ISO 24045:2021

INTERNATIONAL ISO
STANDARD 24045
First edition
Ships and marine technology —
Adjustable roller-type chain stoppers
PROOF/ÉPREUVE
Reference number
ISO 24045:2021(E)
©
ISO 2021

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ISO 24045:2021(E)

COPYRIGHT PROTECTED DOCUMENT
© ISO 2021
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
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Published in Switzerland
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ISO 24045:2021(E)

Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Design, strength and safety requirements . 2
5 Function and operation requirements . 2
6 Structure . 3
7 Materials . 6
8 Acceptance . 7
9 Marking . 7
Annex A (normative) Strength calculations of adjustable roller-type chain stoppers .8
Annex B (informative) Precautions for manufacturers of adjustable roller-type chain stopper .14
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ISO 24045:2021(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
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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
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iso/ foreword .html.
This document was prepared by Technical Committee ISO/TC 8, Ships and marine technology,
Subcommittee SC 4, Outfitting and deck machinery.
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.
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INTERNATIONAL STANDARD ISO 24045:2021(E)
Ships and marine technology — Adjustable roller-type
chain stopper
1 Scope
This document specifies requirements for the design, strength, safety, function and operation of
adjustable roller-type chain stoppers. It also specifies their structure, materials, acceptance and
marking.
It is applicable to the design, manufacture and acceptance of adjustable roller-type chain stoppers.
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, Shipbuilding — Sea-going vessels — Windlass and anchor capstan
ISO 6325, Shipbuilding — Cable stoppers
ISO 7825, Shipbuilding — Deck machinery — General requirements
3 Terms and definitions
For the purpose of this document, the terms and definitions given in ISO 3828 and ISO 4568 and the
following 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 https:// www .electropedia .org/
3.1
adjustable roller-type chain stopper
device fixed to the ship structure, separated from the gypsy wheel and used for fixing the anchor chain
and for bearing the anchor tension
Note 1 to entry: After being installed on the ship structure, the position of the lever can be adjusted according to
the stowing condition of the anchor chain to achieve a better stowing effect. It can guide the anchor chain. When
the anchor chain passes on the chain guide groove and the roller, the anchor chain can be guided.
3.2
right-hand adjustable roller-type chain stopper
adjustable roller-type chain stopper that is opened and fixed on the right-hand side, when viewed from
the gypsy wheel to the chain stopper
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ISO 24045:2021(E)

3.3
left-hand adjustable roller-type chain stopper
adjustable roller-type chain stopper that is opened and fixed on the left-hand side, when viewed from
the gypsy wheel to the chain stopper
4 Design, strength and safety requirements
4.1 The adjustable roller-type chain stopper shall be designed and manufactured to withstand
a load without permanent deformation in accordance with the requirements of ISO 6325 for Class A
cable stoppers. The load shall be 80 % of the nominal breaking load of the anchor chain corresponding
diameter.
4.2 The nominal sizes of the anchor chain shall be in accordance with ISO 1704, Grade 3.
4.3 Adjustable roller-type chain stoppers shall meet the general requirements of ISO 7825 for deck
machinery and the specific requirements of 4.4 and 4.5.
4.4 The design stress of the load specified in 4.1 shall not exceed the yield stress of the material used.
The adjustable roller-type chain stopper shall be designed to prevent the generation of high bending
moments in the chain link. The strength calculations for adjustable roller-type chain stoppers shall be
according to Annex A.
4.5 The lever of the adjustable roller-type chain stopper shall be able to reliably and effectively prevent
itself from gradually moving to the open position when it is at the closed position, to avoid releasing and
throwing out the anchor chain. It shall be possible to operate the lever conveniently and to fix it reliably
when at the open position.
4.6 Precautions for manufacturers of adjustable roller-type chain stoppers are given in Annex B.
5 Function and operation requirements
5.1 The adjustable roller-type chain stopper shall be installed between the windlass and the hawse
pipe, which can effectively control the anchor chain during ship navigation, lock the anchor chain during
ship anchoring, and can bear 80 % of the nominal breaking load of the corresponding anchor chain.
5.2 The operation of the adjustable roller-type chain stopper shall be convenient and safe. Locking
devices shall be installed on parts that can cause danger to the operator due to unintentional actions.
5.3 Under no load, it shall be possible to manually operate the adjustable roller-type chain stopper.
The operating force of an anchor chain with a diameter of less than 84 mm shall not exceed 350 N, and
that of an anchor chain with a diameter of 84 mm or above shall not exceed 500 N.
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ISO 24045:2021(E)

6 Structure
6.1 The structure of adjustable roller-type chain stoppers is shown in Figure 1, and their main
dimensions are given in Table 1.
Key
1 support 10 washer
2 roller 11 cotter pin
3 bushing 12 balance weight
4 shaft 13 adjust block
5 oil cup 14 stop plate
6 chain guide groove 15 bolts
7 lever 16 balance weight fixed seat
8 pin 17 tonguing pin
9 pin shaft
NOTE The figure shows a left-hand adjustable roller-type chain stopper, to which the right-hand type is
symmetrical.
Figure 1 — Structure of adjustable roller-type chain stoppers
Table 1 — Main dimensions of adjustable roller-type chain stoppers
Anchor a
B B D d d L L L L H H T Mass
Nominal 1 1 1 2 3 1
chain
size
mm mm mm mm mm mm mm mm mm mm mm mm kg
size
52 50 to 52 306 850 560 170 300 1 060 340 110 125 480 910 20 ~1 340
56 54 to 56 326 896 600 185 310 1 120 365 115 135 540 980 20 ~1 700
60 58 to 60 348 948 640 195 320 1 220 390 125 150 600 1 010 20 ~2 100
a
When α + β > 35°, the diameter of the shaft can be reduced appropriately, which needs to be determined according to
calculation.
The dimensions in the table are for reference only and should be based on the results of strength calculation.
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ISO 24045:2021(E)

Table 1 (continued)
Anchor a
B B
...