ISO 13729:2020
(Main)Ships and marine technology — Ship's mooring and towing fittings — Closed chocks
Ships and marine technology — Ship's mooring and towing fittings — Closed chocks
This document specifies the types, nominal sizes, dimensions and materials, as well as construction, manufacturing and marking requirements, for closed chocks installed to lead the mooring and towing rope of a ship.
Navires et technologie maritime — Corps-morts et ferrures de remorquage de navires — Chaumards fermés
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INTERNATIONAL ISO
STANDARD 13729
Second edition
2020-08
Ships and marine technology —
Ship's mooring and towing fittings —
Closed chocks
Navires et technologie maritime — Corps-morts et ferrures de
remorquage de navires — Chaumards fermés
Reference number
ISO 13729:2020(E)
©
ISO 2020
---------------------- Page: 1 ----------------------
ISO 13729:2020(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2020
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
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii © ISO 2020 – All rights reserved
---------------------- Page: 2 ----------------------
ISO 13729:2020(E)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Classification . 1
4.1 Type . 1
4.2 Nominal sizes . 1
5 Dimensions . 2
6 Materials . 2
7 Construction . 2
8 Manufacturing and inspection . 2
9 Marking . 2
Annex A (normative) Basis for strength assessment of closed chocks . 9
Bibliography .14
© ISO 2020 – All rights reserved iii
---------------------- Page: 3 ----------------------
ISO 13729:2020(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 of the voluntary nature of standards, the meaning of ISO specific terms and
expressions related to conformity assessment, as well as information about ISO's adherence to
the World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT), see
www .iso .org/ iso/ foreword .html.
This document was prepared Technical Committee ISO/TC 8, Ships and marine technology, Subcommittee
SC 4, Outfitting and deck machinery.
The committee responsible for this document is Technical Committee ISO/TC 8, Ships and marine
technology, Subcommittee SC 4, Outfitting and deck machinery.
This second edition cancels and replaces the first edition (ISO 13729:2012), which has been technically
revised.
The main changes compared to the previous edition are as follows:
— technical guidelines have been added in 7.2and 7.3;
— the definition of SWL (3.1) has been reworded;
— the extension lines and dimension line in Figures 1 and 2 have been amended;
— technical information on FEM has been added in A.3.2.
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.
iv © ISO 2020 – All rights reserved
---------------------- Page: 4 ----------------------
ISO 13729:2020(E)
Introduction
The closed chock is a type of ship’s mooring and towing fitting installed on the shipside to lead the
mooring and towing rope from the ship’s inboard to outboard.
The closed chocks are normally adopted for ships which use wire ropes. The radius of chock surface
was designed based on the bending ratio of rope through the chock of not less than twelve times the
wire rope diameter.
© ISO 2020 – All rights reserved v
---------------------- Page: 5 ----------------------
INTERNATIONAL STANDARD ISO 13729:2020(E)
Ships and marine technology — Ship's mooring and towing
fittings — Closed chocks
1 Scope
This document specifies the types, nominal sizes, dimensions and materials, as well as construction,
manufacturing and marking requirements, for closed chocks installed to lead the mooring and towing
rope of a ship.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements 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.
IMO Circular MSC/Circ.1175, Guidance on shipboard towing and mooring equipment
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at http:// www .electropedia .org/
3.1
safe working load
SWL
safe load limit (maximum permissible load) of the fittings used for mooring and towing
4 Classification
4.1 Type
The closed chock shall be classified by its installation site as belonging to one of the following types:
a) Type A: deck-mounted closed chock;
b) Type B: bulwark-mounted closed chock.
4.2 Nominal sizes
The nominal sizes, L × H × D, of closed chocks are denoted by reference to the width and height of the
opening and the depth of the chock, in millimetres. For the closed chocks having the same size, the
letter of the alphabet, i.e. A or B, is followed by the nominal size for the different SWL.
