heavy fuel oil flow meter DN150

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## Quick Answer For measuring heavy fuel oil (HFO) in DN150 (6-inch) pipelines, the most reliable options are oval gear flow meters and Coriolis mass flow meters. Oval gear meters offer direct volumetric measurement with high viscosity tolerance (up to 100,000 cP), while Coriolis meters provide mass flow, density, and temperature in one device. For DN150 HFO applications, typical flow range is 10–200 m³/h at 40–80°C, with line pressures up to 16 bar. --- ## Why Heavy Fuel Oil Flow Meter Selection Matters for DN150 Pipelines Heavy fuel oil presents specific challenges. It is viscous (typically 180–700 cSt at 50°C), it contains abrasive particles, and it needs preheating (40–80°C) for pumping. A DN150 pipe operating at 2–4 m/s flow velocity moves roughly 60–180 m³/h of HFO. The wrong flow meter will jam, drift in accuracy, or fail within weeks. At Silver Instruments, we supply flow meters to power plants in Thailand, bunker fuel terminals in Singapore, and marine fuel transfer systems in Indonesia. Most DN150 HFO applications we see are onshore receiving stations, boiler feed lines, and intertank transfer. The meter must handle high viscosity at start-up and lower viscosity at operating temperature. ## Three Meter Technologies Proven for DN150 HFO ### Oval Gear Flow Meter (Positive Displacement) This is the most common choice for DN150 HFO. Oval gear meters trap fixed volumes of fluid between rotating gears. They measure volume directly with no slip. They tolerate viscosities from 30 to 100,000 cP. For DN150, we typically recommend the LS-OGF series with an accuracy of ±0.2% reading. **Real case:** A boiler fuel supply system in Jakarta used an oval gear meter on DN150 HFO l heavy fuel oil flow meter DN150

ine at 80°C, 10 bar. The meter ran 18 months with zero maintenance. Accuracy drift stayed under 0.3%. **Limitations:** Oval gear meters have moving parts. If the HFO contains sand or catalytic fines (cat fines), gear wear accelerates. Install a Y-strainer with 600 micron mesh upstream. Pressure drop across the meter is 0.3–0.8 bar depending on viscosity. ### Coriolis Mass Flow Meter Coriolis meters measure mass flow directly using vibration tubes. They ignore viscosity changes and density variation. For DN150, we recommend the SI-CMF series with DN150 flanged body. It provides mass flow, volumetric flow (derived from density), density, and temperature. Accuracy is ±0.15% for mass flow. **Customer feedback:** A marine bunker operator in Surabaya switched from a differential pressure meter to Coriolis for custody transfer. The density measurement revealed that their test reports from the supplier differed by 1.2% from actual. They began billing on mass basis. **Selection note:** DN150 Coriolis meters are large. Check pipe support. The meter weighs about 40–80 kg depending on material. Also check that the electronics enclosure is IP67 for outdoor installation. ### Ultrasonic Flow Meter (clamp-on) Clamp-on ultrasonic meters are non-invasive. They attach to the outside of the pipe. For DN150 HFO, use a transit-time sensor with high signal power. Because HFO attenuates ultrasound (viscous), the meter must have high-gain transducers. We recommend the SI-TUF series with clamp-on sensors. **When to use:** For retrofits where pipe cannot be cut. For temporary measurement. When the HFO is too dirty to risk an inline meter. **Problem we see often:** Customers buy cheap ultrasonic meters. The sensors lose signal when viscosi

heavy fuel oil flow meter DN150

heavy fuel oil flow meter DN150

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