scholarly journals Structural design of double hull oil tankers for collision

2012 ◽  
Vol 16 (2) ◽  
pp. 61-67
Author(s):  
ELsayed Hegazy ◽  
Shiref Badran ◽  
Samy Youssef
Keyword(s):  
Structural Design ◽  
Oil Tankers ◽  
Double Hull

scholarly journals Normative and methodological principles for transverse webs structural design as applicable to cargo tank area of double hull oil tankers

2020 ◽  
Author(s):  
К.В. Плотников
Keyword(s):  
Design Process ◽  
Structural Design ◽  
Design Procedure ◽  
Direct Analysis ◽  
Design Parameters ◽  
Element Analysis ◽  
Structural Rules ◽  
Functional Relations ◽  
Oil Tankers ◽  
Double Hull

Статья посвящена вопросам проектирования поперечных танкерных рам крупнотоннажных нефтеналивных судов, размеры корпусных конструкций которых должны соответствовать требованиям Общих Правил МАКО (CSR). Требования Правил CSR можно разделить на общие нормативные предписания аналитико-эмпирического характера (prescriptive-требования) и требования к выполнению проверочных расчётов (в первую очередь с использованием МКЭ). В работе рассмотрены алгоритмы проектирования поперечных рам нефтеналивных судов в соответствии с prescriptive requirements, а также предложена методика и алгоритм проектирования таких конструкций, включающие и МКЭ-анализ, которые могут использоваться в практике конструкторских бюро. Приведено обоснование необходимости анализа и обобщения проектных решений в части рамных конструкций на реальных судах, которые могут быть использованы при разработке специализированного программного обеспечения. Поскольку напряжённо-деформированное состояние рамной конструкции зависит от соотношения характеристик изгибной жесткости составляющих её балок, целесообразным является построение алгоритма проектирования, частью которого является решение оптимизационно-поисковой задачи определения требуемых размеров конструкции. Ограничения такой задачи должны формироваться на основе общих требований CSR. В тексте приведено описание нормативных требований и основные их особенности. Кратко описаны возможные варианты постановки задачи и соображения о программной реализации её решения. The paper deals with principal considerations of double-hull oil tankers primary supporting members (PSM) structural design, which meets the requirements of Common Structural Rules (CSR). The algorithms of structural design procedure for different typical arrangements of tankers are considered in the paper. The study shows main features of structural design process that lead to complexity of functional relations. As CSR requirements consist of prescriptive requirements and direct analysis requirements (that usually means finite element analysis) the suggested algorithms include both of these stages. The text explains the need of statistical data of existing designs collecting. Such data includes ratios between required and actual web depths, scantlings of brackets, ratios between moments of inertia of PSM and some others. This data can be used in structural design process and form the limitations of design parameters. As shear forces and bending moments in primary supporting members depend on ratios of its bending stiffness and relation between design parameters are rather complicated it is appropriate to use mathematical programming models, which present a decision support instrument. There are many ways of formulation and implementation of structural design task, and the paper gives general considerations about it. The brief review of previous contributions on this subject is also given.

Product-Oriented Optimum Structural Design of Double-Hull Oil Tankers

2002 ◽  
Vol 18 (04) ◽  
pp. 237-248
Author(s):  
Seung-Soo Na ◽  
Dale G. Karr
Keyword(s):  
Structural Design ◽  
Random Search ◽  
Search Method ◽  
Design System ◽  
Structural Arrangement ◽  
Fabrication Cost ◽  
Interface Module ◽  
Random Search Method ◽  
Oil Tankers ◽  
Double Hull

A convenient interactive structural design system (ISSMID), which consists of a structural arrangement module, a scantling module, and an interface module, has been developed for the optimum design of double-hull oil tankers. The structural arrangement module defines the configuration and properties of the longitudinal, transverse, and transverse bulkhead members. The scantling module determines the scantling of the longitudinal, transverse, and transverse bulkhead members to obtain the minimum structural weight and fabrication cost. The interface module generates the data for the structural analysis (ANSYS/NASTRAN) and the CAD system (TRIBON/AUTOKON). This paper describes a new structural cost model developed by considering welding technique, welding poses, and assembly stages to manage the fabrication man-hour and process. Also, a multi-objective function method (random search method) is developed to find the minimum structural weight and fabrication cost. Several optimum structural designs are produced based on the Pareto optimal set obtained by the random search method. The design results are compared with existing ships.

