BS EN ISO 6185-3:2018 ISO 6185‑3:2014


7.4 Buoyancy requirements


7.4.1 Total buoyant volume The total buoyant volume (V) in m3 comprises: a) For inflatable boats: — all chambers which form the inflatable hull; and — any other inflatable chamber which is permanently fixed to it. (3.3). b) For rigid inflatable boats: — the buoyancy of tubes (3.5 or 3.6); and — permanent inherent buoyancy (3.7); and — permanent sealed buoyancy (3.8); and — inherent buoyancy of the rigid parts of the boat (For calculation see Annex D of ISO 12217-3:2013). Inherent buoyancy (v) of the rigid parts of the boat can be calculated as:


v m= ρ


where v


m ρ


is the volume of an element, expressed in m3; is the mass of that element, expressed in kg;


is the density of that element, expressed in kg/m3, as given in Table 4. Table 4— Material densities


Material


Aluminium alloys GRP laminate


Flotation foam materials Structural foam materials Balsa core materials Teak


Miscellaneous equipment Diesel engines Petrol engines


Outboard engines plywood


The total buoyant volume in m3 (V) shall be as follows: V kmLDC


> × 1 000


Where k is: — 1,33 for boats assessed to design category B;


© ISO 2014 – All rights reserved 15


Density kg/m3


2 700 1 500 40 80


150 640


2 000 5 000 4 000 3 000 600


Distributed through RYA Online Standards Access under Licence No: 2020ET0001 © BSI


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