A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Economics of high-tensile steel in ship hulls
AbstractDuring the last decade there has been an increase in the use of high-tensile steel in ship hulls. Initially, high-tensile steel was used in the deck and bottom structure, but lately it has also been used in side-structure and transverse elements. This has given more optimised ships, in terms of both reduced steel weight/investment costs and increased earning potential by increased deadweight.The reduction in the scantlings due to high-tensile steel has in some cases given higher repair costs due to an increased number of fatigue cracks and steel replacement due to corrosion. A net present value (NPV) assessment of the total cost benefit is therefore performed for a life span of 20 years with extensive, partial or moderate use of high-tensile steel versus mild steel. The analysis studies important factors to reduce life-cycle costs of ship hull structures, and aims to increase the awareness of the implications of using high-tensile steel in ship hulls.A VLCC complying with the DnV Rules for fatigue and corrosion protection is used as a case study. The cost benefits are evaluated and consider investment costs, including steel weight, material price, coating systems, and production costs for different grades of high-tensile steel application, and operating costs including maintenance strategies, corrosion margins, fatigue, repair costs, etc.Since most of the cost items are uncertain estimates of the future, a probabilistic method is applied. This approach gives additional benefit in providing valuable sensitivity measures.
Economics of high-tensile steel in ship hulls
AbstractDuring the last decade there has been an increase in the use of high-tensile steel in ship hulls. Initially, high-tensile steel was used in the deck and bottom structure, but lately it has also been used in side-structure and transverse elements. This has given more optimised ships, in terms of both reduced steel weight/investment costs and increased earning potential by increased deadweight.The reduction in the scantlings due to high-tensile steel has in some cases given higher repair costs due to an increased number of fatigue cracks and steel replacement due to corrosion. A net present value (NPV) assessment of the total cost benefit is therefore performed for a life span of 20 years with extensive, partial or moderate use of high-tensile steel versus mild steel. The analysis studies important factors to reduce life-cycle costs of ship hull structures, and aims to increase the awareness of the implications of using high-tensile steel in ship hulls.A VLCC complying with the DnV Rules for fatigue and corrosion protection is used as a case study. The cost benefits are evaluated and consider investment costs, including steel weight, material price, coating systems, and production costs for different grades of high-tensile steel application, and operating costs including maintenance strategies, corrosion margins, fatigue, repair costs, etc.Since most of the cost items are uncertain estimates of the future, a probabilistic method is applied. This approach gives additional benefit in providing valuable sensitivity measures.
Economics of high-tensile steel in ship hulls
Løseth, Robert (author) / Sekkesæter, Geir (author) / Valsgård, Sverre (author)
Marine Structures ; 7 ; 31-50
1993-03-04
20 pages
Article (Journal)
Electronic Resource
English
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