EN ISO 19906:2010

SLOVENSKI STANDARD
01-januar-2012
,QGXVWULMDQDIWHLQ]HPHOMVNHJDSOLQD1DIWQHSORãþDGL]DDUNWLþQDREPRþMD,62

Petroleum and natural gas industries - Arctic offshore structures (ISO 19906:2010)
Erdöl- und Erdgasindustrie - Offshore-Bauwerke für den Arktis-Bereich (ISO
19906:2010)
Industries du pétrole et du gaz naturel - Structures arctiques en mer (ISO 19906:2010)
Ta slovenski standard je istoveten z: EN ISO 19906:2010
ICS:
75.180.10 Oprema za raziskovanje in Exploratory and extraction
odkopavanje equipment
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD
EN ISO 19906
NORME EUROPÉENNE
EUROPÄISCHE NORM
December 2010
ICS 75.180.10
English Version
Petroleum and natural gas industries - Arctic offshore structures
(ISO 19906:2010)
Industries du pétrole et du gaz naturel - Structures Erdöl- und Erdgasindustrie - Offshore-Bauwerke für den
arctiques en mer (ISO 19906:2010) Arktis-Bereich (ISO 19906:2010)
This European Standard was approved by CEN on 14 December 2010.

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, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.

EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2010 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 19906:2010: E
worldwide for CEN national Members.

Contents Page
Foreword .3

Foreword
This document (EN ISO 19906:2010) 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 AFNOR.
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 June 2011, and conflicting national standards shall be withdrawn at
the latest by June 2011.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent rights.
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, Romania, Slovakia, Slovenia, Spain,
Sweden, Switzerland and the United Kingdom.
Endorsement notice
The text of ISO 19906:2010 has been approved by CEN as a EN ISO 19906:2010 without any modification.

INTERNATIONAL ISO
STANDARD 19906
First edition
2010-12-15
Petroleum and natural gas industries —
Arctic offshore structures
Industries du pétrole et du gaz naturel — Structures arctiques en mer

Reference number
ISO 19906:2010(E)
©
ISO 2010
ISO 19906:2010(E)
PDF disclaimer
This PDF file may contain embedded typefaces. In accordance with Adobe's licensing policy, this file may be printed or viewed but
shall not be edited unless the typefaces which are embedded are licensed to and installed on the computer performing the editing. In
downloading this file, parties accept therein the responsibility of not infringing Adobe's licensing policy. The ISO Central Secretariat
accepts no liability in this area.
Adobe is a trademark of Adobe Systems Incorporated.
Details of the software products used to create this PDF file can be found in the General Info relative to the file; the PDF-creation
parameters were optimized for printing. Every care has been taken to ensure that the file is suitable for use by ISO member bodies. In
the unlikely event that a problem relating to it is found, please inform the Central Secretariat at the address given below.

©  ISO 2010
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means,
electronic or mechanical, including photocopying and microfilm, without permission in writing from either ISO at the address below or
ISO's member body in the country of the requester.
ISO copyright office
Case postale 56 • CH-1211 Geneva 20
Tel. + 41 22 749 01 11
Fax + 41 22 749 09 47
E-mail copyright@iso.org
Web www.iso.org
Published in Switzerland
ii © ISO 2010 – All rights reserved

