prEN ISO 19905-1

Petroleum and natural gas industries - Site-specific assessment of mobile offshore units - Part 1: Jack-ups (ISO/DIS 19905-1:2022)

Erdöl- und Erdgasindustrie – Beurteilung von mobilen Offshore-Einheiten bezüglich ihres Einsatzgebietes – Teil 1: Hubinseln (ISO/DIS 19905-1:2022)

Industries du pétrole et du gaz naturel - Évaluation spécifique au site d'unités mobiles en mer - Partie 1: Plates-formes auto-élévatrices (ISO/DIS 19905-1:2022)

Industrija za predelavo nafte in zemeljskega plina - Ocenjevanje premičnih naftnih ploščadi na področju postavitve - 1. del: Dvižne ploščadi (ISO/DIS 19905-1:2022)

General Information

• Status: Not Published
• Publication Date: 10-Mar-2024
• ICS: 75.180.10 - Exploratory, drilling and extraction equipment
• Technical Committee: CEN/TC 12 - Materials, equipment and offshore structures for petroleum and natural gas industries
• Drafting Committee: CEN/TC 12 - Materials, equipment and offshore structures for petroleum and natural gas industries
• Current Stage: 4060 - Closure of enquiry - Enquiry
• Start Date: 06-May-2022
• Completion Date: 06-May-2022
• Ref Project: oSIST prEN ISO 19905-1:2022 - Petroleum and natural gas industries - Site-specific assessment of mobile offshore units - Part 1: Jack-ups (ISO/DIS 19905-1:2022)

Relations

• Revises: EN ISO 19905-1:2016 - Petroleum and natural gas industries - Site-specific assessment of mobile offshore units - Part 1: Jack-ups (ISO 19905-1:2016)
• Effective Date: 19-Jan-2023

Standards Content (Sample)

SLOVENSKI STANDARD
oSIST prEN ISO 19905-1:2022
01-april-2022

Industrija za predelavo nafte in zemeljskega plina - Ocenjevanje premičnih naftnih

ploščadi na področju postavitve - 1. del: Dvižne ploščadi (ISO/DIS 19905-1:2022)

Petroleum and natural gas industries - Site-specific assessment of mobile offshore units

- Part 1: Jack-ups (ISO/DIS 19905-1:2022)

Erdöl- und Erdgasindustrie – Beurteilung von mobilen Offshore-Einheiten bezüglich ihres

Einsatzgebietes – Teil 1: Hubinseln (ISO/DIS 19905-1:2022)

Industries du pétrole et du gaz naturel - Évaluation spécifique au site d'unités mobiles en

mer - Partie 1: Plates-formes auto-élévatrices (ISO/DIS 19905-1:2022)
Ta slovenski standard je istoveten z: prEN ISO 19905-1
ICS:
75.180.10 Oprema za raziskovanje, Exploratory, drilling and
vrtanje in odkopavanje extraction equipment
oSIST prEN ISO 19905-1:2022 en,fr,de

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

---------------------- Page: 1 ----------------------
oSIST prEN ISO 19905-1:2022
---------------------- Page: 2 ----------------------
oSIST prEN ISO 19905-1:2022
DRAFT INTERNATIONAL STANDARD
ISO/DIS 19905-1
ISO/TC 67/SC 7 Secretariat: BSI
Voting begins on: Voting terminates on:
2022-02-11 2022-05-06
Petroleum and natural gas industries — Site-specific
assessment of mobile offshore units —
Part 1:
Jack-ups

Industries du pétrole et du gaz naturel — Évaluation spécifique au site d'unités mobiles en mer —

Partie 1: Plates-formes auto-élévatrices
ICS: 75.180.10
This document is circulated as received from the committee secretariat.
THIS DOCUMENT IS A DRAFT CIRCULATED
FOR COMMENT AND APPROVAL. IT IS
ISO/CEN PARALLEL PROCESSING
THEREFORE SUBJECT TO CHANGE AND MAY
NOT BE REFERRED TO AS AN INTERNATIONAL
STANDARD UNTIL PUBLISHED AS SUCH.
IN ADDITION TO THEIR EVALUATION AS
BEING ACCEPTABLE FOR INDUSTRIAL,
TECHNOLOGICAL, COMMERCIAL AND
USER PURPOSES, DRAFT INTERNATIONAL
STANDARDS MAY ON OCCASION HAVE TO
BE CONSIDERED IN THE LIGHT OF THEIR
POTENTIAL TO BECOME STANDARDS TO
WHICH REFERENCE MAY BE MADE IN
Reference number
NATIONAL REGULATIONS.
ISO/DIS 19905-1:2022(E)
RECIPIENTS OF THIS DRAFT ARE INVITED
TO SUBMIT, WITH THEIR COMMENTS,
NOTIFICATION OF ANY RELEVANT PATENT
RIGHTS OF WHICH THEY ARE AWARE AND TO
PROVIDE SUPPORTING DOCUMENTATION. © ISO 2022
---------------------- Page: 3 ----------------------
oSIST prEN ISO 19905-1:2022
© ISO 2021 – All rights reserved
ISO/DIS 19905-1:2022(E)
ISO/TC 67/SC 7
Date: 2021-09-16
ISO/DIS 19905-1.D5:2021(E)
ISO/TC 67/SC 7/WG 7
Secretariat: BSI
Petroleum and natural gas industries — Site-specific assessment of
mobile offshore units — Part 1: Jack-ups

