Small craft - Hull construction and scantlings - Part 5: Design pressures for monohulls, design stresses, scantlings determination (ISO 12215-5:2019)

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 NOTE 1) of up to 24 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 ISO 12217.
NOTE 1 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 24 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 NOTE 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 Clause 12 and Annex J.
It is not applicable to racing craft designed only for professional racing.
NOTE 2 Local pressures and stresses for multihulls are given in ISO 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 ISO 12215-8 for
rudders, ISO 12215-9 for appendages and ISO 12215-10 for 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 6 m (see Annex 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 (1 kN/m2 = 1 kPa), stresses and elastic
modulus in N/mm2 (1 N/mm2 = 1 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.

Kleine Wasserfahrzeuge - Rumpfbauweise und Dimensionierung - Teil 5: Entwurfsdrücke für Einrumpffahrzeuge, Entwurfsspannungen, Ermittlung der Dimensionierung (ISO 12215-5:2019)

Dieser Teil von ISO 12215 gilt für die Dimensionierung von kleinen Wasserfahrzeugen mit einer Rumpflänge (LH) oder Ladelinienlänge (siehe Anmerkung) bis zu 24 m im intakten Zustand:
   Der Haupttext der Norm legt die lokalen Bemessungsdrücke und -spannungen für kleine Einrumpf-Wasserfahrzeuge fest und bietet eine Reihe von Beurteilungsverfahren.
   Ihre Anhänge enthalten verschiedene mögliche Verfahren zur Dimensionierung der Beplattung und Stützen für Einrumpf- und Mehrrumpf-Boote. Lokale Drücke und Spannungen für Mehrrumpf-Wasserfahrzeuge werden in ISO 12215 7 festgelegt.
Sie gilt für aus den folgenden Materialien gebaute kleine Wasserfahrzeuge
   glasfaserverstärkte Kunststoffe, einwandig oder in Sandwich-Bauweise;
   Aluminium- oder Stahllegierungen;
   Leim- oder Sperrholz (einwandig oder in Sandwich-Bauweise), außer traditioneller Holzbauweise;
   unverstärkte Kunststoffe mit einer Länge von weniger als 6 m, unter Anwendung von Anhang D.
Die Norm gilt für die folgenden Arten von kleinen Wasserfahrzeugen:
   Sportboote einschließlich Charter-Sportboote;
   andere kleine Wasserfahrzeuge für die gewerbliche Nutzung (Arbeitsboote) unter Anwendung des Abschnitts 12 und des Anhangs J.
Die Norm ist nicht als auf rein für professionelle Rennen Rennboote ausgelegte Norm geplant.
Die Beurteilung umfasst alle Teile des Wasserfahrzeugs, die bei der Beurteilung der Stabilität, des Freibords und des Auftriebs in Übereinstimmung mit ISO 12217 als wasserdicht oder witterungsbeständig angenommen werden.
Die Dimensionierung von Fenstern, Bullaugen, Seeschlagblenden, Klappen und Türen, die in ISO 12216 behandelt wird, ist ausgeschlossen. Die Tragwerke dieser Elemente müssen jedoch in Übereinstimmung mit diesem Teil von ISO 12215 sein.
Für die kompletten Dimensionierungen des Wasserfahrzeugs muss dieser Teil der ISO 12215 gegebenenfalls in Verbindung mit Teil 8 für die Ruder und Teil 9 für die Anhänge und Teil 10 für die Lasten und Anbauteile der Takelage genutzt werden.
In diesem Dokument, und sofern nicht anders festgelegt, sind die Abmessungen in (m), Bereiche in (m2), Massen in kg, Kräfte in (N), Momente in (Nm), Drücke in kN/m2 (1 kN/m2 = 1 kPa), Spannungen und Elastizitätsmodule in N/mm2 (1 N/mm2 = 1 Mpa) angegeben. Max (a; b; c) bedeutet, dass der erforderliche Wert der Höchstwert von a, b und c ist und min (d; e; f) steht für den Mindestwert von d, e und f.
ANMERKUNG   Die Länge der Ladelinie ist in der OMI „International Load Lines Convention 1966/2005“ festgelegt und kann bei Wasserfahrzeugen mit Überhang größer als LH sein. Diese Länge legt darüber hinaus bei 24 m die untere Grenze verschiedener IMO-Konventionen fest

