How to select a model for priming a centrifugal pump
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The selection charts provided by pump manufacturers generally show the performance curves for clean water at 20 degrees Celsius. Now that the medium is hydraulic oil, how should one choose the appropriate model? Considering the water conditions and choosing options on a larger scale – would that not be too imprecise? . .
For oil-based jokes, it depends on the viscosity of the oil. If the viscosity is not high, increasing the power of the motor will suffice; if the viscosity is too high, a gear oil pump is a suitable choice
As I mentioned in my post, the question is as to what size the motor should be. It involves model selection.
Our company uses gear oil pumps for lubricants, and generally pays attention to the flow rate of the lubricant required
Oil, right. . For high viscosity, pay attention to viscosity conversion and also consider specific gravity. . .
Hydraulic oil is generally pumped using gear pumps or piston pumps
Hydraulic oil generally has a higher viscosity, so using a centrifugal pump is not the most suitable choice. It is recommended to improve parameters such as specific flow rate, head, and oil temperature; a reference solution can be provided
If the viscosity is 20 cSt or less, no correction to the clear water curve is considered. Beyond this range, it is necessary to refer to the performance correction table to apply corrections to head, flow rate, and efficiency.
For transporting hydraulic oil, gear pumps or screw pumps are the best choices. Centrifugal pumps are very sensitive to the viscosity of the fluid, and this sensitivity leads to significant variations in performance; they are generally used for transporting fluids similar to water, such as gasoline and diesel. Therefore, it is recommended to switch to a different type of pump. If a centrifugal pump must be used, the theoretical formulas are not accurate, so actual testing under real operating conditions is necessary. In contrast, gear pumps or screw pumps can provide precise values for flow rate and pressure, with little deviation from the actual values, making them highly suitable for this purpose
If accuracy and stability are required, it is recommended to use a metering pump, as it can meet such requirements
Based on our experience, the stability and accuracy of gear pumps can be ensured; in other words, as long as the rotation speed of the gear pump is kept constant, the flow rate will remain unchanged