EN ISO 19901-3:2010

SLOVENSKI STANDARD
01-januar-2012
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Petroleum and natural gas industries - Specific requirements for offshore structures -
Part 3: Topsides structure (ISO 19901-3:2010)
Erdöl- und Erdgasindustrie - Spezielle Anforderungen an Offshore-Anlagen - Teil 3:
Topsides structure (ISO 19901-3:2010)
Industries du pétrole et du gaz naturel - Exigences spécifiques relatives aux structures
en mer - Partie 3: Superstructures (ISO 19901-3:2010)
Ta slovenski standard je istoveten z: EN ISO 19901-3:2010
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 19901-3
NORME EUROPÉENNE
EUROPÄISCHE NORM
December 2010
ICS 75.180.10
English Version
Petroleum and natural gas industries - Specific requirements for
offshore structures - Part 3: Topsides structure (ISO 19901-
3:2010)
Industries du pétrole et du gaz naturel - Exigences Erdöl- und Erdgasindustrie - Spezielle Anforderungen an
spécifiques aux structures en mer - Partie 3: Offshore-Anlagen - Teil 3: Topsides structure (ISO 19901-
Superstructures (ISO 19901-3:2010) 3:2010)
This European Standard was approved by CEN on 20 November 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 19901-3:2010: E
worldwide for CEN national Members.

Contents Page
Foreword .3

Foreword
This document (EN ISO 19901-3:2010) 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 19901-3:2010 has been approved by CEN as a EN ISO 19901-3:2010 without any
modification.
INTERNATIONAL ISO
STANDARD 19901-3
First edition
2010-12-15
Petroleum and natural gas industries —
Specific requirements for offshore
structures —
Part 3:
Topsides structure
Industries du pétrole et du gaz naturel — Exigences spécifiques aux
structures en mer —
Partie 3: Superstructures
Reference number
ISO 19901-3:2010(E)
©
ISO 2010
.
ISO 19901-3:2010(E)
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ii © ISO 2010 – All rights reserved

ISO 19901-3:2010(E)
Contents Page
Foreword .vi
Introduction.viii
1 Scope.1
2 Normative references.2
3 Terms and definitions .3
4 Symbols and abbreviated terms .7
4.1 Symbols.7
4.2 Abbreviated terms.8
5 Overall considerations.9
5.1 Design situations.9
5.2 Codes and standards.9
5.3 Deck elevation and green water.10
5.4 Exposure level .10
5.5 Operational considerations.11
5.6 Selecting the design environmental conditions .11
5.7 Assessment of existing topsides structures.11
5.8 Reuse of topsides structure.11
5.9 Modifications and refurbishment.11
6 Design requirements.11
6.1 General .11
6.2 Materials selection .12
6.3 Design conditions .12
6.4 Structural interfaces.12
6.5 Design for serviceability limit states (SLS).12
6.6 Design for ultimate limit states (ULS) .14
6.7 Design for fatigue limit states (FLS).15
6.8 Design for accidental limit states (ALS).15
6.9 Robustness .15
6.10 Corrosion control .16
6.11 Design for fabrication and inspection.16
6.12 Design considerations for structural integrity management.17
6.13 Design for decommissioning, removal and disposal.17
7 Actions.17
7.1 General .17
7.2 In-place actions .18
7.3 Action factors .19
7.4 Vortex-induced vibrations .21
7.5 Deformations .21
7.6 Wave and current actions.21
7.7 Wind actions .22
7.8 Seismic actions .22
7.9 Actions during fabrication and installation .23
7.10 Accidental situations .23
7.11 Other actions .33
8 Strength and resistance of structural components.34
8.1 Use of local building standards .34
8.2 Cylindrical tubular member design .35
8.3 Design of non-cylindrical sections.35
ISO 19901-3:2010(E)
8.4 Connections . 36
8.5 Castings. 37
9 Structural systems . 37
9.1 Topsides design. 37
9.2 Topsides structure design models . 38
9.3 Support structure interface . 39
9.4 Flare towers, booms, vents and similar structures. 39
9.5 Helicopter landing facilities (helidecks) . 40
9.6 Crane support structure. 43
9.7 Derrick design. 45
9.8 Bridges. 46
9.9 Bridge bearings. 46
9.10 Anti-vibration mountings for modules and major equipment skids . 46
9.11 System interface assumptions. 47
9.12 Fire protection systems . 47
9.13 Penetrations . 47
9.14 Difficult-to-inspect areas. 48
9.15 Drainage. 48
9.16 Actions due to drilling operations . 48
9.17 Strength reduction due to heat . 48
9.18 Walkways, laydown areas and equipment maintenance. 48
9.19 Muster areas and lifeboat stations. 48
10 Materials . 49
10.1 General. 49
10.2 Carbon steel . 49
10.3 Stainless steel. 52
10.4 Aluminium alloys . 52
10.5 Fibre-reinforced composites . 53
10.6 Timber . 54
11 Fabrication, quality control, quality assurance and documentation. 54
11.1 Assembly. 54
11.2 Welding. 55
11.3 Fabrication inspection . 55
11.4 Quality control, quality assurance and documentation. 55
11.5 Corrosion protection . 55
12 Corrosion control. 56
12.1 General. 56
12.2 Forms of corrosion, associated corrosion rates and corrosion damage. 56
12.3 Design of corrosion control. 56
12.4 Fabrication and installation of corrosion control. 57
12.5 In-service inspection, monitoring and maintenance of corrosion control . 58
13 Loadout, transportation and installation. 58
14 In-service inspection and structural integrity management . 59
14.1 General. 59
14.2 Particular considerations applying to topsides structures. 59
14.3 Topsides structure default inspection scopes. 59
15 Assessment of existing topsides structures. 61
16 Reuse of topsides structure . 61
Annex A (informative) Additional information and guidance . 62
A.1 Scope . 62
A.2 Normative references . 62
A.3 Terms and definitions . 62
A.4 Symbols and abbreviated terms . 62
iv © ISO 2010 – All rights reserved

