Petroleum, petrochemical and natural gas industries - Production assurance and reliability management (ISO 20815:2018)

This document describes the concept of production assurance within the systems and operations
associated with exploration drilling, exploitation, processing and transport of petroleum, petrochemical
and natural gas resources. This document covers upstream (including subsea), midstream and
downstream facilities, petrochemical and associated activities. It focuses on production assurance of
oil and gas production, processing and associated activities and covers the analysis of reliability and
maintenance of the components. This includes a variety of business categories and associated systems/
equipment in the oil and gas value chain. Production assurance addresses not only hydrocarbon
production, but also associated activities such as drilling, pipeline installation and subsea intervention.
This document provides processes and activities, requirements and guidelines for systematic
management, effective planning, execution and use of production assurance and reliability technology.
This is to achieve cost-effective solutions over the life cycle of an asset development project structured
around the following main elements:
— production assurance management for optimum economy of the facility through all of its life cycle
phases, while also considering constraints arising from health, safety, environment, and quality;
— planning, execution and implementation of reliability technology;
— application of reliability and maintenance data;
— reliability-based technology development, design and operational improvement.
The IEC 60300-3 series addresses equipment reliability and maintenance performance in general.
This document designates 12 processes, of which seven are defined as core production assurance
processes and addressed in this document. The remaining five processes are denoted as interacting
processes and are outside the scope of this document. The interaction of the core production assurance
processes with these interacting processes, however, is within the scope of this document as the
information flow to and from these latter processes is required to ensure that production assurance
requirements can be fulfilled.
The only requirement mandated by this document is the establishment and execution of the production
assurance programme (PAP). It is important to reflect the PAP in the overall project management in the
project for which it applies.
This document recommends that the listed processes and activities be initiated only if they can be
considered to add value.

Erdöl-, petrochemische und Erdgasindustrie - Betriebsoptimierung und Zuverlässigkeitsmanagement (ISO 20815:2018)

Industries du pétrole, de la pétrochimie et du gaz naturel - Assurance de la production et management de la fiabilité (ISO 20815:2018)

Le présent document introduit le concept d'assurance production dans les systèmes et les opérations liés au forage, à l'exploitation, au traitement et au transport des ressources pétrolières, pétrochimiques et en gaz naturel. Le présent document couvre les installations et les activités amont (y compris sous-marines), intermédiaires et aval, la pétrochimie ainsi que les activités associées. Il est axé sur l'assurance production relative à la production du pétrole et du gaz, sur le traitement et les opérations associées et couvre l'analyse de la fiabilité et de la maintenance des composants. Cela comprend une variété de catégories d'activité et de systèmes/équipements associés au sein de la chaîne de valeur du gaz et du pétrole. L'assurance production concerne non seulement la production des hydrocarbures, mais également les activités associées telles que le forage, l'installation de conduites et les interventions sous-marines.
Le présent document fournit des processus et des activités, des exigences et des lignes directrices pour la gestion systématique, la planification, l'exécution et l'utilisation efficaces de l'assurance production et des techniques fiabilistes. Le but est d'obtenir des solutions rentables sur tout le cycle de vie d'un projet de développement d'une installation de production structurée autour des éléments principaux suivants:
—          gestion de l'assurance production pour une économie optimale de l'installation durant toutes les phases de son cycle de vie, tout en tenant compte des contraintes résultant de facteurs liés à la santé, à la sécurité, à l'environnement et à la qualité;
—          planification, exécution et mise en œuvre des techniques fiabilistes;
—          application des données de fiabilité et de maintenance;
—          amélioration du développement, de la conception et de l'exploitation de technologies basées sur la fiabilité.
La série IEC 60300-3 a trait à la fiabilité des équipements et à l'exécution de la maintenance.
Le présent document définit douze processus, dont sept sont définis comme des processus fondamentaux de l'assurance production et sont abordés dans le présent document. Les cinq processus restants sont appelés processus en interaction et ne relèvent pas du domaine d'application du présent document. L'interaction des processus fondamentaux de l'assurance production avec ces processus interactifs s'inscrit toutefois dans le domaine d'application du présent document car le flux d'informations à destination et en provenance de ces derniers processus est requis pour s'assurer que les exigences de l'assurance production peuvent être remplies.
La seule exigence spécifiée par le présent document concerne l'établissement et l'exécution du programme d'assurance production (PAP). Il est important que le PAP se reflète dans la gestion globale du projet auquel il s'applique.
Le présent document recommande de ne lancer les processus et activités qu'il énumère que s'ils peuvent apporter de la valeur ajoutée.

