Evaluation of consequence assessment methods for pool fires on water involving large spills from liquefied natural gas carriers |
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Authors: | Hideyuki Oka Susumu Ota |
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Institution: | (1) Navigation and System Engineering Department, National Maritime Research Institute, 6-38-1 Shinkawa, Mitaka, Tokyo 181-0004, Japan |
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Abstract: | This article concerns thermal radiation hazards associated with unconfined liquefied natural gas (LNG) spills on water. Consequence
assessment methods were compared to clarify their model characteristics in large-scale LNG spills from an LNG carrier (LNGC).
The consequences of LNG release, pool spread, and pool fire hazards were estimated using the following practical methods:
the Federal Energy Regulatory Commission’s (FERC) method, the Sandia National Laboratories’ method, and the Fay method. The
sensitivity of consequence analysis results to the breach size of a tank was examined under the assumption that LNG is released
from a common type LNGC of 125000 m3 cargo capacity. Consequently, it was found that the FERC method is useful from the practical viewpoint of being applicable
to any breach size. Finally, thermal radiation hazards from pool fires involving spills from one of the latest and largest
LNGCs (250 000 m3 cargo capacity), which are currently considered for construction, were investigated using the recommended FERC method, and
the results are discussed in comparison with those for common type LNGCs. As a result, it was found that the maximum thermal
hazard distance is longer by only about 24% compared with the common type LNGC, whereas the spill volume is twice as much. |
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Keywords: | Consequence analysis LNG spills on water Hazard assessment Pool fire Thermal radiation |
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