EN ISO 21857:2021
(Main)Petroleum, petrochemical and natural gas industries - Prevention of corrosion on pipeline systems influenced by stray currents (ISO 21857:2021)
Petroleum, petrochemical and natural gas industries - Prevention of corrosion on pipeline systems influenced by stray currents (ISO 21857:2021)
This document establishes the general principles for the evaluation and minimization of the effects of stray current corrosion on external surfaces of buried or immersed pipeline systems caused by AC and DC electrical interference.
Other stray current effects such as overheating, and interference with welding operations are not covered in this document.
A brief description of AC effects, general principles and some guidelines, are provided.
NOTE 1 See ISO 18086 for the effects of alternating current on buried or immersed pipelines.
Systems that can also be affected by stray currents include buried or immersed metal structures such as the following:
a) pipeline systems;
b) metal sheathed cables;
c) tanks and vessels;
d) earthing systems;
e) steel reinforcement in concrete;
f) sheet steel piling.
This document gives guidelines for
— the design of cathodic protection systems that might produce stray currents,
— the design of pipeline systems, or elements of pipeline systems, which are buried or immersed, and which can be subject to stray current corrosion, and
— the selection of appropriate protection or mitigation measures.
Internal corrosion risks from stray currents are not dealt with in detail in this document but principles and measures described here can be applicable for minimizing the interference effects.
NOTE 2 The impact of electromagnetic interference on above-ground appurtenances of pipeline systems is covered in EN 50443, IEC 61140, IEC 60364-4-41, IEC 60479-1, IEC 60364-5-52, IEC/TS 61201 and IEC/TR 60479-5.
This document can also be used for pipeline systems outside of the petrochemical and natural gas industries and other buried or immersed structures.
NOTE 3 EN 50162 provides guidance for railway related structures.
Erdöl-, petrochemische und Erdgasindustrie - Vermeidung von durch Streuströme beeinflusster Korrosion an Rohrleitungssystemen (ISO 21857:2021)
Dieses Dokument legt die allgemeinen Grundsätze für die Bewertung und Minimierung der Auswirkungen von Streustromkorrosion an äußeren Oberflächen von erd- oder wasserverlegten Rohrleitungssystemen fest, die durch eine elektrische Beeinflussung durch Wechsel- und Gleichstrom verursacht wird.
Andere Auswirkungen von Streustrom, wie z. B. die Überhitzung und Beeinflussung von Schweißvorgängen, werden von diesem Dokument nicht behandelt.
Eine kurze Beschreibung der Auswirkungen von Wechselstrom, allgemeine Grundsätze und einige Leitlinien werden bereitgestellt.
ANMERKUNG 1 Siehe ISO 18086 für Auswirkungen von Wechselstrom auf erd- oder wasserverlegte Rohrleitungen.
Systeme, die ebenfalls von Streuströmen beeinträchtigt werden können, umfassen erd- oder wasserverlegte Metallobjekte, wie z. B. folgende:
a) Rohrleitungssysteme;
b) Metallmantelkabel;
c) Tanks und Gefäße;
d) Erdungsanlagen;
e) Stahlbewehrung in Beton;
f) Stahlspundwand.
Dieses Dokument enthält Leitlinien für
— die Auslegung von kathodischen Korrosionsschutzsystemen, die möglicherweise Streuströme erzeugen,
— die Auslegung von Rohrleitungssystemen oder Elementen von Rohrleitungssystemen, die in der Erde oder im Wasser verlegt sind und die möglicherweise Streustromkorrosion unterliegen können und
— die Auswahl von geeigneten Schutz- oder Schadensbegrenzungsmaßnahmen.
Risiken einer Innenkorrosion aufgrund von Streuströmen werden in diesem Dokument nicht ausführlich behandelt, die hier beschriebenen Grundsätze und Maßnahmen können jedoch zur Minimierung der Aus¬wirkungen der Beeinflussung anwendbar sein.