Petrokemična industrija ter industrija za predelavo nafte in zemeljskega plina - Optimizacija proizvodnje in upravljanje zanesljivosti (ISO 20815:2018)

Ta dokument opisuje koncept zagotavljanja proizvodnje v sistemih in operacijah, povezanih z raziskovalnim vrtanjem, izkoriščanjem, predelavo in prevozom nafte ter petrokemičnih virov in virov zemeljskega plina. Ta dokument zajema objekte geoloških raziskav in proizvodnje (vključno s podvodnimi), transporta, predelave in trženja nafte oziroma zemeljskega plina ter petrokemične in z njimi povezane dejavnosti. Osredotoča se na zagotavljanje proizvodnje nafte in plina, predelavo in s tem povezane dejavnosti ter zajema analizo zanesljivosti in vzdrževanja komponent. To vključuje različne poslovne kategorije in pripadajoče sisteme/opremo v vrednostni verigi nafte in zemeljskega plina. Zagotavljanje proizvodnje se ne nanaša samo na proizvodnjo ogljikovodikov, temveč tudi na povezane dejavnosti, kot so vrtanje, namestitev cevovodov in podvodni posegi. Ta dokument vsebuje postopke in dejavnosti, zahteve in smernice za sistematično upravljanje, učinkovito načrtovanje, izvajanje ter uporabo tehnologije za optimizacijo in zanesljivost proizvodnje. S tem se želi doseči stroškovno učinkovite rešitve v celotnem življenjskem ciklu projekta razvoja sredstev, oblikovanega na podlagi teh glavnih elementov:
– upravljanje optimizacije proizvodnje za optimalno ekonomičnost objekta skozi vse faze njegovega življenjskega cikla ob upoštevanju omejitev v zvezi z zdravjem, varnostjo, okoljem in kakovostjo;
– načrtovanje, izvajanje in uvajanje tehnologije zanesljivosti;
– uporaba podatkov o zanesljivosti in vzdrževanju;
– razvoj, projektiranje in izboljšanje delovanja na podlagi zanesljivosti.
Skupina standardov IEC 60300-3 obravnava zanesljivost in vzdrževanje opreme na splošno. Ta dokument opredeljuje 12 procesov, od katerih jih je sedem opredeljenih kot procesi optimizacije temeljne proizvodnje. Preostalih pet procesov je označenih kot medsebojno delujoči procesi in so zunaj področja uporabe tega dokumenta. Vzajemno delovanje procesov optimizacije temeljne proizvodnje s temi interakcijskimi procesi pa je zajeto v tem dokumentu, saj je za izpolnjevanje zahtev optimizacije proizvodnje potreben pretok informacij do teh procesov in iz njih.
Edina zahteva, določena v tem dokumentu, je vzpostavitev in izvajanje programa optimizacije proizvodnje (PAP). Pomembno je, da se program optimizacije proizvodnje odraža v celotnem vodenju projekta, za katerega se uporablja.
Ta dokument priporoča, da se navedeni procesi in aktivnosti začnejo izvajati le, če projektu lahko zagotovijo dodano vrednost.

General Information

Status
Published
Public Enquiry End Date
30-Sep-2017
Publication Date
10-Dec-2018
Technical Committee
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
06-Dec-2018
Due Date
10-Feb-2019
Completion Date
11-Dec-2018

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Standards Content (Sample)

SLOVENSKI STANDARD
SIST EN ISO 20815:2019
01-februar-2019
1DGRPHãþD
SIST EN ISO 20815:2010
3HWURNHPLþQDLQGXVWULMDWHULQGXVWULMD]DSUHGHODYRQDIWHLQ]HPHOMVNHJDSOLQD
2SWLPL]DFLMDSURL]YRGQMHLQXSUDYOMDQMH]DQHVOMLYRVWL ,62
Petroleum, petrochemical and natural gas industries - Production assurance and
reliability management (ISO 20815:2018)
Erdöl-, petrochemische und Erdgasindustrie - Betriebsoptimierung und
Zuverlässigkeitsmanagement (ISO 20815:2018)
Industries du pétrole, de la pétrochimie et du gaz naturel - Assurance de la production et
management de la fiabilité (ISO 20815:2018)
Ta slovenski standard je istoveten z: EN ISO 20815:2018
ICS:
03.100.01 Organizacija in vodenje Company organization and
podjetja na splošno management in general
75.020 Pridobivanje in predelava Extraction and processing of
nafte in zemeljskega plina petroleum and natural gas
SIST EN ISO 20815:2019 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN ISO 20815:2019

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SIST EN ISO 20815:2019


EN ISO 20815
EUROPEAN STANDARD

NORME EUROPÉENNE

November 2018
EUROPÄISCHE NORM
ICS 75.180.01; 75.200 Supersedes EN ISO 20815:2010
English Version

Petroleum, petrochemical and natural gas industries -
Production assurance and reliability management (ISO
20815:2018)
Industries du pétrole, de la pétrochimie et du gaz Erdöl-, petrochemische und Erdgasindustrie -
naturel - Assurance de la production et management de Betriebsoptimierung und Zuverlässigkeitsmanagement
la fiabilité (ISO 20815:2018) (ISO 20815:2018)
This European Standard was approved by CEN on 7 October 2018.

