What are the consequences of the pump running in reverse?
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This post was last edited by lovestory on 2010-12-31 20:58. What are the consequences of reversing the pump?
This may cause the cap that fixes the pump impeller to the pump shaft to become loose, resulting in a loose fixation of the pump impeller; this can lead to friction or even collision between the pump impeller and the pump casing, thereby causing damage to the pump.
The last edit to this post was made by lovestory on 2010-12-31 at 21:00. Reply 1# arespx: First, it’s necessary to determine what type of pump you are referring to – one type is a centrifugal pump, and the other type is a positive displacement pump (such as gear pumps or screw pumps). If it’s a centrifugal pump, it’s possible that the cap used to fix the pump impeller to the pump shaft could become loose, resulting in a loose fixation of the impeller. This could lead to friction or even collision between the impeller and the pump casing, thereby damaging the pump. If it is a gear pump, a small oil pump is no problem. Large pumps also have lock nuts at the pump shaft end; if rotated in the opposite direction, these nuts will become looser, preventing the pump from rotating. It is best for screw pumps not to be able to rotate in reverse.
I’ve learned it; what about a vacuum pump?
Reply to 5# caocheng: One consequence of the pump running in reverse is that the inlet pipeline may experience overpressure. Therefore, per the specifications, the pump inlet pipeline (from the pump inlet to the nearest valve) should be designed with the same pressure rating as the outlet pipeline.
Reply to 3# Hebei Hengsheng Pump Industry: What you said is basically correct, but we have used several rotor pumps in one of our projects – they had 3\" connections, with feeding occurring in reverse rotation and discharging in forward rotation – and it seems no problems arose as a result.
If reversing causes the pump pressure to drop, it will not meet the requirements
Reply to 5# caocheng: A vacuum pump can cause the inlet and outlet to be reversed, which means it cannot draw in air
If the pump cannot deliver fluid, the impeller may become loose, leading to damage to the pump
This post was last edited by cautonlur on 2011-1-1 at 11:59. For example, what happens to a centrifugal pump used for reflux in a tower when the fluid flows back from a height of more than ten meters, or even higher? The cap may loosen, the mouth ring can deform, the shaft may bend or even break, and the dry gas seal ring that cannot be reversed will crack..........