The nominal sizes are:
250 × 200 × 214, 300 × 250 × 286, 350 × 250 × 333, 400 × 250 × 381, 450 × 250 × 381, 500 × 250 × 381,
400 × 250 × 428, 450 × 250 × 428, 500 × 250 × 428, 500 × 400 × 428, 500 × 250 × 525A, 500 × 400 ×
525A, 500 × 250 × 525B, 500 × 400 × 525B
© ISO 2020 – All rights reserved 1
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ISO 13729:2020(E)
5 Dimensions
The closed chocks shall have dimensions and particulars in accordance with Tables 1, 2, 3 and 4, and
Figures 1 and 2.
6 Materials
The following material shall be used for manufacturing the closed chocks:
2
— steel casting material, having a yield point of not less than 235 N/mm or equivalent.
The carbon contents of the steel casting shall not be more than 0,23 % considering weldability.
7 Construction
7.1 The foundation of the closed chocks shall be determined by considering the actual load direction.
The foundation and welding connections to the hull shall guarantee a reliable transmission of the
maximum loading of the closed chocks to the hull construction without any plastic deformation or cracks.
7.2 The selection of ship’s mooring fittings and mooring lines should take into account the diameter, D,
of surfaces of mooring fittings that are in contact with the mooring line diameter, d, (D/d ratio) to reduce
or mitigate bend ross of strength.
7.3 The tensile strength of mooring rope may be reduced depending on bend radius (D/d ratio)
through the mooring fittings, in accordance with the rope manufacturer’s guidelines.
8 Manufacturing and inspection
8.1 All surfaces of the closed chocks, including welded surfaces, shall be free from any visible flaws or
imperfections.
8.2 All surfaces in contact with the ropes shall be free from surfa
...
FINAL
INTERNATIONAL ISO/FDIS
DRAFT
STANDARD 13729
ISO/TC 8/SC 4
Ships and marine technology —
Secretariat: SAC
Ship's mooring and towing fittings —
Voting begins on:
20200525 Closed chocks
Voting terminates on:
Navires et technologie maritime — Corps-morts et ferrures de
20200720
remorquage de navires — Chaumards fermés
RECIPIENTS OF THIS DRAFT ARE INVITED TO
SUBMIT, WITH THEIR COMMENTS, NOTIFICATION
OF ANY RELEVANT PATENT RIGHTS OF WHICH
THEY ARE AWARE AND TO PROVIDE SUPPOR TING
DOCUMENTATION.
IN ADDITION TO THEIR EVALUATION AS
Reference number
BEING ACCEPTABLE FOR INDUSTRIAL, TECHNO
ISO/FDIS 13729:2020(E)
LOGICAL, COMMERCIAL AND USER PURPOSES,
DRAFT INTERNATIONAL STANDARDS MAY ON
OCCASION HAVE TO BE CONSIDERED IN THE
LIGHT OF THEIR POTENTIAL TO BECOME STAN
DARDS TO WHICH REFERENCE MAY BE MADE IN
©
NATIONAL REGULATIONS. ISO 2020
---------------------- Page: 1 ----------------------
ISO/FDIS 13729:2020(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2020
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
CH1214 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 2020 – All rights reserved
---------------------- Page: 2 ----------------------
ISO/FDIS 13729:2020(E)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Classification . 1
4.1 Type . 1
4.2 Nominal sizes . 1
5 Dimensions . 2
6 Materials . 2
7 Construction . 2
8 Manufacturing and inspection . 2
9 Marking . 2
Annex A (normative) Basis for strength assessment of closed chocks . 9
Bibliography .14
© ISO 2020 – All rights reserved iii
---------------------- Page: 3 ----------------------
ISO/FDIS 13729:2020(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 nongovernmental, 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 of the voluntary nature of standards, the meaning of ISO specific terms and
expressions related to conformity assessment, as well as information about ISO's adherence to
the World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT), see
www .iso .org/ iso/ foreword .html.
