Journal of the Korean Society of Safety (한국안전학회지)

The Korean Society of Safety (한국안전학회)
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A Study on the Explosion Relief Venting in the Gas Explosion

실내 가스 폭발시 폭발압력 방출에 관한 연구

  • Oh, Kyu-Hyung (Department of Fire Protection Engineering, Hoseo University)
  • Published : 2005.09.30
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Abstract

This study aims to find the safe vent area to prevent a destruction of building by gas explosion in a building. Explosion vessel which used in this experiment is 1/5 scale down model of simple livingroom and its dimension is 100cm in length 60cm in width and 45cm in height. Liquified petroleum gas(LPG) was injected to the vessel to the concentration of 4.5vol%, and injection rate were varied in 1L/min or 4L/min. Gas mixture was ignited by the 10kV electric spark. For analysis the characteristics of vented explosion pressure according to the vent size and vent shape, its size and shape were varied. From the experiment, it was found that explosion pressure in the vented explosion :in affected by the gas injection rate, vent area and vent shape. And the vent area to volume ratio(S/V) to prevent the building destruction by explosion pressure, it is recommended that the design of vent area happened by the explosion should be above 1/500cm in S/V. And if the vent area has complicate structure in same area, vented explosion pressure will be higher than a single vent, and possibility of building destruction will increase. Therefore to effectively vent the explosion pressure for protect a building and residents from the gas explosion hazards, the same vent area should have a singular and constant shape in the cross-sectional area of the vessel.

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References

  1. 한국가스안전공사, 가스사고 편람, 2003
  2. T. Hirano 외, 'Explosion Pressure of Combustible Gaseous Mixtures with Concentration Gradient', Safety Eng. Vol. 18. No. 1, pp. 28-36, 1979
  3. L.Friedel, S. Korfmann, 'Predictive Accuracy of Simplified Vent Area Sizing Methods for the Case of Thermal Runaway Reactions', J. of Loss Prevention in the Process Industries, Vol. 13, pp. 125 -152, 2000 https://doi.org/10.1016/S0950-4230(99)00066-2
  4. O. Koper, F. Westphal, 'Database-supported Documentation and Verification of Pressure Relief Device Design in Chemical Plant', J. of Loss Prevention in the Process Industries, Vol. 16, pp. 73- 79, 2003 https://doi.org/10.1016/S0950-4230(02)00026-8
  5. Kees van Wingerden, 'Prediction of Blast Overpressure Generated by Vapour Cloud effects in Direct Surroundings of Installations Protected by Dust Explosion Venting', J. Loss Prevention in Process Industries. Vol. 6, No. 4 pp. 241-249, 1993 https://doi.org/10.1016/0950-4230(93)80006-8
  6. Kees Van Wingerden, O R Hansen, R Teigland, 'Prediction of the Strength of Blast Waves in the Surroundings of Vented Offshore Modules', unpublished paper
  7. D.Crowhurst, S.Colwell, D.P.Hoare, M Bensilum, 'The Characteristics of Explosion Pressure Measured Around Complex Structure Near Vented Dust Explosion' preprint for 7th Int. Symp. on Hazards, 1996
  8. NFPA 68, 'Guide for Venting of Deflagrations' 1984
  9. Wolfgang Lenckel, Willi Nastol, Nikolas Zarzalis, 'Influence of Turbulence on Transient Premixed Flame Propagation Inside Closed Vessels', Chem. Eng, Technol. 12, pp. 226-233, 1989 https://doi.org/10.1002/ceat.270120131
  10. Dag Bjerketvedt, Kees Van Wingerden,Jan Roar Bakke, 'Gas explosion handbook', pp. 40-65, Elsevier Science, 1997