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Palm Oil Flow Meter DN50 for Refinery Bleaching Line Flow Metrics
Quick Answer: For a DN50 palm oil bleaching line, use an oval gear flow meter with PTFE gears or a Coriolis mass flow meter. Both types handle suspended bleaching earth particles and high viscosity without clogging. Silver Instruments offers both with 4-20 mA HART output and ATEX Zone 1 certification for refineries across Southeast Asia and Africa.
Flow measurement in a palm oil bleaching line is not a generic task. The oil moves through a DN50 pipe at 90 to 110 deg C, carrying 0.5 to 2 percent spent bleaching earth. A standard turbine meter wears out fast here. The abrasive particles chew the bearings. The viscosity swings between 40 and 80 cP at operating temperature. Engineers in Malaysia and Indonesia see this drift every few months until they switch to a positive displacement or Coriolis meter.
Magnetic flow meters cannot work in this line. Palm oil is non-conductive. Conductivity sits well below the 5 uS/cm threshold needed for an electromagnetic meter. So we skip that option right away. Here is the thing: most engineers skip the fact that bleaching earth is abrasive. An oval gear meter with PTFE inserts manages this well because the rotors do not rely on tight metallic clearances to measure. The oval gear design traps a fixed volume of fluid and turns it with every rotor sweep. Particles slide through without jamming the gears.
Silver Instruments OGM-DN50 oval gear meter covers a flow range of 2 to 15 m3/h with plus minus 0.5 percent accuracy. The wetted body is 316L stainless steel. Gears are PPS or PTFE, based on your operating temperature up to 150 deg C. Process connections are DN50 PN16 flanges standard, with NBR or PTFE O-rings. Output options include a raw pulse, 4-20 mA HART, and a local mechanical totalizer. A refinery in Medan, Sumatra replaced a turbine meter with our OGM-DN50. After 8 months, they still got repeatable readings within 0.6 percent, and maintenance was just a visual gear check every 6 weeks.
For mass balance, we recommend a Coriolis flow meter. Our CMT-DN50 Coriolis meter measures mass flow, density, and temperature at plus minus 0.2 percent accuracy. It handles the same temperature and abrasive mix because the straight tube design stays free of dead zones where earth settles. The meter gives you kg/h directly, which is what the DCS needs for bleaching line mass balance. The sensor is 316L, and we supply it with a remote transmitter for hot areas
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In practice, we size the meter for a nominal flow of 6 to 10 m3/h in a DN50 line. A short over-range up to 18 m3/h during flushing is acceptable for an oval gear meter if peak pressure stays below 16 bar. The meter does not need straight pipe runs. You can mount it vertically and let gravity drain it after cleaning. Coriolis meters need rigid supports and zero vibration to keep the specified accuracy, but they pay off in multi-variable data.
Send us your pressure (bar), temperature (deg C), pipe size (DN), and flow range. We will reply with a specific datasheet and price for your palm oil bleaching line. Just tell us the earth content percent and cleaning frequency you run. We will match the gear material and seal.
Frequently Asked Questions
Q: Why cannot I use a magnetic flow meter for palm oil?
A: Palm oil is non-conductive. An electromagnetic flow meter needs a minimum fluid conductivity of 5 uS/cm. Crude and bleached palm oil have no measurable conductivity. Use an oval gear or Coriolis meter instead.
Q: What flow range can a DN50 oval gear meter measure in a bleaching line?
A: Our OGM-DN50 meter covers 2 to 15 m3/h linearly. The typical bleaching line with DN50 pipe runs at 6 to 10 m3/h. This sits in the middle of the meter range, so accuracy stays tight.
Q: How does the meter handle bleaching earth particles?
A: The oval gear rotor clearance is wide enough to let fine earth pass. We add PTFE gear inserts for extra abrasion resistance. For larger clumps, install a Y-strainer with 0.5 mm mesh upstream. We have seen this setup run trouble-free in a refinery in Thailand for over a year.
Q: What output signals are available for refinery DCS integration?
A: You can choose 4-20 mA HART, pulse output for totalizing, or Modbus RTU. All Silver Instruments models for this line meet ATEX Zone 1 requirements and come with an IP67 enclosure.
Q: How often does a flow meter need recalibration in palm oil bleaching service?
A: We recommend onsite verification every 12 months because of the abrasive earth. Silver Instruments supports calibration checks in Malaysia, Indonesia, Nigeria, and Kenya. You can send the meter to our service center or request a field technician.
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