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Coriolis Flow Meter Sizing Calculation: Matching Process Mediums to Tube Sizers
Quick Answer: Coriolis flow meter sizing starts with mass flow rate and process density. You cannot pick a tube size from pipe diameter alone. The process medium decides the tube sizer. Send us your flow range in kg/h, density in kg/m3, viscosity in cP, pressure in bar, and temperature in °C. We will propose a Silver Instruments meter that matches your process.
Start With Mass Flow Rate. Not Pipe Size
Many engineers size a Coriolis meter the same way they size a magnetic flow meter. That is a mistake. Coriolis meters measure mass directly. The tube sizer depends on mass flow, density, and pressure drop. A DN15 pipe does not always mean a DN15 Coriolis sensor. A small tube can handle a high mass flow if the fluid is dense. A large tube can be wrong for low flow gas or light solvent.
In practice, we ask for flow range first. A chemical dosing line in Malaysia may run from 30 kg/h to 400 kg/h. A fuel oil transfer line in Mexico may run from 8000 kg/h to 60000 kg/h. These two jobs need different tube sizes. The same logic applies to a food grade water line. You cannot select a DN40 meter just because the pipe is DN40.
Matching Process Mediums to Tube Sizers
The tube sizer is the internal flow path of the Coriolis sensor. Silver Automation Instruments offers standard tube sizes from DN3 to DN150. A DN3 or DN8 tube works for low flow dosing from 0.5 kg/h to 100 kg/h. A DN15 tube works for 50 kg/h to 6500 kg/h for water. A DN25 tube works for 1000 kg/h to 18000 kg/h. A DN50 tube works for 5000 kg/h to 90000 kg/h. These ranges are guidelines. The exact number changes with density and pressure drop.
Say you measure palm oil at 40°C. Density is about 900 kg/m3. Viscosity can be 30 cP to 70 cP. If the flow rate is 3000 kg/h, a DN15 tube may work but pressure drop could be high. A DN25 tube may be better. The larger tube reduces pressure drop and lowers shear. This matters for shear sensitive fluids.
Density Changes the Calculation
Mass flow rate is the main input. But density changes the pressure drop across the tube. A gas at 10 bar has much lower density than water. At the same mass flow, gas velocity is higher. Pressure drop can be higher than expected. So a larger tube may be needed for gas even if the kg/h number looks small.
For example, a gas flow of 500 kg/h at 12 bar in a chemical plant may need a DN25 tube. The same 500 kg/h of water passes easily through a DN15 tube. We have seen this on customer sites many times. Engineers send a flow rate but forget density. Then the meter arrives and pressure drop is too high.
Viscosity and Flow Profile
Viscosity affects selection more than most people expect. Coriolis meters work well with high viscosity fluids. But higher viscosity means higher pressure drop. For glucose syrup at 2000 cP, a DN20 or DN25 tube often fits better than a DN15 tube. For heavy fuel oil at 380 cP and 70000 kg/h, a DN50 or DN80 tube may be needed.
Most engineers skip this part. They use line size only. Then they call us when the pressure transmitter shows a larger drop than expected. Send us viscosity in cP with your inquiry. This one number changes the tube recommendation fast.
Temperature and Pressure Limits
Coriolis meters have process temperature limits. Standard Silver Instr
Pressure rating also matters. A meter with a 40 bar rating is common. A high pressure option with 100 bar or 220 bar may be needed for oil and gas injection lines. The tube geometry changes with pressure rating. Do not assume PN16 is enough. Confirm the actual operating pressure first.
Industry Examples from Our Sizing Queries
A paint manufacturer in Southeast Asia asked us for a Coriolis flow meter to measure solvent at 25 kg/h to 180 kg/h. The solvent density was 790 kg/m3. Viscosity was below 5 cP. We proposed a DN8 tube with stainless steel wetted parts. Pressure drop stayed under 0.6 bar. The meter has been running for eight months without drift.
Last year a customer in Vietnam asked for a meter on a diesel generator test bench. The flow range was 4000 kg/h to 25000 kg/h. Diesel density was 830 kg/m3. We selected a DN25 tube rather than a DN15. This kept the pressure drop below 1 bar. The customer used the pulse output for a PLC totalizer.
A desalination plant in Saudi Arabia needed to measure brine reject at 120000 kg/h. The brine density was 1030 kg/m3. A DN80 tube was selected. The line size was DN100. Here the meter size was smaller than the pipe. This is common for liquids with moderate viscosity.
Recommended Sizing Checklist
Send us these process data points and we will return a sizing calculation within one working day.
Mass flow range in kg/h or t/h. Fluid name and density in kg/m3. Operating viscosity in cP. Operating pressure in bar. Process temperature in °C. Pipe size and connection type. Hazardous area requirement, for example ATEX Zone 1 or IECEx. Output preference, for example 4-20 mA HART, Modbus RTU, or pulse.
Silver Automation Instruments is a Coriolis flow meter manufacturer and supplier. The sensor includes a PT100 temperature element for density correction. Send us your pressure in bar, temperature in °C, pipe size in DN, and flow range in kg/h. Call +86-25-68650347 or message us on WhatsApp at +86-25-52155837. You can also add WeChat at +86 15365082610. Find technical data at flow-meter.com.au.
FAQ: Coriolis Flow Meter Sizing
What is the first data point for Coriolis sizing?
Mass flow rate in kg/h. You also need density and viscosity. Pipe size alone is not enough.
Can I use line size for the meter?
Sometimes. A Coriolis meter may be one size smaller than the pipe. This keeps flow velocity high enough for accurate measurement. You must still check pressure drop.
How does viscosity affect the tube sizer?
High viscosity raises pressure drop. A larger tube size can reduce pressure drop. For fluids above 500 cP, we often select one size up from the liquid mass flow guideline.
What output do you recommend?
4-20 mA HART is the most common for flow and density. Modbus RTU works well for multi variable data. Pulse output fits totalizer applications.
Do you provide sizing calculations for free?
Yes. Send us your flow range, pressure, temperature, density, and pipe size. We return a tube sizer recommendation and price. Contact Silver Automation Instruments at +86-25-68650347.