Small craft - Hull construction and scantlings - Part 6: Structural arrangements and details (ISO 12215-6:2008)

This part of ISO 12215 concerns structural details and structural components not explicitly included in
ISO 12215-5, ISO 12215-7, ISO 12215-8 and ISO 12215-9. It applies to monohull and multihull small craft
constructed from fibre reinforced plastics (FRP), aluminium or steel alloys, wood or other suitable boat
building material, with a hull length, in accordance with ISO 8666, of up to 24 m.
This part of ISO 12215 fulfils two functions. Firstly, it supports ISO 12215-5 by providing further explanations
and calculation procedures and formulae. Secondly, it gives a number of examples of arrangements and
structural details which illustrate principles of good practice. These principles provide a standard against which
alternative arrangements and structural details can be benchmarked, using the equivalence criteria specified
in this part of ISO 12215.
NOTE Scantlings derived from this part of ISO 12215 are primarily intended to apply to recreational craft including
recreational charter vessels and might not be suitable for performance racing craft.

Kleine Wasserfahrzeuge - Rumpfbauweise und Dimensionierung - Teil 6: Bauanordnung und Details (ISO 12215-6:2008)

Dieser Teil von ISO 12215 betrifft die Bestimmung von Baudetails und Baukomponenten, die nicht ausdrück-lich in ISO 12215-5; ISO 12215-7, ISO 12215-8 und ISO 12215-9 aufgeführt sind. Betroffen sind kleine Ein-rumpf- und Mehrrumpf-Wasserfahrzeuge, die aus glasfaserverstärkten Kunststoffen (GfK), Aluminium- oder Stahllegierungen, Holz oder anderen geeigneten Bootsbauwerkstoffen gebaut sind, mit einer Rumpflänge bis 24 m nach ISO 8666.
Dieser Teil von ISO 12215 erfüllt zwei Funktionen. Erstens unterstützt er ISO 12215-5, indem weitere Erklä-rungen und Kalkulationsschemata und Gleichungen bereitgestellt werden. Zweitens stellt er eine Reihe von Beispielen für Anordnungen und Baudetails zur Verfügung, die Grundlagen guter fachlicher Praxis darstellen. Diese Grundlagen stellen einen Richtwert dar, anhand dessen alternative Anordnungen und Bauteile bewertet werden können, indem die Gleichwertigkeitskriterien, die in diesem Teil der ISO 12215 beschrieben sind, benutzt werden.
ANMERKUNG Dimensionierungen, die sich aus diesem Teil von ISO 12215 ableiten, sind in erster Linie für Sport-boote einschließlich gecharterter Sportboote gedacht und sind möglicherweise nicht für Leistungsrennboote geeignet.

Petits navires - Construction de coques et échantillonnage - Partie 6: Dispositions structurelles et détails de construction (ISO 12215-6:2008)

Mala plovila - Konstrukcija trupa in zahtevane lastnosti - 6. del: Struktura in podrobnosti (ISO 12215-6:2008)

Ta del standarda ISO 12215 obravnava podrobnosti in sestavne dele konstrukcij, ki v standardih ISO 12215-5, ISO 12215-7, ISO 12215-8 ter ISO 12215-9 niso izrecno zajeti. Uporablja se za mala plovila z enim ali več trupi, izdelana iz ojačenih polimernih materialov (FRP), aluminijevih ali jeklenih zlitin, lesa ali drugega ustreznega materiala za izdelavo plovil z dolžino trupa do 24 m v skladu s standardom ISO 8666.
Ta del standarda ISO 12215 izpolnjuje dve funkciji. Prva funkcija je, da podpira ISO 12215-5 s podajanjem dodatnih pojasnil ter računskih postopkov in formul. Druga funkcije je, da podaja številne primere razporeditvenih in konstrukcijskih podrobnosti, ki ponazarjajo načela dobre prakse. Ta načela ponujajo standard, s katerim se lahko na podlagi meril enakovrednosti, določenih v tem delu standarda ISO 12215, primerjajo drugačne razporeditvene in konstrukcijske podrobnosti.
OPOMBA: Zahtevane lastnosti iz tega dela standarda ISO 12215 so namenjene predvsem za plovila za rekreacijo, vključno z rekreacijskimi čarterskimi plovili in morda niso primerne za zmogljiva dirkalna plovila.

