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# How to Choose a Seawater Flow Meter for Your Desalination Plant **Quick Answer:** For seawater desalination, you need a flow meter that handles high salinity, biofouling, and pressure up to 10 bar. The best options are electromagnetic flow meters for conductivity above 5 µS/cm, or ultrasonic flow meters for large pipe sizes DN200 and above. Send us your pipe size (DN), pressure (bar), and flow range (m³/h) for a specific recommendation. ## Why Seawater Is Hard on Flow Meters Seawater is not like clean water. It has salt content around 35,000 ppm. It conducts electricity. It grows biofouling on sensor surfaces. It can reach temperatures of 40°C in Middle East desalination plants. Most engineers skip this part. They pick a flow meter based only on pipe size and flow range. Then six months later, the electrodes are coated with marine growth. The reading drifts. The plant loses production. We have seen this on customer sites many times. Last year a customer in Oman asked us to replace a turbine flow meter on a seawater intake line. The rotor was jammed with barnacles after just three months. They switched to an electromagnetic flow meter with Hastelloy electrodes. No moving parts. Problem solved. ## Which Flow Meter Types Work for Seawater ### Electromagnetic Flow Meters (Best for Most Seawater Applications) Electromagnetic flow meters are the first choice for seawater. Here is why: Seawater has conductivity above 5 µS/cm. Most electromagnetic flow meters need minimum 5 µS/cm. Seawater typically ranges from 40,000 to 55,000 µS/cm. So it works perfectly. The flow meter has no moving parts. The fluid touches only the liner and the electrodes. For seawater, you need: - Liner: PTFE or PFA. Hard rubber works too but c crude oil flow meter DN15

heck temperature rating. - Electrodes: Hastelloy C-276 or titanium. Standard stainless steel 316L corrodes in seawater within weeks. - Grounding rings: Required. Use the same material as electrodes. Our Silver Instruments SE series electromagnetic flow meter handles seawater at DN15 to DN1000. Accuracy is ±0.5% of reading. Output is 4-20 mA HART or pulse. ATEX Zone 1 option available for offshore platforms. A paint manufacturer in Southeast Asia uses our SE series on their seawater cooling lines. They run 24/7 at 30°C. The flow meters have been in service for 4 years without calibration drift. ### Ultrasonic Flow Meters (Best for Large Pipes or Retrofit) Ultrasonic flow meters work for seawater when you cannot cut the pipe. Clamp-on models attach to the outside. No contact with the seawater. No biofouling problem. But there are limitations: - Pipe wall material and thickness affect accuracy. You need clean pipe surface. - Air bubbles in seawater cause signal loss. In desalination, air can enter from the intake. - Accuracy is ±1% to ±2% of reading. Not as good as electromagnetic. For pipes DN200 and above, ultrasonic is cost effective. For pipes under DN80, stick with electromagnetic. A rubber hose manufacturer in Malaysia uses our clamp-on ultrasonic meter on a DN300 seawater return line. They needed to verify flow without shutting down the plant. The meter installed in 2 hours. Accuracy was within 1.5% compared to their existing electromagnetic meter. ### Thermal Mass Flow Meters (Not for Seawater) Do not use thermal mass flow meters for seawater. They measure mass flow based on heat transfer. Seawater has varying salt content. Salt changes the specific heat capacity. The reading will be wrong. ### Oval Gear F

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