Liquefied natural gas (LNG) buses and trucks will require he1 storage vessels. In this report, an aluminum Insulated Pressure Vessel (IPV) capable of storing 135 kg of LNG is designed. The IPV is lighter than current stainless steel vessels, does not require an expensive composite overwrap, and has a seamless inner vessel.

Finite element models are developed and validated by modeling simple pressure vessel shapes with closed form mathematical expressions. These models are then used to perform a structural and thermal analysis of the IPV. Additional thermal analysis calculation methods for the IPV are developed to determine the IPV's heat leak, hold time, and boil off rate. Results indicate the IPV has lower heat leak and boil off rate, and higher hold time than current vessels. Sensitivity analysis is used to determine how the IPV performance and design is affected by changes in operating pressures and IPV dimension