Design and Analysis of Lique ed Natural Gas Mobile Fueling System

Abstract

Liquefied Natural Gas (LNG) as a transportation fuel is advantageous as it is widely available, less greenhouse emissions and economic. Storing LNG is very advantageous as 1 unit of LNG equals to 600 unit of natural gas. LNG mobile fueling system (MFS) is cryogenic transport tank with saturation vaporizer used to store and transport liquid LNG with benefit of mobile fueling. LNG MFS also has advantage of providing LNG to remote location and where pipeline access is not easily available. Cryogenic transport tank is a doubled walled container having inner vessel and outer jacket supported with each other with help of locking system to carry dynamic loads. The inner vessel space between inner vessel and outer jacket is evacuated to provide insulation. Supper Insulation of aluminium foil is wrapped around inner vessel in annular space to control heat inleak into inner vessel. The inner vessel contains LNG at -162 ° C and pressure of 1.33 MPa. The outer vessel is designed for ambient temperature and pressure. All the components have to be designed precisely keeping criticality in mind. Many international codes are used for design of inner and outer vessel. Other important part of system is saturation vaporizer which provides LNG at desired temperature and pressure. The project covers inner vessel design as per ASME Section VIII “Rules for Construction of Pressure Vessels Division I” and outer vessel design is based on CGA 341 which is also used for outer vessel sizing which is very important aspect for transport tank. Saturation Vaporizer is designed to provide LNG at required temperature. Analysis for transport condition is carried out based on CGA 341 with different accelerating conditions. Wing & wing pad analysis with different dimensional parameter has been carried out.