ISO 21125:2019

INTERNATIONAL ISO
STANDARD 21125
First edition
2019-06
Ships and marine technology —
Marine cranes — Manufacturing
requirements
Navires et technologie maritime — Grues marines — Exigences de
fabrication
Reference number
©
ISO 2019
© ISO 2019
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ii © ISO 2019 – All rights reserved

Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 2
4 General requirements . 2
5 Fabrication standard . 2
5.1 Materials . 2
5.2 Welded connection of steel plates . 2
5.3 Machinery processing . 4
5.4 Anticorrosion and oil seal . 5
6 Mechanical, hydraulic and electrical assembly . 5
6.1 Field requirements . 5
6.2 Mechanical assembly . 5
6.3 Hydraulic assembly . 6
6.4 Installation of electrical system. 6
6.4.1 General requirements . 6
6.4.2 Cable lay . 6
6.5 Other installations . 6
6.6 Shipboard installation . 7
7 Lubricating, oil sealing and coating . 7
8 Tests . 8
9 Markings and plates . 8
Bibliography . 9
Foreword
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electrotechnical standardization.
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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
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iv © ISO 2019 – All rights reserved

INTERNATIONAL STANDARD ISO 21125:2019(E)
Ships and marine technology — Marine cranes —
Manufacturing requirements
1 Scope
This document specifies the general technical manufacturing requirements for marine cranes of metal
construction.
This document is applicable to the following types of marine cranes:
— deck cranes mounted on ships for handling cargo or containers in harbour conditions;
— floating cranes or grab cranes mounted on barges or pontoons for operating in harbour conditions;
— engine room cranes and provision cranes, etc. mounted on ships (including floating docks) for
handling equipment and stores in harbour conditions.
NOTE Marine cranes in other types of crane can refer to this document.
This document does not apply to cranes manufactured to operate in:
— ambient operating temperatures below −20 °C;
— ambient operating temperatures above +45 °C;
— lifting operations below sea level;
— lifting operations involving more than one crane;
— emergency rescue operations;
— shore-side cargo handling cranes;
— lifting lifeboats, liferafts accommodation ladders, pilot ladders, gangways and their handling
appliances;
— launching appliances for survival craft and rescue boats.
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 3828, Shipbuilding and marine structures — Deck machinery — Vocabulary and symbols
ISO 4306-1, Cranes — Vocabulary — Part 1: General
ISO 19354:2016, Ships and marine technology — Marine cranes — General requirements
ISO 19355, Ships and marine technology — Marine cranes — Structural requirements
ISO 19356, Ships and marine technology — Marine cranes — Test specifications and procedures
ISO 19360, Ships and marine technology — Marine cranes — Technical requirements for rigging
applications
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 4306-1, ISO 3828 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 http: //www .electropedia .org/
3.1
oil sealing
process of coating the machining surface of metal components with anti-corrosion grease to prevent
corrosion
4 General requirements
The manufacturing of marine cranes shall be in accordance with ISO 19354, ISO 19355, ISO 19356 and
ISO 19360.
5 Fabrication standard
5.1 Materials
5.1.1 Materials of marine cranes shall meet the requirements of 4.3 in ISO 19354:2016.
5.1.2 Detailed test records shall be kept for all the specified materials requiring testing. Inspection
certificates shall be provided for the inspected materials required by a ship inspection institution.
5.2 Welded connection of steel plates
5.2.1 The connection of components of different thickness shall be in accordance with Table 1.
Table 1 — Requirements for the connection of components of different thickness
Butting form Transitional slope
a:b ≤ 1:3
a:b ≤ 1:3
NOTE  If the thickness difference is less than 4 mm, the connection can be done by its shape evenly within the welding width.
2 © ISO 2019 – All rights reserved

5.2.4 The mismatch allowable value of single-sided or double-sided butt welding bevel is given in
Table 2.
Table 2 — Allowable value for mismatch of different butting forms
Allowable value for mismatch
Butting form
(mm)
Double-sided welded seam for isopachous plates
Δa < 0,10 × s, maximum 2
(s is the plate thickness)
Single-sided welded seam for isopachous plates
Δa < 0,10 × s, maximum 2
(s is the plate thickness)
Butt we
...