ISO 19901-3:2010(E)
A.5 Overall considerations.62
A.6 Design requirements.63
A.7 Actions.67
A.8 Strength and resistance of structural components.93
A.9 Structural systems .95
A.10 Materials .100
A.11 Fabrication, quality control, quality assurance and documentation .101
A.12 Corrosion control .102
A.13 Loadout, transportation and installation .102
A.14 In-service inspection and structural integrity management.103
A.15 Assessment of existing topsides structures.104
A.16 Reuse of topsides structure.105
Annex B (informative) Example calculation of building code correspondence factor.106
B.1 General .106
B.2 Basic data.106
B.3 Design and utilizations to ISO 19902.107
[2]
B.4 Design and utilizations to ANSI/AISC 360-05 .109
Annex C (informative) Regional information.112
Bibliography.113

ISO 19901-3:2010(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 19901-3 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 19901 consists of the following parts, under the general title Petroleum and natural gas industries —
Specific requirements for offshore structures:
⎯ Part 1: Metocean design and operating considerations
⎯ Part 2: Seismic design procedures and criteria
⎯ Part 3: Topsides structure
⎯ Part 4: Geotechnical and foundation design considerations
⎯ Part 5: Weight control during engineering and construction
⎯ Part 6: Marine operations
⎯ Part 7: Stationkeeping systems for floating offshore structures and mobile offshore units
ISO 19901 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
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
vi © ISO 2010 – All rights reserved

ISO 19901-3:2010(E)
1)
⎯ ISO 19904-2 , Petroleum and natural gas industries — Floating offshore structures — Part 2: Tension
leg platforms
⎯ ISO 19905-1, Petroleum and natural gas industries — Site-specific assessment of mobile offshore
units — Part 1: Jack-ups
2)
⎯ ISO/TR 19905-2 , Petroleum and natural gas industries — Site-specific assessment of mobile offshore
units — Part 2: Jack-ups commentary
⎯ ISO 19906, Petroleum and natural gas industries — Arctic offshore structures

1) Under preparation.
2) Under preparation.
ISO 19901-3:2010(E)
Introduction
The series of International Standards applicable to types of offshore structure, ISO 19900 to ISO 19906,
constitutes a common basis covering those aspects that address design requirements and assessments of 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, whatever
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 types of offshore structure is intended to provide wide
latitude in the choice of structural configurations, materials and techniques, without hindering innovation.
Sound engineering judgement is therefore necessary in the use of these International Standards.
This part of ISO 19901 has been prepared for those structural components of offshore platforms which are
above the wave zone and are not part of the support structure or of the hull. Previous national and
international standards for offshore structures have concentrated on design aspects of support structures, and
the approach to the many specialized features of topsides has been variable and inconsistent, with good
practice poorly recorded.
Historically, the design of structural components in topsides has been performed to national or regional codes
for onshore structures, modified in accordance with experience within the offshore industry, or to relevant
parts of classification society rules. While this part of ISO 19901 permits use of national or regional codes, and
indeed remains dependent on them for the formulation of component resistance equations, it provides
modifications that result in a more consistent level of component safety between support structures and
topsides structures.
In some aspects, the requirements for topsides structures are the same as, or similar to, those for fixed steel
structures; in such cases, reference is made to ISO 19902, with modifications where necessary. Annex A
provides background to, and guidance on, the use of this part of ISO 19901, and is intended to be read in
conjunction with the main body of this part of ISO 19901. The clause numbering in Annex A follows the same
structure as that in the body of the normative text in order to facilitate cross-referencing.
Annex B provides an example of the use of national standards for onshore structures in conjunction with this
part of ISO 19901.
Regional information on the application of this part of ISO 19901 to certain specific offshore areas is provided
in Annex C.
In International Standards, the following verbal forms are used:
⎯ “shall” and “shall not” are used to indicate requirements strictly to be followed in order to conform to the
document and from which no deviation is permitted;
⎯ “should” and “should not” are used to indicate that, among several possibilities, one is recommended as
particularly suitable, without mentioning or excluding others, or that a certain course of action is preferred
but not necessarily required, or that (in the negative form) a certain possibility or course of action is
deprecated but not prohibited;
viii © ISO 2010 – All rights reserved

