If the minimum flow line of the pump returns to the bottom of the tower or tank, is it better to have it above the liquid level or below it?
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I still don’t quite understand the difference between being above the liquid surface and below it. Please give me some guidance, O(∩_∩)O Thank you
There is a difference; the usual setting is to return the fluid above the liquid level. The purpose of this is to ensure thorough exhaust when starting the pump, as well as to reduce the pressure in the minimum reflux line.
What was said upstairs is already very accurate.
It is to ensure proper exhaust when starting the pump, as well as to reduce the pressure in the minimum return line. 1. Having the return line below the liquid level ensures that the entire pipe is filled with liquid, thus minimizing the presence of gas. 2. If it’s above the liquid level, the pressure is that of the gas phase inside the tank; if it’s below the liquid level, it’s the pressure of the gas phase plus the pressure of several meters of liquid column – which is usually not a significant amount at all. What do you think, buddy?
There’s nothing to say about the 50160 at the end; I agree. As for what was said earlier, I don’t think there will be any flashing. . The liquid entering the pump is generally in vapor-liquid equilibrium; as it moves further down, it becomes supercooled. After pressurization, it passes through an orifice plate for pressure reduction, and the pressure after this reduction is still higher than the pressure in the gas phase space at the inlet, so it remains supercooled as well
Volatile liquids or flammable and explosive liquids should preferably be kept below the liquid surface to reduce static electricity and evaporation； If it is other materials with no hazards or special requirements, it can be on the liquid surface.
Volatile liquids or flammable and explosive liquids should preferably be kept below the liquid surface to reduce static electricity and evaporation； If it is other materials with no hazards or special requirements, it can be on the liquid surface.
Between a liquid and a solid, between a liquid and a gas, or between a liquid and another immiscible liquid, relative movements of contact and separation such as stirring, sedimentation, flow, impact, and splashing, along with differences in the work of electron emission among the substances, lead to the formation of double layers and thus the generation of static electricity. Most liquid chemical products are highly insulating materials; therefore, during the production, storage, and transportation of such non-conductive liquids, a large amount of static electricity is generated and accumulated. When this static charge reaches a certain level, it can cause spark discharge. If explosive mixtures are also present in the same area, it may lead to fires or explosions.
The inlet pipelines returning to the tank are more commonly used