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Heavy Fuel Oil Flow Meter 50 m3/h for Bulk Offloading Pump Controls
Quick Answer: For heavy fuel oil offloading at 50 m3/h you need a positive displacement flow meter with pump control interface. Silver Instruments supplies DN50 or DN80 oval gear meters that output a 4-20 mA signal and pulse to start, stop, or throttle your offloading pump. This setup prevents overfill, improves custody transfer accuracy, and works reliably in marine, power plant, and industrial boiler applications.
Why Oval Gear Meters Handle HFO at 50 m3/h
Heavy fuel oil is thick, sticky, and often loaded hot. Viscosity can range from 180 cSt to 700 cSt at 50 °C. Turbine and electromagnetic meters struggle with this. Oval gear flow meters are positive displacement devices. They trap a fixed volume of liquid between two oval-shaped rotors and measure it directly. The reading does not drift when viscosity, density, or temperature changes. That matters when you are buying or selling bunker fuel worth thousands of dollars per delivery.
At 50 m3/h a DN50 oval gear meter works well. If the pumping pressure is low or the HFO has solid residues, we often recommend stepping up to DN80 to reduce pressure drop and avoid clogging. The meter body is cast steel or stainless steel. Rotors are hardened steel or PPS with good chemical resistance. Bearing materials are tungsten carbide or carbon graphite for long service life.
Bulk Offloading Pump Control Without a PLC
Most engineers want the flow meter to control the pump directly. You do not always need a separate PLC. Our oval gear meters come with a dual-channel pulse output and a 4-20 mA analog output. The pulse signal goes to a batch controller like the Silver Instruments SZY-B series. The batch controller displays the total volume and triggers a relay output when the setpoint is reached. That relay can be wired to stop the pump motor or close a solenoid valve.
For variable speed pump control, the 4-20 mA signal is more useful. Connect it to a VFD (variable frequency drive). The flow rate signal adjusts the pump speed to maintain a steady 50 m3/h transfer. This avoids pipe hammer when starting a cold HFO line. It also prevents pump cavitation if the suction tank level drops.
We have seen this exact setup on a barge offloading terminal in Surabaya, Indonesia. The customer used an oval gear meter with a SZY-B batch controller and a relay to stop a 15 kW screw pump. The accuracy was better than ±0.5% of reading. That is tight enough for fiscal metering between the barge operator and the shore tank farm.
Temperature Compensation and ATEX Safety
HFO is often offloaded at 50–70 °C. Volume expands with temperature. For sales-grade accuracy you need temperature compensation. Silver Instruments can embed a PT100 sensor in the meter body. The flow computer (model SZY-R300) accepts the 4-20 mA temperature signal and corrects volume to 15 °C or 20 °C base conditions. This is standard practice in marine bunkering and ISO 8217 fuel delivery.
Heavy fuel oil vapors can create an explosive atmosphere. If your offloading
Common Installation Mistakes at 50 m3/h
Air pockets destroy accuracy. HFO lines must be kept full. Install a strainer upstream to catch grit and scale. If the line is empty between transfers, add a vent valve at the meter inlet to release air before the pump starts. On a recent project in Bangladesh, the operator noticed the meter total was 3% lower than the tank dip. The cause was a partially filled pipe on a sloping section. A simple air eliminator solved it.
Fast valve closing creates water hammer. When the batch controller stops the pump at end of delivery, do not slam a ball valve shut within one second. Use a slow-closing check valve or program the VFD to ramp down over 5 seconds. The oval gear meter can handle a short surge, but repeated hammer will damage rotors.
Viscosity compensation is often overlooked. Oval gear meters are factory calibrated with light oil. For HFO at 380 cSt, the K factor can shift slightly. Always specify the exact viscosity when you order. Silver Instruments adjusts the rotor clearance and calibrates with a fluid matching your operating viscosity. That gives you ±0.5% accuracy out of the box.
Frequently Asked Questions
Can the meter handle 50 m3/h with HFO viscosity of 500 cSt? Yes. A DN80 oval gear meter can handle up to 80 m3/h with 500 cSt. We recommend a maximum fluid velocity of 2.5 m/s for long life.
What output signals do I need for pump control? You need an open collector pulse output to a batch controller or a 4-20 mA signal to a VFD. Both options are available on Silver Instruments meters.
Is the meter approved for custody transfer? Our oval gear meters can be supplied with OIML R117 or national pattern approval certificates. They are accepted by customs and excise departments in many Southeast Asian and African countries.
How do I prevent solid particles from jamming the rotors? Install a Y strainer with 500 micron mesh upstream. For waxy or asphaltic HFO, heat the strainer jacket to 60 °C.
Can I get a complete skid with pump and meter? Yes. Silver Instruments offers pre-assembled metering skids with pump, strainer, air eliminator, control valve, and batch controller. Send us your pipe size (DN), flow range, pressure (bar), and temperature. We will provide a drawing and price.
Tell us your conditions. Send your heavy fuel oil flow range, viscosity (cSt or mm2/s), temperature (°C), pipe size (DN), and pump control logic to Silver Automation Instruments. Our engineers will recommend the right oval gear meter, temperature compensation method, and hazardous area certification. Visit flow-meter.com.au to see the full oval gear flow meter range or email your specification directly.
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