SIST EN ISO 19905-1:2024/A1:2025

SLOVENSKI STANDARD
01-september-2025
Naftna in plinska industrija, vključno z nizkoogljično energijo - Ocenjevanje
premičnih naftnih ploščadi na področju postavitve - 1. del: Dvižne ploščadi -
Dopolnilo A1 (ISO 19905-1:2023/Amd 1:2025)
Oil and gas industries including lower carbon energy - Site-specific assessment of
mobile offshore units - Part 1: Jack-ups: elevated at a site - Amendment 1 (ISO 19905-
1:2023/Amd 1:2025)
Öl- und Gasindustrie einschließlich kohlenstoffarmer Energieträger - Standortspezifische
Beurteilung mobiler Offshore-Einheiten - Teil 1: Hubinseln: aufgeständert an einem
Standort - Änderung 1 (ISO 19905-1:2023/Amd 1:2025)
Industries du pétrole et du gaz, y compris les énergies à faible teneur en carbone -
Évaluation spécifique du site d'unités mobiles en mer - Partie 1: Plateformes auto-
élévatrices : Surélévées sur un site - Amendement 1 (ISO 19905-1:2023/Amd 1:2025)
Ta slovenski standard je istoveten z: EN ISO 19905-1:2023/A1:2025
ICS:
75.180.10 Oprema za raziskovanje, Exploratory, drilling and
vrtanje in odkopavanje extraction equipment
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN ISO 19905-1:2023/A1
EUROPEAN STANDARD
NORME EUROPÉENNE
July 2025
EUROPÄISCHE NORM
ICS 75.180.10
English Version
Oil and gas industries including lower carbon energy -
Site-specific assessment of mobile offshore units - Part 1:
Jack-ups: elevated at a site - Amendment 1: Corrections to
strength of tubular members, Table B-2 and simplified
free-field liquefaction assessment calculation method (ISO
19905-1:2023/Amd 1:2025)
Industries du pétrole et du gaz, y compris les énergies Öl- und Gasindustrie einschließlich kohlenstoffarmer
à faible teneur en carbone - Évaluation spécifique du Energieträger - Standortspezifische Beurteilung
site d'unités mobiles en mer - Partie 1: Plateformes mobiler Offshore-Einheiten - Teil 1: Hubinseln:
auto-élévatrices : Surélévées sur un site - Amendement aufgeständert an einem Standort - Änderung 1 (ISO
1: Corrections apportées à la résistance des éléments 19905-1:2023/Amd 1:2025)
tubulaires, au Tableau B-2 et à la méthode de calcul
simplifiée par évaluation de la liquéfaction en champ
libre (ISO 19905-1:2023/Amd 1:2025)
This amendment A1 modifies the European Standard EN ISO 19905-1:2023; it was approved by CEN on 11 April 2025.

CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for inclusion of
this amendment into the relevant national standard without any alteration. Up-to-date lists and bibliographical references
concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN
member.
This amendment exists in three official versions (English, French, German). A version in any other language made by translation
under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management Centre has the
same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and
United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2025 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 19905-1:2023/A1:2025 E
worldwide for CEN national Members.

Contents Page
European foreword . 3

European foreword
This document (EN ISO 19905-1:2023/A1:2025) has been prepared by Technical Committee ISO/TC 67
"Oil and gas industries including lower carbon energy" in collaboration with Technical Committee
CEN/TC 12 “Oil and gas industries including lower carbon energy” the secretariat of which is held by
NEN.
This Amendment to the European Standard EN ISO 19905-1:2023 shall be given the status of a national
standard, either by publication of an identical text or by endorsement, at the latest by January 2026, and
conflicting national standards shall be withdrawn at the latest by January 2026.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN shall not be held responsible for identifying any or all such patent rights.
Any feedback and questions on this document should be directed to the users’ national standards
body/national committee. A complete listing of these bodies can be found on the CEN website.
According to the CEN-CENELEC Internal Regulations, the national standards organizations of the
following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria,
Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland,
Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Republic of
North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and the
United Kingdom.
Endorsement notice
The text of ISO 19905-1:2023/Amd 1:2025 has been approved by CEN as EN ISO 19905-
1:2023/A1:2025 without any modification.

International
Standard
ISO 19905-1
Third edition
Oil and gas industries including
2023-10
lower carbon energy — Site-
specific assessment of mobile
AMENDMENT 1
offshore units —
2025-06
Part 1:
Jack-ups: elevated at a site
AMENDMENT 1: Corrections to
strength of tubular members, Table B-2
and simplified free-field liquefaction
assessment calculation method
Industries du pétrole et du gaz, y compris les énergies à faible
teneur en carbone — Évaluation spécifique du site d'unités
mobiles en mer —
Partie 1: Plateformes auto-élévatrices : Surélévées sur un site
AMENDEMENT 1: Corrections apportées à la résistance des
éléments tubulaires, au Tableau B-2 et à la méthode de calcul
simplifiée par évaluation de la liquéfaction en champ libre
Reference number
ISO 19905-1:2023/Amd.1:2025(en) © ISO 2025

