This document covers the analyses and developments of task 5.2 “Retrofitting consequences” within work package 5 “Structures & weight” relating to retrofitting solutions for actual single hull inland navigation tankers into double hull vessels and alternative solutions for the lengthening of inland navigation vessels. Innovative designs using lightweight structures and new materials such as composites are considered in order to assess their capabilities and benefits.

Two vessels are considered for the investigations:
• Single hull inland navigation tanker: MV “Internautic I“ with a length over all of 80.0 m and a cargo capacity of 1980 t at a draught of 3.63 m.
• Double hull multi-purpose cargo vessel: MV “HERSO I” with a length over all of 84.95 m and a cargo capacity of 1381.5 t at a draught of 2.70 m.

In order to meet the upcoming ADN regulations for the carriage of dangerous goods in 2018 where only vessels equipped with a double hull are permitted, various alternative double hull designs are investigated towards their feasibility as retrofit solution, namely:
• Steel/polymer-foam/steel double side structure
• λ-shape alternative steel structure
• Rubber bags with supporting structure

For the lengthening investigations the following composite variants are considered:
• Solid glass fibre reinforced polymer section
• Glass fibre reinforced polymer sandwich section
• Solid carbon fibre reinforced polymer section
• Carbon fibre reinforced polymer sandwich section

These innovative solutions are compared to the mandatory base steel double hull, complying with the current classification rules of Germanischer Lloyd and ADN requirements if applicable, to reveal benefits and drawbacks using computer aided design (CAD) tools and finite element analyses (FEA). A risk assessment completes the evaluation of the novel technologies.

Related documents are D 5.3 “Crashworthiness”, in which the capabilities in terms of side impact and grounding are presented, D 5.4 “Production”, where the economic assessment is conducted, and D 6.1 “Structures” as well as D 7.1 “System integration”, where ships are lengthened by conventional methods.

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D-5.2-Retrofitting-consequences_final.pdf