EN ISO 19901-9:2019

Petroleum and natural gas industries - Specific requirements for offshore structures - Part 9: Structural integrity management (ISO 19901-9:2019)

This document specifies principles for the structural integrity management (SIM) of offshore structures subjected to known or foreseeable types of actions.
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.
This document is applicable to topsides, including but not limited to the main decks, deck legs, topsides modules, crane pedestals, helideck, drilling derrick, skid beams, flare booms, exhaust towers, radio tower, conductor support frames, and lifeboat davits. 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 (e.g. underwater oil storage tanks, bridges and connecting structures), to the extent to which its requirements are relevant.
This document contains requirements for planning and engineering of the following tasks:
a)    integrity management data requirements;
b)    in-service inspection and integrity management of both new and existing structures;
c)    assessment of existing structures;
d)    evaluation of structures for reuse at different locations;
e)    evaluation of structures for their future removal.

Erdöl- und Erdgasindustrie - Spezielle Anforderungen für Offshore-Anlagen - Teil 9: Integritätsmanagement für Konstruktionen (ISO 19901-9:2019)

Industries du pétrole et du gaz naturel - Exigences spécifiques relatives aux structures en mer - Partie 9: Gestion de l'intégrité structurelle (ISO 19901-9:2019)

Le présent document spécifie les principes régissant la gestion de l'intégrité structurelle (SIM) des structures en mer soumises à des types d'actions connus ou prévisibles.
Il 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.
Le présent document est applicable à la superstructure, y compris, mais sans s'y limiter, les ponts principaux, les jambes de pont, les modules de la superstructure, les socles de grue, le pont hélicoptère, le derrick de forage, les poutres de ripage, les supports de torche, les tours d'évacuation, la tour radio, les ossatures de guidage des tubes conducteurs et les bossoirs des canots de sauvetage. En outre, il est applicable à des structures élastiques prenant appui sur le fond marin, à des structures en acier posées par gravité, à des plates-formes auto-élévatrices, à d'autres structures prenant appui sur le fond marin et à d'autres structures associées aux structures en mer conformes (telles que des citernes sous-marines de stockage de pétrole, des ponts et des structures de connexion) dans la mesure où ses exigences se rapportent à celles-ci.
Le présent document contient des exigences pour la planification et l'ingénierie des tâches suivantes:
a)    les exigences relatives à la gestion de l'intégrité;
b)    l'inspection en service et la gestion de l'intégrité à la fois des nouvelles structures et des structures existantes;
c)    l'évaluation de structures existantes;
d)    l'évaluation de structures en vue d'une réutilisation en des lieux différents;
e)    l'évaluation de structures en vue de leur enlèvement futur.

Industrija za predelavo nafte in zemeljskega plina - Posebne zahteve za naftne ploščadi - 9. del: Celovitost storitev upravljanja (ISO 19901-9:2019)

Ta del standarda ISO 19901 določa inženirske zahteve in priporočila glede procesa celovitosti storitev upravljanja (SIM), ki jih uporablja lastnik za prikaz strukturne ustreznosti za obratovanje obstoječih vrtalnih ploščadi. Ta del standarda ISO 19901 obravnava življenjski cikel ploščadi od koncepta do izločitve iz uporabe in/ali morebitne ponovne uporabe na drugi lokaciji ter se uporablja za:
-   strukturne komponente podstrukture na skladnih na dno pritrjenih naftnih ploščadih, vključno s fiksnimi ploščadmi, skladnimi stolpi, razdelilniki in strukturami, ki se uporabljajo kot del alternativnega energetskega koncepta;
-   strukturne komponente na palubi, ne glede na strukturno obliko, vključno s plavajočimi objekti in dvižnimi ploščadmi.

