ISO 4864:2023

INTERNATIONAL ISO
STANDARD 4864
First edition
2023-06
Ships and marine technology —
Jacking system appliances on
self-elevating unit — General
requirements
Navires et technologie maritime — Appareils pour système de levage
sur unité autoélévatrice — Exigences générales
Reference number
© ISO 2023
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Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Design . 3
4.1 General . 3
4.2 Design requirements for rack and pinion jacking system . 4
4.3 Design requirements for hydraulic yoke and pin jacking system . 4
5 Acceptance tests .5
5.1 General . 5
5.2 Hydraulic power unit (if any) . 5
5.3 Electrical control unit . 5
5.4 Security test . 5
5.5 Leg jacking test . 6
5.6 Pre-load test . 6
5.7 Hull jacking test . 6
5.8 Pulling leg test. 6
5.9 Full stroke jacking test . 6
6 Nameplate, packing, transport and storage . 7
6.1 Nameplate . 7
6.2 Packing, transport and storage . 7
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Foreword
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Subcommittee ISO/SC 4, Outfitting and deck machinery.
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INTERNATIONAL STANDARD ISO 4864:2023(E)
Ships and marine technology — Jacking system appliances
on self-elevating unit — General requirements
1 Scope
This document specifies general requirements for the jacking system appliances on self-elevating unit,
especially for the rack and pinion jacking system and yoke and pin jacking system. This document also
includes acceptance tests for the jacking system, and requirements for nameplate, packing, transport
and storage.
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
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
jacking system
system used to raise and lower a self-elevating unit or legs and transfer the load between the unit and
the legs
Note 1 to entry: The common types of the jacking system include hydraulic yoke and pin jacking system (3.2) and
rack and pinion jacking system (3.3).
3.2
hydraulic yoke and pin jacking system
jacking system (3.1) used to raise, lower and hold a self-elevating unit when the legs are in standing
state or to elevate, lower and hold legs when the unit is in floating state
Note 1 to entry: The system works by applying the force of the yokes and pins driven by the hydraulic cylinder to
holes on the unit legs.
3.3
rack and pinion jacking system
jacking system (3.1) used to raise, lower and hold a self-elevating unit when the legs are in standing
state or to elevate, lower and hold legs when the unit is in floating state
Note 1 to entry: The system functions by engaging the climbing gear with the transmission rack on the unit leg
driven by hydraulic or electric motors through a gearbox.
3.4
hull jacking speed
ratio of the displacement to the unit time during raising or lowering of the self-elevating unit when the
legs are in standing state
Note 1 to entry: For calculation of hull jacking speed for the hydraulic yoke and pin jacking system (3.2), the time
required for jacking and retracting the hydraulic cylinder as well as inserting and extracting pins shall be taken
into account.
3.5
leg jacking speed
ratio of displacement during raising or lowering of legs to the unit time when the self-elevating unit is
in floating state
Note 1 to entry: For calculation of leg jacking speed for the hydraulic yoke and pin jacking system (3.2), the time
required for jacking and retracting the hydraulic cylinder as well as inserting and extracting pins shall be taken
into account.
3.6
pre-load condition
state in which the bearable load of the pile reaches or exceeds the maximum load of the hull through
compaction of the foundation layer at the bottom of the footing by the jacking system (3.1) under the
allowable environmental condition
3.7
normal holding condition
state of normal operation under the allowable environmental condition
3.8
storm holding condition
state in which the self-elevating hull cannot continue operation but can achieve certain safety by
adjusting variable loads or abandoning partial loads as well as other measures under the extreme
environmental condition for which it is designed
3.9
afloat condition
state of the self-elevating unit during transit
3.10
normal jacking loading
load borne by the jacking system under the hull jacking condition
Note 1 to entry: The hull jacking conditio
...