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Palm Oil Flow Meter 10 L/min Additive Dosing Valve Integration
Quick Answer
For palm oil additive dosing at 10 L/min, Silver Instruments recommends an oval gear flowmeter with integral dosing valve control. This positive displacement meter handles high viscosity up to 500 cP and temperatures to 120 °C. It delivers repeatability of ±0.2% for precise dosing of bleaching earth, phosphoric acid, or deodorizer distillates.
Application Background
Palm oil refineries in Indonesia and Malaysia dose additives continuously. A flow setpoint of 10 L/min is common for dosing bleaching clay slurry or citric acid solution. The dosing valve opens and closes based on flowmeter pulses. Integration must be fast and accurate because over-dosing damages product quality and wastes chemicals.
Many plants still use manual adjustment. That causes batch inconsistency. We have seen this on customer sites many times. A refinery in Sumatra asked us last year for a solution after their manual dosing caused off-spec color in RBD palm oil. The problem disappeared when we added an oval gear meter with a pneumatic dosing valve.
Why Oval Gear Meters for Palm Oil Dosing
Palm oil is viscous. At dosing temperatures around 60–80 °C viscosity is often 30–80 cP. Additive slurries can reach 200–500 cP. Electromagnetic flowmeters need conductive liquids and cannot handle non-aqueous additives. Turbine meters lose accuracy with viscous fluids. Oval gear meters give true volume displacement regardless of viscosity changes.
The oval gear principle is simple: two oval rotors mesh inside a measuring chamber. Each rotation displaces a fixed volume. A pulse output (reed switch or NPN) sends signals to the dosing valve controller. At 10 L/min, even a small DN10 or DN15 oval gear meter works with pulse resolution of 500–1000 pulses per liter. This gives fine control for incremental dosing.
Recommended Meter and Valve Setup
Silver Instruments model SOG-10 oval gear flowmeter fits a 10 L/min dosing loop. It has DN15 process connections, 316L stainless steel body, PEEK gears, and PTFE seals. The pulse output connects directly to a PLC or dosing controller. Accuracy is ±0.5% of rate, repeatability ±0.1%.
Integrate with a pneumatically actuated globe or ball valve. Use a 4–20 mA positioner or simple on/off solenoid valve with PWM control. The PLC counts pulses from the meter and adjusts valve opening to maintain flow setpoint. Include a strainer upstream of the meter. Solid particles in additives can jam the oval gears.
For high-temperature additive dosing (above 120 °C), use a Coriolis mass flowmeter. The Silver Instruments SMF-15 mass flowmeter measures mass directly in kg/h. It ignores viscosity and temperature shifts. But the price is higher. Most 10 L/min dosing applications do well with the oval gear meter.
Installation and Commissioning Tips
Mount the meter with inlet and outlet straight runs. O
Preheat the meter jacket if palm oil can solidify. A temperature sensor (PT100) near the meter helps monitor viscosity. Viscosity above 500 cP may require gear modification to avoid over-torque.
In practice, most engineers skip the jacket and rely on hot additive temperature. But if the line stops, solid fat can block the gears. A simple heating tape solves this. We have seen a plant in Nigeria learn this the hard way after a weekend shutdown.
Customer Case: Malaysian Oleochemical Plant
A Malaysian oleochemical plant doses 10 L/min of bleaching earth slurry into crude palm oil. They used a manual needle valve and sight glass. Dosing was inconsistent, and batch cycle time varied. They installed a Silver Instruments SOG-10 oval gear meter and a pneumatic V-port ball valve with 4-20 mA positioner. The PLC closed the loop with pulse feedback. After integration, dosing accuracy improved to ±0.3% of setpoint. Chemical cost dropped 12% and product color consistency improved. They ordered three more units for other lines.
How to Order or Get a Quote
Send us your operating parameters. We need fluid name, flow range (L/min), viscosity (cP), temperature (°C), pressure (bar), pipe size (DN), and connection type (flange, thread, tri-clamp). Also confirm if you need ATEX Zone 1 or Zone 2 certification. We will propose a meter with the right pulse output and recommend a compatible dosing valve.
Contact us via our website flow-meter.com.au or email [email protected]. Our engineers will reply within 24 hours with a datasheet and price.
FAQ
What is the best flowmeter for 10 L/min palm oil additive dosing?
An oval gear positive displacement flowmeter with pulse output. Silver Instruments SOG-10 handles 10 L/min accurately even with viscous slurries.
Can I use a magnetic flowmeter for palm oil?
No. Magnetic flowmeters need conductive liquids. Palm oil and most oil-based additives are non-conductive. Oval gear or Coriolis is required.
How do I integrate the flowmeter with a dosing valve?
Connect the meter pulse output to a PLC or batch controller. The controller compares actual flow to setpoint and sends a 4-20 mA signal or on/off signal to the dosing valve. Silver Instruments gives wiring diagrams for all meters.
What certification is needed for palm oil plants?
Most dosing areas are not hazardous. But if your plant has Ex zones, specify ATEX or IECEx. Silver Instruments offers ATEX Zone 1 certified meters with intrinsically safe pulse outputs.
What maintenance does the oval gear meter need?
Clean the strainer monthly. Inspect gears every 6 months for wear. If you dose abrasive slurries, use tungsten carbide bearings. We supply spares and rebuild kits.