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Bunker C fuel oil, or residual oil, has an economic trade off associated with its use. Its lower cost is tempered by a higher viscosity which makes it more expensive and difficult to handle.

Once the light hydrocarbon components have been distilled from a barrel of oil, the high viscosity residue has few practical uses. The higher the viscosity, the harder it is to further process the oil such that the cost of your fuel is inversely related to the viscosity of the oil.

Higher viscosity materials require preheating to reduce their viscosity within a pumpable range, but heat used for lowering the viscosity is energy lost from the process. By using a flow meter that is capable of accurately measuring high viscosity fluids, the preheating requirement is reduced. Fuel oils in the 500 to 5000 cps range are no problem for Max Machinery's G Series of flow meters.

Max has an entire line of high resolution gear meters with wide range linearity and low flow rate measuring capabilities. For any size burner, there is a Max meter which will improve your control for optimal efficiency.