Petroleum and natural gas industries - Fixed steel offshore structures (ISO 19902:2020)

This document specifies requirements and provides recommendations applicable to the following types
of fixed steel offshore structures for the petroleum and natural gas industries:
— caissons, free-standing and braced;
— jackets;
— monotowers;
— towers.
In addition, it is applicable to compliant bottom founded structures, steel gravity structures, jack-ups,
other bottom founded structures and other structures related to offshore structures (such as underwater
oil storage tanks, bridges and connecting structures).
This document contains requirements for planning and engineering of the design, fabrication,
transportation and installation of new structures as well as, if relevant, their future removal.
NOTE 1 Specific requirements for the design of fixed steel offshore structures in arctic environments are presented
in ISO 19906.
NOTE 2 Requirements for topsides structures are presented in ISO 19901-3; for marine operations in,
ISO 19901-6; for structural integrity management, in ISO 19901-9 and for the site-specific assessment of jack-ups,
in ISO 19905-1.

Erdöl- und Erdgasindustrie - Gegründete Stahlplattformen (ISO 19902:2020)

Industries du pétrole et du gaz naturel - Structures en mer fixes en acier (ISO 19902:2020)

Industrija za predelavo nafte in zemeljskega plina - Varjene jeklene konstrukcije naftnih ploščadi (ISO 19902:2020)

General Information

Status
Published
Public Enquiry End Date
31-May-2018
Publication Date
08-Dec-2020
Technical Committee
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
03-Dec-2020
Due Date
07-Feb-2021
Completion Date
09-Dec-2020

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SLOVENSKI STANDARD
SIST EN ISO 19902:2021
01-januar-2021
Nadomešča:
SIST EN ISO 19902:2008
SIST EN ISO 19902:2008/A1:2014

Industrija za predelavo nafte in zemeljskega plina - Varjene jeklene konstrukcije

naftnih ploščadi (ISO 19902:2020)

Petroleum and natural gas industries - Fixed steel offshore structures (ISO 19902:2020)

Erdöl- und Erdgasindustrie - Gegründete Stahlplattformen (ISO 19902:2020)
Industries du pétrole et du gaz naturel - Structures en mer fixes en acier (ISO
19902:2020)
Ta slovenski standard je istoveten z: EN ISO 19902:2020
ICS:
75.180.10 Oprema za raziskovanje, Exploratory, drilling and
vrtanje in odkopavanje extraction equipment
91.080.13 Jeklene konstrukcije Steel structures
SIST EN ISO 19902:2021 en,fr,de

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

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SIST EN ISO 19902:2021
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SIST EN ISO 19902:2021
EN ISO 19902
EUROPEAN STANDARD
NORME EUROPÉENNE
November 2020
EUROPÄISCHE NORM
ICS 75.180.10 Supersedes EN ISO 19902:2007
English Version
Petroleum and natural gas industries - Fixed steel offshore
structures (ISO 19902:2020)

Industries du pétrole et du gaz naturel - Structures en Erdöl- und Erdgasindustrie - Gegründete

mer fixes en acier (ISO 19902:2020) Stahlplattformen (ISO 19902:2020)
This European Standard was approved by CEN on 16 June 2020.

CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this

European Standard the status of a 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 European Standard 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, Turkey 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

© 2020 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 19902:2020 E

worldwide for CEN national Members.
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SIST EN ISO 19902:2021
EN ISO 19902:2020 (E)
Contents Page

European foreword ....................................................................................................................................................... 3

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SIST EN ISO 19902:2021
EN ISO 19902:2020 (E)
European foreword

This document (EN ISO 19902:2020) has been prepared by Technical Committee ISO/TC 67 "Materials,

equipment and offshore structures for petroleum, petrochemical and natural gas industries" in

collaboration with Technical Committee CEN/TC 12 “Materials, equipment and offshore structures for

petroleum, petrochemical and natural gas industries” the secretariat of which is held by NEN.

This European Standard shall be given the status of a national standard, either by publication of an

identical text or by endorsement, at the latest by May 2021, and conflicting national standards shall be

withdrawn at the latest by May 2021.

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.

This document supersedes EN ISO 19902:2007.

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, Turkey and the

United Kingdom.
Endorsement notice

The text of ISO 19902:2020 has been approved by CEN as EN ISO 19902:2020 without any modification.

