Can the inlet and outlet pipelines of a pump be used as a circulation line?
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As the title suggests, if the inlet and outlet pipelines of a pump are connected together (that is, with a cross-connected pipe in between), can it be used as a circulation line?
It’s possible; just the location where it connects to the inlet pipe needs to be considered. Our heat transfer oil pipelines are connected to the inlet and outlet pipes entering the workshop, and are arranged in accordance with the valves.
All the loop lines I’ve seen go all the way to the bottom of the container
Heat transfer oil works fine; but if liquefied hydrocarbons are used, isn’t it easy for them to vaporize?
It is necessary to consider the connection location, placing it a bit farther away from the pump inlet.
It is necessary to consider the connection location, placing it a bit farther away from the pump inlet.
According to what you’ve said, it’s definitely not possible; when a pump does work, part of that energy is converted into internal energy, which raises the temperature of the liquid. In the case of centrifugal pumps, the intense stirring of the liquid causes cavitation in the pump
All heavy oil pumps do this (for preheating purposes); liquefied gas pumps (high-speed pumps) also have such a feature, in order to regulate the flow rate. We call it the reverse can line
The poster is referring to mechanical pumps, which are not suitable for being connected to the bottom of a container
Liquid hydrocarbons are also no problem; as long as the pressure at the pump inlet is not too low, they will not vaporize