Machines. Technologies. Materials.
Vol. 17 (2023), Issue 7, pg(s) 244-254

MACHINES

Design of lng tank Type C

  • 1 University of Zagreb, Faculty of Mechanical Engineering and Naval Architecture, Zagreb, Croatia

Abstract

Cylindrical tank-type c is designed for cruise passenger ships trying to adopt hull space and meet the requirements of propulsion. Tank must be a double wall with the vacuum space in between, which is also fulfilled with the perlite as insulation. The main input for the design was a tank capacity of 430 m3, vapor pressure, and available space inside of hull structure. The holding period of the boil-off gas is limited to 21 days of ship voyage. Trying to satisfy the volume capacity of the inner tank different dished end of tank was observed. The inner tank is divided into segments for the calculation of hydrodynamic pressure. According to classification rules, dnv and igc rules tank thickness, supports, stiffening and vacuum rings are determined to satisfy bending and buckling requirements. Some of the requirements were according to british standards for validation of the results. The material that is used for calculation is stainless steel 304 l. The main goal of this paper is to provide the optimal design of the lng tank type c considering the mass of the whole lng tank, with attendance to reduce the steel mass of the structure by optimizing shell thicknesses and the number of vacuum rings. After analytical calculations are made finite element analysis is used for verification of the given results. According to the given results space for improvements of tank-type c was observed.

Keywords

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