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, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,
Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, 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
© 2018 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 20815:2018 E
worldwide for CEN national Members.

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SIST EN ISO 20815:2019
EN ISO 20815:2018 (E)
Contents Page
European foreword . 3

2

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SIST EN ISO 20815:2019
EN ISO 20815:2018 (E)
European foreword
This document (EN ISO 20815:2018) 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 May 2019, and conflicting national standards shall be
withdrawn at the latest by May 2019.
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.
This document supersedes EN ISO 20815:2010.
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, Former Yugoslav Republic of Macedonia,
France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta,
Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Turkey and the United Kingdom.
Endorsement notice
The text of ISO 20815:2018 has been approved by CEN as EN ISO 20815:2018 without any modification.

3

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SIST EN ISO 20815:2019

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SIST EN ISO 20815:2019
INTERNATIONAL ISO
STANDARD 20815
Second edition
2018-10
Petroleum, petrochemical and
natural gas industries — Production
assurance and reliability management
Industries du pétrole, de la pétrochimie et du gaz naturel —
Assurance de la production et management de la fiabilité
Reference number
ISO 20815:2018(E)
©
ISO 2018

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SIST EN ISO 20815:2019
ISO 20815:2018(E)

COPYRIGHT PROTECTED DOCUMENT
© ISO 2018
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 2018 – All rights reserved

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SIST EN ISO 20815:2019
ISO 20815:2018(E)

Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms, definitions and abbreviated terms . 2
3.1 Terms and definitions . 2
3.2 Abbreviations .15
4 Production assurance and decision support .17
4.1 Users of this document .17
4.2 Framework conditions .17
4.3 Optimization process .19
4.4 Production assurance programme .21
4.4.1 Objectives .21
4.4.2 Project risk categorization .22
4.4.3 Programme activities .23
4.5 Alternative standards .25
5 Production assurance processes and activities.26
Annex A (informative) Contents of production assurance programme (PAP) .28
Annex B (informative) Core production assurance processes and activities .30
Annex C (informative) Interacting production assurance processes and activities .39
Annex D (informative) Production performance analyses .43
Annex E (informative) Reliability and production performance data .50
Annex F (informative) Performance objectives and requirements .52
Annex G (informative) Performance measures for production availability .56
Annex H (informative) Relationship to major accidents .69
Annex I (informative) Outline of techniques .71
Bibliography .96
© ISO 2018 – All rights reserved iii

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SIST EN ISO 20815:2019
ISO 20815:2018(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.
This second edition cancels and replaces the first edition (ISO 20815:2008), which has been technically
revised. The main changes compared to the previous edition are as follows:
— Clause 3: several new terms, definitions and abbreviations;
— Clause 4: new 4.1 and new Figure 2;
— Annexes A, B, C and E: minor changes;
— Annex D: various new text and new figures;
— Annex F: new text in Clause F.3, new Clause F.4, and new figure;
— Annex G and H: some changes in Clauses G.2, G.3, H.1 and H.2;
— Annex I: various changes in Clauses I.7 to I.10, I.18 to I.22, and new Clauses I.23 to I.26.
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.
iv © ISO 2018 – All rights reserved

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SIST EN ISO 20815:2019
ISO 20815:2018(E)

Introduction
The petroleum, petrochemical and natural gas industries involve large capital investment costs as well
as operational expenditures. The profitability of these industries is dependent upon the reliability,
availability and maintainability of the systems and components that are used. Therefore, for optimal
production availability in the oil and gas business, a standardized, integrated reliability approach is
required.
The concept of production assurance, introduced in this document, enables a common understanding
with respect to use of reliability technology in the various life cycle phases and covers the activities
implemented to achieve and maintain a performance level that is at its optimum in terms of the overall
economy and, at the same time, consistent with applicable regulatory and framework conditions.
Annexes A to I are for information only.
© ISO 2018 – All rights reserved v

