Help: Issue with liquid output from a storage tank – replacing vacuum with a pump!
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Help: Issue with liquid output from a storage tank – replacing vacuum with a pump! It is a 20-ton polypropylene storage tank, 5 meters in height. Previously, vacuum was used to extract methanol from the top of the tank; however, due to the low pressure resulting from vacuum extraction, which led to losses of methanol, it is now desired to switch to using a pump. But since the methanol in the tank has only just started to be used and there are no other containers available for transferring the liquid, it is not possible to drill holes at the bottom of the tank to connect a centrifugal pump. A self-priming pump is considered as an alternative, with the pipes using the existing vacuum pipes. The pump would be installed on the ground, at the same level as the bottom of the tank. I’m not sure if this approach is feasible If possible, what specifications should the self-priming pump have? Thank you!
The self-priming height should be around 6-7 meters, I guess
Hello! What is the self-priming height? Is it because my self-priming pump can’t be placed on the ground?
A self-priming pump with 304 material will suffice. The self-priming height refers to the distance from the pump’s inlet to the surface level; it is the height of the liquid level in the pipe relative to the pump’s inlet, and that is the self-priming height. The most common length is 2-3 meters, which should be fine.
Self-priming pumps can work, but your conditions are quite complex: your piping needs to enter the liquid level from above, which means the fluid flows around a U-shaped bend; this requires a very specific configuration for the pump
A stainless steel self-priming magnetic pump will do; a positive displacement pump can also be used, such as a pneumatic diaphragm pump, which already has self-priming capabilities. If the tank is under pressure, use nitrogen pressure
Complete nonsense. . . This pump is a vacuum self-priming pump (one that can replace bucket pumps). . No problem. . It’s better to use ordinary 304 material. . . It can meet the requirements. . .
Methanol has a low density and is flammable as well as volatile; could a self-priming centrifugal pump get empty? .