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SIST EN ISO 19902:2021
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SIST EN ISO 19902:2021
INTERNATIONAL ISO
STANDARD 19902
Second edition
2020-11
Petroleum and natural gas
industries — Fixed steel offshore
structures
Industries du pétrole et du gaz naturel — Structures en mer fixes
en acier
Reference number
ISO 19902:2020(E)
ISO 2020
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SIST EN ISO 19902:2021
ISO 19902:2020(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2020

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 2020 – All rights reserved
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SIST EN ISO 19902:2021
ISO 19902:2020(E)
Contents Page

Foreword ....................................................................................................................................................................... xiv

Introduction ................................................................................................................................................................ xvii

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

2 Normative references ....................................................................................................................................... 1

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

4 Symbols ............................................................................................................................................................... 10

5 Abbreviated terms .......................................................................................................................................... 14

6 Overall considerations ................................................................................................................................... 16

6.1 Types of fixed steel offshore structure ....................................................................................... 16

6.1.1 General .................................................................................................................................. 16

6.1.2 Jackets ................................................................................................................................... 16

6.1.3 Towers ................................................................................................................................... 17

6.1.4 Jack-ups ................................................................................................................................. 17

6.2 Planning ................................................................................................................................................. 18

6.2.1 General .................................................................................................................................. 18

6.2.2 Hazards ................................................................................................................................. 18

6.2.3 Designing for hazards ...................................................................................................... 19

6.2.4 Design situations and criteria ....................................................................................... 19

6.2.5 Design for inspection and maintenance .................................................................... 19

6.2.6 Foundations and active geological processes ......................................................... 20

6.2.7 Regulations .......................................................................................................................... 20

6.3 Service and operational considerations .................................................................................... 20

6.3.1 General considerations ................................................................................................... 20

6.3.2 Water depth ......................................................................................................................... 20

6.3.3 Structural configuration ................................................................................................. 20

6.3.4 Access and auxiliary systems ........................................................................................ 21

6.4 Safety considerations........................................................................................................................ 21

6.5 Environmental considerations ...................................................................................................... 21

6.5.1 General .................................................................................................................................. 21

6.5.2 Selecting design metocean parameters and action factors ................................ 22

6.6 Exposure levels ................................................................................................................................... 22

6.7 Assessment of existing structures................................................................................................ 23

6.8 Structure reuse ................................................................................................................................... 23

7 General design requirements ...................................................................................................................... 23

7.1 General ................................................................................................................................................... 23

7.2 Material properties for steel .......................................................................................................... 24

7.3 Incorporating limit states ............................................................................................................... 24

7.4 Determining design situations ...................................................................................................... 24

7.5 Structural modelling and analysis ............................................................................................... 25

7.6 Design for pre-service and removal situations ....................................................................... 25

7.7 Design for the in-place situation................................................................................................... 25

7.8 Determination of component resistances ................................................................................. 25

7.8.1 General .................................................................................................................................. 25

7.8.2 Physical testing to derive resistances ........................................................................ 26

7.8.3 Resistances derived from computer simulations validated by physical

testing .................................................................................................................................... 26

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SIST EN ISO 19902:2021
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7.8.4 Resistances derived from computer simulations validated against

design formulae ................................................................................................................. 26

7.8.5 Resistances derived from unvalidated computer simulations ........................ 26

7.9 Strength and stability checks ........................................................................................................ 26

7.9.1 Action and resistance factors ....................................................................................... 26

7.9.2 Strength and stability equations ................................................................................. 26

7.9.3 Unfactored actions ........................................................................................................... 27

7.10 Robustness ........................................................................................................................................... 27

7.10.1 General ................................................................................................................................. 27

7.10.2 Damage tolerance ............................................................................................................. 27

7.11 Reserve strength ................................................................................................................................ 28

7.11.1 New structures ................................................................................................................... 28

7.11.2 Existing structures ........................................................................................................... 29

7.12 Indirect actions ................................................................................................................................... 29

7.13 Structural reliability analysis........................................................................................................ 29

8 Actions for pre-service and removal situations ................................................................................... 30

8.1 General .................................................................................................................................................. 30

8.1.1 Coverage ............................................................................................................................... 30

8.1.2 Design situations ............................................................................................................... 30

8.1.3 Actions .................................................................................................................................. 30

8.2 General requirements ...................................................................................................................... 31

8.2.1 Weight control ................................................................................................................... 31

8.2.2 Dynamic effects.................................................................................................................. 31

8.2.3 Action effects ...................................................................................................................... 31

8.3 Onshore lifting .................................................................................................................................... 33

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

8.3.2 Dynamic effects.................................................................................................................. 33

8.3.3 Effect of tolerances ........................................................................................................... 34

8.3.4 Multi-crane lift ................................................................................................................... 34

8.3.5 Local factor .......................................................................................................................... 34

8.3.6 Member and joint strengths .......................................................................................... 35

8.3.7 Lifting attachments .......................................................................................................... 35

8.3.8 Slings, shackles and fittings .......................................................................................... 36

8.4 Fabrication ........................................................................................................................................... 36

8.5 Loadout .................................................................................................................................................. 36

8.5.1 Direct lift .............................................................................................................................. 36

8.5.2 Horizontal movement onto vessel .............................................................................. 36

8.5.3 Self-floating structures ................................................................................................... 37

8.6 Transportation ................................................................................................................................... 37

8.6.1 General ................................................................................................................................. 37

8.6.2 Metocean conditions ........................................................................................................ 37

8.6.3 Determination of actions ............................................................................................... 37

8.6.4 Other considerations ....................................................................................................... 38

8.7 Installation ........................................................................................................................................... 38