ANMERKUNG 2 Die Auswirkungen elektromagnetischer Beeinflussung auf oberirdische Armaturen von Rohrleitungs¬systemen werden in EN 50443, IEC 61140, IEC 60364 4 41, IEC 60479 1, IEC 60364 5 52, IEC/TS 61201 und IEC/TR 60479 5 behandelt.
Dieses Dokument kann auch für Rohrleitungssysteme außerhalb der petrochemischen und Erdgasindustrie sowie andere erd- oder wasserverlegte Objekte angewendet werden.
ANMERKUNG 3 EN 50162 enthält Leitlinien für bahnbezogene Objekte.
Industries du pétrole, de la pétrochimie et du gaz naturel - Prévention de la corrosion sur les systèmes de conduites soumis à l'influence de courants vagabonds (ISO 21857:2021)
Le présent document établit les principes généraux pour l'évaluation et la réduction au minimum des effets de la corrosion due à des courants vagabonds causés par les interférences électriques en courant continu et alternatif sur les surfaces extérieures des systèmes de conduites enterrées ou immergées.
Les autres effets des courants vagabonds, tels que la surchauffe et l'interférence avec les opérations de soudage, ne sont pas couverts par le présent document.
Le présent document fournit une brève description des effets des courants alternatifs, des principes généraux et des lignes directrices.
NOTE 1 Voir l'ISO 18086 concernant les effets des courants alternatifs sur les conduites enterrées ou immergées.
Les systèmes susceptibles également d'être affectés par des courants vagabonds comprennent les structures métalliques enterrées ou immergées telles que :
a) systèmes de conduites ;
b) câbles blindés ;
c) réservoirs et cuves ;
d) systèmes de mise à la terre ;
e) armement dans du béton ;
f) palplanches en acier.
Le présent document fournit des lignes directrices concernant :
— la conception des systèmes de protection cathodique susceptibles de produire des courants vagabonds ;
— la conception des systèmes de conduites, ou éléments des systèmes de conduites, enterrés ou immergés, et susceptibles d'être soumis à la corrosion par courant vagabond ; et
— le choix de mesures de protection ou d'atténuation appropriées.
Le présent document ne traite pas en détail des risques de corrosion interne due à des courants vagabonds, mais les mesures et principes qui y sont donnés sont applicables pour réduire au minimum les effets des interférences.
NOTE 2 L'impact des interférences électromagnétiques sur les parties annexes situées au-dessus du sol des systèmes de conduites est traité dans l'EN 50443, l'IEC 61140, l'IEC 60364-4-41, l'IEC 60479-1, l'IEC 60364-5-52, l'IEC/TS 61201 et l'IEC/TR 60479-5.
Le présent document peut également être utilisé pour des systèmes de conduites en dehors du champ des industries de la pétrochimie et du gaz naturel, ainsi que pour d'autres structures enterrées ou immergées.
NOTE 3 L'EN 50162 fournit des recommandations pour les structures ferroviaires.
Petrokemična industrija ter industrija za predelavo nafte in zemeljskega plina - Preprečevanje korozije na cevovodnih sistemih zaradi blodečih tokov (ISO 21857:2021)
General Information
Standards Content (Sample)
SLOVENSKI STANDARD
01-december-2021
Petrokemična industrija ter industrija za predelavo nafte in zemeljskega plina -
Preprečevanje korozije na cevovodnih sistemih zaradi blodečih tokov (ISO
21857:2021)
Petroleum, petrochemical and natural gas industries - Prevention of corrosion on pipeline
systems influenced by stray currents (ISO 21857:2021)
Erdöl-, petrochemische und Erdgasindustrie - Vermeidung von durch Streuströme
beeinflusster Korrosion an Rohrleitungssystemen (ISO 21857:2021)
Industries du pétrole, de la pétrochimie et du gaz naturel - Prévention de la corrosion sur
les systèmes de conduites soumis à l'influence de courants vagabonds (ISO
21857:2021)
Ta slovenski standard je istoveten z: EN ISO 21857:2021
ICS:
75.200 Oprema za skladiščenje Petroleum products and
nafte, naftnih proizvodov in natural gas handling
zemeljskega plina equipment
77.060 Korozija kovin Corrosion of metals
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
EN ISO 21857
EUROPEAN STANDARD
NORME EUROPÉENNE
October 2021
EUROPÄISCHE NORM
ICS 75.200
English Version
Petroleum, petrochemical and natural gas industries -
Prevention of corrosion on pipeline systems influenced by
stray currents (ISO 21857:2021)
Industries du pétrole, de la pétrochimie et du gaz Erdöl-, petrochemische und Erdgasindustrie -
naturel - Prévention de la corrosion sur les systèmes Vermeidung von durch Streuströme beeinflusster
de conduites soumis à l'influence de courants Korrosion an Rohrleitungssystemen (ISO 21857:2021)
vagabonds (ISO 21857:2021)
This European Standard was approved by CEN on 3 October 2021.
