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Ametric Investigation On the Simplified Triangular Impulse of Sloshing Pressure And Categorization of the Structural Response On the Mark III LNG CCS
Nho, In Sik (Chungnam National University) | Kim, Sung Chan (Inha Technical College) | Jang, Beom Seon (Seoul National University) | Lee, Jang Hyun (Inha Technical College)
It has been well known the sloshing pressure has complex shape and various patterns. The pattern of sloshing pressure is variously characterized by the pressure amplitude, duration time and skewness. The structural response induced by the sloshing pressure is also affected by the pattern of sloshing pressure and the type of structural members. In order to understand the structural response by the perspective view of categorized pattern, it is more efficient to make simple sloshing pressure pattern than to reflect the complex pressure history. In this study, the sloshing pressures obtained by the small scale model test are simplified with respect to their duration and skewness. Dynamic analyses of Mark-III LNG CCS are then parametrically performed with the consideration of various types of sloshing impact. Meanwhile, the failure pressures given the duration and skewness are investigated after parametric calculations are conducted to investigate the effect of pressure parameters on the structural response. INTRODUCTION Liquefied natural gas (LNG) is effectively transported by insulated cargo containment outfitted with membrane tanks. To keep the LNG at cryogenic temperature of -163°C, a containment system is applied to the membrane tanks. In order to provide tightness against the LNG and gas, the insulation is assembled by a thin metal membrane, plywood and foam or perlite. The containment system needs also to withstand the various loads. A critical load on the LNG tank structure is caused by sloshing introduced by a violent motion of LNG at low filling state (Graczyk and Moan, 2011). As sloshing induced pressures may be extremely high, the structural strength of the containment system needs to be assessed during the design stage. There were many attempts made to develop a strength assessment procedure with the consideration of structural response to varying spatial and temporal characteristics of sloshing impact.
- Asia > South Korea (0.46)
- North America > United States (0.28)
Simplified Impinging Jet Model For Practical Sloshing Assessment of LNG Cargo Containment
Hwang, Se Yun (Department of Naval Architecture and Ocean Engineering, Inha University Graduate School) | Lee, Jang Hyun (Department of Naval Architecture and Ocean Engineering, Inha University) | Kim, Sung Chan (Department of Naval Architecture and Ocean Engineering, Inha Technical College)
ABSTRACT: Sloshing impact has been identified as a significant factor in the safety of LNG (liquefied natural gas) cargo transportation. In terms of practical design procedures for LNG cargo containment, it is difficult to evaluate sloshing impact and structural response in realistic way because of the complexity of sloshing phenomena, which is a type of fluid-structure interaction. A simplified numerical model is conducted to create an assessment procedure for sloshing impact in partially-filled LNG cargo tanks. A computational procedure based on an impinging jet of LNG acting on an insulation panel is employed in order to evaluate the sloshing impact on a real cargo tank. The velocity of the impinging jet is determined by a similarity rule that scales up the impact velocity from a small scale to that of actual scale. Several procedural components are introduced for a structural response calculation based on transient pressure. The transient pressure is associated with the model test, computational model of sloshing motion and the impact velocity of both model and real scale. The results of proposed procedure are evaluated by comparison with ship yard practice for membrane containment that. INTRODUCTION In the design of LNG (liquefied natural gas) CCS (cargo containment systems), it is very difficult to accurately determine the effects of sloshing impact and the corresponding response of the cargo containment structure. Based on many studies of the sloshing pressure and corresponding structural behavior, the peak sloshing impact pressure is one of the most important parameters to be assessed during the design of new LNG cargo containment systems (Kim et al., 2010). Over the past four decades, although the technical and practical approaches to evaluate structural behavior have improved, it is very difficult to accurately determine sloshing impact and the corresponding response of the cargo containment structure.
- Asia > South Korea (0.47)
- North America > United States (0.28)