Petroleum and natural gas industries — Arctic offshore structures

This document specifies requirements and provides recommendations and guidance for the design, construction, transportation, installation and decommissioning of offshore structures related to the activities of the petroleum and natural gas industries in arctic and cold regions. Reference to arctic and cold regions in this document is deemed to include both the Arctic and other locations characterized by low ambient temperatures and the presence or possibility of sea ice, icebergs, icing conditions, persistent snow cover, and/or permafrost. The objective of this document is to ensure that complete structures, including substructures, topsides structures, floating production vessel hulls, foundations and mooring systems, in arctic and cold regions provide an appropriate level of reliability with respect to personnel safety, environmental protection and asset value. Value includes value to the owner, to the industry and to society in general. This document does not contain requirements for the operation, maintenance, service-life inspection or repair of arctic and cold region offshore structures, unless the design strategy imposes specific requirements such as ice management (IM) to reduce ice actions. Provisions for the operation, maintenance, service‐life inspection and repair of mobile units are given in ISO 19905-1 and ISO 19905-3, supplemented by the provisions relating to ice actions and IM in this document. This document does not apply to mechanical, process and electrical equipment or any specialized process equipment associated with arctic and cold region offshore operations except in so far as it is necessary for the structure to sustain safely the actions imposed by the installation, housing and operation of such equipment. This document applies to equipment used for the positioning and disconnection of floating structures (see Clause 13).

Industries du pétrole et du gaz naturel — Structures arctiques en mer

General Information

Status

Published

Publication Date

11-Jul-2019

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 8 - Offshore Arctic structures

Current Stage

9020 - International Standard under periodical review

Start Date

15-Jul-2024

Completion Date

15-Jul-2024

Ref Project

Relations

Consolidates

ISO 23560:2008 - Woven polypropylene sacks for bulk packaging of foodstuffs

Effective Date

06-Jun-2022

Revises

ISO 19906:2010 - Petroleum and natural gas industries — Arctic offshore structures

Effective Date

07-Dec-2013

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ISO 19906:2019 - Petroleum and natural gas industries -- Arctic offshore structures

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ISO 19906:2019 - Petroleum and natural gas industries -- Arctic offshore structures

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ISO 19906:2019 - Petroleum and...

INTERNATIONAL ISO
STANDARD 19906
Second edition
2019-07
Petroleum and natural gas
industries — Arctic offshore
structures
Industries du pétrole et du gaz naturel — Structures arctiques en mer
Reference number
©
ISO 2019
© ISO 2019
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
Fax: +41 22 749 09 47
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii © ISO 2019 – All rights reserved

Contents Page
Foreword . x
Introduction . xi
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 2
4 Symbols and abbreviated terms . 10
4.1 Symbols . 10
4.2 Abbreviated terms . 10
5 General requirements and conditions . 12
5.1 Fundamental requirements . 12
5.2 Design methods . 12
5.3 Site-specific considerations . 13
5.4 Construction, transportation and installation . 15
5.5 Operational measures . 16
5.6 Environmental protection . 16
5.7 Serviceability requirements including vibration . 17
5.8 Decommissioning and reclamation . 17
6 Physical environmental conditions . 17
6.1 General . 17
6.1.1   Physical environment requirements . 17
6.1.2   Physical environmental data monitoring programmes . 18
6.2 Daylight hours . 18
6.3 Meteorology . 18
6.3.1   Air temperature . 18
6.3.2   Wind . 19
6.3.3   Wind chill . 19
6.3.4   Snow . 19
6.3.5   Ice accretion . 19
6.3.6   Visibility . 20
6.3.7   Polar lows . 20
6.4 Oceanography . 20
6.4.1   Water depth . 20
6.4.2   Waves . 20
6.4.3   Ocean currents . 20
6.4.4   Other oceanographic factors . 21
6.5 Sea ice and icebergs . 21
6.5.1   General . 21
6.5.2   Ice types . 22
6.5.3   Ice morphology . 22
6.5.4   Ice movement . 22
6.5.5   Ice properties . 23
6.5.6   Ice monitoring . 23
6.6 Seabed considerations . 23
6.6.1   Earthquakes . 23
6.6.2   Permafrost . 23
6.6.3   Ice gouge . 23
6.6.4   Strudel scours . 23
7 Reliability and limit states design . 24
7.1 Design philosophy . 24
7.1.1   Governing principles . 24
7.1.2   Life-safety categories . 24
7.1.3   Consequence categories . 24
7.1.4   Exposure levels . 25
7.1.5   Safety and reliability . 25
7.1.6   Limit states . 25
7.1.7   Alternative design methods . 25
7.2 Limit states design method . 26
7.2.1   Limit states . 26
7.2.2   Actions . 28
7.2.3   Principal and companion environmental actions . 29
7.2.4   Combinations of actions and partial action factors . 31
8 Events and actions . 33
8.1 General . 33
8.2 Ice events and actions . 33
8.2.1   General principles for calculating ice actions . 33
8.2.2   Representative values of ice actions . 34
8.2.3   Ice events and design situations . 34
8.2.4   Global ice actions . 35
8.2.5   Local ice actions. 37
8.2.6   Dynamic ice actions . 37
8.2.7   Operational measures to reduce ice actions . 38
8.2.8   Physical and mechanical properties of ice . 38
8.3 Metocean related actions . 39
8.3.1   Metocean actions on structures . 39
8.3.2   Wave-induced velocity of ice features . 41
8.4 Seismic actions . 41
8.4.1   General . 41
8.4.2   Companion seismic actions . 42
8.4.3   Companion ice actions . 42
8.4.4   Factors influencing seismic actions and effects . 42
8.4.5   Seismic isolation and damping systems . 42
9 Foundation design . 42
9.1 General . 42
9.2 Geotechnical data acquisition and identification of hazards . 43
9.2.1   General . 43
9.2.2   Marine soil investigations . 44
9.2.3   Bathymetry survey . 44
9.2.4   Geophysical survey . 44
9.3 Representative values of soil properties . 44
9.4 Design considerations . 45
9.4.1   General . 45
9.4.2   Action factors . 46
9.4.3   Material and resistance factors .
...

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