The problem of axial force in centrifugal pumps
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Does pump evacuation cause an instantaneous increase in axial force?
It depends on the situation. If the container is connected to the atmosphere after being evacuated, then no such issue will occur. If it’s a sealed container, evacuating it will result in an increase in axial force, but this increase won’t happen instantly; it will grow gradually as the liquid level in the container drops. However, pumps are usually equipped with balance pipes, and the presence of such pipes helps to mitigate this problem.
After the pump is evacuated, it depends on the type of pump: centrifugal pumps can cause vibrations and an increase in axial forces； Magnetic drive pumps or shaft displacement pumps generally should not be emptied, as this can cause damage to the pump rotor.