Enlarging the Cargo Hold of a Multi Purpose Vessel by Structural Reinforcement Complying With the SOLAS Regulations

2010 ◽  
Author(s):  
Santiago Uhlenbrock ◽  
Leshan Zhang
Keyword(s):  
Structural Strength ◽  
Probabilistic Method ◽  
Cost Benefit ◽  
Optimized Design ◽  
Stability Assessment ◽  
Structural Reinforcement ◽  
Damage Stability ◽  
Reference Design ◽  
Approval Procedure ◽  
Double Hull

The strict regulations of the actual SOLAS regarding damage stability may sometimes interfere with the design wishes of the ship owners. A reason may be that the approach stated in the SOLAS regulation is merely a probabilistic method. In this study the application of an alternative approval procedure to the pure probabilistic SOLAS damage stability calculations is presented. The procedure differs from probabilistic SOLAS regulations in the form that it considers the structural strength characteristics of the vessel design within damage stability assessment. A multi purpose vessel (MPV) with one large cargo hold is analyzed. A reference design complying with SOLAS regulations with a double hull width of 2.2m is optimized based on the alternative approval procedure and it is shown that the optimized design with ice class reinforcement and a double hull width of 1.5m has an equivalent level of safety. Thus, the double hull width could be reduced by 40% and the cargo hold breadth could be enlarged by 10%. This latter fact may be of particular interest for ship owners and designers as the flexibility of utilization of the vessel could lead to an improved cost benefit.

scholarly journals Conception and Evolution of the Probabilistic Methods for Ship Damage Stability and Flooding Risk Assessment

2021 ◽  
Vol 9 (6) ◽  
pp. 667
Author(s):  
Dracos Vassalos ◽  
M. P. Mujeeb-Ahmed
Keyword(s):  
Risk Assessment ◽  
Probabilistic Method ◽  
Probabilistic Methods ◽  
Full Description ◽  
Safety Level ◽  
Probability Of Survival ◽  
Damage Stability ◽  
Passenger Ships ◽  
Flooding Hazards ◽  
Flooding Risk

The paper provides a full description and explanation of the probabilistic method for ship damage stability assessment from its conception to date with focus on the probability of survival (s-factor), explaining pertinent assumptions and limitations and describing its evolution for specific application to passenger ships, using contemporary numerical and experimental tools and data. It also provides comparisons in results between statistical and direct approaches and makes recommendations on how these can be reconciled with better understanding of the implicit assumptions in the approach for use in ship design and operation. Evolution over the latter years to support pertinent regulatory developments relating to flooding risk (safety level) assessment as well as research in this direction with a focus on passenger ships, have created a new focus that combines all flooding hazards (collision, bottom and side groundings) to assess potential loss of life as a means of guiding further research and developments on damage stability for this ship type. The paper concludes by providing recommendations on the way forward for ship damage stability and flooding risk assessment.

scholarly journals Recent Advances in Damage Stability Assessment with Application on a Container Vessel

2018 ◽  
Vol 2 (Special edition 2) ◽  
pp. 167-184
Author(s):  
Boris Tomić ◽  
Anton Turk ◽  
Bruno Čalić
Keyword(s):  
Recent Work ◽  
Safety Assessment ◽  
Design Procedure ◽  
Computer Programs ◽  
Assessment Criteria ◽  
Container Ship ◽  
Stability Assessment ◽  
Damage Scenarios ◽  
Damage Stability ◽  
Damage Condition

The paper reviews the design procedure and recent work published on the topic of the damage stability and the safety assessment criteria that is established accordingly. The available damage scenarios must be designed prior to the safety assessment of a damaged ship. Another aspect of the discussions is an opinion on some problematic aspects of the damage stability regulations with practical aspects presented in literature very sparse and the fact that different computer programs may give divers outcomes. A little review on the damage stability requirements with its new regulations is given. Stability assessment is performed on a selected container ship using the Maxsurf software for both the intact and damage condition of the vessel, while the parameters related to damage stability are identified and categorized when developing deterministic and probabilistic damage scenarios.