ISO 19901-3:2010(E)
⎯ “may” is used to indicate a course of action permissible within the limits of the document;
⎯ “can” and “cannot” are used for statements of possibility and capability, whether material, physical or
causal.
INTERNATIONAL STANDARD ISO 19901-3:2010(E)

Petroleum and natural gas industries — Specific requirements
for offshore structures —
Part 3:
Topsides structure
1 Scope
This part of ISO 19901 gives requirements for the design, fabrication, installation, modification and structural
integrity management for the topsides structure for an oil and gas platform. It complements ISO 19902,
ISO 19903, ISO 19904-1, ISO 19905-1 and ISO 19906, which give requirements for various forms of support
structure. Requirements in this part of ISO 19901 concerning modifications and maintenance relate only to
those aspects that are of direct relevance to the structural integrity of the topsides structure.
The actions on (structural components of) the topsides structure are derived from this part of ISO 19901,
where necessary in combination with other International Standards in the ISO 19901 series. The resistances
of structural components of the topsides structure can be determined by the use of international or national
building codes, as specified in this part of ISO 19901. If any part of the topsides structure forms part of the
primary structure of the overall structural system of the whole platform, the requirements of this part of
ISO 19901 are supplemented with applicable requirements in ISO 19902, ISO 19903, ISO 19904-1,
ISO 19905-1 and ISO 19906.
This part of ISO 19901 is applicable to the topsides of offshore structures for the petroleum and natural gas
industries, as follows:
⎯ topsides of fixed offshore structures;
⎯ discrete structural units placed on the hull structures of floating offshore structures and mobile offshore
units;
⎯ certain aspects of the topsides of arctic structures.
This part of ISO 19901 is not applicable to those parts of the superstructure of floating structures that form
part of the overall structural system of the floating structure; these parts come under the provisions of
ISO 19904-1. This part of ISO 19901 only applies to the structure of modules on a floating structure that do
not contribute to the overall integrity of the floating structural system.
This part of ISO 19901 is not applicable to the structure of hulls of mobile offshore units.
This part of ISO 19901 does not apply to those parts of floating offshore structures and mobile offshore units
that are governed by the rules of a recognized certifying authority and which are wholly within the class rules.
Some aspects of this part of ISO 19901 are also applicable to those parts of the hulls of floating offshore
structures and mobile offshore units that contain hydrocarbon processing, piping or storage.
This part of ISO 19901 contains requirements for, and guidance and information on, the following aspects of
topsides structures:
⎯ design, fabrication, installation and modification;
⎯ in-service inspection and structural integrity management;
ISO 19901-3:2010(E)
⎯ assessment of existing topsides structures;
⎯ reuse;
⎯ decommissioning, removal and disposal;
⎯ prevention, control and assessment of fire, explosions and other accidental events.
This part of ISO 19901 applies to structural components including the following:
⎯ primary and secondary structure in decks, module support frames and modules;
⎯ flare structures;
⎯ crane pedestal and other crane support arrangements;
⎯ helicopter landing decks (helidecks);
⎯ permanent bridges between separate offshore structures;
⎯ masts, towers and booms on offshore structures.
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 2631-1, Mechanical vibration and shock — Evaluation of human exposure to whole-body vibration —
Part 1: General requirements
ISO 2631-2, Mechanical vibration and shock — Evaluation of human exposure to whole-body vibration —
Part 2: Vibration in buildings (1 Hz to 80 Hz)
ISO 13702, Petroleum and natural gas industries — Control and mitigation of fires and explosions on offshore
production installations — Requirements and guidelines
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 19901-6, Petroleum and natural gas industries — Specific requirements for offshore structures —
Part 6: Marine operations
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 19905-1, Petroleum and natural gas industries — Site-specific assessment of mobile offshore units —
Part 1: Jack-ups
ISO 19906, Petroleum and natural gas industries — Arctic offshore structures
2 © ISO 2010 – All rights reserved

