PERSEE allows us to model the various dangerous phenomena related to natural gas (liquid or gas) and new gases (H2, biogas, CO2). The user can thus define accident scenarios and model the consequences on an industrial installation in order to ensure the safety of people, the environment and property.

Background and issues

Based on historical knowledge of gas infrastructures and benefiting from the latest knowledge gained by research and development projects, the software is based on simplified physical equations for efficient use and calibrated by numerous large-scale trials. In practical terms, PERSEE offers:
  • A platform for all sectors of the gas industry (storage, transport, production of natural gases and new gas);
  • A unique, fast, accurate and ergonomic platform;
  • A tool at the heart of the development of new gases with the integration of gases such as hydrogen and CH4-H2 mixtures.


  • Licenses, training, user support (hotline);
  • Calculations on demand (generic or specific configurations);
  • User club (annual meeting) allowing experience sharing.

Our added value

  • The physical models of PERSEE+ are based on recognized models (fluid mechanics with conservation of mass, energy and momentum) adapted to the specificities of natural gas and hydrogen;
  • The implementation of physical models has been validated with numerous experimental campaigns
  • The validity ranges of the models are clearly identified;
  • The tool has been cross-checked many times with full commercial and 3D software and industrial accidents (e.g. Ghislenghien);
  • It has also been the subject of various third-party assessments (DNV GL, INERIS & TNO) showing its good predictive capabilities and its suitability for modelling accident scenarios;
  • The tool is easy to handle and use, and provides fast and accurate results.

Users and scope of use

PERSEE+ is intended for those responsible for carrying out safety studies (industrial safety engineers):
  • GN, H2 and LNG applications;
  • Realization of hazard and safety studies.
Modules available:
  • Gas side: - gas flow calculation; - free dispersal or interaction with the soil; - free jet fire or interacting with the ground; - heat dose calculation; - overpressure on ignition; - UVCE (Unconfined Vapour Cloud Explosion) - overpressure at pipe rupture; - pipe heating; - gas migration in the soil; - building dispersion; - equivalent piping method;
  • Liquid side: - flow calculation; - dispersion and LNG jet fire; - spreading, evaporation and dispersion of LNG slick; - pool fire; - BLEVE (Boiling Liquid Expanding Vapour Explosion); - TRP (Phase Rapid Transition)

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