Petits navires - Construction de coques et échantillonnage - Partie 5: Pressions de conception pour monocoques, contraintes de conception, détermination de l'échantillonnage (ISO 12215-5:2019)

Ce document définit les dimensions, les pressions de conception locales, les propriétés mécaniques et les contraintes de conception pour la détermination de l'échantillonnage des petits navires monocoques d'une longueur de coque (LH) ou d'une longueur de ligne de charge (voir la NOTE 1) jusqu'à 24 m. Il prend en compte toutes les parties du bateau considérées étanches à l'eau ou aux intempéries lors de l'évaluation de la stabilité, du franc-bord et de la flottabilité conformément à l'ISO 12217.
NOTE 1 La longueur de la ligne de charge ou «longueur de référence» est définie dans la «Convention Internationale sur les lignes de charge 1966/2005» de l'OMI. Elle peut être supérieure à LH pour les bateaux comportant des élancements. Cette longueur établit également à 24 m la limite inférieure de plusieurs conventions de l'OMI.
Le corps principal de ce document détermine les pressions locales et les contraintes de conception pour les monocoques et détaille les méthodes d'échantillonnage possibles dérivées de ces pressions et contraintes, aussi bien pour les monocoques que pour les multicoques (voir la NOTE 2). Le processus d'évaluation nécessite, le cas échéant, l'application d'Annexes.
Ce document est applicable pour les petits navires à l'état intact des deux types suivants:
— les bateaux de plaisance, y compris les bateaux de location avec équipage professionnel («Charter»);
— les petits navires à usage commercial et bateaux de travail, voir l'Article 12 et l'Annexe J.
Il n'est pas applicable aux bateaux de course conçus uniquement pour les courses professionnelles.
NOTE 2 Les pressions et contraintes locales pour les multicoques sont données dans l'ISO 12215‑7.
Ce document est applicable aux structures supportant les fenêtres, hublots, panneaux, tapes et portes.
Pour l'échantillonnage complet du bateau, le présent document est prévu pour être utilisé avec l'ISO 12215‑8 pour les gouvernails, l'ISO 12215‑9 pour les appendices et l'ISO 12215‑10 pour les efforts du gréement et les points d'ancrage du gréement.
Ce document couvre les petits navires construits dans les matériaux suivants:
— plastiques renforcés en construction monolithique ou sandwich;
— les alliages d'aluminium ou d'acier;
— le bois moulé ou le contreplaqué (monolithique ou sandwich), en excluant la construction traditionnelle en bois;
— les plastiques non renforcés pour les bateaux de moins de 6 m, (voir l'Annexe D).
Dans tout le présent document et sauf spécification contraire, les dimensions sont en (m), le surfaces en (m2), les masses en (kg), les forces en (N), les moments en (Nm), les pressions en kN/m2 (1 kN/m2 = 1 kPa), les contraintes et modules d'élasticité en N/mm2 (1 N/mm2 = 1 Mpa). L'expression Max (a; b; c) signifie que la valeur maximale requise est le maximum de a, b, et c, et que Min (d; e; f) signifie le minimum de d, e, et f.