This document was prepared Technical Committee ISO/TC 8, Ships and marine technology, Subcommittee
SC 4, Outfitting and deck machinery.
The committee responsible for this document is Technical Committee ISO/TC 8, Ships and marine
technology, Subcommittee SC 4, Outfitting and deck machinery.
This second edition cancels and replaces the first edition (ISO 13729:2012), which has been technically
revised.
The main changes compared to the previous edition are as follows:
— technical guidelines have been added in 7.2;
— the definition of SWL (3.1) has been reworded;
— the extension lines and dimension line in Figures 1 and 2 have been amended;
— technical information on FEM has been added in A.3.1.
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.
iv © ISO 2020 – All rights reserved
---------------------- Page: 4 ----------------------
ISO/FDIS 13729:2020(E)
Introduction
The closed chock is a type of ship’s mooring and towing fitting installed on the shipside to lead the
mooring and towing rope from the ship’s inboard to outboard.
The closed chocks are normally adopted for ships which use wire ropes. The radius of chock surface
was designed based on the bending ratio of rope through the chock of not less than twelve times the
wire rope diameter.
© ISO 2020 – All rights reserved v
---------------------- Page: 5 ----------------------
FINAL DRAFT INTERNATIONAL STANDARD ISO/FDIS 13729:2020(E)
Ships and marine technology — Ship's mooring and towing
fittings — Closed chocks
1 Scope
This document specifies the types, nominal sizes, dimensions and materials, as well as construction,
manufacturing and marking requirements, for closed chocks installed to lead the mooring and towing
rope of a ship.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements 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.
IMO Circular MSC/Circ.1175, Guidance on shipboard towing and mooring equipment
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at http:// www .electropedia .org/
3.1
safe working load
SWL
safe load limit (maximum permissible load) of the fittings used for mooring and towing
4 Classification
4.1 Type
The closed chock shall be classified by its installation site as belonging to one of the following types:
a) Type A: deck-mounted closed chock;
b) Type B: bulwark-mounted closed chock.
4.2 Nominal sizes
The nominal sizes, L × H × D, of closed chocks are denoted by reference to the width and height of the
opening and the depth of the chock, in millimetres. For the closed chocks having the same size, the
letter of the alphabet, i.e. A or B, is followed by the nominal size for the different SWL.
The nominal sizes are:
250 × 200 × 214, 300 × 250 × 286, 350 × 250 × 333, 400 × 250 × 381, 450 × 250 × 381, 500 × 250 × 381,
400 × 250 × 428, 450 × 250 × 428, 500 × 250 × 428, 500 × 400 × 428, 500 × 250 × 525A, 500 × 400 ×
525A, 500 × 250 × 525B, 500 × 400 × 525B
© ISO 2020 – All rights reserved 1
---------------------- Page: 6 ----------------------
ISO/FDIS 13729:2020(E)
5 Dimensions
The closed chocks shall have dimensions and particulars in accordance with Tables 1, 2, 3 and 4, and
Figures 1 and 2.
6 Materials
The following material shall be used for manufacturing the closed chocks:
2
— steel casting material, having a yield point of not less than 235 N/mm or equivalent.
The carbon contents of the steel casting shall not be more than 0,23 % considering weldability.
7 Construction
7.1 The foundation of the closed chocks shall be determined by considering the actual load direction.
The foundation and welding connections to the hull shall guarantee a reliable transmission of the
maximum loading of the closed chocks to the hull construction without any plastic deformation or cracks.
7.2 The selection of ship’s mooring fittings and mooring lines should take into account the diameter, D,
of surfaces of mooring fittings that are in contact with the mooring line diameter, d, (D/d ratio) to reduce
or mitigate bend ross of strength.
7.3 The tensile strength of mooring rope may be reduced depending on bend radius (D/d ratio)
through the mooring fi
...
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