ISO 19906:2010(E)
Contents Page
Foreword .vi
Introduction.vii
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.11
5.1 Fundamental requirements .11
5.2 Design methods.12
5.3 Site-specific considerations.12
5.4 Construction, transportation and installation .13
5.5 Design considerations.13
5.6 Environmental protection.14
5.7 Vibrations and crew comfort.14
6 Physical environmental conditions .14
6.1 General .14
6.2 Daylight hours .15
6.3 Meteorology .15
6.4 Oceanography .16
6.5 Sea ice and icebergs.17
6.6 Seabed considerations .18
7 Reliability and limit states design.19
7.1 Design philosophy .19
7.2 Limit states design method.21
8 Actions and action effects.26
8.1 General .26
8.2 Ice actions .26
8.3 Metocean related actions.31
8.4 Seismic actions .32
9 Foundation design .33
9.1 General .33
9.2 Site investigation.34
9.3 Characteristic material properties .36
9.4 Design considerations.37
9.5 Gravity base structures .40
9.6 Piled structures .42
9.7 Floating structures .43
9.8 Scour.44
9.9 Inspection and performance monitoring .45
9.10 Seismic analysis.45
10 Man-made islands .45
10.1 General .45
10.2 Island types.45
10.3 Design considerations.47
10.4 Seismic design .52
ISO 19906:2010(E)
10.5 Construction.53
10.6 Monitoring and maintenance.53
10.7 Decommissioning and reclamation .54
11 Fixed steel structures.54
11.1 General.54
11.2 General design requirements.55
11.3 Structural modelling and analysis .55
11.4 Strength of tubular members and joints .56
11.5 Strength of stiffened-plate panels.56
11.6 Strength of steel-concrete composite walls .56
11.7 Seismic design.58
11.8 Fatigue .59
11.9 Materials, testing and NDT.59
11.10 Corrosion and abrasion protection.60
11.11 Welding .60
12 Fixed concrete structures.60
12.1 General requirements.60
12.2 Actions and action effects .61
12.3 Structural analysis.61
12.4 Concrete works.63
12.5 Mechanical systems .69
12.6 Marine operations and construction afloat.70
12.7 Corrosion control.70
12.8 Inspection and condition monitoring .70
13 Floating structures .71
13.1 General.71
13.2 General design methodology .71
13.3 Environment.73
13.4 Actions.73
13.5 Hull integrity.75
13.6 Hull stability.76
13.7 Stationkeeping .77
13.8 Mechanical systems .79
13.9 Operations .82
14 Subsea production systems.84
14.1 General.84
14.2 Ice and seabed considerations .85
14.3 Actions on subsea production systems .87
14.4 Seismic design.89
14.5 Risk reduction.89
15 Topsides .90
15.1 Overall considerations .90
15.2 Design and operational requirements .93
15.3 Seismic design.101
16 Other ice engineering topics .102
16.1 Ice roads and supplies over ice .102
16.2 Artificial ice islands .104
16.3 Protection barriers.105
16.4 Measurements of ice pressure and actions.107
16.5 Ice tank modelling.108
16.6 Offloading in ice.109
17 Ice management.110
17.1 General.110
17.2 Ice management system .111
17.3 Ice management system capabilities .112
17.4 Ice management planning and operations.113
iv © ISO 2010 – All rights reserved

ISO 19906:2010(E)
18 Escape, evacuation and rescue .114
18.1 General .114
18.2 EER philosophy .115
18.3 EER strategy .115
18.4 Environment.115
18.5 Hazard and risk analysis.116
18.6 Continuous assessment.117
18.7 EER system design .117
18.8 Emergency response organization.117
18.9 Competency assurance .118
18.10 Communications and alarms .118
18.11 Personal protective equipment.118
18.12 Man overboard recovery.118
18.13 Escape design .119
18.14 Evacuation design.119
18.15 Rescue design .120
Annex A (informative) Additional information and guidance .121
Annex B (informative) Regional information.331
Bibliography.444

ISO 19906:2010(E)
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.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.
The main task of technical committees is to prepare International Standards. Draft International Standards
adopted by the technical committees are circulated to the member bodies for voting. Publication as an
International Standard requires approval by at least 75 % of the member bodies casting a vote.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. ISO shall not be held responsible for identifying any or all such patent rights.
ISO 19906 was prepared by Technical Committee ISO/TC 67, Materials, equipment and offshore structures
for petroleum, petrochemical and natural gas industries, Subcommittee SC 7, Offshore structures.
ISO 19906 is one of a series of International Standards for offshore structures. The full series consists of the
following International Standards.
⎯ ISO 19900, Petroleum and natural gas industries — General requirements for offshore structures
⎯ ISO 19901 (all parts), Petroleum and natural gas industries — Specific requirements for offshore
1)
structures
⎯ ISO 19902, Petroleum and natural gas industries — Fixed steel offshore structures
⎯ ISO 19903, Petroleum and natural gas industries — Fixed concrete offshore structures
⎯ ISO 19904-1, Petroleum and natural gas industries — Floating offshore structures — Part 1: Monohulls,
semi-submersibles and spars
⎯ ISO 19905 (all parts), Petroleum and natural gas industries — Site-specific assessment of mobile
2)
offshore units
⎯ ISO 19906, Petroleum and natural gas industries — Arctic offshore structures

