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Palm Oil Flow Meter 50 m3/h: Industrial Mill Offloading Setup & Selection Guide
Quick Answer: For palm oil offloading at 50 m³/h, choose an oval gear flow meter with DN80 or DN100 body and PTFE gears. If your budget allows, a Coriolis mass flow meter gives you density and temperature data on the same device. Always install a strainer upstream and request ATEX Zone 2 certification for the transmitter if the loading bay handles hot crude palm oil above its flash point.
Why a standard flow meter fails in palm oil service
Palm oil is not water. It is viscous, it solidifies below 30 °C, and it often carries traces of fibre or kernel shell from the mill. Most engineers learn this the hard way when a turbine meter seizes after three days of offloading. We have seen this on customer sites many times. A flow meter designed for diesel or water cannot handle crude palm oil at 50 °C with a viscosity of 40 cP. The internal moving parts gum up, the bearings wear fast, and the meter stops giving a steady 4-20 mA signal.
A mill in Sumatra offloads 20 tonnes of CPO per truck into a storage tank. The line runs at 50 m³/h through a 3-inch pipe. Their original oval gear meter without a strainer failed within two weeks because palm oil solids scored the measuring chamber. Silver Instruments replaced it with an OG-Series oval gear meter with a 0.5 mm mesh strainer and PPS rotors. That meter has been running for 18 months without maintenance.
Which flow meter technology fits 50 m³/h palm oil offloading
You have two solid options for a 50 m³/h offloading skid. The first is an oval gear flow meter. The second is a Coriolis mass flow meter. Let us look at both.
Oval gear flow meter — This meter works well because palm oil lubricates the gears. It handles high viscosity up to 2000 cP. For 50 m³/h, we recommend DN80 (3-inch) flanged connections. The accuracy is ±0.5% of reading. If your loading meter must meet local weights and measures regulations, ask for a meter with PTB or OIML certification. The Silver OG80CH model comes with a cast steel body, FKM seals, and a pulse output for batch control. It also has a local totalizer so the operator can read the volume even without a PLC.
Coriolis mass flow meter — This meter measures mass directly, not volume. So density changes at different temperatures do not affect the net weight. It is the better option when you buy or sell palm oil by weight. A DN50 Coriolis meter covers 0–60 m³/h of CPO at 50 °C. The Silver COR-Series with Hastelloy C-22 tubes handles the free fatty acids in crude oil without corrosion. The transmitter outputs mass flow, density, and temperature over Modbus RTU. One customer in Honduras uses a Coriolis meter on his offloading arm to compare the truck weight scale with the meter net weight. The difference is often less than 0.2%.
Installation manual highlights for 50 m³/h lines
Most offloading problems come from bad installation, not from the meter itself. Follow these points.
Place the meter after the offloading pump and before the receiving tank inlet. Keep the meter in the discharge line, not the suction side. The line pressure at the meter should stay above 1.5 bar to prevent air release from the oil. Install a Y-type strainer with a mesh size of 0.5 mm directly upstream of the meter. A strainer protects the measuring chamber from solids and saves you from frequent cleaning.
For oval gear meters, mount the meter horizontally with the register faci
Do not use electromagnetic flow meters. Palm oil has a conductivity below 1 µS/cm. The magmeter will read zero. One customer in Nigeria tried a magmeter because it was “cheap and no moving parts.” He sent it back after one week.
If the offloading area handles warm oil near its flash point, fit the transmitter with ATEX Zone 2 or Zone 1 approval. For oval gear meters, the pulse pickup is usually a reed switch or NAMUR sensor that can be made intrinsically safe without much extra cost.
Commissioning and calibration steps
Before the first offloading, run a batch of oil at 25% flow, then at 50%, then at 100%. Check the meter factor against a calibrated vessel or weighbridge. Palm oil expands about 0.07% per °C. So if you compare volume at 30 °C and 50 °C without temperature compensation, you will see a difference of 1.4%. A PT100 integrated into the meter transmitter can correct this automatically.
For the Oval gear meter, set the K-factor in your batch controller. For 50 m³/h, a typical K-factor is 85 pulses per litre on the DN80 model. Your specific value comes with the calibration certificate. Do not use the generic K-factor from the catalogue.
Maintenance intervals that keep the meter alive
Clean the strainer every month. Inspect the measuring chamber every six months. If you see scoring or dark marks on the rotors, replace them. The cost of new rotors is small compared to the cost of a faulty delivery claim. Palm oil with high FFA above 5% can degrade FKM seals within a year. Consider upgrading to PTFE seals from the start.
FAQ
Can I use a turbine flow meter for palm oil offloading at 50 m³/h? No. The viscosity and suspended solids damage the bearings quickly. You might get a few weeks of service before failure.
What pipe size do I need for a 50 m³/h flow meter? We recommend DN80 (3-inch) for oval gear and DN50 for Coriolis. A 2-inch pipe would create a pressure drop above 0.5 bar at that flow, which is not ideal.
How do I handle air in the line during offloading? Install an air eliminator upstream. The oval gear meter counts air as volume. Air elimination keeps the batch total accurate.
Does the meter need temperature compensation? Yes. For custody transfer, the net volume must be converted to 40 °C or 50 °C base temperature. Specify the meter with a PT100 sensor and a flow computer or PLC that does the API correction.
What ATEX zone do I need for palm oil offloading? Crude palm oil has a flash point around 220 °C. In closed unloading areas with hot oil above 100 °C, we recommend Zone 2 certification. For most open-area installations, non-ATEX equipment is fine. But check with your local safety authority.
Send us your offloading flow rate, pipe size, temperature, and whether you need custody transfer approvals. Our engineers will recommend a meter model with a fixed price quote within one working day. Request your quote at flow-meter.com.au.
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