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13 publications

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    STRUCTURAL DESIGN ANALYSIS OF FPSO HULL TOPSIDE INTERFACE

    By Ozgur Ozguc

    Abstract: This paper aims to address the structural challenges in conjunction with the design and analysis of topside module support structures for installation on Floating Production Storage and Offloading (FPSO) vessel. The most common topsides foundation concepts applied on FPSOs are identified, and discusses the consequences of each configuration for the layout of the unit in associated with the design of the hull structure and the topsides. Further, the information needed …

    Published in Journal of Offshore Structure and Technology · Vol. 5, Issue 3, 2018 · pp. 27–35 Read article

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    Consideration of Collision Damage in FPSO Structural Design

    By Ozgur Ozguc

    Abstract: AbstractA collision event may be catastrophic for an offshore facility or a floating production, storage and offloading unit (FPSO). Depending on the size and speed of the impacting ship, anything from damage to hull rupture, oil pollution, flooding, loss of buoyancy, capsizing, and sinking may occur. Supply vessels and tankers frequently visit the FPSO to transport consumables and chemicals and, consequently, there is a risk of collision between two structures. …

    Published in Journal of Offshore Structure and Technology · Vol. 5, Issue 2, 2018 · pp. 1–21 Read article

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    Strength Analysis of Topside Supports on FPSO Hull

    By Ozgur Ozguc

    Abstract: AbstractThis paper is performed to determine strength and endurance capacity of topside supports and underlying hull structure on Floating Production Storage Offloading (FPSO) platform. Support stools shall be installed on every intersection between longitudinal bulkheads and transverse frames. Strictly, the analysis is relevant to topside supports and hull structure in the mid-ship area away from the moon-pool, but modification of the results to be representative for the moon-pool area is …

    Published in Journal of Offshore Structure and Technology · Vol. 5, Issue 2, 2018 · pp. 22–38 Read article

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    Fatigue Assessment for Pump Tower Tubular Joints under Partial Penetration Welds

    By Ozgur Ozguc

    Abstract: ABSTRACT In this paper the fatigue capacity of the tubular joints of the tripod pump tower structure installed in the cargo tanks of membrane type LNG vessels is studied using fatigue assessment methodology specified in Class Code such as DNVGL-RP-0005 [1]. The stress concentration factors and the S-N curve used in this methodology are normally valid for the weld toe location where fully penetration weld is applied. The current study …

    Published in Journal of Offshore Structure and Technology · Vol. 4, Issue 2, 2017 · pp. 1–27 Read article

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    Modelling and Structural Analysis of Ice Strengthened Vessel

    By Ozgur Ozguc

    Abstract: Abstract In this paper, one global and one local FE-model are developed in order to calculate the response of ice loading on an ice strengthened 100.000 DWT oil carrier. A global analysis is performed by applying loads in two different areas in the bow region. The deformations of the global model are used as boundary conditions in the analysis of the local model. In each of the two areas, the …

    Published in Journal of Offshore Structure and Technology · Vol. 4, Issue 1, 2017 · pp. 11–20 Read article

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    Evaluation of Buckling Response on a Semi-Submersible Platform

    By Ozgur Ozguc

    Abstract: Abstract The primary aim of the present paper is to investigate the buckling strength assessment of a stiffened deck panel on a semi-submersible platform by means of the nonlinear finite element code ADVANCE ABAQUS. Comparison is performed with the PULS buckling code for stiffened panels. The cases studied correspond to in-plane bi-axial compression in the two orthogonal directions. An imperfection sensitivity study is also accounted for. The strength values from …

    Published in Journal of Offshore Structure and Technology · Vol. 3, Issue 3, 2016 · pp. 16–24 Read article

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    Comparative Study on Fatigue Analysis Methods using Turret-moored FPSO Model

    By Ozgur Ozguc

    Abstract: Abstract Floating structures are prone to fatigue due to high cyclic loads mainly caused by waves and changing loading conditions. Therefore, fatigue is an important criterion during design. The fatigue life is dependent upon factors such as global and local design, workmanship during construction, maintenance, corrosion protection, and trade and load history. Different approaches are applied to the fatigue strength assessment. Longitudinal stiffener end connections are also important structural elements …

    Published in Journal of Offshore Structure and Technology · Vol. 3, Issue 3, 2016 · pp. 1–15 Read article

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    Structural Assessment for Conversion of Tanker to FPSO Unit

    By Ozgur Ozguc

    Abstract: Abstract This paper addresses the structural assessment for conversion of tanker to floating, production, storage, and offloading (FPSO) in Gulf of Mexico (GoM) specified site by means of the independent analyses in accordance with CLASS Ship and Offshore Codes. The main objectives of the work are: To verify compliance with the CLASS Offshore Codes regarding structural capacity of the hull.To verify the used and remaining fatigue life of the structural …

    Published in Journal of Offshore Structure and Technology · Vol. 3, Issue 1, 2016 · pp. 25–39 Read article

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    Fatigue Assessment of Longitudinal Stiffener End Connections for Ageing Tankers

    By Ozgur Ozguc

    Abstract: Abstract The world tanker fleet is ageing. In this situation it is essential to ensure that the transportation of oil and gas is carried out by quality vessels. This is possible with old tankers as long as their condition can be properly assessed. Since the 80’s relatively few new-buildings have been ordered and this has opened for operation of tankers up to 30 years of age. Ship and offshore structures …

    Published in Journal of Offshore Structure and Technology · Vol. 3, Issue 1, 2016 · pp. 1–12 Read article

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    Empirical Interaction Design Equations for the Ultimate Longitudinal Strength of Tankers, Bulk Carriers, Container Ships and General Cargo under Coupled Bending Moment

    By Ozgur Ozguc

    Abstract: This

    Published in Journal of Offshore Structure and Technology · Vol. 2, Issue 3, 2015 · pp. 53–75 Read article

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    Modelling Structural Damage in FPSO Collisions

    By Ozgur Ozguc

    Abstract: While the oil operators become more interested in developing oil and gas in deeper and more remote offshore locations, there should be further research and development that focuses on collision assessment of floating structures, especially ship-shaped floating production, storage and offloading units (FPSOs). The focus of this paper is on general methodology and design accident scenarios for FPSOs using more sophisticated tools such as the nonlinear FEM used so that …

    Published in Journal of Offshore Structure and Technology · Vol. 2, Issue 3, 2015 · pp. 23–52 Read article

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    Fatigue Design of Anode Supports on Offshore Structures

    By Ozgur Ozguc

    Abstract: This paper addresses the fatigue analyses results for external and internal anodes’ attachments on the offshore structures using finite element analysis, where a simplified empirical formula is also recommended. For anodes that may become subject to significant forces during installation and operation, the design of anode fastening devices shall be addressed in early design stage. Doubler and/or gusset plates may be required for large anodes. The anode steel should be …

    Published in Journal of Offshore Structure and Technology · Vol. 2, Issue 2, 2015 · pp. 52–63 Read article

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    Fatigue Assessment of Flare Foundations on FPSO Structure

    By Ozgur Ozguc

    Abstract: This paper addresses the fatigue analysis results of the new-built FPSO’s flare tower foundations and associated the hull which is supporting the four cylindrical legs of the flare. Flare foundation is checked for fatigue resistance both in “towing” and “on site” conditions. The fatigue design of the flare supporting structure is to take into account the inertia loads due to wave motions in towing and on site, but also the …

    Published in Journal of Offshore Structure and Technology · Vol. 2, Issue 2, 2015 · pp. 1–18 Read article

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