General Information

• Status: Published
• Publication Date: 10-Sep-2019
• Withdrawal Date: 30-Mar-2020
• ICS: 75.180.10 - Exploratory, drilling and extraction equipment
• Technical Committee: CEN/TC 12 - Materials, equipment and offshore structures for petroleum and natural gas industries
• Drafting Committee: CEN/TC 12 - Materials, equipment and offshore structures for petroleum and natural gas industries
• Current Stage: 6060 - Definitive text made available (DAV) - Publishing
• Start Date: 11-Sep-2019
• Due Date: 06-Nov-2019
• Completion Date: 11-Sep-2019
• Ref Project: SIST EN ISO 19901-9:2019 - Petroleum and natural gas industries - Specific requirements for offshore structures - Part 9: Structural integrity management (ISO 19901-9:2019)

Overview

EN ISO 19901-9:2019 - "Petroleum and natural gas industries - Specific requirements for offshore structures - Part 9: Structural integrity management (SIM)" (CEN adoption) specifies principles, requirements and recommendations for structural integrity management of fixed steel offshore structures subjected to known or foreseeable actions. It applies to caissons, free‑standing and braced structures, jackets, monotowers, towers and related topsides and components (decks, crane pedestals, helidecks, flare booms, lifeboat davits, etc.). The standard also addresses applicable elements of compliant bottom‑founded structures, steel gravity structures, jack‑ups and other connected offshore assets to the extent relevant.

Key Topics and Requirements

• SIM fundamentals and management framework: Defines limit states, performance levels, fitness‑for‑service principles and required management interfaces.
• Data requirements and data management: Specifies integrity management data needs, treatment of missing data and data systems for decision support.
• In‑service inspection and integrity management: Requirements and recommendations for planning, inspection types/methods, scope and intervals for new and existing structures.
• Assessment and fitness‑for‑service: Procedures for assessing existing structures, including hazard identification, degradation mechanisms, risk evaluation (consequence and likelihood) and demonstration of fitness‑for‑service.
• Re‑use and decommissioning evaluations: Guidance for evaluating structures for relocation, reuse at different locations and for future removal.
• SIM strategy and programs: Development of inspection, maintenance, monitoring and evacuation strategies; creation of integrated SIM programs and specifications.
• Monitoring and special topics: Topics include weight/CoG monitoring, deck elevation, natural frequency tracking, corrosion protection monitoring and metocean investigations.

Applications and Who Uses This Standard

EN ISO 19901-9:2019 is intended for practical application across the offshore lifecycle:

• Asset integrity managers and operator engineering teams use it to establish SIM programs and inspection/maintenance strategies.
• Design, inspection and fitness‑for‑service engineers reference it for assessing structural acceptability and planning remedial actions.
• Inspection providers and contractors use it to define inspection scope, methods and intervals.
• Regulators, auditors and HSE professionals rely on its requirements to evaluate compliance and risk mitigation.
• Decommissioning planners and re‑use assessors apply the guidance when evaluating relocation or removal of structures.

Related Standards

• ISO/EN 19901 series (other parts addressing specific offshore requirements)
• ISO/TC 67 publications on materials, equipment and offshore structures

EN ISO 19901-9:2019 is a practical, decision-focused standard that integrates inspection, monitoring, assessment and risk‑based maintenance to preserve safety and availability of offshore structural assets. Keywords: EN ISO 19901-9:2019, structural integrity management, offshore structures, inspection program, fitness-for-service, topsides, jackets, asset integrity.

Standards Content (Sample)

SLOVENSKI STANDARD
01-november-2019
Industrija za predelavo nafte in zemeljskega plina - Posebne zahteve za naftne
ploščadi - 9. del: Celovitost storitev upravljanja (ISO 19901-9:2019)
Petroleum and natural gas industries - Specific requirements for offshore structures -
Part 9: Structural integrity management (ISO 19901-9:2019)
Erdöl- und Erdgasindustrie - Spezielle Anforderungen für Offshore-Anlagen - Teil 9:
Integritätsmanagement für Konstruktionen (ISO 19901-9:2019)
Industries du pétrole et du gaz naturel - Exigences spécifiques relatives aux structures
en mer - Partie 9: Gestion de l'intégrité structurelle (ISO 19901-9:2019)
Ta slovenski standard je istoveten z: EN ISO 19901-9:2019
ICS:
75.180.10 Oprema za raziskovanje, Exploratory, drilling and
vrtanje in odkopavanje extraction equipment
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN ISO 19901-9
EUROPEAN STANDARD
NORME EUROPÉENNE
September 2019
EUROPÄISCHE NORM
ICS 75.180.10
English Version
Petroleum and natural gas industries - Specific
requirements for offshore structures - Part 9: Structural
integrity management (ISO 19901-9:2019)
Industries du pétrole et du gaz naturel - Exigences Erdöl- und Erdgasindustrie - Spezielle Anforderungen
spécifiques relatives aux structures en mer - Partie 9: für Offshore-Anlagen - Teil 9: Integritätsmanagement
Gestion de l'intégrité structurelle (ISO 19901-9:2019) für Konstruktionen (ISO 19901-9:2019)
This European Standard was approved by CEN on 8 June 2019.

