ISO 4568:2021

INTERNATIONAL ISO
STANDARD 4568
Fourth edition
2021-08
Ships and marine technology — Sea-
going vessels — Windlasses and
anchor capstans
Navires et technologie maritime — Navires de haute mer —
Guindeaux et guindeaux-cabestans
Reference number
©
ISO 2021
© ISO 2021
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ii © ISO 2021 – All rights reserved

Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Design and construction . 3
4.1 Chain cable. 3
4.2 Cable-lifter . 3
4.3 Warping ends . 3
4.4 Mooring winch . 4
4.5 Strength requirements . 4
4.6 Braking system . 4
4.6.1 Control braking system . 4
4.6.2 Cable-lifter brake . 4
4.7 Emergency stop . 5
4.8 Protection . 5
4.9 Speed control . 5
4.10 Direction of motion of operating devices . 5
4.11 Drive equipment . 5
4.12 Remote control devices . 6
5 Requirements . 6
6 Acceptance tests . 7
7 Designation . 8
8 Marking . 8
Annex A (informative) Additional information from the purchaser .11
Bibliography .12
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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electrotechnical standardization.
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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).
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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, in collaboration with Technical Committee ISO/TC 4,
Rolling bearings.
This fourth edition cancels and replaces the third edition (ISO 4568:2006), which has been technically
revised.
The main changes compared to the previous edition are:
— the definitions of working load (3.1), nominal size (3.2) and overload pull (3.3) have been revised;
— the definition of nominal recovery speed (former 3.5 in the previous edition) has been deleted;
— new definitions for windlass (3.5), double cable-lifter windlass with connection shaft (3.10) and
control braking system (3.11) have been added;
— requirements have been added on: the mooring winch, in 4.4 and 5.4; the design of the cable lifter,
in 4.6.2.2; and the electric motor, in 4.11.2 and 4.11.3;
— the strength requirements have been updated in 4.5;
— test methods have been added in 6.3 to 6.9.
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 2021 – All rights reserved

INTERNATIONAL STANDARD ISO 4568:2021(E)
Ships and marine technology — Sea-going vessels —
Windlasses and anchor capstans
1 Scope
This document specifies requirements for the design, construction, safety, performance and acceptance
testing of windlasses and anchor capstans.
This document is applicable to windlasses and anchor capstans of sea-going vessels, which have an
electric, hydraulic, pneumatic or external drive, of the following types:
— symmetrical double cable-lifter windlasses (type 1);
— single cable-lifter windlasses (type 2);
— single cable-lifter windlass units (types 3 and 4);
— anchor capstans (type 5);
— double cable-lifter windlasses with connecting shaft (type 6).
For combined windlasses/mooring winches, ISO 3730 is applicable in addition to this document.
NOTE Attention is drawn to the requirements of relevant Classification Societies or the government of the
state whose flag the ship is entitled to fly.
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 3730, Shipbuilding and marine structures — Mooring winches
ISO 3828, Shipbuilding and marine structures — Deck machinery — Vocabulary and symbols
ISO 4413, Hydraulic fluid power — General rules and safety requirements for systems and their components
ISO 6482, Shipbuilding — Deck machinery — Warping end profiles
ISO 7825, Shipbuilding — Deck machinery — General requirements
IEC 60092 (all parts), Electrical installations in ships
IEC 60529, Degrees of protection provided by enclosures (IP Code)
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 3828 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
working load
F
w
continuous working load that the prime mover of the windlass or anchor
capstan is able to apply for 30 min, derived from the chain cable diameter and the chain cable grade
3.2
nominal size
size expressed in terms of chain cable diameter, in millimetres, grade of
chain cable, holding load and maximum anchorage depth
Note 1 to entry: When the maximum anchorage depth is below 82,5 m, it is not expressed.
EXAMPLE 100/3/45- 100 m is the size designation of a windlass for a 100 mm diameter chain cable of IACS
1)
Grade 3, with a holding load of 45 % of the breaking load of the chain cable, and a maximum anchorage depth of
100 m.
3.3
overload pull
short-time overload capacity necessary for the windlass or anchor capstan to break ground, provided
by the windlass or anchor capstan prime mover
3.4
holding load
maximum static load on the chain cable that the cable-lifter brake can withstand
3.5
windlass
machine in which the cable-lifter is mounted on a horizontal shaft
3.6
symmetrical double cable-lifter windlass (type 1)
fully powered windlass with two symmetrical cable-lifters
Note 1 to entry: For the purposes of designation, it corresponds to Type 1, see Clause 7 and Figure 1.
3.7
single cable-lifter windlass (type 2)
single fully powered windlass with one cable-lifter
Note 1 to entry: For the purposes of designation, it corresponds to Type 2, see Clause 7 and Figure 2.
3.8
single cable-lifter windlass unit (types 3 and 4)
windlass unit in which one cable-lifter is provided with an external power source
Note 1 to entry: For the purposes of designation, it corresponds to Types 3 and 4, see Clause 7 and Figures 3
and 4.
3.9
anchor capstan (type 5)
machine in which the cable-lifter is mounted on a vertical shaft
Note 1 to entry: See Figure 5 and ISO 3828 for a complete definition.

1) International Association of Classification Societies.
2 © ISO 2021 – All rights reserved

3.10
double cable-lifter windlass with connecting shaft (type 6)
fully powered windlass in which two drive motors with two cable-lifters are connected by a shaft joint
Note 1 to entry: The cable-lifter can be driven by either drive motor.
Note 2 to entry: See Figure 6.
3.11
control braking system
device capable of automatically and stably braking a windlass or anchor capstan when the later are
stopped, downtime, power off or any other non-operating state
3.12 Right- and left-hand windlasses
3.12.1
right-hand windlass
windlass where the drive for the cable-lifter or cable-lifter unit is on the right-hand side of the cable-
lifter, in relation to an observer situated on the side of the motor, power supply or controller
3.12.2
left-hand windlass
windlass where the drive for the cable-lifter or cable-lifter unit is on the left-hand side of the cable-
lifter, in relation to an observer situated on the side of the motor, power supply or controll
...