8.7.1 Lifted structures ................................................................................................................ 38

8.7.2 Launched structures ........................................................................................................ 38

8.7.3 Crane assisted uprighting of structures ................................................................... 38

8.7.4 Submergence pressures ................................................................................................. 38

8.7.5 Member flooding ............................................................................................................... 39

8.7.6 Actions on the foundation during installation ....................................................... 39

9 Actions for in-place situations .................................................................................................................... 39

9.1 General .................................................................................................................................................. 39

9.2 Permanent actions (G) and variable actions (Q) .................................................................... 40

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9.2.1 Permanent action 1, G ................................................................................................... 40

9.2.2 Permanent action 2, G ................................................................................................... 40

9.2.3 Variable action 1, Q ........................................................................................................ 40

9.2.4 Variable action 2, Q ........................................................................................................ 41

9.2.5 Unintentional flooding .................................................................................................... 41

9.2.6 Position and range of permanent and variable actions ...................................... 41

9.2.7 Carry down factors............................................................................................................ 41

9.2.8 Representation of actions from topsides .................................................................. 41

9.2.9 Weight control .................................................................................................................... 41

9.3 Extreme metocean actions .............................................................................................................. 42

9.3.1 General .................................................................................................................................. 42

9.3.2 Notation ................................................................................................................................ 42

9.4 Extreme quasi-static action due to wind, waves and current (E ) ................................... 42

9.4.1 Procedure for determining E ...................................................................................... 42

9.4.2 Direction of extreme wind, waves and current ...................................................... 43

9.4.3 Extreme global actions .................................................................................................... 44

9.4.4 Extreme local actions and action effects ................................................................... 44

9.4.5 Vortex induced vibrations (VIV) .................................................................................. 45

9.5 Extreme quasi-static action caused by waves only (E ) or by waves and

currents (E ) ................................................................................................................................... 45

wce

9.5.1 Procedure for determining E and E ............................................................... 45

we wce

9.5.2 Models for hydrodynamic actions ............................................................................... 46

9.5.3 Hydrodynamic models for appurtenances .............................................................. 50

9.6 Actions caused by current ............................................................................................................... 50

9.7 Actions caused by wind .................................................................................................................... 51

9.7.1 General .................................................................................................................................. 51

9.7.2 Determining actions caused by wind ......................................................................... 51

9.7.3 Wind actions determined from models .................................................................... 52

9.8 Equivalent quasi-static action representing dynamic response caused by

extreme wave conditions ................................................................................................................ 52

9.8.1 General .................................................................................................................................. 52

9.8.2 Equivalent quasi-static action (D ) representing the dynamic response ..... 53

9.8.3 Global dynamic analysis in waves ............................................................................... 53

9.9 Factored actions ................................................................................................................................. 55

9.9.1 General .................................................................................................................................. 55

9.9.2 Factored permanent and variable actions ............................................................... 55

9.9.3 Factored extreme metocean action ............................................................................ 55

9.10 Design situations ................................................................................................................................ 56

9.10.1 General considerations on the ultimate limit state .............................................. 56

9.10.2 Demonstrating sufficient RSR under metocean actions ...................................... 56

9.10.3 Partial factor design format .......................................................................................... 57

9.11 Local hydrodynamic actions .......................................................................................................... 58

10 Accidental and abnormal situations ......................................................................................................... 59

10.1 General ................................................................................................................................................... 59

10.1.1 Treatment of ALS events ................................................................................................. 59

10.1.2 Accidental events .............................................................................................................. 60

10.1.3 Abnormal environmental events ................................................................................. 60

10.2 Vessel collisions .................................................................................................................................. 60

10.2.1 General .................................................................................................................................. 60

10.2.2 Collision events .................................................................................................................. 61

10.2.3 Collision process ................................................................................................................ 61

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10.3 Dropped objects ................................................................................................................................. 61

10.4 Fires and explosions ......................................................................................................................... 62

10.5 Abnormal environmental actions ................................................................................................ 62

10.6 Assessment of structures following damage ........................................................................... 63

11 Seismic design considerations ................................................................................................................... 63

11.1 General .................................................................................................................................................. 63

11.2 Seismic design procedure ............................................................................................................... 63

11.3 Seismic reserve capacity factor .................................................................................................... 64

11.4 Recommendations for ductile design ......................................................................................... 64

11.5 ELE requirements .............................................................................................................................. 66

11.5.1 Partial action factors ....................................................................................................... 66

11.5.2 ELE structural and foundation modelling ................................................................ 66

11.6 ALE requirements .............................................................................................................................. 67

11.6.1 General ................................................................................................................................. 67

11.6.2 ALE structural and foundation modelling................................................................ 68

11.6.3 Non-linear static pushover analysis ........................................................................... 68

11.6.4 Time-history analysis ...................................................................................................... 70

12 Structural modelling and analysis ............................................................................................................ 70

12.1 Purpose of analysis ........................................................................................................................... 70

12.2 Analysis principles ............
...

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