Overload problem of mechanical pumps
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What to do if a fuel oil pump is overloaded? The operating condition is a fuel oil density of 1.03 ； Pump 8 cubic/h ； Head 120 meters ； Inlet DN50 Outlet DN40 ； Is there a good way to avoid replacing the pump? Thanks for the advice
Is it due to a selection issue or some other reason? Regarding the selection issue, one can replace it with a new motor or one with a larger capacity; using a cutting impeller is also an option ； If it is due to other reasons: 1. Excessive load ； 2. The motor voltage is too high or too low ； 3. Prolonged exposure of the motor to moisture or corrosive gases can lead to a decrease in insulation resistance ； 4. Lack of oil in the motor bearings, dry friction, or misalignment of the rotor mechanism cause the motor current to exceed the rated value ； 5. Failures in the mechanical transmission part, etc.
I personally think it’s because the viscosity is too high. It’s to the point that I can’t move around at all
If there are no mechanical issues, increasing the temperature of the fuel oil appropriately to reduce its viscosity can help lower the current level. Also, what kind of heavy oil is this with a density of 1.03? Is it too heavy?
What is the power of the accompanying motor? The operating current is too low. Is it a vertical pump or a horizontal pump? Having the data will make things easier
Options to consider: replace the motor, reduce the head, reduce the flow rate, or lower the density
If you don’t want to replace the pump, you could consider replacing the motor instead! Increase the motor power, or determine the flow rate and head in conjunction with the process; if there is a surplus, a impeller can be used to reduce the motor power!
Using a gear pump or screw pump will solve the problem
Positive displacement pump or centrifugal pump? Given that it has a high head and low flow rate, it resembles a positive displacement pump; is this overload caused by too high an outlet pressure (back pressure) and too low an inlet pressure? If it is a centrifugal pump, what type of pump is it? Vortex pump?