The relationship between the suction lift of a self-priming pump and its pipe diameter
Thread Content
We have just purchased a self-priming pump. The liquid level is less than 2 meters from the center of the pump. We chose a pump with a suction height of 3 meters; the pump’s inlet diameter is DN 25. For convenience, we used pipes with a diameter of DN 50, but this does not allow for the required suction height. Therefore, we would like to ask what relationship exists between a pump’s suction height and its pipe diameter
The suction height of a pump has little to do with the inlet piping; by changing it from DN25 to DN50 as you suggested, this phenomenon will not occur. The suction height of a self-priming pump is influenced by factors such as the seal gap in front of the impeller, the speed of rotation of the pump, and the liquid level in the separation chamber
I don’t think it has anything to do with this either. Is it related to the power of the pump?
This is related to the diameter of the inlet pipe; self-priming pumps all have a water tank. If the inlet diameter is too large, it will result in insufficient mixing of air and water, and thus the pump will not be able to prime itself
After testing, there is indeed a relationship. Thank you all, teachers; I just don’t know the specific calculation formula
In my opinion, a pump’s self-priming capability and pumping speed are related to the vacuum level; the original poster might want to try using a pump with a greater self-priming height. Will it be possible to achieve self-priming now if you switch back to an inch-sized pipeline?
In my opinion, it’s still related to the pipe diameter~~ The power requirement of a 25mm pump is fixed; when switching to a 50mm pipe, the self-priming height naturally decreases.
The self-priming height of a self-priming pump is related to factors such as the seal gap in front of the impeller, the pump’s rotational speed, and the liquid level in the separation chamber. The smaller the seal gap in front of the impeller, the greater the self-priming height. Typically, the installation height of the suction inlet is around 5 meters; your pump has only 3 meters, which is relatively low. Whenever possible, the installation height of the suction inlet should be as low as possible, and the length of the suction pipe should be shortened as well as fewer elbows should be used. This helps to reduce the self-priming time and improve the self-priming capability. The diameter of the suction pipe for a self-priming pump must not exceed the specified limits, and the total length of the suction pipe shall not be more than 5 meters; the shorter it is, the better, provided that all requirements are met. A filter screen must be installed at the bottom of the inlet pipe to prevent large particles or debris from entering the pump and damaging the impeller or affecting its operation; the filtering area should be 3-4 times larger than the cross-sectional area of the pipeline.
It has nothing to do with wood; theoretically, it’s unrelated. It’s possible that there’s a leak in your suction pipeline, or the inlet is blocked. Atmospheric pressure can support a water column of 10.336 meters, while the suction height of ordinary pumps is around 4 meters
It is definitely related to the pipe diameter; you can tell by looking at the structure of a self-priming pump.
Let’s have an active discussion! I might soon have to deal with this design. A new factory needs to be built, and the diameter of the underground tanks is 3 meters; after installation, the bottom of these tanks will be at a depth of about -3.7 meters. To pump up alcohol, I need to decide which type of pump to use – a pump with an inlet diameter of 50 should suffice. Please give your support.