LNG Storage: Safety Analysis, Annual Report for January-December 1982

摘要

Progress is summarized for two projects in the area of LNG safety: (1) Rollover Phenomena: A non-linear evolutionary model has been used to study heat and mass transfer processes between two homogeneous layers with an initial step change in temperature and concentration across the interface. Two types of behavior were discovered: At low stability ratios, a steady state characterized by an antisymmetric velocity profile was reached whereas at higher stability ratios the velocity profile oscillated. In the former case, the buoyancy flux was proportional to the stability ratio while in the latter it was independent of it; (2) LNG Tank Dynamics. New experimental results were obtained to delineate the effect of liquid height (L/D) upon tank dynamics. From these it was possible to isolate the effects of side- and bottom-wall heat leaks, the latter having an appreciable influence. The excess-boiloff data were in substantial accord with an earlier, single time constant, theoretical model.