When using a pump to draw pressurized liquid from a pipeline, is it still necessary to add air?
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If the liquid in a sealed pipe or container is under pressure, is it necessary to apply additional pressure when pumping the liquid out with a pump? For example, in a pipe under a pressure of 2 kilograms of water, with a pump used to draw water out, is it necessary to supply additional gas?
Considering the process conditions, if it operates continuously and vacuum is not applied, “air needs to be added”!
It depends on how much you plan to extract. Initially, there is a positive pressure of 2 kilograms; after using a pump to draw liquid out, the pressure drops to normal levels. If extraction continues, negative pressure is created. Once the negative pressure inside exceeds the pumping capacity of the pump, it becomes impossible to draw any more liquid out. If it is necessary to pump out everything, it is required to open a vent; such devices that operate under positive pressure are designed to have a pressure transducer, which is used to determine whether to open the vent at normal pressure or under slight negative pressure