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SIST EN ISO 20815:2019

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SIST EN ISO 20815:2019
INTERNATIONAL STANDARD ISO 20815:2018(E)
Petroleum, petrochemical and natural gas industries —
Production assurance and reliability management
IMPORTANT — The electronic file of this document contains colours which are considered to be
useful for the correct understanding of the document. Users should therefore consider printing
this document using a colour printer.
1 Scope
This document describes the concept of production assurance within the systems and operations
associated with exploration drilling, exploitation, processing and transport of petroleum, petrochemical
and natural gas resources. This document covers upstream (including subsea), midstream and
downstream facilities, petrochemical and associated activities. It focuses on production assurance of
oil and gas production, processing and associated activities and covers the analysis of reliability and
maintenance of the components. This includes a variety of business categories and associated systems/
equipment in the oil and gas value chain. Production assurance addresses not only hydrocarbon
production, but also associated activities such as drilling, pipeline installation and subsea intervention.
This document provides processes and activities, requirements and guidelines for systematic
management, effective planning, execution and use of production assurance and reliability technology.
This is to achieve cost-effective solutions over the life cycle of an asset development project structured
around the following main elements:
— production assurance management for optimum economy of the facility through all of its life cycle
phases, while also considering constraints arising from health, safety, environment, and quality;
— planning, execution and implementation of reliability technology;
— application of reliability and maintenance data;
— reliability-based technology development, design and operational improvement.
The IEC 60300-3 series addresses equipment reliability and maintenance performance in general.
This document designates 12 processes, of which seven are defined as core production assurance
processes and addressed in this document. The remaining five processes are denoted as interacting
processes and are outside the scope of this document. The interaction of the core production assurance
processes with these interacting processes, however, is within the scope of this document as the
information flow to and from these latter processes is required to ensure that production assurance
requirements can be fulfilled.
The only requirement mandated by this document is the establishment and execution of the production
assurance programme (PAP). It is important to reflect the PAP in the overall project management in the
project for which it applies.
This document recommends that the listed processes and activities be initiated only if they can be
considered to add value.
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 2018 – All rights reserved 1

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SIST EN ISO 20815:2019
ISO 20815:2018(E)

ISO 14224:2016, Petroleum, petrochemical and natural gas industries — Collection and exchange of
reliability and maintenance data for equipment
3 Terms, definitions and abbreviated terms
3.1 Terms and definitions
For the purposes of this document, the following terms and definitions 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/
3.1.1
active repair time
effective time to achieve repair of an item
Note 1 to entry: The expectation of the effective time to repair is called MART (mean active repair time).
Note 2 to entry: ISO 14224:2016 distinguishes between the terms mean active repair time (MART), mean time to
repair (MTTR), mean time to restoration (MTTRes), and mean overall repairing time (MRT). See ISO 14224:2016,
3.59, 3.63, 3.64 and 3.61 for further details.
Note 3 to entry: The mean active repair time (MART) is defined as “expected active repair time” in ISO/TR
12489:2013, 3.1.34. See also ISO/TR 12489:2013, Figures 5 and 6.
[SOURCE: ISO 14224:2016, 3.2, modified — Notes 1 to 2 to entry have been added.]
3.1.2
availability
ability to be in a state to perform as required
Note 1 to entry: For a binary item, the measure of the availability is the probability to be in up state (i.e. in a state
belonging to the up state class), see 3.1.59.
Note 2 to entry: In 3.1.4, the figure shows the system is available at time t and unavailable at time t .
1 2
Note 3 to entry: See ISO 14224:2016, Annex C for a more detailed description and interpretation of availability.
Note 4 to entry: Technical or operational availability (see ISO 14224:2016, C.2.3.2 and Table E.3) or system
availability can be used as derived performance measures. Case specific definition of system availability is
needed to reflect the system being addressed.
Note 5 to entry: Further terms are given in ISO/TR 12489:2013.
Note 6 to entry: See Figure G.1 for further information.
[SOURCE: IEC 60050-192:2015, 192-01-23, modified — Notes 1 to 6 to entry have been added.]
3.1.3
barrier
functional grouping of safeguards or controls selected to prevent a major accident or limit the
consequences
[SOURCE: ISO 17776:2016, 3.1.1]
3.1.4
binary item
item with two classes of states
Note 1 to entry: The two classes can be ‘up state’ and ‘down state’.
2 © ISO 2018 – All rights reserved

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SIST EN ISO 20815:2019
ISO 20815:2018(E)

EXAMPLE 1 A usual item with an up state (3.1.59) and a down state (3.1.10) is a binary item. Components A
and B in the figure below are binary items.
EXAMPLE 2 A system made up of two redundant binary items, A and B, has four states: S (both A and B in
1
up state), S (A in up state and B in down state), S (A in down state and B in up state), S (both A and B in down
2 3 4
state). If the system is able to operate as required in states S , S and S and not able in state S , it is a binary item
1 2 3 4
with the up state class {S , S , S } and the down class {S }. This is illustrated in the Figure showing availability
1 2 3 4
behaviour of an 1oo2 system.

