FLACS is now approved for LNG Vapor Dispersion Modeling under U.S. Federal Regulations.

On October 7, 2011, The Pipeline and Hazardous Materials Safety Administration (PHMSA) of the U.S. Department of Transportation issued a final approval letter for FLACS to be used in LNG vapor dispersion modeling scenarios according to federal regulations (49 CFR 193.2059).  The approval culminates a multi-year effort which included the validation of FLACS against a total of 33 dense gas dispersion experiments, as specified in the Model Evaluation Protocol.

FLACS is currently the only approved model for the simulation of all LNG vapor dispersion scenarios required for the siting of an onshore LNG facility in the United States.  The scenarios that can be modeled using FLACS include:

  • Dispersion from regularly- or irregularly-shaped LNG pools;
  • Dispersion from LNG spills into impoundments of any shape and aspect ratio;
  • Dispersion from LNG spills into trenches of any shape and aspect ratio;
  • Dispersion from releases in any direction, including flashing, jetting, venting, vent stacks and pressure relief discharges;
  • Dispersion from multiple coincident releases, including multiple release locations that may influence each other;
  • Dispersion over obstructions, large and small.

For any questions regarding FLACS or its application to LNG vapor dispersion modeling, please contact Dr. Filippo Gavelli at +1 (301) 915-9925, or at This email address is being protected from spambots. You need JavaScript enabled to view it..

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