Regarding siphon stabilization operation
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Xiaobai, I have a question: to transfer clean water from tank A to tank B, using the difference in liquid levels and siphon pipes installed at both ends, even if the water tanks are 5 meters high and the water temperature is 25°C, will it be sufficient to install an air release valve and a vacuum pump valve at the top of the siphon pipes? I’m concerned about whether the siphon pipes will function stably, and also whether the water in the pipes might gradually flow away after operation stops, leading to frequent vacuum pumping operations. Any experienced experts, please share your insights. .
It would be best to include a simple diagram for reference, to facilitate discussion.
Well, it seems I’ve already explained it clearly; let me add one more condition: the two tanks should be 8 meters apart, and the ratio of the diameter of the siphon pipe to that of the tank’s diameter should be very small.
The graph above allows for an analysis of the impact of liquid level height on siphoning; to draw conclusions, it is necessary to use relevant formulas for calculation. It is recommended that the chapter on fluid transport in the book \"Principles of Chemical Engineering\" include an introduction to this topic. It’s worth a look.
The key here is the process or diagram! ! Only then can we discuss whether your plan is reasonable or feasible; otherwise, detailed calculations can only be carried out based on your diagrams, and it is even only by referring to those diagrams that we can determine how to proceed in order to avoid the problems you are concerned about, and so on!
A siphon requires a height difference in liquid levels! You need to explain clearly how to arrange it!
Siphoning relies on a difference in liquid levels; how can there be suction if there’s no liquid level at all? Do you think it’s a vacuum pump?
First, open the vacuum valve to create negative pressure and induce siphoning, then close the vacuum valve； After the siphoning is complete, opening the air release valve will terminate the siphoning process. Next time during siphoning, close the air-break valve again and open the vacuum valve
I think the same way. I’m worried about whether it’s possible to maintain a negative pressure level for an extended period of time, such as -70 kPa. Will materials like stainless steel pipes, male/female flanges, PTFE-lined gaskets, and soft-sealed ball valves work for this purpose? .
Once a siphon is formed, it is necessary to close the vacuum pump valve promptly; there is no need to worry about damage to the pipes. The siphon height is only 5 meters (check whether the liquid level difference between the two sides is indeed 5 meters), with a pressure difference of only 0.5 Kg