Design of Independent Type‐B LNG Fuel Tank: Comparative Study between Finite Element Analysis and International Guidance

Kim, Tae-Wook; Kim, Seul-Kee; Park, Seong-Bo; Kim, Myung-Sung

doi:10.1155/2018/5734172

Cited by 11 publications

(10 citation statements)

References 13 publications

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“…Therefore, such tanks are advantageous in terms of inspection and repair capacities. In contrast, type C independent tanks are designed as pressure tanks with a high inner pressure and without the equipment for BOG processing (Table 1) [14]. Such tanks are mainly used as fuel tanks for LNG-propelled ships due to their low space efficiency.…”

Section: Introductionmentioning

confidence: 99%

“…Table 1. IMO independent type tanks for LNG ship [14]. ization of liquefied gas as the external heat is ingressed.…”

Section: Introductionmentioning

confidence: 99%

“…Table 1. IMO independent type tanks for LNG ship [14]. In the context of the expansion of the ECAs and more stringent environmental regulations, it is necessary to examine small vessels sailing along the coast as well as large vessels.…”

Section: Introductionmentioning

confidence: 99%

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Practical Prediction of the Boil-Off Rate of Independent-Type Storage Tanks

Lee

Cha²,

Kim

et al. 2021

JMSE

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Because environmentally-friendly fuels such as natural gas and hydrogen are primarily stored in the form of cryogenic liquids to enable efficient transportation, the demand for cryogenic fuel (LNG, LH) ships has been increasing as the primary carriers of environmentally-friendly fuels. In such ships, insulation systems must be used to prevent heat inflow to the tank to suppress the generation of boil-off gas (BOG). The presence of BOG can lead to an increased internal pressure, and thus, its control and prediction are key aspects in the design of fuel tanks. In this regard, although the thermal analysis of the phase change through a finite element analysis requires less computational time than that implemented through computational fluid dynamics, the former is relatively more error-prone. Therefore, in this study, a cryogenic fuel tank to be incorporated in ships was established, and the boil-off rate (BOR), measured considering liquid nitrogen, was compared with that obtained using the finite element method. Insulation material with a cubic structure was applied to the cylindrical tank to increase the insulation performance and space efficiency. To predict the BOR through finite element analysis, the effective thermal conductivity was calculated through an empirical correlation and applied to the designed fuel tank. The calculation was predicted to within 1% of the minimum error, and the internal fluid behavior was evaluated by analyzing the vertical temperature profile according to the filling ratio.

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Section: Introductionmentioning

confidence: 99%

“…Table 1. IMO independent type tanks for LNG ship [14]. ization of liquefied gas as the external heat is ingressed.…”

Section: Introductionmentioning

confidence: 99%

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Practical Prediction of the Boil-Off Rate of Independent-Type Storage Tanks

Lee

Cha²,

Kim

et al. 2021

JMSE

Self Cite

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“…Recent studies pertaining to membrane-type or independent type-B tanks are relatively abundant [7][8][9][10][11][12][13]. Kim et al proposed a procedure for structural integrity evaluation of a type-B LNG fuel tank based on the International Code of the Construction and Equipment of Ships Carrying Liquefied Gases in Bulk (IGC code).…”

Section: Introductionmentioning

confidence: 99%

Structural Integrity Assessment of Independent Type-C Cylindrical Tanks Using Finite Element Analysis: Comparative Study Using Stainless Steel and Aluminum Alloy

Park

Cho

Kim

2021

Metals

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The International Maritime Organization stipulates that greenhouse gas emissions from ships should be reduced by at least 50% relative to the amount observed in 2008. Consequently, the demand for liquefied natural gas (LNG)-fueled ships has increased significantly. Therefore, an independent type-C cylindrical tank, which is typically applied as an LNG fuel tank, should be investigated. In this study, structural integrity assessments using finite element analysis are performed on C-type LNG fuel tanks for a sea-cleaning vessel. In addition, the applicability of stainless steel and aluminum alloys is evaluated for LNG tank construction. Structural analyses and fatigue limit evaluations, including heat transfer analyses for the tank based on IGC code requirements, are performed, and the results are compared. The results of this study are expected to facilitate the selection of materials used for independent type-C tanks.

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“…Recently, studies on sloshing have increased for the application of LNG fuel tanks [2][3][4]. The most popular methods of sloshing studies are model tests and numerical simulations.…”

Section: Introductionmentioning

confidence: 99%

Numerical Study on the Tank Heel Determination Using Smoothed Particle Hydrodynamics

Park

Luong

Choung

2021

JMSE

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Tank heel minimization is a significant issue in the design of LNG fuel tanks because it is associated with stable suction pump operation and thermal shock requirements during LNG bunkering. This study examined how the LNG tank heel is minimized, maintaining a suction pump fully submerged in LNG during dynamic vessel motion. The study assumed two LNG fuel tanks mounted on the forward deck of a 50,000 deadweight class oil product carrier. Information on the dimensions and shape of the LNG fuel tank was determined from Wartsila’s brochure, and the specifications of Vanzetti’s suction pump were referred to. The LNG fuel tank and LNG heel were modeled as rigid elements and hydrodynamically smoothed-particles, respectively. The number of particles could be determined by performing even keel analyzes by adding or subtracting particles until the target head was satisfied under the gravity load. To simulate the motion of the LNG fuel tank, the pitch and roll periods and amplitudes of the ship were calculated using the DNV classification rules. Visual observations of the dynamic flow during the pitch and roll motions with respect to the ship’s center of mass showed that the roll motion was more critical from the viewpoint of the LNG heel than the pitch motion. After performing the simulations for three cycles of roll and pitch motions, the suction pump submergence was reviewed in the last cycle. Under the conditions assumed in this study, a filling ratio of 15% was determined as the minimum LNG tank heel. Although the LNG heel has customarily been determined, the LNG heel needs to be determined through hydrodynamic analyses of each vessel because it depends on the shape of the fuel tank and the vessel motion characteristics.

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Design of Independent Type‐B LNG Fuel Tank: Comparative Study between Finite Element Analysis and International Guidance

Cited by 11 publications

References 13 publications

Practical Prediction of the Boil-Off Rate of Independent-Type Storage Tanks

Practical Prediction of the Boil-Off Rate of Independent-Type Storage Tanks

Structural Integrity Assessment of Independent Type-C Cylindrical Tanks Using Finite Element Analysis: Comparative Study Using Stainless Steel and Aluminum Alloy

Numerical Study on the Tank Heel Determination Using Smoothed Particle Hydrodynamics

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