NEWS

We are pleased to inform you that the 93^rd edition of the FABIG Newsletter is now available on the FABIG website.

FABIG Members are able to download Issue 093 from the Technical Newsletters section of the website (once logged-in) whilst non-Members of FABIG are able to purchase it.

This issue comprises the following:

• Editorial: Send us your “Member news” for publication in forthcoming Newsletters
  G. Vannier - The Steel Construction Institute (SCI)
• News:
  
  • New Technical Note 15 ‘Interim Guidance for Hydrogen Fire & Explosion Safety’
  • Congratulations to the Winner and Runner-up of the Vincent Tam Fire & Explosion Safety Award 2026
  • Registration now open for International Process Safety Day (IPSD) 2026
• Buoyancy effects on combustion products from high-pressure hydrogen jet flames
  T. Wijesekere, M. Runefors, K. Wilkens Flecknoe-Brown - Lund University
  For ignited releases of flammable gases, radiation is often the critical factor for the calculation of safety distances. However, ignited high-momentum releases from high-pressure hydrogen systems result in hot combustion products that travel in the direction of the jet flame. For such releases, gas temperatures in the post-flame zone can lead to larger safety distances than those based on radiation from the jet flame. This paper presents a study investigating the behaviour of hot combustion products from ignited high-pressure horizontal hydrogen jet releases in the post-flame zone. A series of experiments with a maximum release pressure of 300 bar(g) and two different nozzle diameters was conducted, and a model based on the Froude number at the release is proposed for the calculation of the distance at which the jet transitions from the momentum-driven to the buoyancy-driven regime.
• Investigation of liquid hydrogen tank no-vent filling operations
  L.M. Claussner¹, G.E. Scarponi², A. Manzi² and F. Ustolin¹ - ¹Norwegian University of Science and Technology (NTNU) and ²University of Bologna
  Liquid hydrogen (LH2) transfer operations are critical for enabling large-scale hydrogen distribution. However, they pose significant challenges due to extreme cryogenic conditions, boil-off losses, and safety constraints. Given the limited real-world operational experience and experimental data, accurate modelling of cryogenic fluid transfer is critical for predicting outcomes for scenarios where experimental data are not yet available. The work described in this paper evaluated the applicability of the industry-standard process simulation tool Aspen HYSYS for dynamic modelling of LH2 tank filling under no-vent conditions. The Aspen HYSYS model was first validated against experimental data from NASA’s cryogenic transfer tests, and blind simulations were then carried out to evaluate the model’s ability to predict conditions beyond the calibration and validation dataset and to support upcoming trials within the ELVHYS Joint Industry Project.
• Heat exposure from electric vehicle fires: Experimental results and analysis
  P. Dehghani, M. DiDomizio, N. Sauer and A. Barowy - Fire Safety Research Institute
  This paper analyses two Battery Electric Vehicle (BEV) free-burn experiments involving a 2023 Tesla Model 3 and a 2022 Chevrolet Bolt. Battery jetting occurred during these experiments, which were selected from a larger programme of BEV and internal-combustion-engine-vehicle (ICEV) tests. The experiments employed high-resolution, two-dimensional heat flux field measurements as such detailed data are critical for advancing the understanding of BEV fire dynamics, especially regarding their potential to ignite nearby combustibles. The work presented also examined the accuracy of a point source model (PSM) as an engineering tool for modelling heat exposure from a BEV fire.

Take care,

The FABIG Team