In-depth | COMPOSITES
cost that would be paid back within five years. The results of this investigation were presented in June at the 2011 Donsö Fair. As a direct result of the presentation, a commercial project was initiated that involved several of the S-LASS network members. “One benefit of plastic composites
rather than metallic materials is that it is easier to produce them in specific shapes, e.g. in order to reduce air resistance”, highlights Hertzberg. Summarising the project, it was
found that the potential for both environmental and economic benefits were
substantial using lightweight
materials for and in superstructures, on a tanker of this size.
Eco-Island-ferry In 2010, the first fully certified plastic composite high speed craft (HSC), was put in use by the Swedish ship owner Styrsöbolaget, owned by Veolia. The use of combustible construction materials is allowed by the HSC code, but not by the European code regulating fire safety on a displacement
ferry. However,
the European directive 2002/25/EC for passenger vessels does permit the use of the procedure outlined in SOLAS Reg 17, “Alternative design and Arrangements”, by which it is possible to demonstrate sufficient level of fire safety when using e.g. a combustible construction material. “The fleet of displacement ferries within the archipelagos of Europe is quite old and it is not uncommon to find companies owning vessels that are 25 years or more on average. They are further often built with a surplus of robustness and engine power in periods when fuel cost and environmental concern was not the main issue”, highlights Hertzberg. There is a need for ecologically and
economically sound displacement ferries and wan aging fleet is the background for
the “Eco-Island-
ferry” project. The project involves several S-LASS companies, but also participants from Denmark through a cooperation with the ERANET-project “MARKIS” . In this S-LASS project, naval architects together with national
30
Table 1. Comparison between the old steel ferry and the new design in carbon fibre composite.
authorities, shipyards and fire experts are looking at the potential for building displacement passenger ferries from plastic composites. The project is financed by a Swedish fund (Västra Götalandsregionen) and a Danish fund (The Danish Maritime Fund). The Danish Tunö ferry has been chosen as the reference object for the project, and is redesigned from steel to carbon fibre based composite material. Some preliminary weight
results
from the study are shown in Table 1. The estimated displacement of the
new ferry is thus only about 35% of the old steel ferry. The lightweight includes an estimated amount of fire insulation and the fire/risk analysis will have to show whether this weight should be adjusted. In any case, the project results indicate that a substantial amount of weight savings will be achievable. The fire safety level of the new design is being analysed in accordance to the EC passenger ship directive in order to show that the same degree of fire safety will be achieved as when applying prescriptive requirements.
Other S-LASS activities The S-LASS network organises seminars and courses
two to three
times per year where issues relating to light weight materials in ship building are discussed. Scientific research is presented together with industrial applications and regulatory questions. The network is also involved in the organisation of the LIWEM conference (Light weight Marine Structures). Further information on the network can be found at
www.s-lass.com. NA
Reference •
www.lass.nu
• Hertzberg T et. al, LASS, Lightweight Construction Applications at Sea, SP
• Hertzberg T., Lessons learnt on lightweight materials, The Naval
Report 2009:13
• Evegren F., Hertzberg T., Rahm M., LASS-C, Lightweight construction of
a cruise vessel, SP Report 2011:12 •
www.s-lass.com
•
www.besst.it
• MSC 87/24/9 Proposal for identification of new regulations
•
www.eranet.eu •
www.liwem.org
required for use of composite materials in ship building, Submitted by UK, 2010-02-09
The Naval Architect May 2012
Architect, July/August 2007, pp 38-39
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