General Information

Status
Published
Public Enquiry End Date
14-Mar-2018
Publication Date
14-Oct-2018
Technical Committee
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
11-Oct-2018
Due Date
16-Dec-2018
Completion Date
15-Oct-2018

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SLOVENSKI STANDARD
SIST EN ISO 12215-6:2018
01-december-2018
1DGRPHãþD
SIST EN ISO 12215-6:2008
Mala plovila - Konstrukcija trupa in zahtevane lastnosti - 6. del: Struktura in
podrobnosti (ISO 12215-6:2008)

Small craft - Hull construction and scantlings - Part 6: Structural arrangements and

details (ISO 12215-6:2008)

Kleine Wasserfahrzeuge - Rumpfbauweise und Dimensionierung - Teil 6: Bauanordnung

und Details (ISO 12215-6:2008)

Petits navires - Construction de coques et échantillonnage - Partie 6: Dispositions

structurelles et détails de construction (ISO 12215-6:2008)
Ta slovenski standard je istoveten z: EN ISO 12215-6:2018
ICS:
47.020.10 Ladijski trupi in njihovi Hulls and their structure
konstrukcijski elementi elements
47.080 ýROQL Small craft
SIST EN ISO 12215-6:2018 en,fr,de

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

---------------------- Page: 1 ----------------------
SIST EN ISO 12215-6:2018
---------------------- Page: 2 ----------------------
SIST EN ISO 12215-6:2018
EN ISO 12215-6
EUROPEAN STANDARD
NORME EUROPÉENNE
October 2018
EUROPÄISCHE NORM
ICS 47.080 Supersedes EN ISO 12215-6:2008
English Version
Small craft - Hull construction and scantlings - Part 6:
Structural arrangements and details (ISO 12215-6:2008)

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

échantillonnage - Partie 6: Dispositions structurelles et Dimensionierung - Teil 6: Bauanordnung und Details

détails de construction (ISO 12215-6:2008) (ISO 12215-6:2008)
This European Standard was approved by CEN on 16 April 2018.

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, 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 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

© 2018 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 12215-6:2018 E

worldwide for CEN national Members.
---------------------- Page: 3 ----------------------
SIST EN ISO 12215-6:2018
EN ISO 12215-6:2018 (E)
Contents Page

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

Annex ZA (informative) Relationship between this European Standard and the Essential

Requirements of Directive 2013/53/EU aimed to be covered ....................................................... 4

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SIST EN ISO 12215-6:2018
EN ISO 12215-6:2018 (E)
European foreword

The text of ISO 12215-6:2008 has been prepared by Technical Committee ISO/TC 188 “Small craft” of the

International Organization for Standardization (ISO) and has been taken over as EN ISO 12215-6:2018.

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 April 2019, and conflicting national standards shall be

withdrawn at the latest by April 2019.

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 12215-6:2008.

This document has been prepared under a mandate given to CEN by the European Commission and the

European Free Trade Association, and supports essential requirements of EU Directive 2013/53/EU.

For relationship with EU Directive 2013/53/EU, see informative Annex ZA, which is an integral part of

this document.

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 12215-6:2008 has been approved by CEN as EN ISO 12215-6:2018 without any

modification.
---------------------- Page: 5 ----------------------
SIST EN ISO 12215-6:2018
EN ISO 12215-6:2018 (E)
Annex ZA
(informative)
Relationship between this European Standard and the Essential
Requirements of Directive 2013/53/EU aimed to be covered

This European standard has been prepared under a Commission’s standardization request M/542

C(2015) 8736 final to provide one voluntary means of conforming to Essential Requirements of Directive

2013/53/EU.

