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Paraffin Oil Flow Meter for Industrial Wax Blending Operations
Quick Answer: An oval gear positive displacement meter with PT100 temperature compensation works well for paraffin oil dosing in wax blending. When the recipe calls for variable viscosity or high temperature, a Coriolis mass flow meter removes the need for density tables. Send your pipe size, flow range, and fluid temperature for a model that fits your batch skid.
What You Are Actually Measuring in a Wax Blending Plant
Paraffin oil is the carrier fluid. A blending operation in Vietnam or Mexico combines it with microcrystalline wax, tackifiers, and fillers to make industrial wax. The paraffin oil temperature sits between 60 and 90 °C during blending. Viscosity can range from 15 cP to 200 cP depending on the grade and heat. Batch sizes often run from 500 to 5000 litres. A flow meter must handle these real conditions without drifting or clogging.
We have replaced turbine meters on these lines many times. Turbines slow down when viscosity climbs. The reading drifts low and the operator over-doses paraffin oil. The batch fails a penetration test and the whole kettle gets reworked. A positive displacement oval gear meter avoids this because each pocket of fluid moves the gears, regardless of viscosity. The output is volumetric, and you get a pulse every time a known volume passes.
Why Oval Gear Meters Dominate Paraffin Oil Batching
An oval gear flow meter from Silver Automation Instruments covers DN15 to DN80 in carbon steel or stainless steel. The gears can be PPS or PTFE. For paraffin oil at 80 °C we recommend the PTFE gear option. The meter body includes a PT100 temperature sensor slot. You can tie the 4-20 mA HART output back to a PLC or batch controller. The viscosity range reaches 2000 cP, so your paraffin oil is well within limits.
In practice, a wax factory in Thailand runs 20 batches a day with a single oval gear meter on the paraffin oil header. The repeatability on the meter is ±0.2% of reading. That is enough to keep the oil-to-wax ratio inside the spec without manual checks. The meter sends a pulse output to a flow computer that opens and closes a pneumatic ball valve. Fill accuracy stays within 0.5 kg of the recipe target across 300 batches a month.
When to Move Up to a Coriolis Mass Flow Meter
Some blending plants switch paraffin oil grades between light paraffin oil and heavy paraffin oil. Density changes from 0.81 kg/L to 0.89 kg/L depending on the cut. A volumetric oval gear meter still works if you factor in temperature correction. But sometimes the recipe is written in mass, not volume. If you weigh the kettle on load cells, you will see a mismatch if the meter counts litres while the weighbridge counts kilograms.
A Coriolis mass flow meter gives you mass flow directly in kg/h. You do not need a density table or a separate temperature compensation routine. The meter also reads density, temperature, and mass totalizer on the same 4-20 mA HART loop. We supply a compact Coriolis meter with dual U-tubes in 316L for these applications. It fits a DN10 to DN50 line and handles up to 150 °C. A wax compounder in Surabaya switched from volumetric to mass metering two years ago and cut their batch reject rate by half. The main reason was eliminating the density offset error on heavy para
What Viscosity, Temperature, and Pipe Size Do You Need to Specify
Engineers often skip this part. They ask for a quote without giving the paraffin oil temperature and viscosity range. But at 80 °C paraffin oil flows differently than at 30 °C. If you plan a cold start in winter, the oil viscosity can spike to 300 cP. The meter must not stall. We have seen this on customer sites in southern Australia where the blending room temperature drops to 10 °C overnight.
Give us three numbers. Pipe diameter (DN15, DN25, DN40, DN50, DN80). Minimum and maximum flow rate in litres per minute or kg per hour. Operating temperature and highest viscosity you expect. If the system uses a pneumatic valve with fast opening, mention the peak flow surge. That surge can overspeed an oval gear meter if you pick an undersized model.
Signal Integration into a Batch Skid
Most blending skids in Southeast Asia use a small PLC, a touch panel, and a relay output for the valve. Our oval gear meter outputs a square wave pulse. You wire the pulse into a high-speed input on the PLC and scale it. One pulse equals 1 mL or 10 mL depending on meter size. The PLC counts pulses and stops the fill. If your skid does not have a free high-speed input, we can bundle a panel-mount flow totalizer with a relay trip. The totalizer accepts the meter pulse and trips the valve contact directly. That way you do not need to modify the PLC code.
When the plant has a DCS or a more complex control system, the 4-20 mA HART output becomes useful. You get instantaneous flow rate, totalizer value, and temperature over HART without extra wiring. This setup is common in lubricant blending plants in the Middle East where the paraffin oil line supplies multiple blending kettles through a manifold.
Frequently Asked Questions
What flow meter type handles paraffin oil best? Oval gear positive displacement meters for volumetric batching and Coriolis mass meters for mass batching. Both handle viscosities up to several hundred cP without losing accuracy.
Can the meter run at blending temperatures above 100 °C? Yes. Our oval gear meters with PTFE gears and high-temperature pickups work up to 150 °C. Coriolis meters with 316L tube can operate at 150 °C continuously.
Do I need ATEX certification for a wax blending plant? Often yes if the paraffin oil mist or wax solvents create a Zone 1 or Zone 2 area. Silver Automation Instruments supplies ATEX-certified oval gear and Coriolis meters with intrinsically safe pulse outputs.
What if my paraffin oil density changes with grade? If you dose by volume, use a volumetric meter with live temperature correction. If the recipe uses mass, switch to a Coriolis mass meter to avoid density table errors.
How do I get a paraffin oil flow meter price and lead time? Send us your paraffin oil temperature, viscosity range, pipe size (DN), flow range, and signal requirement. We will return a quote for the correct oval gear or Coriolis meter within one business day.
Silver Automation Instruments supplies flow meters for wax blending plants from DN15 to DN80. Contact our project team with your pipe size, paraffin oil temperature, and flow range. We will specify the right meter and include wiring diagrams for your batch controller.
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