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Scientific Journal of Maritime Research, Vol. 39 No. 2, 2025.

Original scientific paper

https://doi.org/10.31217/p.39.2.9

Effect of Excessive Towing Load on The Motion and Tension Behaviour of 50,000 DWT Single Point Mooring System

Tuswan Tuswan orcid id orcid.org/0000-0002-0314-2616 ; Department of Naval Architecture, Diponegoro University, Semarang, Indonesia *
Adam Adam ; Department of Naval Architecture, Diponegoro University, Semarang, Indonesia
Alfiy Alfatarizqi orcid id orcid.org/0009-0008-3431-9219 ; Department of Marine Engineering, Institut Teknologi Sepuluh Nopember, Surabaya, Indonesia
Ahmad Fauzan Zakki orcid id orcid.org/0000-0003-1183-9090 ; Department of Naval Architecture, Diponegoro University, Semarang, Indonesia
Berlian Arswendo Adietya orcid id orcid.org/0009-0008-6302-9165 ; Department of Naval Architecture, Diponegoro University, Semarang, Indonesia
Zulfaidah Ariany orcid id orcid.org/0000-0001-6978-8711 ; Industrial Technology Department, Vocational School, Universitas Diponegoro, Semarang, Indonesia
Aulia Windyandari orcid id orcid.org/0000-0002-9061-2750 ; Departemen Teknologi Industri, Sekolah Vokasi, Universitas Diponegoro, Semarang, Indonesia

* Corresponding author.

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Abstract

Catenary Anchor Leg Mooring (CALM) systems are vital for offshore oil and gas operations to moor Tankers and transfer cargo. A common issue arises when Tankers exceed the mooring system’s design capacity, leading to shifts in the Single Point Mooring (SPM) coordinate. This study examines the structural integrity of a 50,000 DWT CALM-type SPM system under excessive mooring loads, simulating conditions with Tankers of 55,000, 75,000, and 100,000 DWT. The analysis follows API RP 2SK, DNV OS E301, ABS standards and includes three stages: (1) Hydrodynamic analysis to obtain the Response Amplitude Operator (RAO); (2) 3D coupled dynamic time-domain simulation to determine mooring line tension; and (3) Von Mises stress analysis of the Y-connection. Results show that increasing tow loads elevate mooring line tension, with the highest force found in Chain 1C under beam sea with a 100,000 DWT Tanker. The maximum stress occurs at the Y-connection in hole C facing the seabed, failing to meet safety requirements. These findings highlight the critical need for adherence to design load limits to ensure safe and reliable mooring system performance.

Keywords

Mooring analysis; Tension analysis; Single point mooring; Tanker

Hrčak ID:

335896

URI

https://hrcak.srce.hr/335896

Publication date:

26.9.2025.

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