Once this standard is cited in the Official Journal of the European Union under that Directive, compliance

with the normative clauses of this standard given in Table ZA.1 confers, within the limits of the scope of

this standard, a presumption of conformity with the corresponding Essential Requirements of that

Directive and associated EFTA regulations.

Table ZA.1 — Correspondence between this European Standard and Annex I of Directive

2013/53/EU
Corresponding Clauses/sub- Comments
annexes/paragraphs of clauses of this
standard
Directive 2013/53/EU

Annex I, Part A, 3.1 - All clauses This part ISO 12215 standard series supports EN

Structure ISO 12215-5 and deals with specific structural
details and other structural components for
monohull and multihull craft constructed from fibre
reinforced plastics, aluminium or steel alloys, wood
or similar suitable materials that are not explicitly
included in Parts 5; 7; 8 and 9.

WARNING 1 — Presumption of conformity stays valid only as long as a reference to this European

Standard is maintained in the list published in the Official Journal of the European Union. Users of this

standard should consult frequently the latest list published in the Official Journal of the European Union.

WARNING 2 — Other Union legislation may be applicable to the product(s) falling within the scope of

this standard.
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SIST EN ISO 12215-6:2018
INTERNATIONAL ISO
STANDARD 12215-6
First edition
2008-04-01
Small craft — Hull construction and
scantlings —
Part 6:
Structural arrangements and details
Petits navires — Construction de coques et échantillonnages —
Partie 6: Dispositions et détails de construction
Reference number
ISO 12215-6:2008(E)
ISO 2008
---------------------- Page: 7 ----------------------
SIST EN ISO 12215-6:2018
ISO 12215-6:2008(E)
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Published in Switzerland
ii © ISO 2008 – All rights reserved
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SIST EN ISO 12215-6:2018
ISO 12215-6:2008(E)
Contents Page

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

Introduction ....................................................................................................................................................... vi

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

2 Normative references ............................................................................................................................1

3 Terms and definitions ...........................................................................................................................1

4 Symbols ..................................................................................................................................................3

5 General....................................................................................................................................................4

6 Structural arrangement .........................................................................................................................4

6.1 Stiffening ................................................................................................................................................4

6.2 Hull girder strength................................................................................................................................7

6.3 Load transfer..........................................................................................................................................7

6.4 Determination of stiffener spans........................................................................................................11

6.5 Window mullions .................................................................................................................................13

6.6 Sailboat mast support .........................................................................................................................14

7 Specific structural details for FRP construction ..............................................................................14

7.1 Local reinforcement ............................................................................................................................14

7.2 Bonding ................................................................................................................................................16

7.3 Major joints...........................................................................................................................................21

7.4 Laminate transition..............................................................................................................................25

7.5 Sandwich construction .......................................................................................................................25

7.6 Attachment of fittings..........................................................................................................................25

7.7 Engine seatings and girders...............................................................................................................25

7.8 Hull drainage ........................................................................................................................................28

8 Specific structural details for metal construction............................................................................28

8.1 Design details.......................................................................................................................................28

8.2 End connections..................................................................................................................................28

8.3 Increased hull plating..........................................................................................................................28

8.4 Protective keel......................................................................................................................................28

8.5 Hull drainage ........................................................................................................................................29

8.6 Machinery spaces................................................................................................................................29

8.7 Good practice welding standards......................................................................................................29

8.8 Good practice for riveting or adhesive bonding ..............................................................................29

9 Good practice on laminated wood.....................................................................................................30

9.1 Edge sealing.........................................................................................................................................30

9.2 Plywood orientation.............................................................................................................................30

9.3 Local scantlings...................................................................................................................................30

9.4 Alternative criteria ...............................................................................................................................31

10 Consideration of other loads..............................................................................................................31

