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Heavy Fuel Oil Flow Meter 5 m³/h: Auxiliary Feed Line Layouts and Meter Selection
Quick Answer: For a 5 m³/h heavy fuel oil (HFO) auxiliary feed line, select a heated oval gear meter or a Coriolis mass flow meter. The pipe layout must include a bypass loop, Y-strainer, thermal insulation, and air vents. Send your pressure, temperature, pipe size, and viscosity to Silver Automation Instruments to receive a data sheet with the exact model and a layout recommendation.
Why a 5 m³/h Auxiliary Feed Line Demands Proper Metering
Heavy fuel oil is not a light product. Its kinematic viscosity can reach 380 cSt at 50°C. Operators heat it to 90 to 130°C to keep it pumpable. Most auxiliary feed lines feed the boiler during startup or low load. A flow of 5 m³/h at 960 kg/m³ density equals around 4,800 kg/h. This is a small but critical line for burner control and fuel reconciliation.
If you put a standard turbine flow meter in this service, the sticky HFO wears down the bearings fast. We saw this happen at a power plant in Bangladesh. The maintenance team replaced the turbine internals every eight months. After they switched to a positive displacement meter with a heating jacket, the meter ran four years without a single failure. Technology choice and line layout go hand in hand.
Proven Technologies for 5 m³/h HFO Service
Oval Gear Flow Meter with Heating Jacket
The Silver Instruments OGF-DN25 oval gear meter covers 0.6 to 6 m³/h. It uses hardened steel gears and a PPS graphite seal rated for 200°C. A cast iron heating chamber wraps the measuring unit. You can feed it with low-pressure steam or use an electric cartridge heater. Add an integrated PT100 sensor and the transmitter gives you temperature readout over 4-20 mA HART. Accuracy stays within ±0.5% of reading even when viscosity swings between 100 and 1,500 cP. No straight pipe runs are required. Maintenance is simple: remove the cover, clean the gears, reassemble. Ship crews and boiler operators appreciate this design for heavy oil auxiliary loops.
Coriolis Mass Flow Meter for Direct Mass and Density
When billing accuracy matters, the Silver CMF025 Coriolis meter is the stronger choice. It measures mass flow directly in kg/h and ignores viscosity changes completely. The sensor tube is stainless steel 316L, and you can add an external thermal jacket. At 5 m³/h with a density of 960 kg/m³, the mass rate is about 4,800 kg/h, which sits comfortably inside the meter’s range of 0 to 15,000 kg/h. Mass flow accuracy is ±0.15% of rate, and density accuracy is ±0.5 kg/m³. The transmitter delivers Modbus, HART, and a scalable pulse output. Because there are no moving parts, mechanical wear is almost zero. The tradeoff is a higher purchase price and heavier weight.
Key Layout Rules for the Auxiliary Feed Line
Below is what a reliable layout includes, based on fieldwork in marine and power plant installations.
Bypass Loop. Fit a three-valve manifold or a simple bypass line around the meter. This lets your crew remove the flow meter for cleaning while the boiler stays online. Use full-bore ball valves rated for 16 bar and 200°C.
Y-Strainer Upstream. Mount a Y-strainer with 60 to 100 mesh immediately before the meter. HFO often carries coke fines and pipe scale. Those particles can lock the oval gears. Clean the strainer every two weeks during the first month, then monthly.
Air Vent at the High Point. Heating heavy oil creates vapor pockets that collect at the top of the line. Install a manual or automatic float vent at the highest elevation. This stops air-lock errors and protects the pump.
Heat Tracing and Insulation. Run steam tracing or self-regulating electric tracing along the entire pipe and the meter body. Apply mineral wool insulation at least 50 mm thick. Keep the HFO temperature above 70°C even during standby. If the oil cools and solidifies, restarting the line is a long job.
Pipe Orientation. Mount the oval gear meter horizontally with the gears turning in the ver
Pulsation Protection. If the pump is a reciprocating type, add a pulsation dampener upstream. Both oval gear and Coriolis meters tolerate moderate pulsation, but heavy surges reduce measurement accuracy.
Real Case: Vietnam Shipyard Solves Air Lock at 5 m³/h
Last year a contractor in Vietnam contacted us about a floating dock auxiliary boiler. The old gear meter ran dry every time the boiler switched to diesel during a weekend shutdown. With no air vent, the meter housing filled with vapor and the reading flatlined. We changed the layout: an automatic float vent was added at the highest point, and a check valve was placed downstream to keep the line flooded. We also supplied an OGF-DN25 with a heating jacket and PT100. After the fix, the flow signal returned to stable within two seconds of restart. The shipyard now uses this same arrangement on all new builds.
Quick Technical Comparison for 5 m³/h HFO Meters
Oval gear OGF-DN25: flow range 0.6 to 6 m³/h, accuracy ±0.5% of reading, heating jacket standard, output 4-20 mA HART plus pulse, process connection DN25 flange, typical material cast steel with hardened internals. Coriolis CMF025: mass flow range 0 to 15,000 kg/h, accuracy ±0.15% of rate, heating jacket optional, output HART and Modbus, process connection DN15 or DN25 flange, wetted parts 316L stainless steel, cost roughly three times higher. The oval gear meter wins on budget and simplicity. The Coriolis meter wins on precision and zero maintenance.
How to Order the Right HFO Meter from Silver Automation Instruments
Send an email with these data points to [email protected]: operating pressure (bar), heating temperature (°C), pipe size (DN), flow range (minimum and maximum in m³/h), viscosity at working temperature (cP or cSt), and power supply preference (24 VDC or 220 VAC). Our engineers will reply with a data sheet for the OGF or CMF series and a layout sketch specific to your auxiliary feed line. You can also visit flow-meter.com.au and download the oval gear flow meter catalog for heavy oil applications.
Frequently Asked Questions
Q: Can the oval gear meter handle HFO with viscosity over 380 cSt?
A: Yes. The OGF series handles up to 2,000 cP (roughly 2,200 cSt in heavy oil terms) after the oil is heated correctly. We have units measuring IFO 380 in the Philippines. All you need to specify is the heater jacket.
Q: What pressure drop happens across the meter at 5 m³/h?
A: At 5 m³/h and 200 cP, the pressure drop is less than 0.3 bar for the DN25 oval gear meter. For the Coriolis, it is near 0.5 bar. Both values are low for auxiliary feed pumps that typically deliver 10 to 16 bar.
Q: Do I need straight pipe runs for the meter?
A: The oval gear meter does not need any straight run. You can mount it directly after an elbow. The Coriolis specification often calls for 5D upstream and 2D downstream, but for a stable 5 m³/h line, even zero straight run usually causes no problem. We verified this on a barge installation with very tight piping.
Q: Can the heater jacket connect to my existing steam tracing?
A: Yes. Our jacket is a cast iron chamber with ½ inch NPT connections. You connect your steam supply (typically 3 bar) and a condensate return. For electric tracing, we supply a 100 W, 220 VAC cartridge heater with a thermostat control. Both options integrate without cutting the pipe.
Q: How do I prevent HFO solidification during long shutdowns?
A: Keep the tracing energised and the line pressurised. If you must drain the line, flush it with diesel before shutdown. We also recommend a small recirculation loop with a pump to keep the oil moving slowly. In your layout, include drain valves at the lowest point.
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