Advanced Gas Dispersion and Explosion Analysis for gas fuelled ships

Advanced Gas Dispersion and Explosion analysis is required in consequence analysis following HAZIDs for ship design or retrofit projects using gas as fuel.

Those analyses are performed within the framework of IMO/MSC.285(86), IMO IGF and IGC code as well as Bureau Veritas Rule Note NR 529 and Guidance Note NI 547.

The advanced gas dispersion analysis implies the use of a CFD model (FLACS dispersion) which is pertinent for:

  • strong wind effect,
  • re-circulation,
  • large obstacles,
  • detection optimisation,
  • confined space,
  • LNG spill,
  • gas leak, etc.

The advanced gas explosion analysis implies the use of CFD model (FLACS dispersion), which is pertinent for the analysis of

  • obstacles,
  • accurate evaluation of flame accelerations,
  • calculation of overpressure loads on structural elements,
  • dimensioning of burst disks, etc.

Usual outdoor scenarios are emergency venting scenarios, bunkering release scenarios, etc. while the usual indoor ones are accidental leakage scenarios, ventilation / detection performance scenarios.

Typical gas is LNG. however hydrogen is currently investigated.

Tecnitas performs those studies under the IMO IGF and IGC Codes concerning complex 3D areas with problems of congestion, confinement and low-flashpoint gases (LNG, LPG, Hydrogen), for example.