3.1.5
common cause failure
failures of multiple items, which would otherwise be considered independent of one another, resulting
from a single cause
Note 1 to entry: See also Notes to entry for common cause failures in ISO 14224:2016, 3.5.
[SOURCE: IEC 60050-192:2015, 192-03-18, modified — Note 1 to entry has been added.]
3.1.6
condition monitoring
obtaining information about physical state or operational parameters
Note 1 to entry: Condition monitoring is used to determine when preventive maintenance may be required.
Note 2 to entry: Condition monitoring may be conducted automatically during operation or at planned intervals.
Note 3 to entry: Condition monitoring is part of condition-based maintenance. See also ISO 14224:2016, Figure 6.
[SOURCE: IEC 60050-192:2015, 192-06-28, modified — Note 3 to entry has been added.]
3.1.7
corrective maintenance
maintenance carried out after fault detection to effect restoration
Note 1 to entry: See also ISO/TR 12489:2013, Figures 5 and 6, which illustrate terms used for quantifying
corrective maintenance.
© ISO 2018 – All rights reserved 3

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SIST EN ISO 20815:2019
ISO 20815:2018(E)

[SOURCE: IEC 60050-192:2015, 192-06-06, modified — Note 1 to entry has been added.]
3.1.8
deliverability
ratio of deliveries to planned deliveries over a specified period of time, when the effect of compensating
elements, such as substitution from other producers and downstream buffer storage, is included
Note 1 to entry: See Figure G.1 for further information.
3.1.9
design life
planned usage time for the total system
Note 1 to entry: to entry It is important not to confuse design life with the ‘mean time to failure’ (MTTF), which
is comprised of several items that might be allowed to fail within the design life of the system as long as repair or
replacement is feasible.
3.1.10
down state
unavailable state
internally disabled state
internal disabled state
state of being unable to perform as required, due to internal fault, or preventive
maintenance
Note 1 to entry: This concept is related to a binary item (3.1.4), which can have several down states forming the
down state class of the item. All the states in the down state class are considered to be equivalent with regard to
the unavailability of the considered item.
Note 2 to entry: See also Notes to entry for down state in ISO 14224:2016, 3.15.
EXAMPLE In the figure in 3.1.4, the down state class of the system S comprises only one state {S } and the
4
system S is in down state at time t .
2
[SOURCE: IEC 60050-192:2015, 192-02-20, modified — Notes 1 and 2 have been added.]
3.1.11
down time
time interval during which an item is in a down state
Note 1 to entry: The down time includes all the delays between the item failure and the restoration of its service.
Down time can be either planned or unplanned (see ISO 14224:2016, Table 4).
Note 2 to entry: Down time can be equipment down time (see Figure 4 and Table 4 in ISO 14224:2016), production
down time (see Figures I.1 and I.2) or down time for other operations (e.g. drilling). It is important to distinguish
between the equipment down time itself and the down time of the plant to which the equipment belongs.
[SOURCE: IEC 60050-192:2015, 192-02-21, modified — Notes 1 and 2 have been added.]
3.1.12
downstream
business category most commonly used in the petroleum industry to describe post-production
processes
Note 1 to entry: See ISO 14224:2016, A.1.4 for further details.
[SOURCE: ISO 14224:2016, 3.17]
4 © ISO 2018 – All rights reserved

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SIST EN ISO 20815:2019
ISO 20815:2018(E)

3.1.13
failure
loss of ability to perform as required
Note 1 to entry: A failure of an item is an event that results in a fault (i.e. a state) of that item (see 3.1.18). This is
illustrated in the figure in 3.1.50 for a binary system S comprising two redundant components A and B.
[SOURCE: IEC 60050-192:2015, 192-03-01, modified — Note 1 to entry has been added.]
3.1.14
failure cause
root cause
set of circumstances that leads to failure
Note 1 to entry: A failure cause can originate during specification, design, manufacture, installation, operation or
maintenance of an item.
Note 2 to entry: See also ISO 14224:2016, B.2.3 and Table B.3, which define failure causes for all equipment
classes.
[SOURCE: IEC 60050-192:2015, 192-03-11, modified — Note 2 to entry has been added.]
3.1.15
failure data
data characterizing the occurrence of a failure event
Note 1 to entry: See also ISO 14224:2016, Table 6.
[SOURCE: ISO 14224:2016, 3.25]
3.1.16
failure mode
manner in which failure occurs
Note 1 to entry: See also the tables in ISO 14224:2016, B.2.6, on the relevant failure modes, which define failure
modes to be used for each equipment class.
[SOURCE: IEC 60050-192:2015, 192-03-17, modified — Note 1 to entry has been added.]
3.1.17
failure rate
conditional probability per unit of time that the item fails between t and t + dt, provided that it has been
working over [0, t]
[SOURCE: ISO/TR 12489:2013, modified — Notes 1 to 4 to entry have been added.]
Note 1 to entry: See ISO 14224:2016, C.3 for further explanation of the failure rate.
Note 2 to entry: This definition applies for the first failure of binary items (3.1.4).
Note 3 to entry: Under the assumptions that the failure rate is constant and that the item is as good as new after
repairs the failure rate can be estimated as the number of failures relative to the corresponding accumulated up
time divided by this accumulated up time. In this case this is the reciprocal of MTTF (3.1.34). In some cases, time
can be replaced by units of use.
Note 4 to entry: The estimation of the failure rate can be based on operating time or calendar time.
3.1.18
fault
inability to perform as required, due to an internal state
Note 1 to entry: A fault of an item results from a failure, either of the item itself, or from a deficiency in an earlier
stage of the life cycle, such as specification, design, manufacture or maintenance. See latent fault (ISO 14224:2016,
3.44). The down states of items A, B and S in the figure in 3.1.46 are examples of faults.
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ISO 20815:2018(E)