Collision-Accidental Limit States Performance of Double-Hull Oil Tanker Structures: Pre-CSR versus CSR Designs

2009 ◽  
Vol 46 (04) ◽  
pp. 183-191
Author(s):  
Jeom kee Paik ◽  
Jae Hyung Park ◽  
Emmanuel Samuelides
Keyword(s):  
Finite Element ◽  
Structural Design ◽  
Limit State ◽  
Nonlinear Finite Element ◽  
Structural Performance ◽  
Limit States ◽  
Oil Tankers ◽  
Double Hull ◽  
The Impact ◽  
Oil Tanker

To mitigate the impact of consequences of ship collisions in terms of health, safety, and the environment, it has been made mandatory that hull structures of all oil tankers have double sides and double bottoms. In recent years, International Association of Classification Societies (IACS) has developed Common Structural Rules (CSR) for structural design of double-hull oil tankers on the basis of limit states, together with the traditional approach using the allowable working stress that has been a basis of pre-CSR. The application of CSR may result in some differences in terms of structural performance, among other aspects. The main objective of the present paper is to investigate the structural performance of CSRdesigned tankers associated with ship collisions. This aspect might be interesting, although CSR are not intended specifically to improve collision performance. As an illustrative example, an AFRAMAX-class double-hull oil tanker structure with same deadweight designed by both pre-CSR and CSR methods is studied by comparing their collision energy-absorption capabilities as obtained by nonlinear finite element methods. It is found that the collision performance of the CSR design could be improved by 5% to 25% compared with that of the pre-CSR design, depending on the accidental limit state criteria. However, it is concluded that the strength performance of the CSR vessel is similar to that of the pre-CSR vessel in terms of collision-accidental limit states, considering the uncertainties involved in conjunction with collision scenarios and nonlinear finite element method modeling techniques. Although the present study deals with some very specific scenarios of collisions, the insights and conclusions developed will still be useful for recognizing a structural design trend related to collision-accidental limit states

scholarly journals Rapid hull collapse strength calculations of double hull oil tankers after collisions

2016 ◽  
Vol 12 (5) ◽  
pp. 624-639 ◽  
Author(s):  
Muhammad Faisal ◽  
Sung Hwan Noh ◽  
Md. Rokan Uddin Kawsar ◽  
Samy A.M. Youssef ◽  
Jung Kwan Seo ◽  
...  
Keyword(s):  
Collapse Strength ◽  
Oil Tankers ◽  
Double Hull

Effect of corrosion on the ultimate strength of double hull oil tankers - Part I: stiffened panels

2012 ◽  
Vol 42 (4) ◽  
pp. 507-530 ◽  
Author(s):  
Do Kyun Kim ◽  
Dae Kyeom Park ◽  
Jeong Hwan Kim ◽  
Sang Jin Kim ◽  
Bong Ju Kim ◽  
...  
Keyword(s):  
Ultimate Strength ◽  
Stiffened Panels ◽  
Oil Tankers ◽  
Double Hull

Advanced Double Hull Structural Design Technology

1997 ◽  
Vol 109 (3) ◽  
pp. 117-127 ◽  
Author(s):  
J. Sikora ◽  
J. M. Grassman ◽  
P. Sensharma ◽  
J. Watts
Keyword(s):  
Structural Design ◽  
Design Technology ◽  
Double Hull

scholarly journals An analysis of building requirements for oil tankers in order To prevent maritime accidents

2018 ◽  
Vol 27 (2018) ◽  
pp. 31-34
Author(s):  
Corina Varsami ◽  
Ramona Tromiadis ◽  
Radu Hanzu-Pazara
Keyword(s):  
Oil Tankers ◽  
Double Hull

In this paper we intend to present the advantages of the double hull projects and to show how double hulled tankers are considered to be more secure in case of grounding especially if the soil is not too rocky.

