Relationship between pump inlet pressure and the vaporization pressure of the medium
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Question: Should the inlet pressure of the pump be lower than or higher than the vaporization pressure of the medium? Also, how should the vaporization pressure be understood?
It should be higher; if it is lower than the vaporization pressure of the medium at its current temperature, the medium will vaporize, which will cause pump cavitation and prevent liquid from being drawn up.
The vaporization pressure is higher than the operating temperature of the medium, and it meets the requirements for pump net positive suction head.
The vaporization pressure should be the boiling point of the medium at that temperature
It should be the vapor pressure at that temperature
Of course it should be higher. It will vaporize if the temperature is too low. It should not only be higher but also have a margin of 0.3–0.5; the original poster can refer to the section on pump installation height in the book \"Principles of Chemical Engineering\" for details.
The pump inlet pressure should be higher than the saturated pressure of the medium at the operating temperature, plus the pressure loss in the inlet pipeline, plus 0.6~1.0 meters of liquid column