Note 2 to entry: An item made of several sub-items (e.g. a system) which continues to perform as required in
presence of faults of one or several sub-items is called fault tolerant.
Note 3 to entry: See also ISO/TR 12489:2013, 3.2.2.
[SOURCE: IEC 60050-192:2015, 192-04-01, modified — Note 2 to entry has been added.]
3.1.19
fault tolerance
attribute of an item that makes it able to perform a required function in the presence of certain given
sub-item faults
3.1.20
human error
discrepancy between the human action taken or omitted and that intended
EXAMPLE Performing an incorrect action; omitting a required action.
[81]
Note 1 to entry: Discrepancy with intention is considered essential in determining human error; see Reference .
Note 2 to entry: The term “human error” is often attributed in hindsight to a human decision, action or inaction
considered to be an initiator or contributory cause of a negative outcome such as loss or harm.
Note 3 to entry: In human reliability assessment, human error is defined as any member of a set of human actions
or activities that exceeds some limit of acceptability, this being an out of tolerance action or failure to act where
[78]
the limits of performance are defined by the system (see Reference ).
Note 4 to entry: See also IEC 62508:2010 for further details.
Note 5 to
...

SLOVENSKI STANDARD
oSIST prEN ISO 20815:2017
01-september-2017
3HWURNHPLþQDLQGXVWULMDWHULQGXVWULMD]DSUHGHODYRQDIWHLQ]HPHOMVNHJDSOLQD
2SWLPL]DFLMDSURL]YRGQMHLQXSUDYOMDQMH]DQHVOMLYRVWL ,62',6
Petroleum, petrochemical and natural gas industries - Production assurance and
reliability management (ISO/DIS 20815:2017)
Erdöl-, petrochemische und Erdgasindustrie - Betriebsoptimierung und
Zuverlässigkeitsmanagement (ISO/DIS 20815:2017)
Industries du pétrole, de la pétrochimie et du gaz naturel - Assurance de la production et
management de la fiabilité (ISO/DIS 20815:2017)
Ta slovenski standard je istoveten z: prEN ISO 20815
ICS:
03.100.01 Organizacija in vodenje Company organization and
podjetja na splošno management in general
75.020 Pridobivanje in predelava Extraction and processing of
nafte in zemeljskega plina petroleum and natural gas
oSIST prEN ISO 20815:2017 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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oSIST prEN ISO 20815:2017

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oSIST prEN ISO 20815:2017
DRAFT INTERNATIONAL STANDARD
ISO/DIS 20815
ISO/TC 67 Secretariat: NEN
Voting begins on: Voting terminates on:
2017-07-26 2017-10-17
Petroleum, petrochemical and natural gas industries —
Production assurance and reliability management
Industries du pétrole, de la pétrochimie et du gaz naturel — Assurance de la production et management de
la fiabilité
ICS: 75.180.01; 75.200
THIS DOCUMENT IS A DRAFT CIRCULATED
This document is circulated as received from the committee secretariat.
FOR COMMENT AND APPROVAL. IT IS
THEREFORE SUBJECT TO CHANGE AND MAY
NOT BE REFERRED TO AS AN INTERNATIONAL
STANDARD UNTIL PUBLISHED AS SUCH.
IN ADDITION TO THEIR EVALUATION AS
ISO/CEN PARALLEL PROCESSING
BEING ACCEPTABLE FOR INDUSTRIAL,
TECHNOLOGICAL, COMMERCIAL AND
USER PURPOSES, DRAFT INTERNATIONAL
STANDARDS MAY ON OCCASION HAVE TO
BE CONSIDERED IN THE LIGHT OF THEIR
POTENTIAL TO BECOME STANDARDS TO
WHICH REFERENCE MAY BE MADE IN
Reference number
NATIONAL REGULATIONS.
ISO/DIS 20815:2017(E)
RECIPIENTS OF THIS DRAFT ARE INVITED
TO SUBMIT, WITH THEIR COMMENTS,
NOTIFICATION OF ANY RELEVANT PATENT
RIGHTS OF WHICH THEY ARE AWARE AND TO
©
PROVIDE SUPPORTING DOCUMENTATION. ISO 2017

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oSIST prEN ISO 20815:2017
ISO/DIS 20815:2017(E)

COPYRIGHT PROTECTED DOCUMENT
© ISO 2017, Published in Switzerland
All rights reserved. Unless otherwise specified, 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
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Tel. +41 22 749 01 11
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copyright@iso.org
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ii © ISO 2017 – All rights reserved

