Structure

TransAT-LNG is an analytical model (further improvement of the original approach of Heestand et al. 2004, A predictive model for rollover in stratified LNG tanks, AIChE J., 29-2.) designed for use in risk assessment and safety analysis in conjunction with the rollover phenomenain LNG storage tanks (safety analysis). The model predicts incipient rollover because the long times and multiscale nature of the problem make it expensive to perform 3D CFD. The issues of interest in the incipient rollover phenomena that can be treated by TransAT LNG are:

• Start time of Rollover phenomenon
• End time of Rollover phenomenon
• Calculate flow from heat ingress in tank
• Production of BOG

If two liquefied natural gas from different sources are brought together in a storage tank, the lighter LNG (red curve ) may lie over the heavier LNG ( blue curve) and could eventually lead to rollover.

Physics and Workflow

TransAT-LNG requires the following input data:

• Mole fractions
• Temperature
• Layer height
• Heat fluxes through tank walls

TransAT-LNG produces the following outputs:

• Rollover time
• Boil off rate