Can the inlet pressure of a centrifugal pump be negative?
Thread Content
The vacuum condenser of the turbine is under negative pressure; is the pressure at the inlet of the condensate transfer pump positive or negative? I appreciate your advice, thank you
It can be negative pressure; when the pump is operating, the pressure at the pump inlet should be lower than the pressure inside the tank!
It can be negative pressure; in most vacuum distillation towers here, the inlet is at negative pressure.
Does that mean the pressure at the pump inlet is lower than that inside the tank, and it is only under this pressure difference that pumping can take place properly?
Thank you. Then why is there a requirement for the height distance from the bottom of the container to the pump inlet?
Reply to 4# Li Yang—The vacuum condenser of the nm turbine is under negative pressure; the inlet pressure of the condensate transfer pump is also negative. However, the pressure at the inlet is higher than that in the condenser, as the center level at the inlet of the condensation pump is usually 1-2 meters lower than the liquid level in the condenser’s collection tank
This post was last edited by gmdyes on 2011-7-3 at 13:24. For reference, see http://bbs.hcbbs.com/viewthread.php?tid=583708 – different people have different opinions
Thank you, that makes a lot of sense. Thank you very much; our height is 2 meters lower
It can be negative pressure! ! ! ! ! ! ! !
Of course it’s negative pressure. How high that negative pressure can reach depends on the performance of the pump itself
Inlet pressure = static pressure due to the difference in liquid level heights + negative pressure inside the container; determine whether it is positive or negative.