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
© 2019 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 19901-9:2019 E
worldwide for CEN national Members.

Contents Page
European foreword . 3

European foreword
This document (EN ISO 19901-9:2019) 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 March 2020, and conflicting national standards shall
be withdrawn at the latest by March 2020.
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.
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 19901-9:2019 has been approved by CEN as EN ISO 19901-9:2019 without any
modification.
INTERNATIONAL ISO
STANDARD 19901-9
First edition
2019-07
Petroleum and natural gas
industries — Specific requirements
for offshore structures —
Part 9:
Structural integrity management
Industries du pétrole et du gaz naturel — Exigences spécifiques
relatives aux structures en mer —
Partie 9: Gestion de l'intégrité structurelle
Reference number
ISO 19901-9:2019(E)
©
ISO 2019
ISO 19901-9:2019(E)
© 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: [phone]
Fax: [phone]
Email: [e-mail]
Website: www.iso.org
Published in Switzerland
ii © ISO 2019 – All rights reserved

ISO 19901-9:2019(E)
Contents Page
Foreword .vi
Introduction .vii
1 Scope . 1
2 Normative references . 1
3  Terms and definitions . 2
4 Symbols . 4
5 Abbreviated terms . 5
6 SIM fundamentals . 6
6.1 General . 6
6.2 Limit states and performance levels . 6
6.3 Fitness-for-service assessment . 6
6.4 Management framework . 7
6.5 Design . 8
6.6 Topsides . 9
6.7 Continued service . 9
6.8 Structural integrity interfaces. 9
7 SIM process . 9
8 SIM data.10
8.1 General .10
8.2 Missing data .11
8.3 Data management .11
9 SIM evaluation .12
9.1 General .12
9.2 Data evaluation .12
9.3 Hazards, hazardous events and degradation mechanisms .12
9.4 Critical structure (CS) .12
9.5 Risk .12
9.5.1 General.12
9.5.2 Consequence . . .13
9.5.3 Likelihood .13
9.5.4 Risk presentation .13
9.6 Demonstrating fitness-for-service .13
9.7 Assessment .14
9.7.1 General.14
9.7.2 Assessment motive .14
9.7.3 Assessment initiators .15
9.8 Mitigation measures .15
9.8.1 General.15
9.8.2 Consequence reduction .16
9.8.3 Likelihood reduction .16
10 SIM strategy .16
10.1 General .16
10.2 Inspection strategy .17
10.2.1 General.17
10.2.2 Inspection motives .18
10.2.3 Inspection type .18
10.2.4 Inspection method .18
10.2.5 Inspection interval .18
10.2.6 Inspection scope .20
10.2.7 Pre-selected inspection areas .20
ISO 19901-9:2019(E)
10.3 Maintenance strategy .21
10.4 Monitoring strategy .21
10.4.1 General.21
10.4.2 Weight and centre of gravity (CoG) monitoring .22
10.4.3 Deck elevation monitoring .22
10.4.4 Natural frequency monitoring .22
10.4.5 Corrosion protection monitoring .22
10.4.6 Metocean monitoring . .22
10.5 Evacuation strategy .22
10.6 Marine site investigations .23
11 SIM Program .23
11.1 General .23
11.2 Inspection program.23
11.2.1 General.23
11.2.2 Specifications .23
11.2.3 Inspection method .24
11.3 Maintenance program .25
11.4 Monitoring program .25
12 Assessment .26
12.1 General .26
12.2 Assessment information .26
12.3 Assessment method .26
12.3.1 General.26
12.3.2 Qualitative method . .27
12.3.3 Semi-quantitative method .28
12.3.4 Quantitative methods .29
12.3.5 Fatigue analysis .31
12.4 Assessment model .31
12.4.1 General.31
12.4.2 Tubular members .31
12.4.3 Connections .32
12.4.4 Conductors .32
12.4.5 Damage .32
12.4.6 Repaired and strengthened elements .33
12.4.7 Foundation model .33
12.4.8 Material strength .34
12.5 Assessment for gravity hazard .34
12.5.1 General.34
12.5.2 Design level method (DLM) .35
12.5.3 Ultimate strength method (USM) .35
12.6 Assessment for metocean hazard .35
12.6.1 General.35
12.6.2 Metocean criteria . . .35
12.6.3 Crest elevation .35
12.6.4 Metocean action combinations — Jacket .36
12.6.5 Metocean action combinations — Deck .36
12.6.6 Directionality of metocean hazards .36
12.6.7 Design level method (DLM) .37
12.6.8 Linear-elastic redundancy method .37
12.6.9 Ultimate strength method (USM) .37
12.7 Assessment for seismic hazard .38
12.7.1 General.38
12.7.2 Seismic criteria .38
12.7.3 Seismic action combinations .38
12.7.4 Directionality of seismic hazards .39
12.7.5 Design level method (DLM) .39
12.7.6 Ultimate strength method (USM) .40
iv © ISO 2019 – All rights reserved