SESSION 3A: SHIPBOARD DAMAGE STABILITY ASSESSMENT: FLOODING CASUALTY CONTROL SOFTWARE

1993 ◽  
Vol 105 (4) ◽  
pp. 114-114
Author(s):  
E. Henn ◽  
James W. Meyer ◽  
Peter B. Zahn ◽  
John Rosborough ◽  
Richard Carlstrom
Keyword(s):  
Stability Assessment ◽  
Control Software ◽  
Damage Stability

Cost Effectiveness of Scheffe’s Optimized Five-Component-Concrete with Mound Soil as a Mix Component

2011 ◽  
Vol 367 ◽  
pp. 33-40
Author(s):  
O.U. Orie ◽  
N.N. Osadebe
Keyword(s):  
Compressive Strength ◽  
Cost Benefit Analysis ◽  
Optimization Technique ◽  
Cost Benefit ◽  
Plain Concrete ◽  
Optimized Design ◽  
Fine Aggregate ◽  
Benin City ◽  
Concrete Mix ◽  
The Cost

The paper examined the cost benefit of optimized five-component-concrete mix. Mound Soil randomly selected from Iyeke-Ogba in Benin City was used as a case study of a fifth component in the concrete mix. The work applied Scheffe’s optimization technique to obtain concrete mix proportions. A mathematical model for the optimizing concrete of five components namely; cement, fine aggregate, mound soil, coarse aggregates and water/cement (w/c) ratio, was developed. Cube samples measuring 150mm x 150mm x 150mm were made with the developed mixes and compared with the results of a standard 1:2:4 mix. The samples were tested at 7, 14 and 28 days for compressive strength. The costs of producing a unit volume of the concretes were determined and compared. The results showed that the standard mix gave a 28th day maximum strength of at a w/c of 0.5 and the theoretically optimized design mix gave a mix proportion of 1.00:1.59:0.46:3.34:0.53 and a compressive strength of. This mix was tested experimentally and it gave, representing an increase of 15.33%. The cost benefit analysis showed that Scheffe’s optimized mound soil concrete, MSC was 15% more economical than the standard mix plain concrete.

scholarly journals Assessment of Survivability of Surface Combatants after Damage in the Sea Environment

2017 ◽  
Vol 33 (02) ◽  
pp. 156-165
Author(s):  
Evangelos Boulougouris ◽  
Stuart Winnie ◽  
Apostolos Papanikolaou
Keyword(s):  
North Atlantic ◽  
Probabilistic Approach ◽  
Weather Conditions ◽  
Operating Conditions ◽  
Stability Assessment ◽  
Stability Criteria ◽  
The North ◽  
Damage Stability ◽  
Damaged Stability ◽  
The North Pacific

The operating conditions of modern warships, in the natural sea environment, have a significant influence on their survivability in the event that watertight integrity is lost. Up to now, the consideration of sea and weather conditions has been implicitly accounted for in a naval ship's damaged stability assessment. This article outlines a probabilistic approach to assessing a naval ship's damage stability, in which some of the limitations of the currently used damage stability criteria are identified, including the validity of the assumption of moderate sea states at the time of damage. An investigation of the operability of a frigate design found that there is a significant increase in the risk of a ship's loss when changing the operational area from the North Atlantic to the North Pacific. A remarkable additional finding of the study showed that the assumed distribution for the damage penetration has no significant effect on the ship's survivability because of the way modern combatants are designed.

scholarly journals Foran Application on Damage Stability Assessment on a Container Vessel

2020 ◽  
Vol 3 (3) ◽  
pp. 227-238
Author(s):  
TOmislav Staničić ◽  
Mirko Toman Fernandez ◽  
Anton Turk ◽  
Damir Kolić
Keyword(s):  
Safety Assessment ◽  
Probability Distributions ◽  
Design Procedure ◽  
Container Ship ◽  
Stability Assessment ◽  
Training Process ◽  
Damage Stability ◽  
Technical Details ◽  
Automated Simulation ◽  
And Training

The paper focuses on two aspects. One is SENER incentives to work with the educational community by providing the FORAN software as a collaboration mean that centres on helping to develop the FORAN system, and the other way around the use of the FORAN system for academic purposes in universities, to improve and complement the teaching and training process for students. The second part of the paper focuses more on a technical details on the design procedure for the damage stability and the safety assessment criteria that is established accordingly. Stability assessment is performed using the FORAN software, with the creation of explicit damage events by a fully automated simulation, established from the uniformly distributed random numbers with given probability distributions for size and position of damage and an example on a container ship presented.

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