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Help How to use the Stokes – short instruction

How to use the Stokes program

1. Arrange objects in the scheme

When opening the program, only the gas source is present in the scheme. Now you need to place all the other objects on the scheme.

Click the button on the left with the desired type of object (consumer/splitter/reductor/pump). After that, left-click on the places where you want to place objects of this type.

2. Connect nodes by pipes

Select one or more nodes. After that, click the middle button (mouse wheel) on the node to which you want to connect the selected ones.

If there is no wheel in the mouse (for example, it is not a mouse, but a laptop touchpad), right-click on the second node and select "Lay pipe here" from the context menu.

3. Set gas and object parameters

Click the "Parameters" button on the left for set the gas parameters (density, viscosity).

The window of parameters of objects and pipes is called by double-clicking on them.


  • Screenshots were taken in version 20.12, newer versions may vary slightly;
  • The manometric pressure is used everywhere. I.e., the standard atmospheric pressure of 101325 Pa is taken as 0;
  • Gas flow rate refers to the flow rate of gas reduced to atmospheric pressure;
  • Switching the calculation from formulas for low pressure to formulas for medium and high (formulas in clause 3.27 of SP 42-101-2003) occurs automatically when the pressure at the beginning of the pipe is greater than 5 kPa;
  • The type of fluid is determined automatically by : if the density is at n.o. 50 kg/m3 or more, the pumped fluid is considered a liquid.
  • Gases in calculations are considered ideal (compressibility factor = 1), liquids – absolutely incompressible;
  • The diameters in the form of pipe parameters are internally.