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oSIST prEN ISO 20815:2017
ISO/DIS 20815:2017(E)
Contents
Foreword . vii
Introduction. viii
1 Scope . 1
2 Normative references . 1
3 Terms, definitions and abbreviated terms . 2
3.1 Terms and definitions. 2
3.2 Abbreviations . 15
4 Production assurance and decision support . 17
4.1 Users of this International Standard . 17
4.2 Framework conditions . 17
4.3 Optimization process . 19
4.4 Production assurance programme . 21
4.4.1 Objectives . 21
4.4.2 Project risk categorization. 21
4.4.3 Programme activities . 22
4.5 Alternative standards . 24
5 Production assurance processes and activities. 25
Annex A (informative) Contents of production assurance programme (PAP) . 27
A.1 General . 27
A.2 Title . 27
A.3 Terms of reference . 27
A.4 Production assurance philosophy and performance objectives . 27
A.5 Project risk categorization. 27
A.6 Organization and responsibilities . 28
A.7 Activity schedule . 28
A.8 References . 28
Annex B (informative) Core production assurance processes and activities . 29
B.1 Production assurance requirements — Process 1 . 29
B.2 Production assurance planning — Process 2 . 31
B.3 Design and manufacture for production assurance — Process 3 . 31
B.4 Production assurance — Process 4 . 33
B.5 Risk and reliability analysis — Process 5 . 33
B.6 Verification and validation — Process 6 . 35
B.7 Performance data tracking and analysis — Process 9 . 35
Annex C (informative) Interacting production assurance processes and activities . 37
C.1 General . 37
C.2 Project risk management — Process 7 . 37
C.3 Qualification and testing — Process 8 . 37
C.4 Supply chain management — Process 10 . 38
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oSIST prEN ISO 20815:2017
ISO/DIS 20815:2017(E)
C.5 Management of change — Process 11 . 39
C.6 Organizational learning — Process 12 . 40
Annex D (informative) Production performance analyses . 41
D.1 General . 41
D.2 Planning . 43
D.2.1 Objectives . 43
D.2.2 Production performance analysis information . 43
D.3 Procedure . 44
D.3.1 Preparation . 44
D.3.2 Study basis . 44
D.3.3 Model development . 44
D.3.4 Analysis and assessment . 44
D.3.4.1 Performance measures . 44
D.3.4.2 Sensitivity analyses . 45
D.3.4.3 Importance measures . 45
D.3.5 Reporting and recommendations . 46
D.3.6 Major accidents and rare long duration events . 46
D.3.7 Handling of uncertainty . 46
Annex E (informative) Reliability and production performance data . 48
E.1 Collection of reliability data . 48
E.1.1 General . 48
E.1.2 Equipment boundary and hierarchy definition . 48
E.1.3 Data analysis . 48
E.2 Qualification and application of reliability data . 49
E.3 Production performance data . 49
Annex F (informative) Performance objectives and requirements . 51
F.1 General . 51
F.2 Specifying production assurance . 51
F.3 Verification of requirement fulfilment . 53
F.4 Safety . 54
Annex G (informative) Performance measures for production availability . 55
G.1 General . 55
G.2 Production availability . 56
G.2.1 Volume-based performance measures . 56
G.2.2 Contracted volume . 57
G.2.3 Design capacity . 57
G.2.4 Well-production potential . 58
G.2.5 Planned production volume assuming no down time (planned or unplanned) . 58
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oSIST prEN ISO 20815:2017
ISO/DIS 20815:2017(E)
G.2.6 Planned production volume . 58
G.2.7 Time-based performance measures . 58
G.3 Other parameters . 59
Annex H (informative) Relationship to major accidents . 65
H.1 General . 65
H.2 Criterion for attention in analyses . 66
Annex I (informative) Outline of techniques . 67
I.1 General . 67
I.2 Failure modes and effects analysis . 67
I.3 Fault tree analysis . 68
I.4 Reliability block diagram . 70
I.5 Models for production availability calculations . 71
I.5.1 General . 71
I.5.2 Monte-Carlo simulation principles . 72
I.5.3 Behavioural modelling . 72
I.5.4 Flow network analysis . 72
I.5.5 Petri net analysis . 73
I.6 Design reviews . 74
I.7 Hazard and operability study . 75
I.8 Performance and operability review . 76
I.9 Reliability testing . 77
I.10 Human factors . 78
I.11 Software reliability . 79
I.12 Dependent, common cause and common mode failures. 80
I.13 Life data analysis . 80
I.14 Reliability-centred maintenance analysis . 80
I.15 Risk-based inspection analysis . 81
I.16 Test interval optimization . 81
I.17 Spare parts optimization . 81
I.18 Methods of structural reliability analysis . 82
I.19 Life cycle cost analysis . 82
I.20 Risk and emergency preparedness analyses . 83
I.21 Technology maturity assessment . 84
I.21.1 General . 84
I.21.2 Technology readiness level . 84
I.21.3 Technology novelty category . 85
I.22 Markov process analysis . 86
I.23 Bayesian belief network . 88
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I.24 Life time extension analysis . 88
I.25 Analysis on weather influence on production performance . 89
I.26 Loading performance analysis . 89
Bibliography . 91

