ISO 6325:2024

Ships and marine technology - Cable stoppers

This document specifies requirements for the types, sizes, design, construction, strength, safety, function, operation, installation and acceptance tests of cable stoppers. This document is applicable to the design, manufacturing and acceptance tests of cable stoppers for use with marine windlasses and anchor capstans as defined in ISO 4568.

Navires et technologie maritime — Stoppeurs de chaîne

General Information

• Status: Published
• Publication Date: 16-Sep-2024
• ICS: 47.020.50 - Deck equipment and installations
• Technical Committee: ISO/TC 8/SC 4 - Outfitting and deck machinery
• Drafting Committee: ISO/TC 8/SC 4 - Outfitting and deck machinery
• Current Stage: 6060 - International Standard published
• Start Date: 17-Sep-2024
• Due Date: 16-Apr-2025
• Completion Date: 17-Sep-2024

Relations

• Revises: ISO 6325:1987 - Shipbuilding - Cable stoppers
• Effective Date: 06-Jun-2022

Overview

ISO 6325:2024 - Ships and marine technology - Cable stoppers specifies requirements for the design, construction, testing and installation of cable stoppers used with marine windlasses and anchor capstans (as defined in ISO 4568). The standard covers types and sizes, strength and safety criteria, functional and operational requirements, acceptance tests, designation and marking - providing manufacturers, shipbuilders and operators with a uniform basis for safe and reliable chain-cable stopping devices.

Key topics and technical requirements

• Scope & applicability: Applies to cable stoppers for use with windlasses and anchor capstans; nominal sizes correspond to anchor chain sizes in ISO 1704.
• Types: Track-type (T), roller-type (R), combined track & roller (C), and combined with adjust block (D).
• Classes & strength:
  • Class A: withstands 80% of nominal breaking load without permanent deformation.
  • Class B: withstands 40% of nominal breaking load without permanent deformation.
• Materials & design: Environmental and material requirements referenced to ISO 7825:2017; designed stresses shall not exceed material yield stresses. Roller design must allow smooth chain passage and avoid high bending moments (see ISO 1704).
• Operational limits:
  • Envelope angle of chain ≥ 115°; horizontal sextant angle 0°–25°.
  • Manual operation force limits: ≤ 350 N for chain diameters < 80 mm; ≤ 500 N for diameters ≥ 80 mm (unloaded).
  • Lashing device (if fitted) must hold at least twice the anchor weight plus 10 m of chain; stresses in lashing ≤ 0.4 of yield stress; chain stress when lashed ≤ 0.2 of breaking strength.
• Safety & installation: Stoppers must lock reliably (prevent accidental opening), be easy and safe to operate, be fitted with locking devices on moving parts, and be positioned so anchor is close to storage location.
• Acceptance tests & inspection:
  • Visual inspection at manufacture (operation, roller rotation, surface/weld quality).
  • Tensile test on the first unit to class load (80%/40%) - factory inspection may be witnessed by classification society representative.
• Designation & marking: Standard defines detailed designation format (ISO 6325-A-L-R-100–3-115° example) and mandatory permanent marking (manufacturer, ISO number, class, chain size, grade, date, classification seal).

Applications and users

• Shipbuilders and naval architects specifying deck outfitting
• Deck machinery and marine equipment manufacturers
• Classification societies and surveyors for conformity verification
• Shipowners, operators and offshore vessel managers for procurement and maintenance
• Installation and maintenance crews implementing safe anchoring arrangements

Related standards

• ISO 1704 - Stud-link anchor chains
• ISO 4568 - Windlasses and anchor capstans
• ISO 3828 - Deck machinery vocabulary and symbols
• ISO 7825:2017 - Deck machinery - General requirements
• IACS UR W18 - Anchor chain accessories

Keywords: ISO 6325:2024, cable stoppers, ships and marine technology, windlasses, anchor capstans, chain cable, class A, class B, acceptance tests, installation.

Standards Content (Sample)

International
Standard
ISO 6325
Third edition
Ships and marine technology —
2024-09
Cable stoppers
Navires et technologie maritime — Stoppeurs de chaîne
Reference number
© ISO 2024
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: [phone]
Email: [e-mail]
Website: www.iso.org
Published in Switzerland
ii
Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Types and sizes . 2
4.1 Main types .2
4.2 Nominal sizes .5
5 Design, construction, strength and safety . 5
6 Functional, operational and installation requirements . 6
7 Acceptance tests . 7
8 Designation . 8
9 Marking . . 8
Bibliography . 9

iii
Foreword
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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
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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 document 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).
ISO draws attention to the possibility that the implementation of this document may involve the use of (a)
patent(s). ISO takes no position concerning the evidence, validity or applicability of any claimed patent
rights in respect thereof. As of the date of publication of this document, ISO had not received notice of (a)
patent(s) which may be required to implement this document. However, implementers are cautioned that
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Any trade name used in this document is information given for the convenience of users and does not
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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 by Technical Committee ISO/TC 8, Ships and marine technology, Subcommittee
SC 4, Outfitting and deck machinery.
This third edition cancels and replaces the second edition (ISO 6325:1987), which has been technically
revised.
The main changes are as follows:
— in Figure 3, a combined track and roller stopper with adjust block has been added;
— in 4.2, the nominal size of the cable stopper corresponding to the nominal size of anchor chain has been
added according to ISO 1704;
— in 5.1, designed environmental conditions and material requirements have been added;
— in 5.7, location design requirements of cable stopper have been added;
— in Clause 6, functional, operational and installation requirements have been added;
— in Clause 7, acceptance tests requirements have been added;
— Annex A and Annex B have been deleted.
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
International Standard ISO 6325:2024(en)
Ships and marine technology — Cable stoppers
1 Scope
This document specifies requirements for the types, sizes, design, construction, strength, safety, function,
operation, installation and acceptance tests of cable stoppers.
This document is applicable to the design, manufacturing and acceptance tests of cable stoppers for use with
marine windlasses and anchor capstans as defined in ISO 4568.
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.
ISO 1704, Ships and marine technology — Stud-link anchor chains
ISO 3828, Shipbuilding and marine structures — Deck machinery — Vocabulary and symbols
ISO 4568, Ships and marine technology — Sea-going vessels — Windlasses and anchor capstans
ISO 7825:2017, Shipbuilding — Deck machinery — General requirements
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 3828, ISO 4568 and the following apply.
ISO and IEC maintain terminology databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at https:// www .electropedia .org/
3.1
cable stopper
device which is secured to the ship’s structure, separate from the cable lifter, for the purpose of securing a
chain cable against the tension from the anchor
Note 1 to entry: The stopper also serves as a guide for the chain cable during operation.
3.2
class A cable stopper
cable stopper (3.1) designed and constructed to withstand, without permanent deformation, 80 % of the
nominal breaking load of the maximum diameter and the highest chain cable grade for which it is intended
3.3
class B cable stopper
cable stopper (3.1) designed and constructed to withstand, without permanent deformation, 40 % of the
nominal breaking load of the maximum diameter and the highest chain cable grade for which it is intended

3.4
right-hand cable stopper
cable stopper (3.1) which is operated from the right-hand side when seen from the cable lifter
Note 1 to entry: The right-hand cable stopper is shown in Figure 1.
3.5
left-hand cable stopper
cable stopper (3.1) which is operated from the left-hand side when seen from the cable lifter
Note
...