Suction head of centrifugal pump
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May I ask, do all centrifugal pumps have a certain suction lift? We have a project that involves two centrifugal pumps used for handling wastewater; they are quite common pumps. It has been found that after installing a priming tank, these pumps almost have no suction lift. The manufacturer claims that pumps of this type do not have any suction lift. My understanding is that as long as it’s a centrifugal pump, it should have a certain suction lift; the manufacturer isn’t trying to deceive me.
It is true that centrifugal pumps do not have a suction lift
Suction pumps have a suction lift, while centrifugal pumps do not
It should be like this for a self-priming centrifugal pump to have a certain suction lift.
It is incorrect to say that a centrifugal pump has no suction lift; suction lift and self-priming height are not the same thing. Unless it is a centrifugal pump with an NPSHr greater than 10 meters,
A centrifugal pump equipped with a priming tank is even more powerful than a self-priming pump you might buy; the height of the suction lift is directly proportional to the size of the priming tank. Make sure it’s sealed properly to prevent air leaks!
This post was last edited by wyf600 on 2015-11-30 at 11:00. The water collection tank has now been made quite large; isn’t a too-thick inlet pipe also detrimental to pumping water in? The design of the water intake tank should be fine at present, as it has been designed in the same way for other projects and has worked well there. It’s currently difficult to determine whether the water intake tank (including the entire pipeline) is leaking, as it’s not possible to inspect it. Shouldn’t all centrifugal pumps be able to draw water from a certain height? Currently, the pump operates normally when it can fill itself with water; yet as soon as the water level drops below the pump’s inlet, it can no longer draw water.
Does that mean that all centrifugal pumps have a certain self-priming height? My current understanding is that it should be fine to draw water from a depth of 3 meters using self-priming pumps; I’m not sure if this has anything to do with the type of centrifugal pump used. I can operate normally under self-priming conditions, but as soon as the water level drops below the pump’s inlet, no flow is generated.
Suction pumps have a suction lift, while centrifugal pumps do not
A self-priming pump is probably just a type of centrifugal pump.