vacuum pump sizing 1

[chemeng1357]

Hi
I have problem in vacuum calculation for our
tank of 4m3 volume and 4barg design pressure,
design vaccum:-700mmHg
please help me!

 

[Montemayor]

chemeng1357:

No one can help you if you don't clearly explain in detail what ails you. We can't read minds or between the lines.

 

[chemeng1357]

vacuum is needed for charging liquid from other tanks
to other tank,what shouldi calculateor measure?

 

[quark]

The capacity of a vacuum pump can be decided by Gaede's equation S = (V/t)ln(P2/P1) where V is volume to be evacuated, t is time, P2 is final pressure and P1 is initial pressure, both in absolute terms. Apply suitable leak rate and you are done.

 

[quark]

A small correction. The ratio should be P1/P2