Calculation of vessel evacuation time

For the calculation you will need:

— Chamber volume (V, m³).
— Pump speed (S, m³/h).
— Initial pressure (P₁, mmHg) and final pressure (P₂, mmHg).
— Pump-down curve factor (F) – depends on P₂.

To avoid manual calculations, we have created a convenient calculator – simply enter the parameters and get the approximate pump-down time.

The factor (F) depends on the final pressure (P₂):

The calculator will be useful for:

— Engineers and technologists – to select vacuum equipment faster.
— Service specialists – to check the efficiency of vacuum systems.
— Beginners – to avoid mistakes in settings.

We use this calculator ourselves – it helps us select pumps and configure pump-down modes for vacuum furnaces.

Additional tools for selecting a vacuum pump

On the page you will find additional necessary information:

— Comparative pump tables – to choose a model for your tasks. Some of them are available in our catalog – you can view specifications and purchase immediately.
— Volumes of standard vacuum furnaces in different units – estimate the pump-down time for your equipment. For selection, you can use our recommendations.

⚠ Important!

— The calculation is valid for dry air at standard humidity. If the chamber contains moisture or impurities, the time may differ.
— If moisture is present in the volume, please refer to additional recommendations.

Need help selecting equipment? Ask us – we will find the optimal solution! → Go to catalog.