Industries du pétrole et du gaz naturel — Évaluation spécifique au site d’unités mobiles en mer — Partie 1:

Plates-formes auto-élévatrices
Warning

This document is not an ISO International Standard. It is distributed for review and comment. It is

subject to change without notice and may not be referred to as an International Standard.

Recipients of this draft are invited to submit, with their comments, notification of any relevant patent

rights of which they are aware and to provide supporting documentation.
Rev Date Details

D1 2017-11-10 Editorial and other topics from “to-do” Rev 5 at 2017-10-30, Annex E and refs thereto, VHM.

D2 2018-04-17 Added Annex E.4
2018-11-10 Updates to invoke Annex E.4

D3 2019-04-24 Earthquake consolidation, tubular member checks, GoMex annex + minor updates from 2019-04-30 in H3 +

lettered lists.
2019-09-05 Pre Sept meetings. Includes updates from May meetings and to date.
2019-10-08 With updates from September meetings of joint panels and P5.
2020-01-09 After ERP meeting of 2020-01-09
2020-02-10 After ERP meeting of 2020-02-10
2020-02-10 Merged with P4 responses
2020-02-25 After ERP meeting day 1
2020-05-07 For May meetings
2020-05-21 With P4 inputs from May meetings
COPYRIGHT PROTECTED DOCUMENT

2020-05-28 With P10 inputs from/post May meetings and ERP updates from 2020-05-28

D4 2020-11-05 With ERP updates from 2020-06-24, P1-2 inputs from end of July and more

D4 2020-12-07 With updates from 2020-11 Panel meetings
© ISO 2022
D4 2020-04-20 With latest figures & updates from first April ERP

All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may

D4 2020-04-28 With latest figures & updates from first and second April ERPs

be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on D4 2020-10-08 Updates from ERPs, final figures and clean-up

D5 2020-10-15 Final clean-up & minor edits to align with directives and improve readability.

the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below

D5 2020-11-17 Corrections of typos and grammar.
or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Document type: International Standard
Phone: [phone]
Document subtype:
Email: [e-mail]
Website: www.iso.org Document stage: (40) Enquiry
Document language: E
Published in Switzerland
STD Version 2.9p
© ISO 2022 – All rights reserved
---------------------- Page: 4 ----------------------
oSIST prEN ISO 19905-1:2022
ISO/DIS 19905-1:2022(E)
ISO/DIS 19905-1.D5:2021(E)
Contents Page

Foreword ........................................................................................................................................................................... x

Introduction ................................................................................................................................................................. xiii

1 Scope ..................................................................................................................................................................1

2 Normative references ..................................................................................................................................2

3 Terms and definitions .................................................................................................................................2

4 Symbols and abbreviated terms ........................................................................................................... 16

4.1 Symbols .......................................................................................................................................................... 16

4.2 Abbreviated terms ..................................................................................................................................... 18

5 Overall considerations ............................................................................................................................. 19

5.1 General ........................................................................................................................................................... 19

5.1.1 Interaction with ISO 19905-4 ................................................................................................................ 19

5.1.2 Competency .................................................................................................................................................. 20

5.1.3 Planning ......................................................................................................................................................... 20

5.1.4 Assessment situations and associated criteria ............................................................................... 20

5.1.5 Reporting ...................................................................................................................................................... 20

5.1.6 Regulations ................................................................................................................................................... 20

5.1.7 Classification of unit .................................................................................................................................. 20

5.2 Assessment approach ............................................................................................................................... 21

5.3 Selection of assessment situations ...................................................................................................... 23

5.4 Determination of assessment situations ........................................................................................... 24

