Design of Prismatic Pressure Vessel with Stiffeners Considering Sloshing Load
In 2012, the International Maritime Organization (IMO) maintained the emissions of Sulphur oxides and Nitric
oxide by setting the emission control area and regulations on ship operations. Recently, with the increasing price of the crude
oil and consideration of environmental pollution, LNG has gained more importance as a relative economical and
environmentally friendly energy. Liquefied Natural Gas is used in propulsion system of ships. Therefore, it is necessary to
design the LNG storage tank, which is one of the significant components of LNG fuel supply systems. This paper presents
design of prismatic pressure vessel with stiffeners for LNG storage for application in ships. 9% Nickel steel is used for the
construction of pressure vessel which having high strength and toughness at relatively low cost. Prismatic pressure vessel
consists of stiffeners, beams and flat plated shells. Nowadays with the increasing size of LNG tanks, sloshing load is an
important design parameter. For LNG storage tanks on ships, rolling and pitching motion of ship cause the largest sloshing
load. Computational fluid dynamics is used for modelling and simulation of the sloshing motion. For static structural
analysis of prismatic pressure vessel, Finite element analysis is used. The computational analysis result shows that the
prismatic pressure vessel satisfies the design acceptance criteria.
Keywords - LNG, Prismatic Pressure Vessel, Stiffeners, Sloshing Load, Finite Element Analysis.