Mala plovila - Konstrukcija trupa in zahtevane lastnosti - 5. del: Načrtovani tlaki za enojne ladijske trupe, načrtovane napetosti in ugotavljanje lastnosti (ISO 12215-5:2019)

Ta dokument določa dimenzije, načrtovane lokalne tlake, mehanske lastnosti in načrtovane napetosti za ugotavljanje lastnosti enojnih ladijskih trupov malih plovil z dolžino trupa (LH) ali dolžino tovorne črte (glej OPOMBO 1) do 24 m. Upošteva vse dele plovila, ki veljajo za vodoodporna ali odporna na vremenske pojave, ko se ocenjujejo stabilnost, plovnost in vzgon v skladu s standardom ISO 12217.
OPOMBA 1: Dolžina tovorne črte je definirana v »Mednarodni konvenciji o tovornih črtah 1966/2005« (IMO) in je lahko večja od LH za plovila s previsnim delom. Ta dolžina je pri 24 m tudi spodnja mejna vrednost več konvencij IMO.
Osnovno jedro tega dokumenta določa načrtovane lokalne tlake in napetosti za enojne ladijske trupe in podrobno opredeli možne metode ugotavljanja lastnosti, ki so izpeljane iz teh tlakov in napetosti, tako za enojne ladijske trupe kot za plovila z več trupi (glej OPOMBO 2). Ocenjevalni postopek zahteva, da se po potrebi uporabijo dodatki.
Ta dokument se uporablja pri malih plovilih v brezhibnem stanju naslednjih tipov:
– plovila za rekreacijo, vključno z rekreacijskimi čarterskimi plovili;
– mala komercialna plovila in delovna plovila, glej točko 12 in dodatek J.
Ne uporablja se za dirkalna plovila, zasnovana izključno za profesionalno dirkanje.
OPOMBA 2: Lokalni tlaki in napetosti za plovila z več trupi so podani v standardu ISO 12215-7.
Ta dokument se uporablja za strukture, ki podpirajo okna, naoknice, pokrove
in vrata.
Za vse zahtevane lastnosti plovila naj se ta dokument uporablja s standardom ISO 12215-8 za
krmila, ISO 12215-9 za dodatke in ISO 12215-10 za bremena in priključke.
Ta dokument zajema mala plovila, ki so zgrajena iz naslednjih materialov:
– vlakna ojačanih polimernih materialov, bodisi enoplaščni bodisi v sendvič konstrukciji;
– zlitine iz aluminija ali jekla;
– zlepljen les ali vezane plošče (enoplaščne ali sendvič), kar ne vključuje tradicionalnih lesenih konstrukcij;
– neojačani polimerni materiali za plovila z dolžino trupa do 6 m (glej dodatek D).
V tem dokumentu, razen če ni drugače določeno, so mere v (m), površine v (m2), mase v (kg), sile v (N), navori v (Nm), tlaki v kN/m2 (1 kN/m2 = 1 kPa), napetosti in elastični moduli v N/mm2 (1 N/mm2 = 1 MPa). Maks(a;b;c) pomeni, da je zahtevana vrednost največja od vrednosti a, b in c; min(d;e;f) pomeni, da je zahtevana vrednost najmanjša od vrednosti d, e in f.

General Information

Status
Published
Public Enquiry End Date
26-Oct-2017
Publication Date
04-Jul-2019
Technical Committee
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
20-Jun-2019
Due Date
25-Aug-2019
Completion Date
05-Jul-2019

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SLOVENSKI STANDARD
SIST EN ISO 12215-5:2019
01-september-2019
Nadomešča:
SIST EN ISO 12215-5:2018

Mala plovila - Konstrukcija trupa in zahtevane lastnosti - 5. del: Načrtovani tlaki za

enojne ladijske trupe, načrtovane napetosti in ugotavljanje lastnosti (ISO 12215-

5:2019)

Small craft - Hull construction and scantlings - Part 5: Design pressures for monohulls,

design stresses, scantlings determination (ISO 12215-5:2019)

Kleine Wasserfahrzeuge - Rumpfbauweise und Dimensionierung - Teil 5: Entwurfsdrücke

für Einrumpffahrzeuge, Entwurfsspannungen, Ermittlung der Dimensionierung (ISO
12215-5:2019)