5.4.1 General ........................................................................................................................................................... 24

5.4.2 Reaction point and foundation fixity .................................................................................................. 24

5.4.3 Extreme storm event approach angle ................................................................................................. 24

5.4.4 Weights and centre of gravity ................................................................................................................ 24

5.4.5 Hull elevation .............................................................................................................................................. 25

5.4.6 Leg length reserve...................................................................................................................................... 25

5.4.7 Adjacent structures ................................................................................................................................... 25

5.4.8 Other ............................................................................................................................................................... 25

5.5 Exposure levels ........................................................................................................................................... 25

5.5.1 Determination of exposure level .......................................................................................................... 25

5.5.2 Exposure level L1 ....................................................................................................................................... 25

5.5.3 Exposure level L2 ....................................................................................................................................... 26

5.5.4 Exposure level L3 ....................................................................................................................................... 26

5.5.5 Exposure level for earthquake .............................................................................................................. 26

5.6 Analytical tools ........................................................................................................................................... 26

6 Data to assemble for each site ............................................................................................................... 27

6.1 Applicability ................................................................................................................................................. 27

6.2 Jack-up data .................................................................................................................................................. 27

6.3 Site and operational data ........................................................................................................................ 27

6.4 Metocean data ............................................................................................................................................. 28

6.5 Geophysical and geotechnical data...................................................................................................... 29

6.6 Earthquake data ......................................................................................................................................... 29

6.7 Ice data ........................................................................................................................................................... 29

© ISO 2021 – All rights reserved
iii
© ISO 2022 – All rights reserved
---------------------- Page: 5 ----------------------
oSIST prEN ISO 19905-1:2022
ISO/DIS 19905-1:2022(E)
ISO/DIS 19905-1.D5:2021(E)

7 Actions ............................................................................................................................................................ 29

7.1 Applicability ................................................................................................................................................. 29

7.2 General ........................................................................................................................................................... 30

7.3 Metocean actions ........................................................................................................................................ 30

7.3.1 General ................................................................................................ ........................................................... 30

7.3.2 Hydrodynamic model ............................................................................................................................... 30

7.3.3 Wave and current actions ....................................................................................................................... 31

7.3.4 Wind actions ................................................................................................................................................ 31

7.4 Functional actions ...................................................................................................................................... 31

7.5 Displacement dependent effects .......................................................................................................... 31

7.6 Dynamic effects ........................................................................................................................................... 32

7.7 Earthquakes ................................................................................................................................................. 32

7.8 Ice actions ..................................................................................................................................................... 32

7.9 Other actions ................................................................................................................................................ 32

8 Structural modelling ................................................................................................................................. 32

8.1 Applicability ................................................................................................................................................. 32

8.2 Overall considerations ............................................................................................................................. 32

8.2.1 General ........................................................................................................................................................... 32

8.2.2 Modelling philosophy ............................................................................................................................... 32

8.2.3 Levels of FE modelling .............................................................................................................................. 33

8.3 Modelling the leg ........................................................................................................................................ 33

8.3.1 General ........................................................................................................................................................... 33

8.3.2 Detailed leg ................................................................................................................................................... 33

8.3.3 Equivalent leg (stick model) .................................................................................................................. 33

8.3.4 Combination of detailed and equivalent leg ..................................................................................... 33

8.3.5 Stiffness adjustment .................................................................................................................................. 34

8.3.6 Leg inclination ............................................................................................................................................. 34

8.4 Modelling the hull ...................................................................................................................................... 34

8.4.1 General ........................................................................................................................................................... 34

8.4.2 Detailed hull model ................................................................................................................................... 34

8.4.3 Equivalent hull model .............................................................................................................................. 34

8.5 Modelling the leg-to-hull connection .................................................................................................. 34

8.5.1 General ........................................................................................................................................................... 34

8.5.2 Guide systems .............................................................................................................................................. 34

8.5.3 Elevating system ......................................................................................................................................... 34

8.5.4 Fixation system ........................................................................................................................................... 35

8.5.5 Shock pad ⎯ floating jacking systems ................................................................................................ 35

8.5.6 Jackcase and associated bracing ........................................................................................................... 35

8.6 Modelling the spudcan and foundation.............................................................................................. 35

8.6.1 Spudcan structure ...................................................................................................................................... 35

8.6.2 Seabed reaction point ............................................................................................................................... 35

8.6.3 Foundation modelling .............................................................................................................................. 35

8.7 Mass modelling ........................................................................................................................................... 36

8.8 Application of actions ............................................................................................................................... 36

