Condition assessment of primary barriers in LNG cargo containment systems under multifaceted loadings: tension, compression, shear and pressure

This study investigates the structural integrity of the GTT Mark III membrane-type Liquefied Natural Gas Cargo Containment System (LNG CCS), focusing on the 1.2 mm SUS304L stainless steel primary barrier. Using an advanced material model for finite element analysis, the research evaluates the barrier’s response to critical loads, including tension, compression, shear, and internal pressures, encountered during maritime transport. Fracture criteria under tension and buckling behavior under compression are established, along with shear effects and their interactions. Special attention is given to deformation in the corrugated sections of the primary barrier, which are prone to displacement. By addressing static and dynamic pressures, the study provides key insights into failure mechanisms. In light of rising LNG demand and stricter International Maritime Organization (IMO) regulations, this research highlights the need for enhanced safety, reliability, and efficiency in LNG transport. The findings aim to inform improved design and operational guidelines for LNG containment systems.