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A study on forces generated on spherical type LNG tank with central cylindrical part under various static loading

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주제분류조선공학

초록

The number of fabrication shop for spherical type LNG tank is proportional to that of the tank radius to be constructed. Due to limitation of facility investment including building sites, it is practically difficult to fabricate various size tanks with perfectly spherical shape in the yards. The efficient method to be capable of increasing cargo tank volume is to extend vertically the conventional spherical type LNG tank by inserting a cylindrical shell structure. The main purpose of this study is to derive related equations on forces generated on spherical type LNG tank with central cylindrical part under various static loadings in order to establish the simplified analysis method for the initial estimate. In this study, equations on circumferential and meridional force have been derived and verified by relations with the reaction forces per unit length of equator.

Abstract

The number of fabrication shop for spherical type LNG tank is proportional to that of the tank radius to be constructed. Due to limitation of facility investment including building sites, it is practically difficult to fabricate various size tanks with perfectly spherical shape in the yards. The efficient method to be capable of increasing cargo tank volume is to extend vertically the conventional spherical type LNG tank by inserting a cylindrical shell structure. The main purpose of this study is to derive related equations on forces generated on spherical type LNG tank with central cylindrical part under various static loadings in order to establish the simplified analysis method for the initial estimate. In this study, equations on circumferential and meridional force have been derived and verified by relations with the reaction forces per unit length of equator.

참고문헌 (9)

  1. Kim, J. W., "A LNG pressure vessel design", J. Korean Weld. Soc, 18(4), pp.28~37 (2000)
  2. Kim, Y. M., "A study on the thermal design of the cryogenic LNG carrier", J. Korean Soc. Mar. Eng, 17(4), pp.1~10 (1993)
  3. Lee, S. D., "A study on the thermal characteristics of MOSS type LNG carrier", J. Korean Soc. Mar. Eng, 22(1), pp.28~34 (1998)
  4. Nam, Y. Y., "Structural safety assessment of independent spherical LNG tank (3rd report) e safety assessment of tank system against cryogenic temperature", J. Soc. Nav. Archit. Korea, 30(4), pp.83~92 (1993)
  5. Nho, I. S., "Structural safety assessment of independent spherical LNG tank (1st report) e fatigue strength analysis based on the S-N approach", J. Soc. Nav. Archit. Korea, 30(2), pp.132~140 (1993)
  6. Nho, I. S., "Structural safety assessment of independent spherical LNG tank (2nd report) e fatigue crack propagation analysis based on the LBF theory", J. Soc. Nav. Archit. Korea, 30(4), pp.74~82 (1993)
  7. Sloshing Load Analysis in Spherical Tank of LNG Carrier, "Noh, B. J.", Special Issue of the Society of Naval Architects of Korea, 22~30 (2005)
  8. 신상훈, "구형 LNG 운반선의 초기 탱크 설계를 위한 간이해석법 연구", 대한조선학회 논문집, 52(2), pp.125~134 (2015), 대한조선학회
  9. Timoshenko, S., "Theory of Plates and Shells" (1959), McGraw-Hill

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