Overview
EN ISO 12215-6:2018 (ISO 12215-6:2008) is part of the ISO 12215 series on small craft hull construction and scantlings. It focuses on structural arrangements and details for monohull and multihull small craft built from fibre reinforced plastics (FRP), aluminium or steel alloys, wood or other suitable boatbuilding materials, with hull length up to 24 m (as defined in ISO 8666). The standard complements ISO 12215-5 by providing expanded explanations, calculation procedures and worked examples, and it gives examples of good-practice arrangements that can be used as benchmarks via the equivalence criteria in the text.
Key topics and technical coverage
The standard addresses practical design and detailing matters rather than introducing new load models. Major topics include:
- General structural arrangement: stiffening, hull girder strength and load transfer principles.
- Stiffener design: determination of spans and shear/stress considerations.
- Openings and penetrations: window mullions, hull drainage and hull penetrations.
- Rig and mast supports: sailboat mast support and introduction/distribution of rigging loads.
- FRP-specific details: local reinforcement, bonding, major joints, laminate transitions, sandwich construction, attachment of fittings, engine seatings and girders.
- Metal construction: plate and stiffener details, end connections, increased hull plating, protective keel arrangements, welding and riveted/adhesive bonding good practices.
- Laminated wood practice: edge sealing, plywood orientation and local scantlings.
- Other components: rudder structure and connections, keel attachments, machinery spaces.
- Informative annexes: examples for category C and D craft, shear stress determination for stiffeners, welding procedures and longitudinal strength analysis.
Practical applications and users
This standard is intended for anyone involved in the design, construction, assessment or certification of small craft up to 24 m, including:
- Naval architects and marine engineers designing hull structure and details.
- Boatbuilders and production engineers implementing structural details for FRP, metal or wood construction.
- Classification societies, conformity assessors and surveyors using the guidance to benchmark alternative arrangements.
- Regulatory bodies and CE assessors - EN ISO 12215-6:2018 supports conformity assessment under EU Directive 2013/53/EU where cited.
Practical uses include preparing structural drawings, checking scantlings and joint details, specifying welding or bonding practices, and demonstrating equivalence of novel details against established good practice.
Related standards
- ISO 12215-5 (design pressures, stresses and scantlings determination) - supported by Part 6.
- Other ISO 12215 parts: 1–4, 7–9 (materials, workshop, multihulls, rudders, appendages).
- ISO 8666 (defines hull length used by this part).
Keywords: EN ISO 12215-6:2018, ISO 12215-6, small craft, hull construction, structural arrangements, scantlings, FRP, aluminium, steel, wood, boatbuilding.
