NEPLAN | Gas basic module / Contingency analysis

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This basic module enables the user to model, design and optimize his Gas network using NEPLAN’s user friendly graphical interface and NEPLAN’s powerful, up-to-date calculation algorithms to address a wide range of applications.

General Characteristics

  • Powerful, up-to-date calculation algorithms (extended Newton-Raphson)
  • Computes pressures, flow rates and other operational quantities with excellent computational speed and accuracy
  • Simulation of any kind and size of networks
  • Sophisticated valve and regulator models
  • Simultaneous calculation of different pressure zones (high, medium, low) and partial networks
  • Compressible and incompressible gas calculation
  • Calculation with user-defined operational states
  • Calculation with synthetic profiles and/or field measurements
  • Control of minimum system pressure
  • Extensive scenario and operational state management
  • Global, regional or simultaneity factors for demand changes
  • Ideal for planning and comparative analysis
  • Computes the minimum/maximum flow times of the fluid to reach any node in the network starting from a user-defined reference point.
  • Evaluation of the mixture of the fluid of every consumer (feeder contribution)
  • Temperature dependent loads are considered
  • Handles pure hydrogen networks or networks of any combination of natural gas and hydrogen or other gas, e.g. biogas
  • Tracking of calorific value



Upon calculations, results are automatically displayed on the single line diagram while their content and graphical information can be customized. Result evaluation and processing is easier due to visualization functions:

  • Coloring according to variable ranges (e.g. velocity, flow, pressure-losses, pressure etc.)
  • Highlighting of overloaded elements (e.g. velocity v > v max)
  • Line width proportionaly to many variables, including the flow and diameter
  • Result output to an excel like table sheet, with copy/paste possibilities to MS-Excel
  • Display results in a sophisticated chart manager (e.g. bar or line chart)
  • Comparing results was never easier: Results from other variants can be displayed in the same result label and in the same chart



Contingency Analysis 

Contingency analysis or N-1 analysis is used to determine the security of a network as well as the importance of the components. The outage list can include any element, and also common mode definitions are possible (simultaneous equipment failure). The basis of the Contingency Analysis is a fast gas pipe line calculation. All defined outages are calculated and their impact is reported in terms of violations caused. The results can be viewed in tables and charts and the offered tools are aiding the engineers for the ranking of severity of each outage.


Remedial Actions (Event Definition)

The Remedial Action Schemes (RAS) is a separate module and could be licensed with the modules Gas Calculation and Contingency Analysis.

The user can define custom events for a series of gas pipe line calculations. With the defined events, the status of the simulated network can be controlled, e.g. dispatch gas supply in case of limit violation so that the violation disappears. This module contains, beyond the standard control capability of the gas pipe line calculation, powerful functions to observe and control the gas network.