Disposal and Recycling of HSC Materials
Henning Gramann, Reinhard Krapp, Karsten Fach

Enhanced Hazard Mapping on a Medium-Resolved
Torsten Schlurmann, Nils Goseberg

A comparative analysis of semi-empirical formulations for wall thickness design of sub sea pipelines
Sushrut S. Vaidya, Ashoke Bhar

Calculation of Weight of a SWATH Ship in Preliminary Design Stages
Angela P. Boiko, Alexander V. Bondarenko, Ph.D.

Manoeuvrability Assessment of Underwater Vehicles: moving from analysis to optimization
LtCdr Amit Ray, Prof S.N Singh, Prof. V Seshadri

BACK COVER, Vol. 5, No. 2, July 2009

Disposal and Recycling of HSC Materials
Henning Gramann, Reinhard Krapp, Karsten Fach

 ABSTRACT
The introduction gives an overview of current IMO activities concerning the disposal of ships at the end of their life-cycle and an overview of composite materials applications in ships. After a brief discussion of relatively unproblematic aluminum alloys, the article focuses on problems for composite materials. There is little experience for end of life treatment of composites in general and in the shipbuilding industry in particular. New legislation might regulate handling and disposal of these materials even further. The article identifies existing solutions as well as open questions.

Keywords: IMO convention, ship recycling, high speed craft, disposal of composites, inventory of hazardous materials

Enhanced Hazard Mapping on a Medium-Resolved
Torsten Schlurmann, Nils Goseberg

ABSTRACT
In-depth studies of inundation dynamics extracted from tsunami simulations could contribute widely to detailed information about velocity fields and flow depth in demand for adequate evacuation routines in coastal urban areas with the main purpose to enhance proper disaster management planning processes. The present study takes the city of Padang, West Sumatra, Indonesia, into closer consideration for detailed analysis of tsunami inundation risks. In this context, the paper presents a 2D numerical study that is used to evaluate relevant factors influencing the quality and reliability of the simulation results. Predominant features are revealed such as accuracy and resolution of the underlying digital elevation model as well as the influence of macro-roughness elements like buildings and other infrastructure which significantly affect flow fields and water depths on microscopic level. Other factors such as the location of the epicenter and the moment magnitude appear to be likewise crucial. The results clearly show that attention must be drawn to the fact that it is highly important to collect and analyze highly-resolved spatial data in shallow water and near shore (on land) in order to deduce credible tsunami inundation scenarios as a basis for adequate coping and evacuation strategies for imperiled coastal regions.

Keywords: Tsunami; Numerical modeling; Inundation scenario; Wave Run-up Digital elevation model; Indian Ocean; Earthquakes.

A comparative analysis of semi-empirical formulations for wall thickness design of sub sea pipelines
Sushrut S. Vaidya, Ashoke Bhar

ABSTRACT
Structural design of a subsea pipeline mainly involves determination of the wall thickness to be provided in order to ensure that the pipeline is safe against failure in various modes. The design formulations commonly used in the subsea pipeline industry are semi-empirical in nature. Subsea pipeline experts have pointed out that semi-empirical methods are found to be in closer agreement with experimental results than theoretical methods. Theoretical methods are unable to accurately account for the effects of geometric imperfections and residual stresses. . However, it has also been pointed out that many of these semi-empirical design formulations do not have adequate theoretical background: some are based purely on dimensional analysis. This paper presents a comparative analysis of two sets of semi-empirical design formulations used in the subsea pipeline industry, and tries to shed some light on the relative safety levels of these formulations.

Keywords: Sub sea pipelines, semi-empirical design formulations, wall thickness, burst pressure, collapse pressure, propagating pressure, initial ovality.

Calculation of Weight of a SWATH Ship in Preliminary Design Stages
Angela P. Boiko, Alexander V. Bondarenko, Ph.D

ABSTRACT
The review of existing calculated formulas for definition of components of displacement of small waterplane area twin hull (SWATH) ships has been carried out. The approached dependences for calculation of weight of SWATH ship in preliminary design stages are described in the paper.

Keywords: weight, SWATH, lightship weight, hull weight, outfit weight, machinery weight.

Manoeuvrability Assessment of Underwater Vehicles: moving from analysis to optimization
LtCdr Amit Ray, Prof S.N Singh, Prof. V Seshadri

ABSTRACT
Although techniques to analyse the manoeuvring performance of a selected design configuration for underwater vehicles have become increasingly sophisticated, these techniques may not be suitable to explore a wider range of options during initial design. This paper examines parametric design requirements for manoeuvring studies of underwater vehicles. The mathematical models and hydrodynamic coefficients used for manoeuvring simulation and for motion stability analysis are outlined. Using semi-empirical 'slender body' approach, parametric studies are presented for optimizing the size of control surfaces and hull length to meet vertical plane motion stability requirements as a function of centre of gravity position and vehicle speed. It is shown that while analysis may merely give decisions for acceptance/ rejection, there is scope for fine-tuning design parameters using semi-empirical methods that are amenable to quick calculations.

Keywords: underwater vehicles; Submarines, manoeuvrability, controllability; slender body.