Petits navires - Construction de coques et échantillonnage - Partie 5: Pressions de

conception pour monocoques, contraintes de conception, détermination de
l'échantillonnage (ISO 12215-5:2019)
Ta slovenski standard je istoveten z: EN ISO 12215-5:2019
ICS:
47.020.10 Ladijski trupi in njihovi Hulls and their structure
konstrukcijski elementi elements
47.080 Čolni Small craft
SIST EN ISO 12215-5:2019 en,fr,de

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN ISO 12215-5:2019
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SIST EN ISO 12215-5:2019
EN ISO 12215-5
EUROPEAN STANDARD
NORME EUROPÉENNE
June 2019
EUROPÄISCHE NORM
ICS 47.080 Supersedes EN ISO 12215-5:2018
English Version
Small craft - Hull construction and scantlings - Part 5:
Design pressures for monohulls, design stresses, scantlings
determination (ISO 12215-5:2019)

Petits navires - Construction de coques et Kleine Wasserfahrzeuge - Rumpfbauweise und

échantillonnage - Partie 5: Pressions de conception Dimensionierung - Teil 5: Entwurfsdrücke für

pour monocoques, contraintes de conception, Einrumpffahrzeuge, Entwurfsspannungen, Ermittlung

détermination de l'échantillonnage (ISO 12215- der Dimensionierung (ISO 12215-5:2019)

5:2019)
This European Standard was approved by CEN on 16 February 2019.

CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this

European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references

concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN

member.

This European Standard exists in three official versions (English, French, German). A version in any other language made by

translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management

Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,

Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, North

Macedonia, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United

Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels

© 2019 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 12215-5:2019 E

worldwide for CEN national Members.
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SIST EN ISO 12215-5:2019
EN ISO 12215-5:2019 (E)
Contents Page

European foreword ....................................................................................................................................................... 3

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SIST EN ISO 12215-5:2019
EN ISO 12215-5:2019 (E)
European foreword

This document (EN ISO 12215-5:2019) has been prepared by Technical Committee ISO/TC 188 "Small

craft" in collaboration with CCMC.

This European Standard shall be given the status of a national standard, either by publication of an

identical text or by endorsement, at the latest by December 2019, and conflicting national standards

shall be withdrawn at the latest by June 2021.

Attention is drawn to the possibility that some of the elements of this document may be the subject of

patent rights. CEN shall not be held responsible for identifying any or all such patent rights.

This document supersedes EN ISO 12215-5:2018.

According to the CEN-CENELEC Internal Regulations, the national standards organizations of the

following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria,

Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia,

France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta,

Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,

Turkey and the United Kingdom.
Endorsement notice

The text of ISO 12215-5:2019 has been approved by CEN as EN ISO 12215-5:2019 without any

modification.
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SIST EN ISO 12215-5:2019
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SIST EN ISO 12215-5:2019
INTERNATIONAL ISO
STANDARD 12215-5
Second edition
2019-05
Small craft — Hull construction and
scantlings —
Part 5:
Design pressures for monohulls,
design stresses, scantlings
determination
Petits navires — Construction de coques et échantillonnage —
Partie 5: Pressions de conception pour monocoques, contraintes de
conception, détermination de l'échantillonnage
Reference number
ISO 12215-5:2019(E)
ISO 2019
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SIST EN ISO 12215-5:2019
ISO 12215-5:2019(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2019

All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may

be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting

on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address

below or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Fax: +41 22 749 09 47
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii © ISO 2019 – All rights reserved
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SIST EN ISO 12215-5:2019
ISO 12215-5:2019(E)
Contents Page

Foreword ..........................................................................................................................................................................................................................................v

Introduction ..............................................................................................................................................................................................................................vii

1 Scope ................................................................................................................................................................................................................................. 1

2 Normative references ...................................................................................................................................................................................... 2

