Can the diameter of the centrifugal pump’s outlet pipe be smaller than the pump’s outlet?
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Can the diameter of the centrifugal pump’s outlet pipe be smaller than the pump’s outlet? The pump outlet is DN40; is it okay to use DN25 piping?
This post was last edited by ylb913 on 2016-1-2 at 20:58. A very short neck doesn’t necessarily mean there will be a problem; it’s similar to a control valve at the pump outlet – just make sure the pump body (or rather, the fluid inside the pump) doesn’t overheat. However, this is generally not done; instead, the diameter is increased to reduce the flow velocity. This is to reduce the head required of the pump and save electricity, and secondly to avoid erosion caused by corrosive media.
It’s possible to do it by changing the diameter at the ends, but this is generally not done.
Is the pump too large? Isn’t that a waste? And the liquid speed is too fast
It generally increases in size; it’s not impossible for it to decrease, but this must be done while ensuring the pump operates properly.
It should work! The prerequisite is to ensure an unobstructed exit route.
It was originally designed for DN40; now it’s DN25. The efficiency of the pump has decreased. As long as the pump’s temperature doesn’t rise too much, there’s no problem, but more electricity is consumed
Flammable and explosive hazards; static electricity can easily lead to explosions. Such as toluene, propyl derivatives. If the original poster is the one transporting the water, it doesn’t matter.
Sure! However, after the diameter is changed, the flow rate no longer reaches the pump’s designed value; it’s better to replace the pump as well
This post was last edited by Grizzly on 2016-1-3 17:53. Generally, such a practice does not exist. Fluid energy = velocity head + elevation head + static pressure head. Assume the outlet is very short and the draft does not change. At this point, energy is converted between velocity head and static pressure head. We generally prefer a relatively high static head (of course, not exceeding the design pressure), rather than a very high velocity head. Because a large velocity head results in increased drag losses. For this issue, you can also understand it in relation to the forward and backward curvature of the impeller. So, not only will we not reduce the diameter, but we will also increase it.