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Variables
Volume of system, ft
3
(m
3
) V =
Flow capacity of pump, scfm (sL/s) Q =
For vacuum up to 10 inches of mercury (33.9 kPa),
N = 1
For vacuum up to 22.5 inches of mercury (76.2 kPa),
N = 2
For vacuum up to 26 inches of mercury (88.0 kPa),
N = 3
For vacuum up to 28 inches of mercury (94.8 kPa),
N = 4
Natural log constant N =
Calculated Results
Time for Pump to Reach Rated Vacuum minutes, T =
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