3 Terms and definitions ..................................................................................................................................................................................... 2

4 Symbols .......................................................................................................................................................................................................................... 4

5 General ............................................................................................................................................................................................................................ 6

5.1 Materials ....................................................................................................................................................................................................... 6

5.2 Overall procedure for scantlings determination........................................................................................................ 6

6 Main dimensions, data and areas ........................................................................................................................................................ 7

6.1 Dimensions and data ......................................................................................................................................................................... 7

6.2 Areas ................................................................................................................................................................................................................ 7

6.2.1 General...................................................................................................................................................................................... 7

7 Dimensions of panels and stiffeners ................................................................................................................................................ 9

7.1 General ........................................................................................................................................................................................................... 9

7.2 Rectangular grid of panels and stiffeners .....................................................................................................................10

7.3 Non-rectangular panels ................................................................................................................................................................12

7.3.1 Trapezoidal or triangular panels ....................................................................................................................12

7.3.2 Other shapes .....................................................................................................................................................................13

7.4 Pressure on a panel or a stiffener ........................................................................................................................................14

8 Pressure adjusting factors .......................................................................................................................................................................15

8.1 General ........................................................................................................................................................................................................15

8.2 Design category factor k .......................................................................................................................................................15

8.3 Dynamic load factor k ..........................................................................................................................................................15

DYN

8.4 Longitudinal pressure distribution factor k ............................................................................................................16

8.5 Area pressure reduction factor k ..................................................................................................................................17

8.6 Superstructures and deckhouse pressure reduction factor k ............................................................18

SUP

8.7 Pressure correcting factor k for slamming of light and stable sailing craft ..............................18

SLS

9 Design pressures ...............................................................................................................................................................................................19

9.1 Design pressure for motor craft ............................................................................................................................................19

9.2 Design pressure for sailing craft ...........................................................................................................................................21

9.3 Watertight bulkheads and integral tank boundaries design pressure ................................................22

9.3.1 General...................................................................................................................................................................................22

9.3.2 Integral tanks wash plates ....................................................................................................................................23

9.3.3 Collision bulkheads ....................................................................................................................................................23

9.3.4 Non-watertight or partial bulkheads ..........................................................................................................24

9.3.5 Centreboards of lifting keel wells ...................................................................................................................24

9.3.6 Transmission of pillar loads ................................................................................................................................24

9.3.7 Loads from outboard engines ............................................................................................................................24

10 Mechanical properties and design stresses ..........................................................................................................................24

10.1 Boat building quality factor k .............................................................................................................................................

BB 24

10.2 Assessment method factor k ............................................................................................................................................25

10.3 Design stresses according to material and calculation method ................................................................25

11 Methods for structural analysis and scantlings determination .......................................................................27

11.1 The six available methods ..........................................................................................................................................................27

11.2 Method 1: "Simplified" method .............................................................................................................................................27

11.3 Method 2: "Enhanced" method (ply by ply analysis) ..........................................................................................28

11.4 Method 3: "Developed" method for any laminate, including non-balanced laminates .........28

11.5 Method 4: "Direct test method" .............................................................................................................................................28

11.6 Method 5: "FEM" Finite Element Method .....................................................................................................................28

© ISO 2019 – All rights reserved iii
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SIST EN ISO 12215-5:2019
ISO 12215-5:2019(E)

11.6.1 General considerations ............................................................................................................................................28

11.6.2 General guidance for assessment by 3-D numerical procedures ........................................29

11.6.3 Boundary assumptions and load application ......................................................................................29

11.6.4 Model idealisation .......................................................................................................................................................29

11.7 Method 6: Alternative test: Drop test ...............................................................................................................................29

11.8 "Good practice" minimal thickness ....................................................................................................................................30

12 Craft for professional use: Commercial craft and workboats .............................................................................30

13 Owner's manual .................................................................................................................................................................................................30

