Hi there,
I'm currently designing a vac reservoir for 5 vacuum centrifuges but unsure of how many litres it should be.
The machines currently each have their own vac pump but according to the specs of the centrifuges, 2 of these vac pumps is enough for all of them, saving power, maint. etc.

The pumps are 80L/min, with ultimate vacuum of 0.001mbar and I'd like to just use 2. I have a length of 150mm PVCU storm water pipe with end caps, it's 1700mm long, making the chamber 30L. I'm worried that this is too large. Is it a problem to go this large? Or will it just take longer to reach vac? The only info I can find on vac reservoirs is for car braking systems.

Help please!