1) ISO 19901-3, Topsides structure, to be published.
2) All parts are under preparation.
vi © ISO 2010 – All rights reserved

ISO 19906:2010(E)
Introduction
The series of International Standards ISO 19900 to ISO 19906 addresses design requirements and
assessments for all offshore structures used by the petroleum and natural gas industries worldwide. Through
their application, the intention is to achieve reliability levels appropriate for manned and unmanned offshore
structures, regardless of the type of structure and the nature or combination of the materials used.
It is important to recognize that structural integrity is an overall concept comprising models for describing
actions, structural analyses, design rules, safety elements, workmanship, quality control procedures and
national requirements, all of which are mutually dependent. The modification of one aspect of design in
isolation can disturb the balance of reliability inherent in the overall concept or structural system. The
implications involved in modifications, therefore, need to be considered in relation to the overall reliability of all
offshore structural systems.
The series of International Standards applicable to the various types of offshore structure is intended to
provide wide latitude in the choice of structural configurations, materials and techniques without hindering
innovation. Sound engineering judgment is, therefore, necessary in the use of these International Standards.
This International Standard was developed in response to the offshore industry's demand for a coherent and
consistent definition of methodologies to design, analyse and assess arctic and cold region offshore structures
of the class described in Clause 1.
Structures capable of resisting ice have been in use in temperate regions for well over a century. These
include bridge piers and navigation aids in ice-covered rivers and estuaries. In fact, bridge codes in cold
countries have included methods for ice loads dating back many decades. In more severe arctic and cold
regions, ice resistant structures are more recent. But much experience has been gained commencing in the
1960s, and this knowledge is incorporated into this International Standard. Where uncertainties still exist,
conservative approaches and methods have been recommended.
This International Standard also addresses issues such as topsides winterization, and escape, evacuation and
rescue that go beyond what is strictly necessary for the design, construction, transportation, installation and
decommissioning of the structure. These issues are essential for offshore operations in arctic and cold region
conditions and they are not covered in other International Standards. When future editions of ISO 19906 and
other International Standards are prepared, efforts will be made to avoid duplication of scope.
Annex A provides background to and guidance on the use of this International Standard and it is intended that
it be read in conjunction with the main body of this International Standard. The clause numbering in Annex A
is the same as in the normative text to facilitate cross-referencing.
Annex B provides regional information on the physical environment of specific offshore areas in arctic and
cold regions.
To meet certain needs of industry for linking software to specific elements in this International Standard, a
special numbering system has been permitted for figures, tables, equations and bibliographic references.

INTERNATIONAL STANDARD ISO 19906:2010(E)

Petroleum and natural gas industries — Arctic offshore
structures
1 Scope
This International Standard specifies requirements and provides recommendations and guidance for the
design, construction, transportation, installation and removal 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
International Standard is deemed to include both the Arctic and other cold regions that are subject to similar
sea ice, iceberg and icing conditions. The objective of this International Standard is to ensure that offshore
structures in arctic and cold regions provide an appropriate level of reliability with respect to personnel safety,
environmental protection and asset value to the owner, to the industry and to society in general.
This International Standard does not contain requirements for the operation, maintenance, service-life
inspection or repair of arctic and cold region offshore structures, except where the design strategy imposes
specific requirements (e.g. 17.2.2).
While this International Standard does not apply specifically to mobile offshore drilling units (see ISO 19905-1),
the procedures relating to ice actions and ice management contained herein are applicable to the assessment
of such units.
This International Standard 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.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated
references, only the edition cited applies. For undated references, the latest edition of the referenced
document (including any amendments) applies.
ISO 19900, Petroleum and natural gas industries — General requirements for offshore structures
ISO 19901-1, Petroleum and natural gas industries — Specific requirements for offshore structures — Part 1:
Metocean design and operating considerations
ISO 19901-2, Petroleum and natural gas industries — Specific requirements for offshore structures — Part 2:
Seismic design procedures and criteria
ISO 19901-3, Petroleum and natural gas industries — Specific requirements for offshore structures — Part 3:
3)
Topsides structure
ISO 19901-4, Petroleum and natural gas industries — Specific requirements for offshore structures — Part 4:
Geotechnical and foundation design considerations