13.1 General ........................................................................................................................................................................................................30

13.2 Normal mode of operation ........................................................................................................................................................30

13.3 Information to take care of sandwich plating ...........................................................................................................30

13.4 Information required by Annex J for commercial craft and workboats..............................................30

14 Application form ................................................................................................................................................................................................30

Annex A (normative) Application of methods of analysis 1 to 3 of Table 18 ...........................................................31

Annex B (normative) Mechanical properties and design stress of metals ................................................................58

Annex C (normative) FRP laminates properties and calculations ......................................................................................61

Annex D (normative) Drop test for craft <6 m .........................................................................................................................................73

Annex E (normative) Sandwich calculations .............................................................................................................................................76

Annex F (normative) Wood/plywood laminate properties and calculations .........................................................80

Annex G (normative) Geometric properties of stiffeners ............................................................................................................89

Annex H (normative) Laminate stack analysis for plating and stiffeners ..............................................................101

Annex I (informative) "Good practice " values for minimum thickness or dry fibre mass ...................116

Annex J (normative) Commercial craft and workboats — Additional requirements .................................118

Annex K (informative) Loads induced by outboard engines.................................................................................................121

Annex L (informative) Application form of ISO 12215-5 ..........................................................................................................123

Bibliography .........................................................................................................................................................................................................................125

iv © ISO 2019 – All rights reserved
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SIST EN ISO 12215-5:2019
ISO 12215-5:2019(E)
Foreword

ISO (the International Organization for Standardization) is a worldwide federation of national standards

bodies (ISO member bodies). The work of preparing International Standards is normally carried out

through ISO technical committees. Each member body interested in a subject for which a technical

committee has been established has the right to be represented on that committee. International

organizations, governmental and non-governmental, in liaison with ISO, also take part in the work.

ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of

electrotechnical standardization.

The procedures used to develop this document and those intended for its further maintenance are

described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the

different types of ISO documents should be noted. This document was drafted in accordance with the

editorial rules of the ISO/IEC Directives, Part 2 (see www .iso .org/directives).

Attention is drawn to the possibility that some of the elements of this document may be the subject of

patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of

any patent rights identified during the development of the document will be in the Introduction and/or

on the ISO list of patent declarations received (see www .iso .org/patents).

Any trade name used in this document is information given for the convenience of users and does not

constitute an endorsement.

For an explanation on the meaning of ISO specific terms and expressions related to conformity

assessment, as well as information about ISO's adherence to the WTO principles in the Technical

Barriers to Trade (TBT) see the following URL: Foreword - Supplementary information

The committee responsible for this document is ISO/TC 188, Small craft.

This second edition cancels and replaces the first edition (ISO 12215-5:2008, including its amendment

ISO 12215-5:2008/Amd 1:2014), which has been technically revised.

One of the main reasons to achieve this revision, after a decade implementing the first edition, was

to allow other scantlings calculation methods than those given in the 2008 edition, noting the huge

development of finite element analysis methods and software, and the trend already applied in ISO

12215-9 (keels and appendages) and ISO 12215-7 (multihulls).

Therefore, in this new edition, like in many other scantlings standards, the design pressure loads,

and the design stresses are given in the main body of the standard and, where needed, the scantlings

calculation methods are detailed in Annexes.
The main changes compared to the previous edition are as follows:

— clarification of the scope and of many definitions, dimensions, and assessment;

— definition of a theoretical hull/deck limit height Z in Table 3;
SDT
— renaming of n into k in Table 7;
GC DYN
— lowering of the values of k in the aft part of the craft in Table 8;

— deletion of k min, to better consider large panels, mainly sandwiches, in Table 9;

— improvement of the values of k in Table 10;
SUP

— modification of design pressures for motor and sailing craft in Tables 12 & 13;

— modification of design stresses introducing k and k factors in Tables 15 to 17;

BB AM

— incorporation of requirements for work boats in Table 2, Clause 12 and Annex J;