ISO 19901-3:2010(E)
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 19900, ISO 19902 and the following
apply.
3.1
abnormal value
value of a parameter of abnormal severity used in accidental limit state checks in which a structure should not
suffer complete loss of integrity
NOTE 1 Abnormal design situations are used to provide robustness against events with a probability of exceedance of
−3 −4
typically between 10 and 10 per annum by avoiding, for example, gross overloading.
−3 −4
NOTE 2 Abnormal values and events have probabilities of exceedance of the order of 10 to 10 per annum. In the
limit state checks, some or all of the partial factors are set to 1,0.
[ISO 19902:2007, definition 3.1]
3.2
accidental event
−3 −4
event with a low probability of occurrence (but greater than 10 to 10 per year) that needs to be taken into
consideration
3.3
active fire protection
system of fire protection that reacts to a fire by discharging water or an inert or reactive substance in the
vicinity of the fire to extinguish it
NOTE There is a possibility that such a system fails to operate as designed.
3.4
caisson
appurtenance used for abstracting water from the sea or as a drain
3.5
conductor
tubular pipe extending upward from the sea floor or below containing pipes that extend into the petroleum
reservoir
[ISO 19900:2002, definition 2.9]
NOTE 1 A conductor is generally vertical, and is continuous from below the sea floor to the wellbay in the topsides and
can be laterally supported in both the support structure and topsides structure. The vertical support is in the seabed.
NOTE 2 In a few cases, conductors are rigidly attached to the topsides or to the support structure above sea level. In
these cases, the conductor's axial stiffness can affect the load distribution within the overall structure.
3.6
critical component
structural component, failure of which would cause failure of the whole structure, or a significant part of it
NOTE A critical component is part of the primary structure.
[ISO 19902:2007, definition 3.12]
3.7
design accidental action
−3 −4
accidental action with a probability of occurrence greater than 10 to 10 per year
ISO 19901-3:2010(E)
3.8
design service life
assumed period for which a structure is to be used for its intended purpose with anticipated maintenance, but
without substantial repair being necessary
[ISO 19900:2002, definition 2.12]
3.9
design situation
set of physical conditions representing real conditions during a certain time interval for which the design will
demonstrate that relevant limit states are not exceeded
[ISO 19900:2002, definition 2.13]
3.10
design value
value derived from the representative value for use in the design verification procedure
[ISO 19900:2002, definition 2.14]
3.11
explosion
rapid chemical reaction of gas or dust in air
NOTE An explosion results in increased temperatures and pressure impulses. A gas explosion on an offshore
platform is usually a deflagration in which flame speeds remain subsonic.
[ISO 19902:2007, definition 3.17]
3.12
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
NOTE The method for determining exposure levels is described in ISO 19902. An exposure level 1 platform is the
most critical and exposure level 3 the least. A normally manned platform which cannot be reliably evacuated before a
design event will be an exposure level 1 platform.
[ISO 19900:2002, definition 2.15]
3.13
extreme value
value of a parameter used in ultimate limit state checks, in which a structure's global behaviour is intended to
stay in the elastic range
−2
NOTE Extreme values and events have probabilities of exceedance of the order of 10 per annum.
[ISO 19902:2007, definition 3.19]
3.14
load case
compatible load arrangements, sets of deformations and imperfections considered simultaneously with
permanent actions and fixed variable actions for a particular design or verification
[ISO 19902:2007, definition 3.29]
NOTE Load arrangements are the identification of the position, magnitude and direction of a free action.
3.15
mitigation
action taken to reduce the consequences of a hazardous event
EXAMPLE Provision of fire or explosion walls; use of water deluge on gas detection; structural strengthening.
4 © ISO 2010 – All rights reserved

ISO 19901-3:2010(E)
3.16
nominal value
value assigned to a basic variable determined on a non-statistical basis, typically from acquired experience or
physical conditions
[ISO 19900:2002, definition 2.22]
3.17
owner
representative of the companies which own a development
NOTE The owner will normally be the operator on behalf of co-licensees.
[ISO 19902:2007, definition 3.36]
3.18
passive fire protection
PFP
coating on the surface of a structural component that improves the structural component's resistance to fire
NOTE Some PFP can produce toxic fumes in fires.
3.19
platform
complete assembly including structure, topsides and, where applicable, foundations
[ISO 19900:2002, definition 2.23]
3.20
regulator
authority established by a national governmental administration to oversee the activities of the offshore oil and
natural gas industries within its jurisdiction, with respect to the overall safety to life and protection of the
environment
NOTE 1 The term regulator can encompass more than one agency in any particular territorial waters.
NOTE 2 The regulator can appoint other agencies, such as marine classification societies, to act on its behalf, and in
such cases, regulator as it is used in this International Standard includes such agencies.
NOTE 3 In this International Standard, the term regulator does not include any agency responsible for approvals to
extract hydrocarbons, unless such agency also has responsibility for safety and environmental protection.
[ISO 19902:2007, definition 3.40]
3.21
representative value
value assigned to a basic variable for verification of a limit state
[ISO 19900:2002, definition 2.26]
3.22
retur
...