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Flow Meter for Viscous Fluid Applications: Handling High-Viscosity Liquids with Coriolis Sensors
Quick Answer: For high viscosity liquids above 100 cP, a Coriolis mass flow meter is usually the best technical choice. The meter measures mass flow directly and does not depend on Reynolds number or flow profile. Send your fluid viscosity in cP, pipe size DN, flow range in kg/h, pressure in bar, and temperature in °C to Silver Automation Instruments for a direct model recommendation.
Why Standard Flow Meters Struggle with High Viscosity Liquids
Many process plants still try turbine, electromagnetic, or ultrasonic meters on heavy fuel oil, molasses, paint resin, and polymer solution. In practice, these meters often fail or lose accuracy. Turbine meters need a stable turbulent flow. Because high viscosity fluids create laminar flow, the rotor can stick and drag. Electromagnetic meters need a conductive liquid. Many viscous oils, resins, and syrups have conductivity below 5 µS/cm. An electromagnetic meter will not read these fluids. Ultrasonic meters can work with clean liquids but lose signal when the fluid has high attenuation or solid particles.
A paint manufacturer in Vietnam ran a turbine meter on alkyd resin at 7000 cP. The rotor stopped after three months. We have seen the same failure on customer sites many times. The problem was not the meter brand. The problem was the wrong measurement principle for the fluid condition.
What Makes Coriolis Sensors Different for Viscous Fluids
Coriolis mass flow meters measure mass flow directly. The sensor vibrates two tubes and detects phase shift caused by mass flow. The measurement principle does not depend on Reynolds number, flow profile, or fluid conductivity. A Coriolis meter works from water at 1 cP to heavy syrup at 50000 cP with the same sensor technology.
There are no moving parts in the flow stream. That means no rotor, no gears, and no bearing replacement. The wetted parts are typically 316L stainless steel or Hastelloy C22. The meter also measures density and process temperature as secondary outputs. A built in PT100 temperature sensor reports the process temperature. Density data is useful for batch quality checks and concentration monitoring.
Silver Instruments supplies the SIL-CMF Coriolis mass flow meter series in DN15 to DN150 line sizes. Standard mass flow accuracy is 0.1 to 0.2 percent of rate. Typical flow coverage is 0.5 kg/h on a DN15 meter up to 300000 kg/h on a DN100 or DN150 meter. That range covers small chemical dosing skids and large truck loading systems.
Key Parameters for High Viscosity Flow Meter Selection
Here is the thing. Do not select a meter on line size alone. Most engineers skip this part and then face high pressure drop. For high viscosity service, you need to check five parameters.
Fluid viscosity in cP or mPa.s. Fluid flow range in kg/h or L/h. Pipe size DN. Operating pressure in bar. Operating temperature in °C. Send us these values and we will check pressure drop across the meter. A Coriolis meter creates a small pressure drop. But for molasses at 12000 cP, a DN25 meter may be too restrictive. The correct choice may be DN50 or DN80.
Our standard Coriolis meters operate from -50 °C to 200 °C and up to 100 bar pressure. Output options include 4-20 mA HART, pulse, and RS485 Modbus RTU. Hazardous area versions are available for ATEX Zone 1 and Zone 2. The product range suits oil and gas terminals, chemical plants, and paint factories.
Recommended Model Match for Common Viscous Fluids
Here are four examples from real customer inquiries. We use the examples to show how line size and flow range change with viscosity.
For resin dosing at 5000 cP and 10 to 80 kg/h, use the SIL-CMF-015 with DN15 and 316L tubes. The small bore keeps velocity high enough to avoid coating and air pockets.
For palm oil transfer at 100 cP and 2000 to 20000 kg/h, use the SIL-CMF-040 with DN40. For molasses truck loading at 12000 cP and 8000 to 3
For heavy fuel oil at 350 cP and 5000 to 50000 kg/h, use the SIL-CMF-050 with DN50 at 80 °C. A user in Chile runs a DN50 SIL-CMF-050 with 4-20 mA HART into a PLC. The meter has worked without cleaning for more than two years.
Installation Tips for High Viscosity Service
Coriolis meters do not need long straight pipe runs. The short straight run requirement matters a lot for skids and congested pump rooms. But high viscosity fluids bring their own installation rules.
Keep the meter heated if the fluid can solidify or climb above 1000 cP at room temperature. Use heat tracing, steam tracing, or specify a jacketed sensor. Install the meter in a vertical pipe with flow going upward if you have frequent product changes. Upward flow helps drain and reduces residue buildup. Before shutdown, flush the meter with solvent, hot water, or a compatible light oil. Do not leave viscous product inside the tubes.
Perform zero calibration at operating pressure and temperature. A small zero shift changes mass flow readings more on low flow dosing applications. Recheck zero after installation and after high temperature cycles.
Customer Site Results
Here are three direct examples.
A molasses terminal in Thailand uses a DN80 Coriolis meter to load trucks at 12000 cP. The meter records total mass in kg and sends pulse output to a batch controller. Before the Coriolis meter was installed, the terminal used a positive displacement meter that needed bearing replacement every 6 months.
A wastewater polymer plant in Saudi Arabia doses 5000 cP polymer at 0 to 120 kg/h with a DN15 Coriolis meter. The plant measures mass flow and density. That data confirms the polymer concentration before injection.
A paint factory in Indonesia replaced a gear meter on solvent resin at 8000 cP with a DN25 Coriolis meter. The main gain was zero bypass piping and no rotor wear. The plant now tracks batch totals directly in kg.
Five Frequently Asked Questions
Question 1: Can a Coriolis flow meter handle molasses or heavy syrup?
Yes. Select a full bore meter with 316L stainless steel tubes and keep the temperature above the fluid pour point. For molasses at 10000 to 15000 cP, use DN40 to DN80.
Question 2: What is the minimum viscosity for a Coriolis meter?
There is no minimum viscosity limit. Coriolis meters measure liquids, gases, and slurries. High viscosity only matters for pressure drop and line sizing.
Question 3: Do I need straight pipe upstream?
No. Coriolis meters do not require long straight runs. The installation uses less space in pump skids, filling machines, and transfer lines.
Question 4: Can one meter cover both low flow and high flow?
Yes in most cases. A DN15 meter covers about 0.5 kg/h to 150 kg/h. A DN80 meter covers about 1000 kg/h to 60000 kg/h. Give us your minimum and maximum flow and we will check turndown.
Question 5: What data should I send for a quote?
Send fluid name, viscosity in cP, flow range in kg/h or L/h, pipe size DN, pressure in bar, temperature in °C, and hazardous area need. We will reply with a model number, price, and lead time.
Direct Contact and Next Step
Silver Automation Instruments is an industrial flow meter manufacturer and supplier for water, oil, gas, chemical, and food processing plants across Southeast Asia, Oceania, Latin America, Africa, and the Middle East.
You can contact Silver Automation Instruments by telephone or mobile app. Tel: +86-25-68650347. Whatsapp: +86-25-52155837. WeChat: +86 15365082610. You can also find product pages at flow-meter.com.au.
Send us your pressure in bar, temperature in °C, pipe size DN, and flow range. Include the fluid viscosity in cP. We will specify a Coriolis mass flow meter or an oval gear flow meter if the oval gear type fits your case better.
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