11 Other structural components .............................................................................................................31

11.1 General..................................................................................................................................................31

11.2 Rudder structure and connection......................................................................................................31

11.3 Keel attachment ...................................................................................................................................32

11.4 Introduction and distribution of rigging loads .................................................................................32

11.5 Other structural components not considered in other parts ..........................................................32

Annex A (normative) Structural arrangements for category C and D boats...............................................33

© ISO 2008 – All rights reserved iii
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SIST EN ISO 12215-6:2018
ISO 12215-6:2008(E)

Annex B (informative) Determination of shear stresses within a stiffener with glued or

riveted joints........................................................................................................................................ 35

Annex C (informative) Good practice welding procedure ............................................................................ 41

Annex D (informative) Longitudinal strength analysis ................................................................................. 47

Bibliography ..................................................................................................................................................... 52

iv © ISO 2008 – All rights reserved
---------------------- Page: 10 ----------------------
SIST EN ISO 12215-6:2018
ISO 12215-6:2008(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.

International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.

The main task of technical committees is to prepare International Standards. Draft International Standards

adopted by the technical committees are circulated to the member bodies for voting. Publication as an

International Standard requires approval by at least 75 % of the member bodies casting a vote.

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.

ISO 12215-6 was prepared by Technical Committee ISO/TC 188, Small craft.

ISO 12215 consists of the following parts, under the general title Small craft — Hull construction and

scantlings:

⎯ Part 1: Materials: Thermosetting resins, glass-fibre reinforcement, reference laminate

⎯ Part 2: Materials: Core materials for sandwich construction, embedded materials

⎯ Part 3: Materials: Steel, aluminium alloys, wood, other materials
⎯ Part 4: Workshop and manufacturing

⎯ Part 5: Design pressures for monohulls, design stresses, scantlings determination

⎯ Part 6: Structural arrangements and details
⎯ Part 7: Scantling determination of multihulls
⎯ Part 8: Rudders
⎯ Part 9: Sailing boats — Appendages and rig attachments
© ISO 2008 – All rights reserved v
---------------------- Page: 11 ----------------------
SIST EN ISO 12215-6:2018
ISO 12215-6:2008(E)
Introduction

The underlying reason for preparing this part of ISO 12215 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 boats.

The objective of this part of ISO 12215 is to achieve an overall structural strength that ensures the watertight

and weathertight integrity of the craft.

This part of ISO 12215 is considered to have been developed with the application of current practice and

sound engineering principles.

Considering future development in technology and boat types, as well as small craft currently outside the

scope of this part of ISO 12215, and provided that methods supported by appropriate technology exist,

consideration may be given to their use so long as equivalent strength to this part of ISO 12215 is achieved.

Dimensioning in accordance with this part of ISO 12215 is regarded as reflecting current practice, provided

that the craft is correctly handled in the sense of good seamanship and that it is equipped and operated at a

speed appropriate to the prevailing sea state.
vi © ISO 2008 – All rights reserved
---------------------- Page: 12 ----------------------
SIST EN ISO 12215-6:2018
INTERNATIONAL STANDARD ISO 12215-6:2008(E)
Small craft — Hull construction and scantlings —
Part 6:
Structural arrangements and details
1 Scope

This part of ISO 12215 concerns structural details and structural components not explicitly included in

ISO 12215-5, ISO 12215-7, ISO 12215-8 and ISO 12215-9. It applies to monohull and multihull small craft

constructed from fibre reinforced plastics (FRP), aluminium or steel alloys, wood or other suitable boat

building material, with a hull length, in accordance with ISO 8666, of up to 24 m.

This part of ISO 12215 fulfils two functions. Firstly, it supports ISO 12215-5 by providing further explanations

and calculation procedures and formulae. Secondly, it gives a number of examples of arrangements and

structural details which illustrate principles of good practice. These principles provide a standard against which

alternative arrangements and structural details can be benchmarked, using the equivalence criteria specified

in this part of ISO 12215.

