Elias pointed to the top of the tall deaerator vessel. "The first thing the vacuum pump has to fight is the air leaking in. No vessel is perfect. Every flange, every gasket, every seal is a potential enemy."
| Calculation | Formula | Example value | |-------------|---------|----------------| | ln(P_start/P_target) | =LN(B4/B3) | LN(1013/10) = 4.618 | | Q_total (mbar·L/s) | =B7+B8 | 0.5+1.2 = 1.7 | vacuum pump capacity calculation xls
: Offers a guide that can be downloaded as an XLS, focusing on air load and leakage rates. 📄 Informative Papers & Technical Guides Elias pointed to the top of the tall deaerator vessel
t=VSln(P1P2)t equals the fraction with numerator cap V and denominator cap S end-fraction l n open paren the fraction with numerator cap P sub 1 and denominator cap P sub 2 end-fraction close paren : Total system volume (chamber + piping). : Pumping speed (e.g., : Time required for evacuation. Every flange, every gasket, every seal is a potential enemy
If your system has constant leaks or outgassing, the effective pumping speed ( Seffcap S sub e f f end-sub ) must exceed the total gas throughput ( ) divided by your operating pressure (
Sections to estimate leak rates based on joint lengths ( per meter of gasket). Safety Factor: Multiply the final calculated margin) to account for pump aging and vapor spikes. Unit Converter: Automate conversions between mbarm b a r Torrcap T o r r Summary of Results The primary result for a standard system evacuation:
Most engineering forums (Eng-Tips, Reddit r/AskEngineers) share open-source versions. Alternatively, build yours from the logic above in 30 minutes – and gain mastery of vacuum system design in the process.