— possibility to use a wider range of assessment methods detailed in Table 18;
© ISO 2019 – All rights reserved v
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SIST EN ISO 12215-5:2019
ISO 12215-5:2019(E)
— move of the previous assessment method (now called "simplified") in Annex A;

— improvements/clarification of the simplified method (panel assessment, hard chined sections,

frameless sections, simple and double curvature, attached plating, requirements for core, etc.);

— development of Annex C for the determination of mechanical properties of composites;

— reminder in A.14 of the requirements of ISO 12215-9 on reinforcement of the hull in way of ballast

keel attachment;

— new Annex I only recommending minimum thickness for single skin and sandwich that are no longer

mandatory;

— new Annex J defining different types of commercial craft and workboats and their requirements;

— new Annex K defining loads induced by outboard engines;

— new Annex L proposing an application sheet of this document to explain how it has been used;

— for clarity, this edition generally uses tables to present formulas and requirements.

A list of all parts in the ISO 12215 series can be found in the ISO website.

NOTE The mechanical properties of ISO 12215-1 to -3 are largely superseded by the ones of this document.

Any feedback or questions on this document should be directed to the user’s national standards body. A

complete listing of these bodies can be found at www .iso .org/members .html.
vi © ISO 2019 – All rights reserved
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SIST EN ISO 12215-5:2019
ISO 12215-5:2019(E)
Introduction

The reason underlying the preparation of this document is that standards and recommended practices

for loads on the hull and the dimensioning of small craft differ considerably, thus limiting the general

worldwide acceptability of craft scantlings. This document has been set towards the minimal

requirements of the current practice.

The implementation of this document allows to achieve an overall structural strength that ensures the

watertight and weathertight integrity of the craft. This document is intended to be a tool to determine

the scantlings of a craft as per minimal requirements. It is not intended to be a structural design

procedure.

It is also emphasized that this document should only be used to check the main structural features

of a craft but should not be used as a scantlings guide. Users of this document should have practical

and theoretical experience in strength of materials and engineering, even if calculation software

are available. Many details can have a significant influence on the final stresses and strength of the

structure, ISO 12215-6 shows "established practice".

The scantlings requirements aim at providing adequate local strength. Serviceability issues such as

deflection under normal operating loads, global strength and its connected shell and deck stability

are not addressed in this document. The related criteria may need to be addressed by additional

considerations, as deemed necessary by the users of this document.

The mechanical property data supplied as default values make no explicit allowance for deterioration

in service nor provide any guarantee that these values can be obtained for any particular craft.

Considering the future development in technology and the boat types and small craft outside the scope

of this document, other methods than those described in this document exist, supported by appropriate

technology, that can be used provided that they lead to equivalent results.

The dimensioning according to this document is regarded as reflecting current practice, provided the

craft is correctly handled in the sense of good seamanship and operated at a speed appropriate to the

prevailing sea state.
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SIST EN ISO 12215-5:2019
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SIST EN ISO 12215-5:2019
INTERNATIONAL STANDARD ISO 12215-5:2019(E)
Small craft — Hull construction and scantlings —
Part 5:
Design pressures for monohulls, design stresses, scantlings
determination
1 Scope

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 (L ) or a load line

length (see NOTE 1) of up to 24 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 ISO 12217.

NOTE 1 The load line length is defined in the IMO "International Load Lines Convention 1966/2005", it

can be larger than L for craft with overhangs. This length also sets up at 24 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 NOTE 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 Clause 12 and Annex J.
It is not applicable to racing craft designed only for professional racing.
NOTE 2 Local pressures and stresses for multihulls are given in ISO 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 ISO 12215-8 for

rudders, ISO 12215-9 for appendages and ISO 12215-10 for 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 6 m (see Annex D).

Throughout this document, unless otherwise specified, dimensions are in (m), areas in (m ), masses

2 2
...

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