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Tung Oil Flow Meter for Industrial Paint Processing Controls
Quick Answer: For tung oil metering in paint and coatings production, oval gear flow meters and Coriolis mass flow meters are the best choices. An oval gear meter handles high viscosity up to 2000 cP with ±0.5% accuracy and costs less. A Coriolis meter gives ±0.2% mass flow accuracy and works regardless of viscosity swings. Silver Automation Instruments supplies both types with 4-20 mA HART, pulse output, and ATEX approvals. Share your pressure (bar), temperature (°C), pipe size (DN), and flow range to get a specific quote for your process.
Why Tung Oil Flow Measurement Matters in Paint Production
Industrial paint plants use tung oil as a key binder in alkyd resins, varnishes, and marine coatings. Batch consistency depends on the exact volume or mass of tung oil added to the reactor. A dosing mistake of only 2 percent can ruin a full batch worth thousands of dollars. So engineers need a flow meter that does not drift and can handle sticky high viscosity media. In many plants in Southeast Asia, Africa, and the Middle East, we see projects moving from manual drum weighing to inline flow control. An accurate flow meter shortens cycle time and reduces solvent wash waste.
The Viscosity Challenge with Tung Oil
Tung oil is not like water or diesel. Its dynamic viscosity often sits between 200 and 800 cP at 25 degrees Celsius. It can climb higher if the plant is cold in winter or if the oil has aged. Standard turbine meters fail quickly here because the thick fluid clogs the bearing and destroys the rotor. We have seen this on customer sites many times. A dairy vortex meter also struggles at low flow conditions. Even some magnetic flow meters cannot work because tung oil is non-conductive. So the meter type must match the fluid properties.
Oval Gear Flow Meter: The Workhorse for Tung Oil
Silver Automation Instruments recommends the SOG oval gear flow meter series for most mid-range paint batching applications. The meter uses two precision oval rotors that trap a fixed volume of fluid per rotation. Because the measurement is volumetric, it ignores small changes in conductivity or dielectric constant. We supply sizes from DN10 to DN80 with process connections in ANSI or DIN flanges. Accuracy is typically plus or minus 0.5 percent of reading, repeatability within 0.1 percent. The wetted parts are 316L stainless steel with PTFE or PEEK bearings, suitable for tung oil and mild solvents. A built-in PT100 sensor can output fluid temperature as a 4-20 mA signal, which helps the PLC compensate for volume expansion if needed. For plants that handle flammable solvents or operate in Zone 1 areas, we offer ATEX Ex ia IIC T4 certified oval gear meters.
Coriolis Mass Flow Meter: When Batch Accuracy Is Non-Negotiable
Some coating manufacturers produce high solids urethane or UV cured finishes where binder weight must be exact to 0.2 percent. In that case, a Coriolis mass flow meter is the right tool. Our SCF series Coriolis meter measures mass flow directly, independent of viscosity, density, or temperature changes. The meter also outputs density and temperature data in real time. The accuracy is plus or minus 0.2 percent for liquids, with a turndown ratio better than 20:1. This means a single DN15 Coriolis meter can handle a batch start at 3 kg/h and ramp to 600 kg/h without switching lines. The explosion proof version carries ATEX Zone 1 certification. While the price is higher than an oval gear meter, a Coriolis unit eliminates any conversion uncertainty and pays back quickly in premium paint production.
Installation Advice and ATEX Requirements
Tung oil can have tiny gum particles that collect in meter chambers. Always install a Y strainer or basket strainer upstream, 100 micron mesh is a good starting point. Mount the flow meter with no bypass line if possible. In practice, most engineers skip the temperature compensation step for oval gear meters when batching by volume, but we suggest using the PT100 feedback if the ambient temperature shifts more than 10 degrees C during a shift. For hazardous area w
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Customer Example: Vietnam Paint Maker Fixes Batching Drift
Last year, a paint factory near Ho Chi Minh City contacted us. They were using a small turbine flow meter to dose tung oil into alkyd resin batches. The turbine would seize every two weeks because the oil was viscous and contained some natural resin. The batch weight drifted by plus or minus 5 percent, causing color mismatch in the final paint. We replaced the turbine with an SOG-DN20 oval gear flow meter, set the pulse scaling to match their PLC high speed counter, and added a 120 micron inline filter. After six months of operation, the drift stayed below plus or minus 0.6 percent based on batch weight checks. The plant manager told us they saved 4 tons of tung oil per year just from reduced overfill. We have similar stories from coating plants in Indonesia and Nigeria using the same approach.
Output Options and Control Integration
All Silver Automation Instruments flow meters for tung oil can output 4-20 mA HART, pulse, and RS485 Modbus RTU. This lets you tie the meter directly to a PLC, DCS, or a batch controller. For fully automatic paint dosing, we often supply an oval gear meter with a dedicated batch totalizer like our XSR series. You set the target quantity in liters or kilograms and the controller opens a pneumatic valve, counts flow pulses, and closes the valve at the end of the batch. The cycle finishes in 2 minutes instead of 10 for manual weighing.
How to Order Your Tung Oil Flow Meter
Send us the following process data to get the most suitable model and price: operating pressure in bar, fluid temperature in degrees C, pipe size DN, minimum and maximum flow rate (L/h or kg/h), and information about the area classification (safe area, Zone 1, or Zone 2). If you know the viscosity at the working temperature, include that cP value too. We can supply the meter with factory calibration certificates traceable to ISO 17025. Our team in Australia supports English speaking customers across Oceania, Southeast Asia, Africa, and the Middle East. Visit flow-meter.com.au and use the Quick Quote form, or email our engineers directly.
Frequently Asked Questions
1. Can an oval gear meter handle tung oil viscosity above 500 cP? Yes. The SOG oval gear meter can manage up to 2000 cP with standard clearances. For cold tung oil above that, we can adjust the internal clearances to reduce shear stress and maintain accuracy.
2. Do I need a Coriolis meter for paint processing custody transfer? If you sell bulk tung oil or charge process departments by mass, a Coriolis meter is better because it provides direct mass flow for custody transfer with approvals. For internal batch control only, an oval gear meter is enough.
3. What is the minimum flow rate for a DN10 oval gear meter with tung oil? At 200 cP, a DN10 oval gear meter can measure down to 1 L/h with reasonable accuracy. For start stop batching, we recommend a higher start flow to get into the meter linear range quickly; 5 L/h is a safe minimum.
4. Does Silver Instruments offer ATEX certified meters for paint plants? Yes. We supply oval gear and Coriolis flow meters with ATEX Ex ia certification for Zone 1 and Zone 2. The certification body is CML or SGS. The delivery time for ATEX units is normally 4 to 6 weeks.
5. How should I clean the meter after metering tung oil? Flush the meter with a compatible solvent like white spirit or warm butyl acetate. We recommend installing drain valves upstream and downstream so you can circulate solvent for 5 to 10 minutes after each shift. Do not use water, as tung oil does not emulsify and will leave sticky residue.
Ready to specify a meter? Tell us your pressure (bar), temperature (°C), pipe size (DN), and flow range. Our engineers will reply within 24 hours with a data sheet and price. Silver Automation Instruments supplies flow meters and process gauges from stock and custom orders across four continents.
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