3) To be published.
ISO 19906:2010(E)
ISO 19901-6, Petroleum and natural gas industries — Specific requirements for offshore structures — Part 6:
Marine operations
ISO 19901-7, Petroleum and natural gas industries — Specific requirements for offshore structures — Part 7:
Stationkeeping systems for floating offshore structures and mobile offshore units
ISO 19902, Petroleum and natural gas industries — Fixed steel offshore structures
ISO 19903, Petroleum and natural gas industries — Fixed concrete offshore structures
ISO 19904-1, Petroleum and natural gas industries — Floating offshore structures — Part 1: Monohulls,
semi-submersibles and spars
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 19900, ISO 19901-1, ISO 19901-2
and ISO 19901-4 and the following apply.
3.1
abrasion
effect of ice grinding against the surface of a structure removing paint, surface protrusions and coatings,
oxidized material, or concrete particles and aggregate
3.2
accidental situation
exceptional condition of use or exposure for the structure
NOTE Exceptional conditions include fire, explosion, impact or local failure.
3.3
action
external load applied to the structure (direct action) or an imposed deformation or acceleration (indirect action)
3.4
action combination
design values of the different actions considered simultaneously in the verification of a specific limit state
3.5
action effect
effect of actions on the structure or its components
3.6
adfreeze
freezing of ice to the surface of a structure
3.7
alert
prescribed reaction to specific ice conditions, which in time can become hazardous to the operation of a
structure
NOTE Several different levels associated with the time proximity of the hazard are normally recognized.
3.8
aspect ratio
ratio of structure diameter or width to ice thickness
2 © ISO 2010 – All rights reserved

ISO 19906:2010(E)
3.9
broken ice
loose ice consisting of small floes, broken up as a result of natural processes, or active or passive intervention
3.10
characteristic value
value assigned to a basic variable associated with a prescribed probability of being exceeded by unfavourable
values during some reference period
NOTE For actions, the characteristic value is the main representative value. In some design situations, a variable can
have two characteristic values, an upper and a lower value.
3.11
companion environmental action
environmental action applied simultaneously with the principal environmental action
3.12
consequence category
classification system for identifying the environmental, economic and indirect personnel safety consequences
of failure of a platform
NOTE For offshore structures, three consequence categories are defined; see 7.1.3:
⎯ C1: high consequences;
⎯ C2: medium consequences;
⎯ C3: low consequences.
3.13
consolidation
process of freezing of pore water in voids within ice rubble, between floes, or between soil particles
NOTE For soils, this involves drainage of pore fluid as a result of overburden pressures.
3.14
consolidated layer
portion of an ice ridge keel, rubble pile, rubble field or stamukha below the waterline formed by the ice
consolidation process
3.15
design action
action combination resulting from factored representative actions associated with an AL or EL event
3.16
design resistance
resistance calculated from factored characteristic material properties or from factored resistance based on
unfactored characteristic material properties
3.17
design service life
assumed period for which a structure or a structural component will be used for its intended purpose with
anticipated maintenance but without substantial repair being necessary
3.18
design value
value derived from the representative value for use in the design verification procedure
ISO 19906:2010(E)
3.19
disconnection
planned separation of the risers (and mooring, if applicable) from a floating structure
3.20
ductility
ability of a material to deform and absorb energy beyond its elastic limit or ability of a component to sustain
load beyond yield
NOTE See also system ductility (3.79).
3.21
dynamic action
action that induces acceleration of a structure or a structural component of a magnitude sufficient to require
specific consideration
3.22
dynamic positioning
technique of automatically maintaining the position of a floating vessel within a specified tolerance by
controlling onboard thrusters to counter the wind, wave, current and ice actions
3.23
emergency disconnection
planned separation of the risers (and mooring, if applicable) from a floating structure, without depressurization
of the risers
3.24
escape
act of personnel moving away from a hazardous event to a place on the installation where its effects are
reduced or removed
3.25
evacuation
planned precautionary and emergency method of moving personnel from the installation (muster station or
TR) to a safe distance beyond the immediate or potential hazard zone
3.26
exposure level
classification system used to define the requirements for a structure based on consideration of life-safety and
of environmental and economic consequences of failure
For offshore structures, three exposure-level categories are defined; see 7.1.4:
⎯ L1: highest exposure level;
⎯ L2: intermediate exposure level;
⎯ L3: lowest exposure level.
3.27
first-year ice
FY
sea ice formed during the current or prior winter that has not survived one summer melt season
4 © ISO 2010 – All rights reserved

