Abstract: A CNG or LNG storage containment tank is formed from four substantially vertical hollow tubular walls with first and a second ends positioned approximately 90 degrees apart. Eight horizontal hollow tubular walls interconnect and are in in fluid communication with the respective vertical tubular wall ends to form a six-sided cube-shaped tank configuration defining an interior fluid chamber. A tank support connected to the outer surfaces of the tubular walls and configured to reinforce the tank against loading arising from dynamic movement of fluid within the fluid chamber. In one example, bulkheads are positioned inside the horizontal tubular walls to reduce the sloshing of fluid through the tubular walls and thus the resulting sloshing loads. In another example, a plurality of gusset plates are positioned in a space between the tubular walls at an interior of the tank and connected between the tubular walls to further reinforce the tank.

Abstract: A storage tank containment system including a cubic-shaped tank having an outer shell having cylindrical walls for the efficient storage and transportation of large quantities of fluid, for example, liquid and compressed natural gas.