heavy fuel oil flow meter DN80

『heavy fuel oil flow meter DN80』Related information(flow rotameter|digital flow meter|balo meter|hydraulic flow meter|volumetric meter|positive displacement meter|pitot tube flow meter|displacement meter|cfm meter|variable area flow meter|inline flow meter|differential pressure flow meter|calibrated flow meter|velocity meter|paddle wheel flow meter|oval gear flow meter|anemometer hvac|multiphase flow meter|doppler flow meter|thorpe tube flowmeter|heat flow meter)

# Oval Gear Flow Meters for Diesel: How to Get Accurate Measurement Under 0.1% **Quick Answer:** Oval gear flow meters are the best choice for diesel flow measurement when you need accuracy under 0.1% and can handle diesel’s lubricating properties. These positive displacement meters work by trapping fixed volumes of fluid between two rotating gears. For diesel applications, expect working pressures up to 100 bar, viscosities from 0.5 cP to 10,000 cP, and temperature ranges from -20°C to +150°C. Silver Instruments supplies oval gear meters with 4-20 mA HART output for direct tanker loading and engine test stands. ## Why Oval Gear for Diesel Diesel fuel has low viscosity, around 2 to 4.5 cP at 40°C. That is thinner than heavy fuel oil but thicker than gasoline. Many flow meter technologies struggle with diesel. But oval gear meters handle it well. Here is the key reason: diesel is lubricating. Unlike water or solvents, diesel provides enough lubrication for the gears to seal against the chamber walls. This means minimal slip, which is the leakage between gears and housing. Less slip means better accuracy. Most engineers skip this part: the clearance between gears and housing in an oval gear meter is typically 10 to 30 microns. That is about half the width of a human hair. For diesel, this tight clearance combined with fuel lubricity gives you accuracy down to 0.1% of actual flow. ## How Oval Gear Meters Work Two oval shaped gears rotate inside a precision chamber. Liquid enters the inlet, pushes the gears, and gets trapped in the space between the gear teeth and the chamber wall. Each rotation displaces a fixed volume. A magnetic pickup or Hall effect sensor detects the gear rotation and sends pulses to a flow compu heavy fuel oil flow meter DN80

ter or totalizer. The number of pulses per liter is the K factor. For a DN15 oval gear meter, expect around 1000 to 1500 pulses per liter for diesel. The output is typically a frequency signal sent to a local display or a 4-20 mA transmitter for remote monitoring. Many meters also have an HART protocol for integration with DCS systems in refineries. ## Diesel Application Scenarios We see oval gear meters used in three main diesel applications. **Tanker truck loading and unloading.** A customer in Malaysia loads diesel into tanker trucks at 150 L/min. They use a DN40 oval gear meter with a mechanical register and pulse output. The meter connects to a batch controller that automatically stops flow when the preset volume is reached. Accuracy is 0.15% over the entire flow range. **Engine test stands.** Last year a diesel engine manufacturer in Thailand asked us for a meter that could measure fuel consumption at varying flow rates between 5 and 200 kg/h. Their test cycles include sudden acceleration and deceleration. Oval gear meters respond almost instantly because they measure volume directly without any signal processing delay. We recommended a DN15 meter with PT100 temperature compensation because diesel density changes with temperature. At 25°C, the density is roughly 840 kg/m³. At 40°C, it drops to 820 kg/m³. If you ignore temperature, your mass flow measurement error can reach 2.5%. **Marine bunkering.** A marine fuel supplier in Singapore needed to measure diesel delivered to ships. The diesel viscosity at bunkering temperature was about 3.5 cP. They tried a Coriolis meter but the high initial cost was a problem for their 10-person company. We supplied a DN50 oval gear meter with a strainer and deaerator. The s

『SILVER Official Website SERVICE』