Vacuum Pumps  Exhaust Pipe Capacities
Capacities of vacuum pump exhaust pipes.
The diagrams below can be used to indicate vacuum pump exhaust pipe line capacity:
Air flow  scfm
Air flow  nl/s
Example  Vacuum Pump Exhaust Pipe
The exhaust air flow from a vacuum pump is 1200 cfm and the required length of the exhaust piping is 60 ft.
As we can see the range of the diagram above is limited but with half the flow  600 cfm  the maximum length of a 6" pipe is approximately 120 ft. Or in other words  with two 6" pipes in parallel there will be enough capacity.
Alternatively  if we compare an 8" pipe with a 6" pipe  we see that the internal area of the 8" pipe is twice the area of the 6" pipe  and we can assume that a single 8" pipe provides enough capacity.
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