Dependence of Explosion Overpressure of Flammable Gas on the Change of Volume Blockage Ratio of Facilities

설비 혼잡도에 따른 가연성 증기운의 폭발과압의 변화

Lee, Seung Kuk;Lee, Da Eun;Kim, Sung Chan;Yoon, Kee Bong

  • Received : 2015.11.03
  • Accepted : 2015.12.08
  • Published : 2015.12.31


A series of CFD calculation has been conducted to investigate the effect of facility confinement on explosion power for process plant facility. The level of confinement of a facility was simplified with VBR(volume blockage ratio) and averaged size of obstacles. FLACS which is 3D CFD code of gas dispersion and the explosion was used for simulating the explosion phenomena in the idealized domain with different confinement level. The CFD results showed a tendency that the overpressure increases with increasing VBR and number of obstacles. The effect of VBR on the overpressure was relatively small for the case of number of obstacle less than 25. The results of this study can be used to provide a safety guideline considering the facility confinement in case of leakage accident of flammable gas and vapor in process plants.


explosion;VBR(volume blockage ratio);process plant;safety;FLACS;CFD


  1. Van Den Bosch, C. J. H., Weterings, R. A. P. M., Methods for the Calculation of Physical Effects, Report, TNO CPR14E, (1996)
  2. GexCon, "On the use of simulation results obtained with the CFD code FLACS for optimizing safety gaps between repeated congested regions." CMR, (2014)
  3. Van Den Berg, A. C., Mos, A. L., Research to Improve Guidance on Separation Distance for the Multi-nergy Methos(RIGOS), TNO Prins Maurits Laboratory, Nryhrlsnfd, (2005)
  4. Hansen, O. R., Hinze, P., Engel, D. & Davis, S., "Using Computational Fluid Dynamics(CFD) for Blast Wave Predictions", Journal of Loss Prevention in the Process Industries, 23:885-906, (2012)
  5. Dan, S. G., Kim, T. Y., Shin, D. I., "Consequence Analysis of Hydrogen Blended Natural Gas (HCNG) using 3D CFD Simulation", KIGAS, 5, 206-209, (2010)
  6. Dan, S. G., Park, K. J., Kim, T. O., Shin, D. I., "Explosion Simulation for Quantitative Risk Assessment of New Energy Filling Station", KIGAS, 15, 60-67, (2011)
  7. Jang, C. B., Lee, H. J., Lee, M. H., Min, D. C., Go, J. W., Kwon, H. M., "A Dispersion and Explosion Simulati-on of Flammable Gas Using CFD", KIGAS, 16(5), 58-64, (2012)
  8. Kang, S. K., Bang, H. J., Jo, Y. D., "Consequence Analysis of Hydrogen Blended Natural Gas (HCNG) using 3D CFD Simulation", KIGAS, 17(5), 15-21, (2013)
  9. Kim, S. J., Seo, S. K., Paik, J. K., and Czujko, J., "The Effects of Congestion and Confinement on the Gas Explosion Loads", KSCFE, 11, 68-73, (2014)
  10. Kwak, M. C., Yeo, J. I., A Flame Acceleration Modeling for Complicated Mixture of Flammable Gas, KSAM Book B ,36(3), 315-324, (2012)
  11. Jo, S. W., Kwak, S. Y., Lee, S. I., "A study of External Explosion Simulation and Safety Analysis for Explosion Proof Transformer Room", CAD/CAM 674-681, (2012)
  12. Seok, J., Jong, S. M., Park, J. C., Beak, J. G., "CFD Simulation of Methane Combustion for Prediction of Fire and Explosion in the Offsite Plant", KSOCEAN, 27(2), 59-68, (2013)
  13. Bjerketvedt, D., Bakke, J. R. & Van Wingerden, K., Gas Explosion Handbook, Report, Christian Michelsen Research, CMR-93-A25034, Bergen, Norway
  14. Gexcon, FLACS v10.3 User's Manual Technical Reference, Norway, CMR, (2015)


Supported by : 한국에너지기술평가원(KETEP)