BS EN ISO 6185-3:2018 ISO 6185‑3:2014


ISO 21487, Small craft— Permanently installed petrol and diesel fuel tanks


3 Terms and definitions For the purposes of this document, the following terms and definitions apply.


3.1 inflatable boat


buoyant structure (hull), achieving all or part of its intended shape and buoyancy by the medium of inflation and which is intended for the transportation of people and/or loads on the water, and where the design and shape of it gives it the capability of withstanding forces and movements arising from sea conditions


3.2 rigid inflatable boat


buoyant structure comprising two essential parts: a lower hull formed by a rigid structure achieving part of its intended shape and a non-rigid buoyancy tube(s) that is of either inflatable or foam-filled type and where the volume of the buoyancy tube(s) comprises not less than 50% of the total required buoyant volume of the boat (3.4)


Note 1 to entry: Tubes made from rigid aluminium, rotomoulded polyethylene, GRP or other rigid materials are excluded.


3.3 buoyancy of an inflatable boat


buoyancy of all chambers which form the inflatable hull, plus any other buoyant component which is permanently fixed to it


Note 1 to entry: The term “permanently fixed” implies detachment is only possible by the use of tools


3.4 total buoyant volume (V)


buoyancy comprising the buoyant volumes of the inflatable buoyancy tube (3.5) and the foam filled buoyancy tube (3.6) added to the permanent inherent buoyancy (3.7) added to the permanent sealed buoyancy (3.8) added to the inherent buoyancy of the rigid parts of the boat


3.5 inflatable buoyancy tube


multi-chambered tube attached to the length of both port and starboard sides of the hull when the boat is in use, and inflated with air


3.6 foam‑filled buoyancy tube


buoyancy tube attached to the length of both port and starboard sides of the hull when the boat is in use, and filled with resilient closed cell type foam


Note 1 to entry: For material requirements, see 5.7.


3.7 permanent inherent buoyancy


buoyancy provided by non-intercellular (closed cell) foam or other materials, contained within the rigid hull and cockpit, which are less dense than fresh water Note 1 to entry: For material requirement see ISO 12217-1:2013, Annex F.


3.8 permanent sealed buoyancy buoyancy provided by sealed compartments, contained within the rigid hull and cockpit, filled with air


Note 1 to entry: For requirements see ISO 12217-1:2013, Annex F reference air containers. © ISO 2014 – All rights reserved


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