NOTE Scantlings derived from this part of ISO 12215 are primarily intended to apply to recreational craft including

recreational charter vessels and might not be suitable for performance racing craft.

2 Normative references

The following referenced documents are indispensable for the application of this document. For dated

references, only the edition cited applies. For undated references, the latest edition of the referenced

document (including any amendments) applies.
ISO 8666, Small craft — Principal data

ISO 12215-5:2008, Small craft — Hull construction and scantlings — Part 5: Design pressures for monohulls,

design stresses, scantlings determination

ISO 12215-7, Small craft — Hull construction and scantlings — Part 7: Scantling determination of multihulls

ISO 12215-8, Small craft — Hull construction and scantlings — Part 8: Rudders

ISO 12215-9, Small craft — Hull construction and scantlings — Part 9: Appendages and rig attachment

ISO 12216, Small craft — Windows, portlights, hatches, deadlights and doors — Strength and watertightness

requirements
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
loaded displacement mass
LDC

mass of the craft, including all appendages, when in the fully-loaded ready-for-use condition, as defined in

ISO 8666
© ISO 2008 – All rights reserved 1
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SIST EN ISO 12215-6:2018
ISO 12215-6:2008(E)
3.2
sailing craft
2/3

craft for which the primary means of propulsion is by wind power, and for which A > 0,07(m ) where

S LDC

A is the total profile area of all sails that can be set at one time when sailing closed hauled, as

defined in ISO 8666, expressed in m ;
m is the loaded displacement, as defined in ISO 8666, expressed in kg.
LDC

NOTE In this part of ISO 12215, non-sailing craft are referred to as motor craft.

3.3
grid
grillage
set of transverse stiffeners that intersect a set of longitudinal stiffeners
3.4
secondary stiffener
stiffening element that directly supports the plating

NOTE In a stiffener grillage, secondary stiffeners usually correspond to stiffeners having the lower second moment of

area, e.g. stringers, frames, partial bulkheads. The spacing of secondary stiffeners generally corresponds to the shortest

unsupported span of the attached plating. In the case of stiffeners with a substantial base width (i.e. top hat stiffeners), the

stiffener spacing will be the unsupported panel span plus this base width.
3.5
primary stiffener
stiffening element that supports the secondary stiffening element

NOTE 1 In a stiffener grillage, primary stiffeners usually correspond to stiffeners which have the higher second moment

of area, e.g. structural bulkheads, girders, web frames. The spacing of primary stiffeners generally corresponds to the

span of secondary stiffeners.

NOTE 2 Some stiffeners, such as bulkheads, deep girders or web frames, may also contribute to resisting global loads.

3.6
stringer

longitudinal stiffener, generally designated a secondary stiffener (3.4), which supports the shell plating

3.7
frame

transverse stiffener, generally designated a secondary stiffener (3.4), which supports the shell plating

3.8
beam

transverse stiffener, generally designated a secondary stiffener (3.4), which supports the deck plating

3.9
web frame

substantial transverse stiffener, generally designated a primary stiffener (3.5), which supports stringers and

less substantial girders and is usually connected with substantial deck beams

NOTE The spacing of web frames is usually greater than (or some multiple of) the frame or beam spacing.

3.10
floor

substantial transverse bottom stiffener, which may be used to link frames and may also be a partial bulkhead

NOTE Floors are often used to support a cabin sole, so the upper edge is generally horizontal. On sailing craft, floors

are traditionally used to support ballast keels.
2 © ISO 2008 – All rights reserved
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SIST EN ISO 12215-6:2018
ISO 12215-6:2008(E)
3.11
girder

substantial longitudinal stiffening element, generally designated a primary member, which supports bottom

transverse frames or floors, other frames and beams
NOTE Bottom girders are sometimes called keelsons.
3.12
bracket

stiffening element, usually of triangular shape, used to reinforce the connection of two stiffeners and to reduce

their span
NOTE Brackets are also used to transmit local loads.
4 Symbols

Unless specifically otherwise defined, the symbols and units used in this part of ISO 12215 are given in