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
© 2021 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 21857:2021 E
worldwide for CEN national Members.
Contents Page
European foreword . 3
European foreword
The text of ISO 21857:2021 has been prepared by Technical Committee ISO/TC 67 "Materials,
equipment and offshore structures for petroleum, petrochemical and natural gas industries” of the
International Organization for Standardization (ISO) and has been taken over as EN ISO 21857:2021 by
Technical Committee CEN/TC 219 “Cathodic protection” the secretariat of which is held by BSI.
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 April 2022, and conflicting national standards shall be
withdrawn at the latest by April 2022.
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.
Any feedback and questions on this document should be directed to the users’ national standards body.
A complete listing of these bodies can be found on the CEN website.
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 21857:2021 has been approved by CEN as EN ISO 21857:2021 without any modification.
INTERNATIONAL ISO
STANDARD 21857
First edition
2021-03
Petroleum, petrochemical and
natural gas industries — Prevention
of corrosion on pipeline systems
influenced by stray currents
Industries du pétrole, de la pétrochimie et du gaz naturel —
Prévention de la corrosion sur les systèmes de conduites soumis à
l'influence de courants vagabonds
Reference number
ISO 21857:2021(E)
©
ISO 2021
ISO 21857:2021(E)
© ISO 2021
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
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Published in Switzerland
ii © ISO 2021 – All rights reserved
ISO 21857:2021(E)
Contents Page
Foreword .v
Introduction .vi
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 2
4 Abbreviations and symbols . 3
4.1 Abbreviations . 3
4.2 Symbols . 4
5 Information exchange and co-operation . 5
6 Common sources of interference that can affect corrosion . 6
6.1 General . 6
6.2 Direct current . 7
6.2.1 General. 7
6.2.2 Traction systems . 7
6.2.3 Industrial systems . 7
6.3 Alternating current. 7
6.3.1 General. 7
6.3.2 Overhead and buried power lines. 8
6.4 High-voltage direct current transmission systems . 8
6.5 Natural interference . 8
6.5.1 General. 8
6.5.2 Geomagnetic (telluric) interference . 8
6.5.3 Tidal interference effects . 9
7 Identification and measurement of stray current interference .9
7.1 Principle . 9
7.2 Stray Current interference .10
7.2.1 Inductive and conductive coupling from remote sources .10
7.2.2 Conductive coupling from nearby sources .10
7.3 Measurement of electrical parameters .10
7.3.1 Data acquisition systems .10
7.3.2 Possible errors in AC measurements .11
7.3.3 Potential measurement .11
7.3.4 Current measurement on probes .11
7.3.5 IR-free potential measurement on coupons or probes .11
7.3.6 Duration of the measurement .11
7.3.7 Specific requirements for coupons or probes.12
7.4 Corrosion rate measurement .12
8 Acceptance criteria for DC interference .12
8.1 Overview of criteria .12
8.2 Corrosion rate .13
8.3 Criteria for steel and cast iron .14
8.3.1 Time constant interference .14
8.3.2 Time variant interference .15
8.4 Criteria for steel pipes in concrete based on potential measurements without
cathodic protection .16
8.4.1 Time constant anodic interference .
...
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