ISO 21711:2019

INTERNATIONAL ISO
STANDARD 21711
First edition
2019-04
Marine structures — Mobile offshore
units — Chain wheels
Structures maritimes — Unités mobiles au large — Pignons à chaîne
Reference number
ISO 21711:2019(E)
©
ISO 2019

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ISO 21711:2019(E)

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ii © ISO 2019 – All rights reserved

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ISO 21711:2019(E)

Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Classification . 2
4.1 Types of the chain wheels . 2
4.2 Designation . 7
5 Requirements . 7
5.1 Geometric tolerance and dimensional tolerance . 7
5.2 Materials . 8
6 Inspection . 8
6.1 Dimensional and geometric inspection . 8
6.2 Visual inspection for surface quality . 8
6.3 Inspection of tooth surface hardness . 8
6.4 Material inspection. 8
Bibliography . 9
© ISO 2019 – All rights reserved iii

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ISO 21711:2019(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
...