The issue with pump inlet pressure
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There is a backflow-proof sealed tank at the pump inlet; the liquid level is 4 meters high, and the medium is water at 108 degrees Celsius； I would like to ask: is the inlet pressure of the pump equal to the static pressure plus the saturated pressure of the steam? Also, how is cavitation in the device calculated? Thank you
It is recommended to get a copy of \"Principles of Chemical Engineering\" and study it; it is a fundamental textbook for chemical engineering operations. After watching it, your question will be solved.
Could you help solve the current problem?...... Thank you very much
I’m giving you an answer in good faith, because your question is completely absurd. For example, is your 108°C water at atmospheric pressure or something else? At atmospheric pressure, this is supersaturated water that is constantly vaporizing; cavitation in such a liquid within a pump is entirely possible. Also, the saturation temperature of water decreases as pressure increases, right? It’s not just what you’ve mentioned that can solve this; it involves many physical principles. The book has two chapters: Thermodynamics and Fluid Transport. It should basically solve your problem. It’s recommended to find someone with design qualifications. If you really have to do the calculations here, it’s best to send a flowchart showing the horizontal heights and other data; just these few numbers aren’t enough.
Is the area above the liquid surface the saturated gas phase? There is still a pressure factor: in the case of a saturated phase, the liquid level height minus the pipeline losses gives the net positive suction head available for the device. If there is a certain pressure (a pressure higher than the saturated vapor pressure), use this pressure minus the saturated vapor pressure, then divide by the density and the acceleration due to gravity of 9.81, and finally add the liquid level height minus the pipeline losses
There are quite a few basic concepts that need to be known; it’s better to read books. Getting married and having your ears pierced right away isn’t something to take lightly. There’s no need to rush; just study calmly*.
This post was last edited by foam_ZPTK on 2018-8-12 at 15:50. What does this mean? Does that mean I don’t even know the basic knowledge?
New arrival here: 1. The speech on the second floor was really rude, so I’d like to retort: At normal pressure, how dare you try to steal some water at 108°C from me? ； Does the saturated temperature of water decrease as pressure increases? Does your family consider the cavitation head meter in fluid transportation to be relevant? Books can be skipped, but words should not be spoken carelessly. The original poster’s description was just not detailed enough; you just need to explain things patiently. 2. The uncle who sells pumps is right; there’s no problem. 3. I welcome those who know how to judge me. 4. Off-topic: Is Qu Chunguang in business or technology?
Why didn’t I see your comment the day before yesterday? I’ve read the posts several times, but it’s not there. Thank you very much. What I used to understand was that the gas pressure above the liquid level, plus the static pressure, equals the inlet pressure