Is it not ideal to have a sewage pump inlet with a diameter of DN50 at the bottom of the reflux tank, while the inlet pipeline has a diameter of DN40?
Thread Content
Generally, the diameter of the inlet pipeline is larger than that of the pump’s inlet. But for a certain pump, a DN40 inlet pipeline is sufficient according to the hydraulic calculations. However, the specifications provided by the manufacturer indicate that the pump’s inlet diameter is DN50, and since it’s a standardized product, this cannot be changed. I once read a post saying that it’s not good when the inlet pipeline is smaller than the pump’s inlet, but it wasn’t clear exactly why. I would appreciate it if someone could advise me on whether this approach is acceptable. O(∩_∩)O Thank you
A pump is a standardized product with its own design characteristics. Especially for centrifugal pumps, the suction height is quite limited; therefore, the inlet diameter is generally slightly larger than the outlet diameter. Given your operating conditions, you can choose a pump with appropriate specifications; there is no need to design a pump specifically to meet those requirements, as that would significantly increase the cost of the installation. Just as a person’s mouth is sufficient at 4 centimeters for eating and talking, but now it is 4.5 centimeters – is it really necessary to remove those 0.5 centimeters?
For example, if you want to eat 5 liang of rice, use a lunchbox that can hold 1 jin – then you can simply put 5 liang of rice in it. If you use one that can only hold 1 liang, you’ll have to measure the rice five times. . .
It’s actually a matter of matching the two different solutions: one is DN40 as determined by hydraulic calculations for pipelines, while the equipment selected offers only DN50. Note that this is a sewage pump, which means it may be heavier or have a higher viscosity than water used in normal applications. Have the hydraulic calculations taken this into account? I think it’s better to try to meet all the requirements of both; a larger pipeline can’t hurt, right?
It should work; when in use, the pump outlet valve can be turned down a bit :)
The pipeline should not be smaller than the pump inlet. The change in diameter generates eddies, causing the pump to easily become clogged.
Dude, where does this claim come from? You need to back it up with solid evidence as the reviewer asked. .