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Coriolis Flow Meter: High-Viscosity Fluid Handling and Slurry Line Optimization Steps
Quick Answer: Silver Instruments Coriolis mass flow meters measure high-viscosity fluids up to 100 000 cP directly by mass, not volume. Correct installation with vertical pipe runs and zero calibration avoids the most common slurry line issues. Choose a full-bore design for slurries with solids up to 0.5 mm to prevent clogging.
Why High-Viscosity Fluids Demand Direct Mass Measurement
Positive displacement and turbine meters slip when viscosity goes above 500 cP. Coriolis meters have no moving parts in the flow stream. They measure mass directly. This eliminates the need to compensate for temperature or density shifts. In a heavy fuel oil transfer at a power plant in Vietnam, a dual-tube Coriolis meter delivered repeatability within 0.1 percent at 850 cP and 120 deg C. The same meter handled bunker fuel without recalibration.
Slurry Lines: The Real Challenge for Flow Meters
Slurries carry abrasive solids. They settle when flow stops. They coat sensor walls. In a mining application in Peru, a copper concentrate slurry with 30 percent solids caused frequent blockages in a conventional magnetic flow meter. The electrodes collected sediment. The signal dropped. We recommended a straight-tube Coriolis meter with Hastelloy C-22 wetted parts. The meter runs at a 2 m/s velocity to keep solids suspended. No liner is needed because the tube wall does not require grounding rings.
Optimization Steps for Slurry and High-Viscosity Lines
Step 1: Size the meter for minimum pressure loss. You need the fluid to stay above its pour point. For a polymer melt at 2000 cP, a DN25 meter with a 0.5 bar differential keeps the flow stable. Check pressure, temperature, and pipe size before selecting.
Step 2: Install the meter in a vertical upward flow line. This ensures the pipe stays full during pump stops. Slurry will not settle inside the tubes when the meter is vertical. A chemical plant in Thailand verified this setup after replacing three horizontal meters that failed from solids buildup.
Step 3: Perform zero calibration under process conditions. Fill the meter with the actual fluid at oper
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Step 4: Set the excitation current high enough to drive thick fluids. For viscosity above 5000 cP, you may need to increase drive power. Ask the manufacturer for the drive gain monitoring parameter. We have seen installations where low drive gain caused signal dropout during cold starts.
Step 5: Clean-in-place (CIP) compatibility. For food and beverage slurries, a Coriolis meter with polished 316L tubes and no crevices handles CIP at 85 deg C. The same line runs tomato paste at 1200 cP in a Middle Eastern food processor.
Frequently Asked Questions
1. Can a Coriolis flow meter handle crude oil with 10 000 cP viscosity?
Yes. Silver Instruments meters operate up to 100 000 cP without calibration changes. Provide your normal viscosity and temperature range to confirm.
2. What is the maximum solid particle size for slurry measurement?
Full-bore meters pass particles up to 0.5 mm safely. For larger solids, use a reduced-bore design with a strainer upstream.
3. Do I need a straight pipe run for high-viscosity fluids?
No. Coriolis meters are insensitive to velocity profile distortion. A short 3D upstream and 2D downstream is enough for mounting convenience. The meter measures mass flow, not velocity.
4. How to prevent air entrainment in thick fluids?
Install a back-pressure valve downstream. Keep the meter tube full. Use a vertical installation with flow going up. Degassing before the meter may be required for adhesives.
5. What output signals work best for plant integration?
We recommend 4-20 mA HART plus a pulse output for totalization. Modbus RTU is available for direct connection to SCADA or PLC. All meters carry ATEX Zone 1 certification for gas or dust.
Send us your pressure (bar), temperature (deg C), pipe size (DN), flow range (kg/h) and normal viscosity (cP). We will return a meter sizing sheet within 24 hours.
Email: [email protected]
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