8.8.1 Assessment actions.................................................................................................................................... 36

8.8.2 Functional actions due to fixed load and variable load ................................................................ 38

8.8.3 Hull sagging .................................................................................................................................................. 38

8.8.4 Metocean actions ........................................................................................................................................ 39

8.8.5 Inertial actions ............................................................................................................................................ 39

8.8.6 Large displacement effects ..................................................................................................................... 39

8.8.7 Conductor actions ...................................................................................................................................... 39

8.8.8 Earthquake actions .................................................................................................................................... 39

© ISO 2021 – All rights reserved
© ISO 2022 – All rights reserved
---------------------- Page: 6 ----------------------
oSIST prEN ISO 19905-1:2022
ISO/DIS 19905-1:2022(E)
ISO/DIS 19905-1.D5:2021(E)

8.8.9 Ice actions ..................................................................................................................................................... 39

9 Foundations ................................................................................................................................................. 39

9.1 Applicability ................................................................................................................................................. 39

9.2 General ........................................................................................................................................................... 40

9.3 Geotechnical analysis of independent leg foundations ................................................................ 40

9.3.1 Foundation modelling and assessment .............................................................................................. 40

9.3.2 Leg penetration during preloading ..................................................................................................... 41

9.3.3 Yield interaction ......................................................................................................................................... 41

9.3.4 Foundation stiffnesses ............................................................................................................................. 42

9.3.5 Vertical-horizontal foundation capacity envelopes ...................................................................... 42

9.3.6 Acceptance checks ..................................................................................................................................... 43

9.4 Other considerations ................................................................................................................................ 44

9.4.1 Skirted spudcans ........................................................................................................................................ 44

9.4.2 Hard sloping strata .................................................................................................................................... 45

9.4.3 Footprint considerations ........................................................................................................................ 45

9.4.4 Leaning instability ..................................................................................................................................... 45

9.4.5 Leg extraction difficulties ....................................................................................................................... 45

9.4.6 Cyclic mobility, liquefaction and liquefaction-induced lateral flow ........................................ 45

9.4.7 Scour ............................................................................................................................................................... 46

9.4.8 Spudcan interaction with adjacent infrastructure ........................................................................ 46

9.4.9 Geohazards ................................................................................................................................................... 46

9.4.10 Carbonate material .................................................................................................................................... 46

10 Structural response ................................................................................................................................... 46

10.1 Applicability ................................................................................................................................................. 46

10.2 General considerations ............................................................................................................................ 47

10.3 Types of analyses and associated methods ...................................................................................... 47

10.4 Common parameters ................................................................................................................................ 48

10.4.1 General ........................................................................................................................................................... 48

10.4.2 Natural periods and affecting factors ................................................................................................. 48

10.4.3 Damping ........................................................................................................................................................ 49

10.4.4 Foundations ................................................................................................................................................. 49

10.4.5 Storm excitation ......................................................................................................................................... 50

10.5 Storm analysis ............................................................................................................................................. 50

10.5.1 General ........................................................................................................................................................... 50

10.5.2 Two-stage deterministic storm analysis ........................................................................................... 50

10.5.3 Stochastic storm analysis ........................................................................................................................ 52

10.5.4 Initial leg inclination ................................................................................................................................. 52

10.5.5 Limit state checks....................................................................................................................................... 52

10.6 Fatigue analysis .......................................................................................................................................... 53

10.7 Earthquake analysis .................................................................................................................................. 53

10.8 Ice ..................................................................................................................................................................... 54

10.8.1 General ........................................................................................................................................................... 54

10.8.2 ULS ................................................................................................................................................................... 54

10.8.3 ALS ................................................................................................................................................................... 55

10.8.4 Assessments in the area types ............................................................................................................... 55

10.8.5 Additional factors to be considered for arctic and cold regions ............................................... 55

10.9 Accidental situations ................................................................................................................................ 55

10.10 Alternative analysis methods ................................................................................................................ 55

10.10.1 Ultimate strength analysis ...................................................................................................................... 55

10.10.2 Methodology ................................................................................................................................................ 56

11 Long-term applications ............................................................................................................................ 56

© ISO 2021 – All rights reserved
© ISO 2022 – All rights reserved
---------------------- Page: 7 ----------------------
oSIST prEN ISO 19905-1:2022
ISO/DIS 19905-1:2022(E)
ISO/DIS 19905-1.D5:2021(E)

11.1 Applicability ................................................................................................................................................. 56

11.2 Assessment data ......................................................................................................................................... 56

11.3 Special requirements ...............................................................................

...