ISO 19901-9:2019(E)
12.8 Assessment for collision hazard .40
12.8.1 General.40
12.8.2 Collision zone .41
12.8.3 Collision criteria .41
12.8.4 Directionality of collision hazards .41
12.8.5 Collision assessment method.41
12.9 Assessment for ice hazard .41
12.10 Assessment for explosion hazard .42
12.11 Assessment for fire hazard .42
13 Reuse .42
13.1 General .42
13.2 Fatigue in reused structures .42
13.3 Steel in reused structures .42
13.4 Inspection of reused structures .43
13.4.1 General.43
13.4.2 Initial condition assessment of structural members and connections .43
13.4.3 Extent of weld inspection .43
13.4.4 Corrosion protection systems .44
13.5 Removal and reinstallation.44
14 Decommissioning and removal .44
14.1 General .44
14.2 Decommissioning process .44
14.3 Pre-decommissioning data gathering .44
14.4 Planning and engineering .44
14.5 Well decommissioning .45
14.6 Facilities decommissioning .45
14.7 Pipeline decommissioning .45
14.8 Conductor removal .45
14.9 Structure removal .45
14.10 Site clearance .45
Annex A (informative) Additional information and guidance .46
Bibliography .141
ISO 19901-9:2019(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.
The procedures used to develop this document and those intended for its further maintenance are
described in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the
different types of ISO documents should be noted. This document was drafted in accordance with the
editorial rules of the ISO/IEC Directives, Part 2 (see www .iso .org/directives).
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. Details of
any patent rights identified during the development of the document will be in the Introduction and/or
on the ISO list of patent declarations received (see www .iso .org/patents).
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and
expressions related to conformity assessment, as well as information about ISO's adherence to the
World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT) see www .iso
.org/iso/foreword .html.
This document 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.
A list of all parts in the ISO 19901 series can be found on the ISO website.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www .iso .org/members .html.
vi © ISO 2019 – All rights reserved