Table 1.
NOTE Symbols and units used only in the annexes are not included in Table 1.
Table 1 — Symbols
Symbol Designation Unit
A Design area of plating/stiffener mm
b Spacing between stiffeners mm
b Width of bonding flange mm
B Beam of hull, in accordance with ISO 8666 m
D Maximum depth of the boat, in accordance with ISO 8666 m
max
E Elastic modulus of stiffener N/mm
f Mechanical property coefficient for FRP and aluminium alloys 1
f Mechanical property coefficient for wood 1
I Second moment of stiffener cm
k , ..., k Coefficients for reinforcing thickness calculation 1
0 2
k , k Glue width coefficient 1
j jmin
l Span of stiffeners mm
L Length of hull, in accordance with ISO 8666 m
L Length of waterline, in accordance with ISO 8666 m
m Loaded displacement mass, in accordance with ISO 8666 kg
LDC
m Trailering mass, in accordance with ISO 8666 kg
P Maximum engine power kW
t Bottom plating thickness mm
t Thickness of plywood bulkhead mm
BHD
t Total thickness of top hat web mm
V Boat maximum speed in calm water knot
max
σ Design direct stress N/mm
σ Ultimate direct strength N/mm
τ Design shear stress N/mm
τ Ultimate shear strength N/mm
Ψ Glass content by mass 1
© ISO 2008 – All rights reserved 3
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SIST EN ISO 12215-6:2018
ISO 12215-6:2008(E)
5 General

Where the load and scantling determination have been accomplished for craft with a hull length, L , of

between 2,5 m and 24 m in accordance with
⎯ ISO 12215-5 for design pressure for monohulls and scantlings determination,
⎯ ISO 12215-7 for multihulls,
⎯ ISO 12215-8 for rudders, and
⎯ ISO 12215-9 for appendages and rig attachment,
structural arrangements and details shall comply with Clauses 6 to 11.

Where one of the two following methods prescribed in ISO 12215-5 have been used, the craft need only

comply with the requirements of Annex A:

a) for sailing craft with a length, L , of between 2,5 m and 9 m of design categories C and D, where

ISO 12215-5:2008, Annex A, has been used;

b) for craft with a length, L , of between 2,5 m and 6 m and of single skin FRP bottom construction, where

ISO 12215-5:2008, Annex B, has been used.
6 Structural arrangement
6.1 Stiffening
6.1.1 General

The hull, deck and deckhouse plating shall be stiffened as necessary to comply with ISO 12215-5, by any

combination of longitudinal and transverse conventional stiffeners, structural bulkheads, internal furniture such

as berths and shelves, and internal tray mouldings, providing these may be considered as “load bearing”. The

arrangement is usually made with stiffeners supported by deeper and stronger stiffeners, crossing

perpendicularly.

NOTE For small boats, “natural stiffeners” (i.e. elements that add stiffness, even if not dedicated for the purpose; see

ISO 12215-5:2008, 9.14), e.g. deck edge, round bilges, hard chines, keel, can define panels that need no further

stiffening.

Figures 1, 2 and 3 illustrate characteristic arrangements that comply with good practice. These figures apply

to both sailing and non-sailing craft, and combinations of arrangement within a single craft are acceptable.

Small boats (generally those of hull length less than about 9 m in length) employ natural stiffeners such as

deck edge, round bilges, hard chines, keel, etc. to define panels and then need no further stiffening. Larger

craft generally need to make greater use of the stiffener types described in 3.3 to 3.12.

6.1.2 Equivalence criteria

Other arrangements are possible, but these shall follow good practice principles (as illustrated by Figures 1, 2

and 3) of effective and smooth transmission of stresses due to pressure
...

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