Status Report: Lightweight Structures at Sea

Tommy Hertzberg
Thursday, December 19, 2013
Figure 1: Valö, the world’s first HSC-classed vessel built in carbon fiber composite, owned by Styrsöbolaget in Sweden.

SP Fire Technology’s involvement in fire-resistant lightweight materials for marine applications has contributed to the construction of several smaller lightweight vessels, and to the current discussion within the International Maritime Organization (IMO) of how larger ocean-going vessels could be built using plastic composites.

Background
2005 saw the start of the LÄSS project, which clearly showed the potential economic and environmental benefits of using lightweight materials such as aluminum or fiber-reinforced polymer (FRP) composite for the construction of ships. The project was financed by VINNOVA and coordinated by SP Fire Technology. The follow-on project, LÄSS-k, investigated the use of composite structures for cruise vessels with various partners, including the German Meyer-Werft shipyard.

Since then, SP Fire Technology has participated (and continues to participate) in EU projects (“BESST”, “Fire Resist”), worked in conjunction with other EU projects (“SafeDor”, “Delight Transport”) and been involved in international military projects (“Convince”) investigating the use of FRP composites in vessels.

The Swedish “TankLightModule” project investigated the use of lightweight superstructures on a tanker, while the joint Danish/Swedish Eco-Island ferry project compared a traditional coast-going ferry built in steel with one built using composites. SP Fire Technology has also participated in a number of commercial projects concerning lightweight vessel designs.

These projects have given us a very wide contact interface with companies, research groups and public authorities in Sweden and Europe. We have organized four international lightweight conferences and have been managing S-LÄSS, the Swedish network for maritime lightweight design for a number of years, bringing together about thirty participating organizations.

IMO’s Rule 17: a condition
The research projects and development that have been carried out have been made possible by the function-based regulation added to IMO’s SOLAS (Safety of Life at Sea) 2002 Regulations, the Regulation 17: “Alternative design and arrangements”. The rule permits vessels to be built using materials other than steel provided that the flag state’s representative (in Sweden, the Swedish Transport Agency) approves the design and construction. This, in turn, requires documentation showing an adequate safety level.

SP Fire Technology has paid particular attention to methods of assessing fire risks, based on overall risk analysis and on the IMO regulations. Extensive series of experiments have been performed, complemented by the use of simulation tools. In recent years, our work has also been extended to include investigation of acoustic and vibration properties of lightweight materials, methods of joining materials and of economic and ecological life cycle analyses for vessels.

Concrete research results
Results from the research projects have been applied in construction of the world’s two first fully certified High Speed Craft catamarans in carbon fiber composites, Valö and Rivö. Both vessels are owned by Styrsöbolaget/Veolia, and are in service in the Göteborg archipelago. The company has been able to halve transport times, which is important for development on the islands, at the expense of only slightly higher fuel consumption.

Results from the research also provided the basis for design of CarboCat, a maintenance vessel built in carbon fiber composite for offshore applications and launched by Kockums AB in 2010.

October 1, 2010 saw the introduction of more stringent rules for SOLAS-classified vessels concerning the quantity of combustible interior materials. One vessel that did not meet the new requirements was the Birger Jarl, which was in service between Stockholm and Åland. Rebuilding the ship from its 1953 design was regarded as too expensive, and there was a risk that the line might be closed. SP Fire Technology carried out a fire risk assessment in accordance with the method that had been developed in the composite projects, and produced a fire protection solution that met the requirements at a considerably lower cost. The Swedish Transport Agency notified IMO in August 2011 that it had approved an alternative design of the Birger Jarl in accordance with the SOLAS regulations, and the work on the vessel was completed in October.

Large vessels in composite materials
IMO is a UN body, consisting of representatives of all the world’s flag states. It is responsible for maritime safety and environmental matters, with working groups meeting every year to discuss its rules.

The IMO Fire Sub-committee met in London in January 2013, when one of the matters under discussion was the use of FRP composites. A substantial majority of the delegates were in favor of the material, but wanted to see guidelines developed for assessment of fire safety. This resulted in the establishment of a correspondence group under the leadership of the Swedish Transport Agency, which is due to present its proposals within a year. This work is an important step towards greater acceptance of FRP composites on SOLAS vessels. SP Fire Technology is an expert member of the Swedish delegation.

Growing use of lightweight materials
The main driving forces behind the introduction of lightweight vessels are environmental considerations and fuel costs, although other factors such as corrosion resistance, stability, weight, insulation, length of life etc. all favor greater use of lightweight materials. Smaller vessels made from FRP composites (or aluminum) are already in use in national traffic, and several commercial projects are in progress or about to start. A strongly growing demand for service vessels for the offshore sector, together with an ageing fleet of vessels in coastal traffic in Europe, are expected to result in a major increase in the number of lightweight vessels. IMO’s discussions, together with the work of the Swedish-led correspondence group, are in turn expected to result in a growing number of composite designs for larger vessels.

