Vacuum pump inlet pressure
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I have a question: is there any specification for the pressure at the inlet of the vacuum pump during vacuum pumping? What is the general specification for the appropriate import pressure? Have you encountered a situation where the vacuum pump operates under overload when there is slightly some pressure at its inlet? Is this normal? Thank you
You provide these parameters yourself; there are no fixed rules – once you have the parameters, you can simply choose the appropriate option
Since a vacuum has been created, why is there still pressure at the inlet? For vacuum operation, it should first be evacuated to the desired vacuum level at normal pressure before feeding materials and starting up the system.
To evacuate and reduce the pressure in a tower, there is definitely some pressure inside the tower at the beginning. I said what the maximum limit for this pressure should be. Do different types of vacuum pumps have different inlet pressure ranges? How high can it go?
It definitely has to be determined based on your system parameters and the design parameters of the vacuum pump. Vacuum pumps definitely have their own limits. Take a look at your system pressure and vacuum level design as well. You can’t just say it out of thin air.
If the equipment to be evacuated is under pressure, it is generally necessary to release that pressure before evacuating, otherwise the vacuum pump is prone to overload.
In a pressure swing adsorption unit, the lowest pressure in the tower can be reduced to 0.05 MPa; after that, vacuum is created. Will this cause the vacuum pump to overload? It’s impossible for it to leak to atmospheric pressure
Generally, rotary vane pumps are started at atmospheric pressure, while Roots pumps are started at low vacuum (20 mbar)