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Vegetable Oil Flow Meter 50 m3/h Bulk Invoicing Custody Transfer
Quick Answer: For vegetable oil custody transfer at 50 m³/h, you need a positive displacement flow meter or a Coriolis mass flow meter with legal metrology approval. Silver Automation Instruments supplies oval gear meters with pulse output, PT100 temperature compensation, and OIML R117 or MID MI-005 certification. Supply your oil type, viscosity, pipe size, and pressure rating and we will select the right meter and send a quotation.
A bulk vegetable oil loading station that invoices by the litre cannot afford drift in the meter. Turbine meters react to viscosity shifts; electromagnetic meters do not work on oil because it is non-conductive. In practice, most engineers specify oval gear flow meters for edible oil applications from 500 L/h up to 60 m³/h. The oval gear design traps a known volume of liquid in the rotating chambers. The output is a pulse signal directly proportional to volumetric flow, unaffected by temperature, viscosity, or flow profile changes within the meter specification.
Here is the thing about 50 m³/h metering. A DN80 oval gear meter typically handles 10 to 60 m³/h. At 50 m³/h and a viscosity of 40 cP (typical for soybean oil at 40 °C), the pressure drop stays below 0.4 bar. Repeatability reaches 0.03% and linearity is within ±0.2% of reading. For tax or trade invoicing, many countries require OIML R117 accuracy class 0.5 or MID MI-005. Silver Instruments OGM series oval gear meters carry these certifications when ordered with the custody transfer package. The package includes an 8-digit non-resettable totaliser, pulse output with a K-factor of 10 pulses per litre, and a tamper-proof housing.
On a job in central Vietnam, an edible oil refinery loading ISO tank containers needed 45 m³/h batch control. They used an OGM-DN80 oval gear meter with integrated PT100 and a remote batch controller. The meter body was cast iron with aluminium rotors and FKM seals, suitable for vegetable oil at 50 °C. A 4-20 mA HART signal went to the control room for real-time flow rate, while the dry-contact pulse drove the invoicing counter. The system paid for itself in six months because the billing accuracy eliminated disputes with the logistics provider.
We also supplied meters to a palm oil fractionation plant in Nigeria. Their raw palm olein ran at 50 m³/h through a steam-jacketed oval gear meter to keep the fat above its melting point. The meter came with PTFE bearings and an ATEX Zone 2 certification because the loading bay was classified. The pulse output fed a PLC that printed delivery tickets. That meter has been in service for three years with only routine cleaning of the inlet strainer.
Coriolis mass flow meters are an option when you need direct mass measurement for vegetable oil with varying density. A Coriolis meter can output kg/h, density in kg/m³, and temperature simultaneously. At 50 m³/h, a DN50 or DN65 Coriolis sensor handles the flow with an accuracy of 0.1% to 0.15% of rate. The initial cost is higher than an oval gear meter, but you get multivariable output and zero moving parts. For pure custody transfer of palm oil, coconut oil, or sunflower oil where the density varies by batch, we often recommend the Coriolis path when the budget allows.
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Pressure and temperature compensation turns a volumetric reading into a standard volume at 15 °C for trade. The OGM meter accepts a PT100 input directly. A HART-enabled transmitter reads the 4-20 mA from the flow meter and the temperature signal, then applies the API or ISO 91-1 table for vegetable oils. You get net standard volume on the local display and over Modbus RTU. Silver Instruments configures this compensation at the factory according to your oil type and density coefficient.
Send us your pressure (bar), temperature (°C), pipe size (DN), oil type, and flow range. We will recommend the right meter model, confirm certification requirements, and return a price and lead time within 24 hours. Reach the sales team directly through the contact page on flow-meter.com.au.
Frequently Asked Questions About Vegetable Oil Custody Transfer Flow Meters
What flow meter type is best for vegetable oil invoicing at 50 m³/h? Positive displacement oval gear meters give the highest repeatability for batch custody transfer of edible oils because they measure a fixed volume per revolution. Coriolis mass flow meters are also approved for trade and provide mass flow directly, which removes the density compensation step. Electromagnetic and turbine meters are not suitable for vegetable oil billing.
Do Silver Instruments meters come with OIML or MID certification? Yes, the OGM oval gear series can be ordered with OIML R117 class 0.5 or MID MI-005 pattern approval. Each meter ships with a calibration certificate traceable to national standards. For ATEX areas, we supply meters with Ex db or Ex ia certification according to the zone classification.
What is the pressure drop at 50 m³/h for a DN80 oval gear meter? With medium viscosity vegetable oil around 40 cP, the pressure drop across the meter is typically 0.3 to 0.5 bar. High-viscosity oils like palm stearin at 55 °C may increase the drop to 0.7 bar. We size the meter to keep pressure loss within allowable limits for your pumping system.
Can I get a pulse output and a local totaliser for a batching system? All OGM custody transfer meters include a dual-channel pulse output (dry contact or open collector) and an 8-digit mechanical or electronic totaliser. You can connect the pulse to a batch controller, PLC, or invoicing software. A 4-20 mA HART signal is available for flow rate and temperature retransmission.
What maintenance does a vegetable oil flow meter need? Inspect the inlet Y-strainer every month and clean it. Replace the oval gear bearings and seals every two to three years depending on operating hours and oil cleanliness. The meter does not require recalibration unless the mechanical parts are replaced or the local weights and measures authority requires periodic verification.
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