cap S sub e f f end-sub equals the fraction with numerator cap V and denominator t end-fraction cross l n open paren the fraction with numerator p sub 0 and denominator p sub 1 end-fraction close paren : Total system volume (chamber + piping) in or liters. : Required pump-down time. : Initial pressure (typically atmospheric pressure, : Desired final absolute pressure. Mechvactech
Lucas raised an eyebrow. "So, $50 \times 0.2$?" vacuum pump capacity calculation xls
"Temperature?"
"Good," Elias nodded. "Now, for a vessel this size, operating at low vacuum, we can estimate the leakage based on the internal volume. In cell B6, type 'Leakage Factor'. Since our joints are old and rusty, use a conservative factor. Let's say 0.2 kg/hr per m3." cap S sub e f f end-sub equals