crude oil flow meter DN25

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# Coriolis Mass Flow Meter for Bunker Fuel: Key Specs and Selection Guide **Quick Answer:** Coriolis mass flow meters are the most accurate choice for bunker fuel measurement, typically achieving ±0.1% to ±0.15% accuracy. For HFO (heavy fuel oil) with viscosity up to 700 cSt at 50°C, choose a meter with 316L stainless steel or hastelloy C-22 wetted parts. Our Silver Instruments Coriolis meter can handle temperatures from -200°C to +350°C and pressures up to 400 bar. Send us your expected flow range (kg/h), fuel type (HFO, MGO, or VLSFO), temperature, and pressure for a specific model recommendation. ## Why Bunker Fuel Needs a Coriolis Meter Bunker fuel is not water. Heavy fuel oil (HFO) at bunker terminals in Singapore or Fujairah can have viscosity above 380 cSt. Very low sulfur fuel oil (VLSFO) behaves differently than marine gas oil (MGO). These differences matter. Most engineers skip this part: volumetric flow meters like oval gear or turbine meters measure volume, but bunker fuel density changes with temperature. A tank loaded at 25°C in Dubai and discharged at 15°C in Rotterdam shows different volumes. The actual mass of fuel stays the same. Coriolis meters measure mass directly. No density compensation needed. No temperature correction formula. This is why maritime authorities and bunker surveyors in major ports prefer them. A ship owner in Greece told us last year: "we used to have 0.5% discrepancy between our figures and the suppliers. With Coriolis, it dropped to 0.1%." ## Key Specifications for Bunker Fuel Applications ### Accuracy Class Standard Coriolis meters give ±0.1% for liquids. Some manufacturers claim ±0.05% for ideal conditions. For bunker fuel transfer, ±0.15% is acceptable for custody trans crude oil flow meter DN25

fer. Our CMF series achieves ±0.1% across 20:1 turndown. ### Viscosity Range Bunker fuels range from 2 cSt (MGO) to 700 cSt (HFO 380). Coriolis meters handle this without any viscosity correction. Oval gear meters would leak at low viscosity. Ultrasonic meters struggle with heavy fuel. Coriolis keeps working. ### Temperature HFO must be heated to 50°C to 60°C for pumping. Some bunker lines operate at 80°C. The meter needs PT100 sensors rated for these temperatures. Silver Instruments Coriolis meters include integrated temperature measurement through the sensor tubes. ### Pressure Rating Bunker fuel lines run at 10 to 16 bar typically. But some engine feed systems use 30 bar. Choose a meter rated for at least 1.5 times your maximum operating pressure. ### Materials HFO contains vanadium, sodium, and sulfur. 316L stainless steel works for most applications. For aggressive fuels or high sulfur content, hastelloy C-22 is better. Carbon steel flanges are standard on larger line sizes. ## Installation Guidelines for Bunker Fuel Coriolis meters need proper installation. Here is what we have seen on customer sites many times: **Mounting position.** Install the meter vertically with flow going upward. This allows air or gas bubbles to pass through. In horizontal piping, mount with tubes oriented sideways, not up or down. Condensation in the electronics housing kills the transmitter. **Straight pipe runs.** Coriolis meters do not need straight runs upstream or downstream. This is different from ultrasonic or vortex meters. But do not install directly after a control valve or pump discharge. The vibration affects zero point stability. **Air elimination.** Before the meter, install an air eliminator if your fuel line ha

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