ISO 16173:2025
(Main)Ships and marine technology — Jacking system appliances on self-elevating unit — Rack pinion leg fixation system
Ships and marine technology — Jacking system appliances on self-elevating unit — Rack pinion leg fixation system
This document specifies requirements on the composition, classification, equipment, inspection, testing, designation, marking and documentation for the rack pinion leg fixation system of a self-elevating unit. This document is applicable to the design, manufacture, inspection and acceptance of leg fixation systems of self-elevating units.
Titre manque
General Information
Standards Content (Sample)
International
Standard
ISO 16173
First edition
Ships and marine technology —
2025-01
Jacking system appliances on self-
elevating unit — Rack pinion leg
fixation system
Reference number
© ISO 2025
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Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Composition and classification. 2
4.1 Composition .2
4.2 Classification .2
5 Technical requirements . 4
5.1 Design requirements .4
5.2 Mechanical fixation mechanism .5
5.3 Power unit . .6
5.4 Control system .7
5.4.1 General requirements .7
5.4.2 Main control system .7
5.4.3 Sub-control system .8
5.4.4 Remote control box .8
6 Inspection and testing . 8
6.1 Inspection .8
6.1.1 Material.8
6.1.2 Surface/internal quality .8
6.1.3 Dimensions .8
6.1.4 Coating/plating .8
6.2 Testing .9
6.2.1 Test arrangement .9
6.2.2 Pressure test .9
6.2.3 Safety protection testing .9
6.2.4 Locking and unlocking test .9
6.2.5 Static load bearing capacity test .10
6.3 Type testing and production testing .11
7 Designation .11
8 Marking . .11
9 Documentation .12
Bibliography .13
iii
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
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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
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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
complete listing of these bodies can be found at www.iso.org/members.html.
iv
International Standard ISO 16173:2025(en)
Ships and marine technology — Jacking system appliances on
self-elevating unit — Rack pinion leg fixation system
1 Scope
This document specifies requirements on the composition, classification, equipment, inspection, testing,
designation, marking and documentation for the rack pinion leg fixation system of a self-elevating unit.
This document is applicable to the design, manufacture, inspection and acceptance of leg fixation systems of
self-elevating units.
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 148-1, Metallic materials — Charpy pendulum impact test — Part 1: Test method
ISO 3662, Hydraulic fluid power — Pumps and motors — Geometric displacements
ISO 4413, Hydraulic fluid power — General rules and safety requirements for systems and their components
ISO 6892-1, Metallic materials — Tensile testing — Part 1: Method of test at room temperature
IEC 60079-1, Explosive atmospheres — Part 1: Equipment protection by flameproof enclosures "d"
IEC 60092-301, Electrical installations in ships — Part 301: Equipment — Generators and motors
IEC 60092-302-2, Electrical installations in ships — Part 302-2: Low voltage switchgear and controlgear
assemblies — Marine power
IEC 60092-360, Electrical installations in ships — Part 360: Insulating and sheathing materials for shipboard
and offshore units, power, control, instrumentation and telecommunication cables
IEC 60529, Degrees of protection provided by enclosures (IP code)
IACS Rec. No.68, Guidelines for non-destructive testing of hull and machinery steel forgings
3 Terms and definitions
For the purposes of this document, the following terms and definitions 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
self-elevating unit
mobile offshore unit with movable legs capable of raising its hull above the surface of the sea and lowering it
back into the sea
3.2
rack pinion leg fixation system
leg fixation system
mechanical system to keep the hull of a self-elevating unit (3.1) and legs stationary, where the unit is in the
elevated or the afloat condition
Note 1 to entry: Its main function is to establish a rigid connection between the hull and the pile legs by meshing and
fixing the rack chocks (3.4) with the pile leg racks after elevating the self-elevating unit or legs.
3.3
vertical design load
maximum working load that the leg fixation system (3.2) is able to withstand continuously in the vertical
direction
3.4
rack chock
important load which, during locking operation, is pushed by a power unit, engaged and fixed with pile leg
racks, and can withstand the pile leg supporting force and transfer the force to the unit hull through the
mechanical fixation mechanism, so as to keep rigid connection between hull and the pile legs
4 Composition and classification
4.1 Composition
4.1.1 The leg fixation system mainly includes the mechanical fixation mechanism, power unit and
control system.
4.1.2 The mechanical fixation mechanism generally includes the rack chock, screw and nut, wedge block
(top/bottom, if any) and hydraulic cylinder.
4.1.3 The power unit is generally divided into an electric power unit and hydraulic power unit. The electric
drive unit generally includes an electric motor and electromagnetic brake, while the hydraulic drive unit
generally includes a hydraulic motor and hydraulic pump station.
4.1.4 The control system generally includes the main control system, sub-control system and remote-
control box.
4.2 Classification
4.2.1 The leg fixation system is divided into two types according to the structural types.
a) Type A — leg fixation system with wedge blocks; see Figure 1.
b) Type B — leg fixation system without wedge block;
...
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