Original scientific paper
https://doi.org/10.17818/NM/2025/2.5
Structural Assessment of Frame Design of 40-ft ISO LNG Tank under High and Low Cycle Load Conditions
Tuswan Tuswan
; Universitas Diponegoro Faculty of Engineering Department of Naval Architecture Semarang, Indonesia
Denis Paskal
; PT. Marcopolo Shipyard Batam, Indonesia
Ocid Mursid
; University of Strathclyde Department of Naval Architecture, Ocean and Marine Engineering Glasgow, United Kingdom
Alfiy Alfatarizqi
orcid.org/0009-0008-3431-9219
; Institut Teknologi Sepuluh Nopember Department of Marine Engineering Surabaya, Indonesia
Hartono Yudo
orcid.org/0000-0002-6491-3365
; Universitas Diponegoro Faculty of Engineering Department of Naval Architecture Semarang, Indonesia
*
* Corresponding author.
Abstract
As a leading global exporter of liquefied natural gas, Indonesia faces substantial logistical challenges in distributing LNG, primarily due to its archipelagic nature. As the primary distribution component, the strength and durability of the LNG ISO tank design for the Mini LNG Carrier is paramount because it must withstand the multifaceted and rigorous demands of multimodal operations spanning land and sea environments. This study examines the fatigue performance of 40-ft ISO LNG tank frame configurations under stationary and dynamic operational loads to obtain optimum strength-to-weight savings. Finite element analysis investigates the fatigue life of 4 proposed LNG tank frame designs under high-cycle and low-cycle conditions, adhering to the ASME and ISO 1496-3 standards guidelines. It can be found that the elimination of longitudinal, vertical, and horizontal frames can effectively reduce stress and displacement and reach 6% total weight saving. The study conclusively shows that in both low and high cycle loading, the fatigue damage factor (FDF) values are below the critical threshold, indicating all proposed frame designs likely achieve a 20-year service life.
Keywords
ISO LNG tank; frame design; fatigue analysis; finite element analysis; low cycle
Hrčak ID:
335532
URI
Publication date:
26.6.2025.
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