Consequences of underwater releases of LNG



The potential outcome of marine incidents involving liquefied natural gas (LNG) is of significant interest, but most work has examined above-waterline releases onto the sea surface. This paper examines the likely discharge rate and changes in hazard zones for underwater releases of LNG compared to surface releases. The discharge rate calculation for underwater LNG releases is more complex than that for the above-waterline case because of the initial ingress of water into the LNG tank. The entry of water into the LNG storage tank will cause a small positive pressure in the tank and increase the LNG discharge rate through the hole. This report, which identifies some uncertainties, while discussing the sequence of development for such LNG incidents, would support planning for larger-scale experimental projects. © 2005 American Institute of Chemical Engineers Process Saf Prog, 2005