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oSIST prEN ISO 20815:2017
ISO/DIS 20815:2017(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 on 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 the following URL:
www.iso.org/iso/foreword.html.
The committee responsible for this document is Technical Committee ISO/TC 67, Materials, equipment
and offshore structures for petroleum, petrochemical and natural gas industries.
This second edition cancels and replaces the first edition (ISO 20815:2008), which has been technically
revised.
The main changes compared to the previous edition are as follows:
 Clause 3: several new terms, definitions and abbreviations;
 Clause 4: new 4.1 and new Figure 5;
 Annexes A, B, C and E: minor changes;
 Annex D: various new text and new figures;
 Annex F: New text in clause F.3, new clause F.4, and new figure;
 Annex G and H: some changes in clauses G.2, H.1 and H.2;
 Annex I: various changes in clauses I.7 - I.10, I.18, I.20 -I.22, and new clauses I.23 - I.26.

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oSIST prEN ISO 20815:2017
ISO/DIS 20815:2017(E)
Introduction
The petroleum and natural gas industries involve large capital investment costs as well as operational
expenditures. The profitability of these industries is dependent upon the reliability, availability and
maintainability of the systems and components that are used. Therefore, for optimal production
availability in the oil and gas business, a standardized, integrated reliability approach is required.
The concept of production assurance, introduced in this document, enables a common understanding
with respect to use of reliability technology in the various life cycle phases and covers the activities
implemented to achieve and maintain a performance level that is at its optimum in terms of the overall
economy and, at the same time, consistent with applicable regulatory and framework conditions.
Annexes A through I are for information only.
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oSIST prEN ISO 20815:2017
ISO/DIS 20815:2017(E)
Petroleum, petrochemical and natural gas industries —
Production assurance and reliability management
1 Scope
This document describes the concept of production assurance within the systems and operations
associated with exploration drilling, exploitation, processing and transport of petroleum, petrochemical
and natural gas resources. This document covers upstream (including subsea), midstream and
downstream facilities, petrochemical and associated activities. It focuses on production assurance of oil
and gas production, processing and associated activities and covers the analysis of reliability and
maintenance of the components. This includes a variety of business categories and associated
systems/equipment in the oil and gas value chain. Production assurance addresses not only
hydrocarbon production, but also associated activities such as drilling, pipeline installation, subsea
intervention, etc.
This document provides processes and activities, requirements and guidelines for systematic
management, effective planning, execution and use of production assurance and reliability technology.
This is to achieve cost-effective solutions over the life cycle of an asset development project structured
around the following main elements:
 production assurance management for optimum economy of the facility through all of its life cycle
phases, while also considering constraints arising from health, safety, environment, and quality;
 planning, execution and implementation of reliability technology;
 application of reliability and maintenance data;
 reliability-based technology development, design and operational improvement.
For standards on equipment reliability and maintenance performance in general, see the IEC 60300-3
series.
This document designates 12 processes, of which seven are defined as core production assurance
processes and addressed in this document. The remaining five processes are denoted as interacting
processes and are outside the scope of this document. The interaction of the core production assurance
processes with these interacting processes, however, is within the scope of this document as the
information flow to and from these latter processes is required to ensure that production assurance
requirements can be fulfilled.
This document recommends that the listed processes and activities be initiated only if they can be
considered to add value.
The only requirement mandated by this document is the establishment and execution of the production
assurance programme (PAP). It is important to reflect the PAP document in the overall project
management in the project for which it applies.
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 14224:2016, Petroleum, petrochemical and natural gas industries — Collection and exchange of
reliability and maintenance data for equipment
© ISO 2017 – All rights reserved 1

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oSIST prEN ISO 20815:2017
ISO/DIS 20815:2017(E)
3 Terms, definitions and abbreviated terms
3.1 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
 ISO Online browsing platform: available at http://www.iso.org/obp
 IEC Electropedia: available at http://www.electropedia.org/
3.1.1
active repair time
effective time to achieve repair of an item
Note 1 to entry: The expectation of the effective time to repair is called MART (mean active repair time).
Note 2 to entry: ISO 14224:2016 distinguishes between the terms mean active repair time, mean time to repair
(MTTR), mean time to restoration (MTTRes), and mean overall repairing time (MRT). See ISO 14224:2016 for
further details.
Note 3 to entry: The mean active repair time (MART)
...

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