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Paraffin Oil Flow Meter for Industrial Wax Blending Operations
Quick Answer: Paraffin oil flow meters in wax blending must handle viscosity swings, high temperatures, and frequent batch dosing. Silver Instruments supplies oval gear meters and Coriolis mass meters that work from 5 cP up to 10,000 cP, with optional heating jackets for waxy lines. These meters deliver 0.5% accuracy or better and send real-time data via 4-20 mA HART or Modbus to your blending controller.
Why Measuring Paraffin Oil in Wax Blending Is Tricky
Wax blending operations mix paraffin oil with waxes, additives, and polymers to make industrial wax for candles, coatings, and packaging. The oil is often heated to 70–100 °C to keep it flowing. At those temperatures, viscosity can still range from 10 cP to over 500 cP depending on the grade. As the blend cools, the wax starts to precipitate. Any flow meter you install must cope with these changing conditions without clogging or losing accuracy.
Here is the thing most engineers skip: paraffin oil rarely flows at a steady rate in blending. You dose in pulses, you ramp up agitators, and you wait for temperature loops to settle. A flow meter that works fine on a steady water test bench can drift badly in real blending. We have seen this repeatedly on customer sites in Vietnam, Indonesia, and Saudi Arabia.
Which Flow Meter Technologies Actually Work
Two meter types dominate paraffin oil blending because they stay accurate and do not clog. Silver Instruments oval gear flow meters use a pair of precision gears that rotate in a measuring chamber. The gears sweep the chamber walls, pushing sticky paraffin through and leaving almost no residue. With PTFE or peek internals, these meters handle 1 cP to 10,000 cP and process temperatures up to 200 °C. You get pulse output, 4-20 mA HART, or Modbus, and you can add an integrated PT100 for temperature-compensated volume. Accuracy of ±0.5% of reading is standard.
The second option is a Coriolis mass flow meter. Coriolis meters measure mass directly, so you get kg/h regardless of viscosity or temperature swings. This matters when your blending recipe calls for a fixed mass of paraffin oil per batch, not a volume. A Silver Instruments Coriolis meter with DN15 or DN25 connections gives you mass flow, density, and temperature from one sensor. Accuracy hits ±0.2% for mass flow. These meters also meet ATEX Zone 1 and Zone 2 requirements for solvent-laden environments found in many wax plants.
A Real Site Example from a Wax Blending Plant
Last year, a candle wax manufacturer in Malaysia approached us. They blend paraffin oil, microcrystalline wax, and stearic acid in 5-tonne heated vessels. Their old turbine meter seized up every two weeks because wax residue built up on the rotor. They wasted hours cleaning and recalibrating.
We installed a DN25 oval gear flow meter with a carbon steel body and PTFE gears. The meter runs at 82 °C and handles a viscosity range of 2
Installation Tips for Heated Paraffin Oil Lines
If your paraffin oil solidifies below 45 °C, install a heating jacket on the meter body. Silver Instruments oval gear meters accept steam or electric tracing jackets that keep the chamber at your process temperature. Without a jacket, the meter can lock solid during shutdowns. Also mount the meter where you can drain it easily, and never install a flow meter at the lowest point of a waxy line. Trapped cold oil will harden and damage the internals on the next start-up.
Use straight pipe runs of 5xDN upstream and 3xDN downstream. The paraffin oil flow profile is laminar at typical blending velocities, so flow straighteners help if space is tight. And always install a 100-mesh strainer upstream. Waxy oils can carry small carbonized particles that score the oval gears.
FAQ
Which flow meter is better for paraffin oil, oval gear or Coriolis? For volume-based batching where cost matters, choose oval gear. For mass-based recipes or custody transfer, choose Coriolis. Both work well. The right choice depends on your recipe units (litres vs kg) and your budget.
Can I use an oval gear meter if my paraffin oil solidifies at room temperature? Yes, if you keep the meter heated during operation and purge it with a light solvent or hot oil before a long shutdown. Add a jacket and a drain valve. We do this all the time in wax plants.
What output signal do I need for batch blending? Most blending controllers accept pulse or 4-20 mA. Our meters offer both. Pulse gives fast totalisation for precise batching. 4-20 mA HART is useful when your PLC is far from the meter and you need diagnostics.
How do I size the meter for my paraffin oil line? Give us your minimum and maximum flow rate in litres per minute or kg per hour, viscosity in cP at operating temperature, pipe DN, and process temperature. We will select the right meter size and gear material. Do not guess the viscosity; we have seen incorrect sizing when users assume water-like values.
Do you supply flow meters with ATEX certification for wax blending? Yes. Our oval gear and Coriolis meters come with ATEX, IECEx, or NEPSI certifications for Zone 1, Zone 2, and Zone 21. We ship to Malaysia, Thailand, Saudi Arabia, Mexico, and many other markets with the required certificate documentation.
Tell us your process details and we will send you a quote. Send your paraffin oil temperature, viscosity in cP, pipe size (DN), flow range, and output preference to our engineers. We respond within one working day with a recommended meter and price. See our full range at flow-meter.com.au.
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