Piping networks (RNET)

Hydraulic calculation of meshed piping networks

Fundamentals

For the calculation of meshed pipe systems the method of HARDY-CROSS is known. Though, problems may occur in case of non-linear elements like fittings, orifices or cross section changes. For the simulation of sprinkler systems it is also necessary to consider the dynamic response of the nozzles, i.e. the amount of water outlet as a function of the local pressure.

Fields of application

The RNET program allows an easy calculation of pipe networks with any fitting as well as calculating and simulating Sprinkler systems. A graphical interface makes it easy to use

• Supply networks for any gas, vapour or liquid
• Suctions, fillings, bottling plants, unsteady tapping e.g. from Sprinkler systems, hydrants, closing characteristics of valves and accessories, pipe runs with any fitting
• Compressible flow calculable even with heat loss

Features Calculation of pressure loss and flow velocity Calculation of static pressure at any point Creating more than one characteristic pump curve including graphical representation of the operating points Unsteady calculation; e.g. pressure course depending on time Integrated properties for water and steam Integrated data for fittings,orifices, valves Extendable by input of user-defined data Pressure-regulating devices Fittings with friction factors Rectangular airducts Calculation of orifices

Further features

Mixture calculation

Density and viscosity for mixture are determined depending on temperature , with gases also depending on pressure.

Maldistribution in whole system or definable area

Creating similar systems automatically

Documentation

• Display of results in graphical or tabular form
• Display can be adjusted individually by many options as fonts, colours, showing different values simultaneously.
• Saving results as graphics file and text file in MS EXCEL format
• Export of results to MS EXCEL
• Descriptions may be edited for each pipe run
• Graphical display of characteristic pump curves and unsteady course
• Creating EXCEL sheets and diagrams for unsteady data

Table of results

Results in EXCEL

The graphics are exported to EXCEL as scalable graphics. You can now work with the calculated project within the MS OFFICE package (word, power point, etc.) which enables you to integrate the results into a quotation, presentation, etc, easily.

Characteristic pupmp curve with operating points of two pumps

• Transfer of isometrical data by an open interface, e.g. Plant Design or Intergraph

• Unsteady calculation.

Standard package / Possibilities of combining modules for special solutions

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