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Linseed Oil Flow Meter for Paint Manufacturing Control

Quick Answer: Linseed oil used in paint production needs a positive displacement or Coriolis mass flow meter for accurate batching. Silver Instruments supplies the OGF oval gear flow meter with 4-20 mA HART output, handling viscosities up to 2000 cP. Send your flow range, pipe size, oil temperature and pressure to get a specific model recommendation.

Why linseed oil flow measurement is tough in a paint plant

Linseed oil is the binder in many alkyd paints and industrial coatings. Its viscosity changes with temperature and grade. At 20 °C, raw linseed oil sits near 50 cP. In winter in a factory in Turkey or Vietnam, the oil can reach 200 cP. When the oil is heated for easier transfer, viscosity drops to 15 cP. A flow meter without temperature compensation will drift. In practice, operators in paint manufacturing see batch deviation when they rely on a cheap turbine meter. The sticky nature of oxidized linseed oil also coats gear teeth and chambers. Many conventional meters clog or show ghost readings after a few weeks. This is where positive displacement meters win. They still count every pocket of oil even when the viscosity changes. Silver Instruments has supplied oval gear meters for linseed oil batching to paint factories in Indonesia, Egypt, and Chile. Most engineers skip the trial with low cost paddle wheel meters because they know linseed oil will gum up the rotor.

Oval gear flow meter for linseed oil: OGF series

The OGF oval gear meter from Silver Instruments is a positive displacement meter designed for oils, resins, and solvents in paint production. It uses a pair of oval rotors that mesh and rotate inside a precision chamber. Each rotation displaces a fixed volume. Because the clearance between rotors and housing is tight, even high viscosity linseed oil cannot slip past. The meter repeats within ±0.2 percent. Accuracy is typically ±0.5 percent of reading across a 10:1 turndown. We offer sizes from DN4 up to DN80. For a typical paint batching line moving 200 to 2000 kilograms per hour of linseed oil, a DN15 or DN20 OGF meter works well. The meter body is stainless steel 316L with PTFE gears for chemical compatibility. The output is a pulse signal or 4-20 mA with HART. You can connect it to a PLC or a Silver Instruments paperless recorder. For hazardous areas around solvent based paints, we supply ATEX Zone 1 certified transmitters.

Coriolis mass flow meter alternative for linseed oil

If your paint recipe demands mass measurement instead of volume, a Coriolis meter is the other option. Linseed oil density is about 0.93 g/cm³. Small density changes due to temperature affect volume based batching. A Coriolis flow meter from Silver Instruments, model MFC, measures mass directly. It ignores viscosity, density, and temperature swings. This is critical when a paint manufacturer in Brazil switched from a volumetric oval gear meter to a Coriolis meter and reduced raw material variance by 1.2 percent. The MFC meter comes in DN15 to DN100 sizes with 316L wetted parts. It handles linseed oil at temperatures up to 150 °C with an integrated PT100 sensor. The meter requires a straight pipe run of only 5D upstream. For a large paint plant in Mexico batching 5000 kg/h of linseed oil into a disperser, the DN25 MFC Coriolis meter worked without strainers or filters. The meter self drains, which helps when cleaning solvent is flushed through.

Applying a flow meter in paint manufacturing controls

In a typical alkyd paint plant, linseed oil is received

Linseed Oil Flow Meter Industrial Paint Manufacturing Controls

in bulk and stored in heated tanks. From the tank, a pump sends oil through a filter, a flow meter, and into a weigh tank or directly into a mixer. The flow meter signal triggers a control valve to close at the preset target. Silver Instruments recommends installing the flow meter after a Y strainer with 60 mesh. This catches iron oxide particles that can lock the oval gears. The pipe size is often DN25 or DN40. Oil temperature may be held at 30 to 40 °C. The pressure drop across the meter should stay below 0.5 bar at maximum flow. Our engineers often see customers install the meter too close to a pump. That causes pulsation. We advise at least 10 pipe diameters of straight run downstream of a positive displacement pump. For batching control, the pulse output from an oval gear meter goes to a batch controller. A customer in Vietnam set up a very accurate system where 1000 liters of linseed oil is dispensed into a mixer with an error of less than 3 liters. They used a Silver Instruments OGF-A20 meter with a TR20 batch controller and a pneumatic shutoff valve.

Integration with automation systems

The flow meter outputs must talk to the plant DCS or PLC. All Silver Instruments linseed oil flow meters provide 4-20 mA with HART as standard. The HART signal lets you read flow rate, total, and temperature. In new paint factories across the Middle East, engineers use Modbus RTU via RS485. We offer that as well. The connection is simple 2 wire loop powered for the oval gear meter. Coriolis meters need a separate power supply but output active 4-20 mA signals. Because paint plants often handle multiple raw materials like soya oil, tall oil fatty acid, and solvents, our paperless recorder with math functions can totalize each stream and send data to the ERP via Ethernet. A paint manufacturer in South Africa now monitors linseed oil consumption per batch remotely. They reduced manual logs and invoice disputes.

Five questions engineers ask us about linseed oil flow meters

1. What is the best flow meter for raw linseed oil? An oval gear positive displacement meter is the most cost effective and repeatable. For mass batching, a Coriolis meter eliminates density errors. We supply both in 316L steel with CE certification.

2. Can the meter handle heated linseed oil? Yes. The OGF series works up to 120 °C. The MFC Coriolis meter works up to 150 °C. Specify the temperature when you request a quote so we select the right electronic housing.

3. How do I prevent the meter from sticking after shutdown? Flush the meter with solvent while the oil is still warm. Our oval gear meter has a simple opening for cleaning. A strainer upstream is a must. In practice, a customer runs cleaning solvent at the end of each batch cycle automatically.

4. What output signals are available? Pulse, 4-20 mA with HART, Modbus RS485, and also simple mechanical registers for local display. We can supply ATEX certified transmitters for Zone 1.

5. How fast can I get a quote and lead time? After you send us the linseed oil flow range in kg/h, pipe diameter DN, temperature in °C, and pressure in bar, we reply within 24 hours. Standard meters ship in 2 to 3 weeks. Ex stock delivery is possible for popular sizes like DN15 and DN20.

Need a linseed oil flow meter for your paint factory? Send the fluid temperature, pressure, pipe size, and flow range. Our team will propose an OGF or MFC model with price and datasheet. Visit our product page for oil flow meters at flow-meter.com.au or use the contact form with your project details.

Linseed Oil Flow Meter Industrial Paint Manufacturing Controls