The newer versions of the “Naval Ship Code” (the military equivalent of SOLAS, published by NATO) permit the use of FRP composites without requiring a special fire risk assessment. The material is already in use today, in both smaller and larger naval vessel designs, with interest in its use on the increase. Two Indian corvettes, for example, will incorporate composite superstructures that are now being made at the Kockums’ Karlskrona shipyard.

One working area under development is that of the use of FRP composites in offshore structures. As with ships, such structures are affected by stability problems due to high structural weights. A first project, carried out by SP Fire Technology, has demonstrated good potentials for reduction of the weights of traditional platform structures at sea through the use of FRP composites.

Summarizing, FRP composites will hardly replace all steel used in vessels or offshore structures, but are likely to be used considerably more than is the case today. Rising oil prices, environmental concern and the prospects for stability improvement, longer life and reduced maintenance costs, all create very favorable conditions for greater use of composite structures at sea.
 

  • Figure 2: Kockums’ service/maintenance vessel, built from carbon fiber-reinforced composite.

    Figure 2: Kockums’ service/maintenance vessel, built from carbon fiber-reinforced composite.

Maritime Reporter March 2015 Digital Edition
FREE Maritime Reporter Subscription
Latest Maritime News    rss feeds

Shipbuilding

All American Marine Delivers Ferry to Seattle

All American Marine, Inc. (AAM) today announced the delivery of a new passenger ferry that will serve the city of Seattle.    The vessel, MV Sally Fox, was dedicated

Baltic Sea Freight Index Up on Higher Capesize Rates

The Baltic Exchange's main sea freight index, which tracks rates for ships carrying dry bulk commodities, rose on Tuesday, mostly on higher capesize rates.   The index,

ST Marine Celebrates Naming of Vessels

Singapore Technologies Marine Ltd (ST Marine), the marine arm of Singapore Technologies Engineering Ltd (ST Engineering), held the Naming Ceremony today for the second Patrol Vessel (PV),

Marine Materials

H2O’s Owens CrapZapper Offers More

H2O’s Owens CrapZapper marine sanitation device has dual certification to the latest IMO and USCG standards for operation anywhere in the world.   Features include low maintenance,

Schmiedag and Wildauer Schmiedewerke: 'We Forge Partnerships'

Olaf Wiertz, Sales Director at Schmiedag GmbH (SDG) and Wildauer Schmiedewerke GmbH & Co. KG (WSW) said: “We are more than just a supplier to our customers – we are their partner.

Dometic’s Workboat Play

Workboat operators are taking a second look at Dometic’s SeaXchange Reverse Osmosis Systems as missions expand and demands on these vessels increase. It’s no secret

Maritime Safety

WaPo: Two German CEOs Launching Own Mediterranean Rescue

The Washington Post has a story today about two German men who are launching their own rescue mission to save migrants crossing the Mediterranean.   Harald

Palfinger Chooses NAMJet Waterjets

Netherlands-based Palfinger Boats has launched the first of two Damen-designed FRSQ 1200 fast-rescue/oil response vessels.   Built in Harderwijk, Netherlands,

Japan, U.S. Look to Expand Naval Cooperation

Japanese Prime Minister Shinzo Abe's push to allow Tokyo to come to the aid of an ally under attack will pave the way for closer cooperation between U.S. and Japanese forces across Asia, a top U.

Vessels

DryShips to Sell its Suezmax Tanker Fleet

DryShips Inc. (NASDAQ: DRYS), has announced  that it has entered into firm sales agreements with entities controlled by the Company's Chairman and Chief Executive Officer,

Shipbuilding: Mitsui Delivers Bulk Carrier

Mitsui Engineering & Shipbuilding Co., Ltd. (MES) completed and delivered a 56,000 dwt type bulk carrier M.V. Desert Osprey (MES Hull No. 1862) at its Chiba Works

ST Marine Celebrates Naming of Vessels

Singapore Technologies Marine Ltd (ST Marine), the marine arm of Singapore Technologies Engineering Ltd (ST Engineering), held the Naming Ceremony today for the second Patrol Vessel (PV),

 
 
Maritime Careers / Shipboard Positions Maritime Security Navigation Pod Propulsion Port Authority Salvage Ship Electronics Shipbuilding / Vessel Construction Sonar Winch
rss | archive | history | articles | privacy | terms and conditions | contributors | top maritime news | about us | copyright | maritime magazines
maritime security news | shipbuilding news | maritime industry | shipping news | maritime reporting | workboats news | ship design | maritime business

Time taken: 0.1817 sec (6 req/sec)