ISO 19905-1:2023/Amd.1:2025(en)
© ISO 2025
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on
the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below
or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii
ISO 19905-1:2023/Amd.1:2025(en)
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 with ISO, also take part in the work. ISO collaborates closely
with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.
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
ISO/IEC Directives, Part 2 (see www.iso.org/directives).
ISO draws attention to the possibility that the implementation of this document may involve the use of (a)
patent(s). ISO takes no position concerning the evidence, validity or applicability of any claimed patent
rights in respect thereof. As of the date of publication of this document, ISO had not received notice of (a)
patent(s) which may be required to implement this document. However, implementers are cautioned that
this may not represent the latest information, which may be obtained from the patent database available at
www.iso.org/patents. ISO shall not be held responsible for identifying any or all such patent rights.
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and expressions
related to conformity assessment, as well as information about ISO's adherence to the World Trade
Organization (WTO) principles in the Technical Barriers to Trade (TBT), see www.iso.org/iso/foreword.html.
This document was prepared by Technical Committee ISO/TC 67, Oil and gas industries including lower
carbon energy, Subcommittee SC 7, Offshore structures, in collaboration with the European Committee for
Standardization (CEN) Technical Committee CEN/TC 12, Oil and gas industries including lower carbon energy,
in accordance with the Agreement on technical cooperation between ISO and CEN (Vienna Agreement).
A list of all parts in the ISO 19905 series can be found on the ISO website.
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.

iii
ISO 19905-1:2023/Amd.1:2025(en)
Oil and gas industries including lower carbon energy — Site-
specific assessment of mobile offshore units —
Part 1:
Jack-ups: elevated at a site
AMENDMENT 1: Corrections to strength of tubular members,
Table B-2 and simplified free-field liquefaction assessment
calculation method
A.9.4.6.5.1
Replace the second paragraph with the following:
*
The simplified methods provide a ratio of normalized cyclic resistance ratio λ over normalized cyclic
CRR
*
stress ratio λ giving a margin against triggering of liquefaction, i.e.
CSR
**
f =λλ/
trig CRRCSR
A.9.4.6.5.2
Replace the text with the following:
A.9.4.6.5.2  Cyclic shear stress ratio and cyclic resistance ratio
[165] [101] [210]
Simplified methods Seed and Idriss (1971) , Idriss (1999) , Youd et al. (2001) , Zhang et al.
[214] [105]
(2002) , Idriss and Boulanger (2006) can be used to further assess the free-field liquefaction potential
*
within the upper part of the soil profile by estimating the normalized cyclic stress ratio (λ ) and
CSR
*
comparing it to the normalized cyclic resistance ratio (λ ) computed from cone penetration test
CRR
[139] [30]
resistance (Moss et al., 2006 ; Boulanger and Idriss, 2016 ) or in situ shear wave velocity (Kayen et al.,
[115] [156]
2013 ; Robertson, 2015 ).
* *
Possible free-field liquefaction assessment methods to calculate λ and λ are provided in Clause E.5.
CRR CSR
A.12.5.2.1
Replace Formula (A.12.5-3) with the following:
 
 
T
u
 
F =−1 F (A.12.5-3)
 
yT, y
 
 T /γ 
()
vR,Tv
 
 
ISO 19905-1:2023/Amd.1:2025(en)
A.12.5.3.3
Replace the text with the following:
A.12.5.3.3  Combined axial tension or compression, bending, shear and torsion strength check
The effect of shear on the strength of tubular members subjected to axial tension or compression or bending
should be taken into account using the applicable formula given in this subclause.
The tensile strength, AF , is given by Formula (A.12.5-21):
y,T,v
 
V
 
if ≤04,
V
 
 
AF =−1,,000 0 104 AF P
yT,,v yT, v
 
   
P
v
 
γ
 
 RT, v 
 γ 
RT, v
  
 
V
 
if 04,,00< ≤ 80
V
 
AF =−1,,117 0 396 AF  P 
yT,,v yT, v
 
 P   
v
  γ
   RT, v 
 γ 
  RT, v 
 
V
 
if 08,,00< ≤ 96
V
 
AF =−1,,600 1 000 AF  P 
yT,,v yT, v
 
 P   
v
 
γ
   RT, v 
 γ 
  RT, v 
 
V
 
if >09, 6
V
 
 P 
AF =−4,,000 3 500 AF
(A.12.5-21)
yT,,v yT, v
 
 P   
v
 
γ
  RT, v
 
 
γ
RT, v
  
The representative local buckling strength, P , is given by Formula (A.12.5-22):
yc,v
 
V
 
if ≤04,
V
 
 
P =−1,,000 0 104 P P
yc,v yc v
 
   
P
v
 
γ
  RT, v
 
 γ 
RT, v
  
 
V
 
if 04,,00< ≤ 80
V
 
P =−1,,117 0 396 P  P 
yc,v yc v
 
 P   
v
  γ
   RT, v 
 γ 
  RT, v 
 
V
 
if 08,,00< ≤ 96
V
 
P =−1,,600 1 000 P  P 
yc,v yc v
 
 
P  
v
 
γ
 
 RT, v 
 γ 
  RT, v 
 
V
 
if >09, 6
V
 
P =−4,,000 3 500 P  P 
(A.12.5-22)
yc,v yc v
 
 P   
v
 
γ
  RT, v
 
 γ 
RT, v
  
ISO 19905-1:2023/Amd.1:2025(en)
The representative bending moment strength, M , is given by Formula (A.12.5-23):
b,v
 
V
 
if ≤05,
V
 
M =−1,,000 0 078 M  P 
bv, b v
 
 P   
v
 
γ
   RT, v 
 γ 
  RT, v 
 
V
 
if 05,,00< ≤ 85
V
 
 
M =−1,,103 0 284 M P
bv, b v
 
   
P
v
 
γ
  RT, v
 
 γ 
RT, v
  
 
V
 
if 08,,50< ≤ 98
V
 
M =−1,,489 0 739 M  P 
bv, b v
 
 P   
v
  γ
   RT, v 
 γ 
  RT, v 
 
V
 
if >09, 8
V
 
M =−3,,621 2 914 M  P 
...