FLOATING PRODUCTION, STORAGE AND OFFLOADING FACILITIES—IMPACT OF THE NEW OIL TANKER CONSTRUCTION RULES

1994 ◽  
Vol 34 (1) ◽  
pp. 178
Author(s):  
Robin C. Gehling ◽  
Michael P. Lane ◽  
Robert M. Thornton
Keyword(s):  
Oil And Gas ◽  
Oil And Gas Industry ◽  
Cooperative Effort ◽  
Gas Industry ◽  
Safety Certification ◽  
Offshore Industry ◽  
Offshore Oil And Gas ◽  
Oil Tankers ◽  
Offshore Oil ◽  
Double Hull

FPSOs are often converted from, and carry ship safety certification as, oil tankers. The two types of ship have been reasonably compatible until passage in early 1992 of new international requirements for tankers to be constructed or converted to double hull requirements and for existing vessels to be phased out when they have been in service for 25 to 30 years. Such requirements, which have become increasingly onerous since 1973, are based on the hazards involved in navigation of oil tankers and do not reflect the risks applying to FPSO operations.In cooperation with the Australian offshore industry, AMSA made a number of submissions to the International Maritime Organisation (IMO), seeking clarification on whether FPSOs should be subjected to the rules for oil tankers. To cover the possibility that it is confirmed that FPSOs should comply with the rules, the submission proposed modifications to those rules to reflect the FPSO operating environment.The submissions resulted in IMO deciding, in March 1993, that although FPSOs would continue to be treated as oil tankers, they would not be required to comply with the double hull requirements which could have necessitated their withdrawal from service upon reaching 30 years of age.Achievement of a successful conclusion to this project has involved a cooperative effort between AMSA and the offshore oil and gas industry.

Ramification Study on IACS Harmonized Common Structural Rules: Impact on Structural Design and Scantlings

2014 ◽  
Author(s):  
Wu Jiameng ◽  
Wang Gang ◽  
Cai Shijian
Keyword(s):  
Structural Design ◽  
Classification Rule ◽  
Design Parameters ◽  
Functional Requirements ◽  
Safety Level ◽  
Structural Rules ◽  
Bulk Carriers ◽  
Common Structural Rules ◽  
Oil Tankers ◽  
New Criteria

The Harmonized Common Structural Rules (CSR-H) for Bulk Carriers and Oil Tankers has been issued on 1st Jan 2014, and will enter into force on 1st July 2015 to supersede the current two separate CSR versions, namely CSR-OT for Oil tankers and CSR-BC for bulk carriers. CSR-H aims at a consistent methodology harmonizing CSR-OT and CSR-BC, and establishes new criteria and requirements with the further aim of compliance with the IMO Goal Based Standard (GBS) where GBS functional requirements fall within Classification Rule scope. To maintain equivalent or higher safety level than current CSR, the rule developments within CSR-H are as a guideline aimed at scantling requirements that will be the same or higher for a given CSR vessel given the same ship design parameters and structural arrangement both globally and locally. The purpose of this study is to introduce the main changes from CSR to CSR-H, the new criteria set up for GBS compliance, and evaluate their impact on the structural design, especially on the scantlings. A carefully selected set of ten bulk carriers and eight oil tankers are investigated with the focus not only on the midship area but also on the foremost and aftmost cargo block areas as well. The typical critical areas affected by CSR-H due to fatigue or buckling criteria are identified, discussed and analyzed in detail. The impacts on scantlings and improvement suggestions for structural design based on CSR-H are further summarized and conclusions made.

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