BS EN ISO 12215-5:2019 - Small craft. Hull construction and scantlings. Design pressures for monohulls, design stresses, scantlings determination

BS EN ISO 12215-5:2019

Small craft. Hull construction and scantlings. Design pressures for monohulls, design stresses, scantlings determination

Status : Current   Published : July 2019
Conformity to regulation : Designated



This document defines the dimensions, design local pressures, mechanical properties and design stresses for the scantlings determination of monohull small craft with a hull length (LH) or a load line length (see NOTEá 1) of up to 24á m. It considers all parts of the craft that are assumed to be watertight or weathertight when assessing stability, freeboard and buoyancy in accordance with ISOá 12217.


The load line length is defined in the IMO "International Load Lines Convention 1966/2005", it can be larger than LH for craft with overhangs. This length also sets up at 24á m the lower limit of several IMO conventions.

The main core of this document determines the local design pressures and stresses for monohulls and details the possible scantlings methods derived from these pressures and stresses, both for monohulls and multihulls (see NOTEá 2). The assessment process requires, where relevant, the application of Annexes.

This document is applicable to small craft, in intact condition, of the two following types:

  • recreational craft, including recreational charter vessels;

  • small commercial craft and workboats, see Clauseá 12 and Annexá J.

It is not applicable to racing craft designed only for professional racing.


Local pressures and stresses for multihulls are given in ISOá  12215-7 .

This document is applicable to the structures supporting windows, portlights, hatches, deadlights, and doors.

For the complete scantlings of the craft, this document is intended to be used with ISOá 12215-8for rudders, ISOá 12215-9for appendages and ISOá 12215-10for rig loads and rig attachments.

This document covers small craft built from the following materials:

  • fibre-reinforced plastics, either in single skin or sandwich construction;

  • aluminium or steel alloys;

  • glued wood or plywood (single skin or sandwich), excluding traditional wood construction;

  • non-reinforced plastics for craft with a hull length less than 6á m (see Annexá D).

Throughout this document, unless otherwise specified, dimensions are in (m), areas in (m2), masses in (kg), forces in (N), moments in (N.m), pressures in kN/m2(1á kN/m2á =á 1Ãâ₠¬Å¡Ãƒâ€š ÃƒÆ’¡Ãƒâ€š kPa), stresses and elastic modulus in N/mm2(1á N/mm2á =á 1Ãâ₠¬Å¡Ãƒâ€š Mpa). Max(a;b;c) means that the required value is the maximum of a, b, and c; and min(d;e;f) means that the required value is the minimum of d, e, and f.

Standard NumberBS EN ISO 12215-5:2019
TitleSmall craft. Hull construction and scantlings. Design pressures for monohulls, design stresses, scantlings determination
Publication Date02 July 2019
Conformity to regulationDesignated
Normative References(Required to achieve compliance to this standard)ISO 12217-3:2015, ISO 12217-1:2015, ISO 12217-2:2015, ISO 12215-9:2012, ISO 8666:2016
Informative References(Provided for Information)ISO 527-1, ISO 12215-7, ISO 178, ASTM C393, ISO 527-2, ISO 12216, ISO 1922, ISO 12215-3, ISO 845, ISO 844, EN 14195-1, ISO 12215-5:2008, ISO 12215-6:2008, BS EN 408:1995, BS EN 1995-1-1:2004
ReplacesBS EN ISO 12215-5:2008+A1:2014, BS EN ISO 12215-5:2018
International RelationshipsEN ISO 12215-5:2019,ISO 12215-5:2019
Amended ByCorrigendum, October 2019
DescriptorsStress, Boats, Hulls, Shipbuilding, Strength of materials, Structural members, Loading, Structural design, Pressure, Mathematical calculations, Stiffeners, Ships bodies, Water transport engineering, Superstructures (ships), Water transport engineering components
Title in FrenchPetits navires. Construction de coques et échantillonnage Pressions de conception pour monocoques, contraintes de conception, détermination de l'échantillonnage
Title in GermanKleine Wasserfahrzeuge. Rumpfbauweise und Dimensionierung Entwurfsdrücke für Einrumpffahrzeuge, Entwurfsspannungen, Ermittlung der Dimensionierung
ISBN978 0 539 06879 5
File Size12.59 MB

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