Question: Does a centrifugal pump draw in air at the moment it starts?
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At the moment a centrifugal pump starts up, negative pressure is created at the inlet; could external air then leak in through the inlet and outlet flanges or the mechanical seal?
Generally not, or it may enter in small amounts. If it does not affect production, then it’s okay; but if the leakage is severe enough to impact production, then it’s not acceptable. For water pumps alone, if they are used with special process media, special protective structural facilities are required. For reference.
Generally, this won’t happen, because before starting the pump, it is necessary to open the inlet valve to fill the pump and remove air from it. During debugging, a rotation check of the pump is also carried out; if a leak is detected in the valve of the pump’s inlet pipe, it must be fixed first!
There definitely is, but the amount is very small. If it were to the point of affecting the pump’s operation, it would mean that the inlet flange is leaking after the pump is stopped
It won’t happen at the moment of startup; if it did, the pump would already be leaking before startup, and you would be able to notice that