ISO 13713:2020

INTERNATIONAL ISO
STANDARD 13713
Second edition
2020-08
Ships and marine technology —
Ship's mooring and towing fittings —
Mooring chocks
Navires et technologie maritime — Corps-morts et ferrures de
remorquage de navires — Chaumards
Reference number
©
ISO 2020
© ISO 2020
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ii © ISO 2020 – All rights reserved

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 mooring chocks . 7
Bibliography .11
Foreword
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electrotechnical standardization.
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This document was prepared 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 13713:2012), 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 leader line in Figure 1 has 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

Introduction
The mooring 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 mooring chocks are normally adopted for ships which use nylon or other synthetic ropes other
than wire ropes considering the small bending ratio (for wire ropes, see ISO 13729).
INTERNATIONAL STANDARD ISO 13713:2020(E)
Ships and marine technology — Ship's mooring and towing
fittings — Mooring chocks
1 Scope
This document specifies the types, nominal sizes, dimensions and materials, as well as construction,
manufacturing and marking requirements, for mooring 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 mooring chocks shall be classified by its installation site as belonging to one of the following types:
a) Type A: deck-mounted mooring chock;
b) Type B: bulwark-mounted mooring chock.
4.2 Nominal sizes
The nominal sizes, L × H, of mooring chocks are denoted by reference to the width and height of the
opening of the chock, in millimetres. For the mooring chocks having the same size, the letter of the
alphabet, i.e. A or B, is followed by the nominal size for the different safe working loads (SWL).
...