ISO 19906:2010(E)
3.28
floe
relatively flat piece of sea ice greater than 20 m across
NOTE There are typically sub-categories: small (20 m to 100 m across), medium (100 m to 500 m across), big
(500 m to 2 000 m across), vast (2 km to 10 km across) and giant (greater than 10 km across).
3.29
flowline
piping on the sea floor linking one or more subsea wells to the production system
NOTE Functions may include production, injection, subsea systems control and export of produced fluids.
3.30 Freeboard
3.30.1
freeboard
vertical distance from the water surface to the top of the ice
3.30.2
freeboard
vertical distance from the mean water surface at a given draught to the deck level, measured at the lowest
point where water can enter the structure or ship
3.31
freeze-thaw
possible degrading effect on concrete of repeated temperature changes causing frost cycles at the surface
3.32
glory hole
man-made areal excavation in the seabed used to protect a subsea installation or its components from ice
damage
3.33
ice alert
alert related to encroaching hazardous ice features or conditions, generally requiring specific changes to
production operations
3.34
iceberg
glacial or shelf ice (greater than 5 m freeboard) that has broken (calved) away from its source
NOTE Icebergs can be freely floating or grounded, and are sometimes defined as tabular, dome, pinnacle, wedge or
block shaped.
3.35
ice detection
discrimination of ice features or associated conditions from the surrounding environment
3.36
ice gouge
ice scour
incision made by an ice feature in the seabed, having the form of either an areal incision (i.e. pit) or a linear
incision (i.e. furrow)
3.37
ice island
large tabular shaped ice feature that has calved from an ice shelf or glacier
ISO 19906:2010(E)
3.38
ice management
active processes used to alter the ice environment with the intent of reducing the frequency, severity or
uncertainty of ice actions
3.39
ice management plan
detailed plan outlining the objectives, active procedures involved and individual responsibilities for the
implementation of the ice management system
3.40
ice management system
ice management, and associated ice detection and threat evaluation tools used for its implementation
3.41
ice ridge
linear feature formed of ice blocks created by the relative motion between ice sheets
NOTE A pressure ice ridge is formed when ice sheets are pushed together and a shear ice ridge is formed when ice
sheets slide along a common boundary.
3.42
ice scenario
combination of circumstances involving the presence of ice, resulting in actions or action combinations on a
structure
3.43
infill
material deposited in an ice gouge, excavation or trench through natural processes
3.44
landfast ice
fast ice
ice that remains attached to a shoreline, island or grounded ice feature
3.45
level ice
sheet ice
region of ice with relatively uniform thickness
3.46
life-safety category
classification system for identifying the applicable level of life-safety for a platform
NOTE For offshore structures, three life-safety categories are defined; see 7.1.2:
⎯ S1: manned non-evacuated;
⎯ S2: manned evacuated;
⎯ S3: unmanned.
3.47
local failure
localized damage to the structure with the potential for escalating to partial or complete failure
6 © ISO 2010 – All rights reserved

ISO 19906:2010(E)
3.48
lowest anticipated service temperature
LAST
minimum hourly average extreme-level (EL) air temperature
NOTE The EL temperature is described in 7.2.2.6.
3.49
mat
man-made weighted sheet used for the stabilization of soils or subsea components
3.50
material factor
partial safety factor applied to the characteristic value of a material property
3.51
multi-year ice
MYI
MY
sea ice that has survived at least one summer melt season
NOTE When the term “multi-year ice” is used in conjunction with the term “second-year ice”, the former should be
interpreted as ice that has survived at least two summer melt seasons.
3.52
offshore installation manager
OIM
person responsible for the installation and all operations on and around a structure
3.53
owner
representative of the company or companies that own, hold a licence for or hold a lease for the development
3.54
pack ice
sea ice consisting of discrete floes that is
...