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Palm Oil Flow Meter DN50 Refinery Bleaching Line Flow Metrics
Quick Answer: For a DN50 palm oil bleaching line, a positive displacement oval gear meter or a Coriolis mass flow meter gives accurate volume or mass flow at 90 to 110 degrees Celsius. Both handle high viscosity and deliver 4-20 mA HART signals directly to your PLC. Silver Instruments supplies oval gear meters with PT100 compensation and optional ATEX Zone 1 certification for these lines.
Why Accurate Flow Metering Matters in the Bleaching Stage
Bleaching removes color pigments, soaps, and trace metals using activated bleaching earth. Process temperatures sit at 100 to 110 degrees Celsius and line pressures run around 3 to 5 bar. A 50 mm pipe carries 40 to 120 liters per minute of degummed palm oil. If the flow measurement drifts by just 1 percent over a month, a 200 tonne per day refinery in Indonesia or Malaysia loses thousands of liters of oil inventory data. Engineers and procurement teams in Southeast Asia and West Africa ask us for a meter that survives this heat and gives stable output for custody transfer and loss control. Standard turbine meters choke when the oil viscosity rises above 30 cP during cooler start-ups. That is why oval gear and Coriolis meters dominate this application.
Which Flow Meter Technology Fits a DN50 Palm Oil Bleaching Line
Electromagnetic flow meters will not work because palm oil is non-conductive. Vortex meters struggle with the high, varying viscosity. Thermal mass flow meters are designed for gases. The two practical choices are oval gear flow meters and Coriolis mass flow meters. An oval gear meter measures actual volume and tolerates viscosity swings from 10 cP to over 100 cP without recalibration. A Coriolis meter gives mass flow, density, and temperature from one device, but costs more. Most site engineers in the 10-to-100 person SME refineries pick the oval gear meter for DN50 because it is easier to clean during bleaching earth clogging events and delivers plus or minus 0.2 percent to 0.5 percent of reading accuracy. Silver Instruments builds our OGM series oval gear meters with 316L stainless steel internals, PEEK gears, and a built-in PT100 sensor for temperature compensation.
Silver Instruments OGM-DN50 Flow Metrics Snapshot
Here is the typical configuration we ship for 50 mm bleaching lines. Flow range: 10 to 160 liters per minute for palm oil at operating temperature. Process connection: DN50 PN16 or PN40 flanges, EN 1092-1 standard. Wetted parts: 316L stainless steel housing, PEEK gears, FKM or PTFE seals. Accuracy: plus or minus 0.2 percent of reading above 20 L/min; down to plus or minus 0.5 percent at low flow. Temperature rating: ambient minus 10 to process 150 degrees Celsius with integrated PT100. Output: 4-20 mA with HART 7 protocol, plus a scalable pulse output for batch control. Certifications: ATEX Zone 1 Ex ia IIC T4 as an option, IP67 enclosure. A plant supervisor in Sumatra told us their bleaching line runs at
Installation Tips for Bleaching Line Flow Meters
Bleaching earth fines can jam a volumeter if you skip the strainer. Always install a Y-strainer or basket strainer directly upstream of the oval gear meter. Keep a bypass loop so you can remove the meter during cleaning cycles without shutting down the whole line. Mount the meter in a horizontal pipe run with the flow direction marked on the body. Avoid installing it at the lowest point where solid residues settle. In practice, most engineers add a short spool piece with a drain valve just before the meter. Vent the meter housing after maintenance to remove air pockets. Because the meter outputs 4-20 mA HART, you can pull diagnostic data and temperature readings without opening the junction box. If you need density and mass flow in addition to volume, consider moving to a Coriolis meter. Our sales engineers can compare both options if you share your fluid properties and target process repeatability.
FAQ
Can the flow meter handle palm oil at 110 degrees Celsius? Yes. The OGM-DN50 with FKM seals and PT100 compensation operates continuously up to 150 degrees Celsius. The PTFE seal option works for temperatures below 120 degrees and offers better chemical resistance for trace bleaching earth carryover.
What output signal does the meter provide? Standard output is a 2-wire 4-20 mA with HART. You also get a passive NPN pulse output for remote totalizers or PLC counters. Fieldbus options like Modbus RTU over RS485 are available on request.
Is the meter approved for hazardous areas? Yes. We supply the OGM-DN50 with ATEX Zone 1 Ex ia IIC T4 certification at no extra cost for intrinsically safe installations. Sil-2 compliance hardware is an option for safety instrumented systems.
How often does the oval gear meter need recalibration in bleaching duty? With a proper upstream strainer and steady operating temperature, users check calibration every 12 to 18 months. One Ghanaian refinery runs the same OGM-DN40 for 24 months before sending it for bench verification, with drift staying under 0.15 percent.
Can this meter replace a turbine meter on an existing DN50 line? Yes. The face-to-face length of our OGM-DN50 aligns with common EN 558-1 series dimensions, so you can often drop it into the same spool without cutting pipe. Check the flange pressure rating and strainer addition before ordering.
Send us your operating pressure (bar), temperature (degrees Celsius), pipe size (DN), and flow range for a fast quote. Email our refinery metering team at [email protected] or visit the oval gear flow meter product page at flow-meter.com.au to download the datasheet.
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