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ISO

ISO 19902:2020

(Main)

Petroleum and natural gas industries — Fixed steel offshore structures

Petroleum and natural gas industries — Fixed steel offshore structures

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.

Industries du pétrole et du gaz naturel — Structures en mer fixes en acier

Le présent document spécifie des exigences et fournit des recommandations applicables aux types suivants de structures en mer fixes en acier pour les industries du pétrole et du gaz naturel : — caissons, autoportants et ancrés ; — jaquettes ; — tours mono ; — tours. En outre, elle est applicable à des structures élastiques prenant appui sur le fond marin, à des structures en acier posées par gravité, à des plateformes auto-élévatrices, à d'autres structures prenant appui sur le fond marin et à d'autres structures associées aux structures en mer (telles que des citernes sous-marines de stockage de pétrole, des ponts et des structures de joint). Le présent document contient des exigences pour la planification et l'ingénierie de la conception, de la fabrication, du transport et de l'installation de nouvelles structures de même que, le cas échéant, de leur enlèvement futur. NOTE 1 Des exigences spécifiques concernant la conception de structures en mer fixes en acier dans les environnements arctiques sont présentées dans l'ISO 19906.

General Information

Status
Published
Publication Date
11-Nov-2020
ICS
75.180.10 - Exploratory, drilling and extraction equipment
Technical Committee
ISO/TC 67/SC 7 - Offshore structures
Drafting Committee
ISO/TC 67/SC 7/WG 3 - Fixed steel structures
Current Stage
6060 - International Standard published
Start Date
12-Nov-2020
Due Date
12-Nov-2020
Completion Date
12-Nov-2020
Ref Project

Relations

Consolidates
ISO 3547-6:2007 - Plain bearings — Wrapped bushes — Part 6: Checking the inside diameter
Effective Date
06-Jun-2022
Revises
ISO 19902:2007 - Petroleum and natural gas industries — Fixed steel offshore structures
Effective Date
28-Dec-2013
Revises
ISO 19902:2007/Amd 1:2013 - Petroleum and natural gas industries — Fixed steel offshore structures — Amendment 1
Effective Date
28-Dec-2013

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ISO 19902:2020 - Petroleum and natural gas industries -- Fixed steel offshore structuresISO 19902:2020 - Petroleum and natural gas industries -- Fixed steel offshore structures
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ISO 19902:2020 - Petroleum and natural gas industries -- Fixed steel offshore structures
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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 2020
© 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

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
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 .
...

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