ISO 19901-9:2019(E)
Introduction
Structural integrity management (SIM) is the implementation of engineering, inspection, maintenance,
monitoring and remediation activities required to demonstrate the fitness-for-service of a structure for
its intended application throughout its total service life and prevent/mitigate severe or catastrophic
health, safety, environmental, or structural events. The SIM process provides a proactive approach to
monitor, evaluate and assess structural condition and establish a procedure to validate the fitness-for-
service of an offshore structure.
The purpose of SIM is to provide a process for demonstrating the integrity of the structure throughout
its intended total service life. Approaches to dealing with SIM vary depending upon field life, the type of
structure and the sophistication of regional infrastructure where the structure is located. In turn, these
factors can influence the philosophical approach to the specification of SIM which can vary from one
involving emphasis on the use of monitoring equipment to one with a preference for the extensive use
of inspections. Additionally, design decisions on safety factors, design margins, corrosion protection,
component redundancy and system reliabilities will influence the SIM strategy and program.
SIM process choices are made in the design (e.g. selection of materials, condition monitoring systems,
new or proven technology, robustness of design, redundancy, and fabrication/installation methods)
that will influence SIM activities during the operations phase. Implementation of a SIM process can
benefit significantly from design decisions, such as providing access for inspection and maintenance.
A SIM process is used to develop an inspection scope, program and frequency that, when executed,
provides information on the condition of the structure, which can be used to understand present
and emerging risk from operating the topsides, and provide information for determining the ongoing
strategy for mitigating that risk. A well-implemented SIM process will maintain the structure’s fitness-
for-service for the operational life of the platform and through the decommissioning process.
Initial SIM development begins early as part of the structure’s new design or reuse, ideally during the
structure’s concept and select stages. Most of the initial SIM data, strategies and program philosophies
will be generated during the design by the project team and ultimately handed over to the structure’s
operating team. Once commissioned, the effective operation of the structure is contingent on the
provided SIM philosophy and design documentation from the project team. These deliverables (e.g.
design documents, drawings, computer models) are most useful to the operating team when they
are complete, up-to-date (i.e. reflect as commissioned installation), organized, in a usable format and
readily accessible. To provide sustainable SIM, the project team and operating team work collaboratively
during the project in defining the necessary SIM deliverables.
The platform operating team is responsible for validating that the design data are comprehensive and
complete. In addition, the operating team is responsible for demonstrating that the SIM strategies
conform to the operator’s risk criteria, regional regulations and that the SIM strategies are workable
based on location infrastructure and capabilities. National and regional regulations can require SIM
documentation in a form suitable for verification or for review by a regulator.
[5]
ISO 19904-1 is applicable to the integrity management (IM) of hull, moorings and marine systems of
existing floating offshore structures. However, this document is applicable to the structural integrity
management of the topsides structural components of floating facilities.
[6]
ISO 19905-1 is applicable to the IM of the legs, primary hull structure, spudcans, jacking-systems and
marine systems of existing mobile jack-up offshore structures and for setting the limit states. However,
this document is applicable to the structural integrity management of permanently located jack-ups.
INTERNATIONAL STANDARD ISO 19901-9:2019(E)
Petroleum and natural gas industries — Specific
requirements for offshore structures —
Part 9:
Structural integrity management
1 Scope
This document specifies principles for the structural integrity management (SIM) of offshore structures
subjected to known or foreseeable types of actions.
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.
This document is applicable to topsides, including but not limited to the main decks, deck legs, topsides
modules, crane pedestals, helideck, drilling derrick, skid beams, flare booms, exhaust towers, radio
tower, conductor support frames, and lifeboat davits. 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 (e.g. underwater oil storage tanks, bridges and connecting
structures), to the extent to which its requirements are relevant.
This document contains requirements for planning and engineering of the following tasks:
a) integrity management data requirements;
b) in-service inspection and integrity management of both new and existing structures;
c) assessment of existing structures;
d) evaluation of structures for reuse at different locations;
e) evaluation of structures for their future removal.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements 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 19901-9:2019(E)
ISO 19901-4, Petroleum and natural gas industries — Specific requirements for offshore structures —
Part 4: Geotechnical and foundation design considerations
ISO 19901-5, Petroleum and natural gas industries — Specific requirements for offshore structures —
Part 5: Weight control during engineering and construction
ISO 19902, Petroleum and natural gas industries — Fixed steel offshore structures
ISO 19906, Petroleum and natural gas industries — Arctic offshore structures
3  Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 19900, ISO 19901-1,
ISO 19901-2, ISO 19901-4, ISO 19901-5, ISO 19902 and ISO 19906 and the following apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https: //www .iso .org/obp
— IEC Electropedia: available at http: //www .electropedia .org/
3.1
anomaly
in-service survey measurement, which is outside the threshold acceptable from the design or most
recent fitness-for-service assessment
3.2
assessment
detailed qualitative or quantitative determination of the structural component or system strength
3.3
assurance
process to confirm that SIM (3.21) is performed in conformity with the procedures set out in the SIM
policy and written description
3.4
collapse
loss of the load-bearing capacity of the platform through failure of one or more structural components
3.5
continual improvement
ongoing implementation of findings of reviews to improve the SIM process
3.6
defect
imperfection, fault, or flaw in a structural component
3.7
emergency response plan
written document associated with an asset, which defines the actions intended to protect people, the
environment, and property from adverse consequences associated with emergency situations
3.8
inspection program
scope of work for the offshore execution of the inspection activities to determine the condition of the
structure
3.9
inspection strategy
systematic approach to the development of a plan for the in-service inspection of a structure
2 © ISO 2019 – All rights reserved

ISO 19901-9:2019(E)
3.10
mitigation
limitation of negative consequence or reduction in likelihood of a hazardous event or condition
3.11
non-conformance
insufficient strength or inadequate performance of a structure or structural component relative to a
limit state or performance level (3
...