Online help for the Stokes – program for hydraulic calculation of pipelines
If you have any questions about using Stokes, write to i@pipecalc.ru.
Stokes functions and limitations
Stokes is designed for hydraulic calculations of pipeline networks with isothermal single-phase flow of gas or liquid. It is assumed that all pipes are round, the compressibility factor of gases = 1, liquids are incompressible.
Stokes is suitable for hydraulic calculation of distribution gas pipelines, pipes for cold water supply, oil product pipelines.
Stokes is NOT suitable for calculating heating mains, hot water pipes, ventilation, sewerage, systems with storage tanks.
How to use the Stokes – short instruction
A brief example to get started: how to create objects in Stokes, connect nodes with pipes, change the parameters of objects and the pumped fluid.
Create and edit objects on scheme
How to create and delete nodes and pipes in the scheme. Description of parameters of all types of objects and scheme.
Editing lists of pipes and other objects
How to add your variants or remove unnecessary options to drop-down lists in object editing forms.
Alternative pipe reference books for water supply tasks.
Object labels on scheme
For show/hide labels press F7 or menu View → Show object labels.
For configuring open program settings and edit the appropriate templates. In templates, you can specify some parameters in curly brackets, which will be replaced by the value of the corresponding parameter for a specific object.
Printing and data export
Printing and data export
Printing
Export to PDF
Pipes table, export to Excel
Printing
To print the scheme use the menu item File → Print or press Ctrl+P.
Stokes scales the scheme so that it fits on a sheet of the selected size and centers it in the center of the sheet.
If the scheme is stretched in width, when printing, select the landscape layout of the sheet in the printer settings, otherwise portrait.
Before printing, you can turn on/off the background Ctrl+B and the labels of objects F7. The scheme will be printed in the view in which it is displayed on the sc
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Equations for calculating pressure losses and velocity in a pipeline section
Pressure losses in the pipeline section consist of losses due to friction along length of pipe, differences in hydrostatic pressure due to the difference in the altitudes of the beginning and end of the pipe, and losses on local resistances.
Losses along length of low pressure gas pipeline or pipelines with liquids are calculated according to the Darcy-Weisbach equation.
If the beginning and end of the pipe are at different altitudes, the hydrostatic pressure is taken into account.
To account for pressure losses on local resistances, the estimated length of the pipeline is increased by 5-10% by setting the
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Algorithm for calculating the distribution of flows in ring networks and networks with multiple sources
Description of the method for distributing flow across sections of the ring and between different sources. An iterative algorithm is used: in each iteration, a linear approximation of pipe resistances is calculated and an system of linear equations with these approximations is solved. The iterations are repeated until an acceptable pressure mismatch is achieved.
Autoselect of diameters
What does the autoselect of pipe diameters do? Checking the possibility of solving the problem. Determining of network safety margin. Calculation of the diameter at which all pipes of the network are assigned the conditions are met. Minimization of diameters in dead-end sections. The list of diameters used in the iteration.
