EN ISO 18086:2017
(Main)Corrosion of metals and alloys - Determination of AC corrosion - Protection criteria (ISO 18086:2015)
Corrosion of metals and alloys - Determination of AC corrosion - Protection criteria (ISO 18086:2015)
ISO 18086:2015 is applicable to buried cathodically-protected pipeline that is influenced by AC traction systems and/or AC power lines.
In the presence of AC interference, the protection criteria given in ISO 15589 1 are not sufficient to demonstrate that the steel is being protected against corrosion.
ISO 18086:2015 provides limits, measurement procedures, mitigation measures, and information to deal with long term AC interference for AC voltages at frequencies between 16,7 and 60 Hz and the evaluation of AC corrosion likelihood.
It deals with the possibility of AC corrosion of metallic pipelines due to AC interferences caused by inductive, conductive or capacitive coupling with AC power systems and the maximum tolerable limits of these interference effects. It takes into account the fact that this is a long-term effect, which occurs during normal operating conditions of the AC power system.
It does not cover the safety issues associated with AC voltages on pipelines. These are covered in national standards and regulations.
Korrosion von Metallen und Legierungen - Bestimmung der Wechselstromkorrosion - Schutzkriterien (ISO 18086:2015)
Corrosion des métaux et alliages - Détermination de la corrosion occasionnée par les courants alternatifs - Critères de protection (ISO 18086:2015)
L'ISO 18086:2015 est applicable aux canalisations enterrées qui sont protégées cathodiquement et influencées par des systèmes de traction à courant alternatif et/ou des lignes électriques haute tension en courant alternatif.
En présence d'une influence due aux courants alternatifs, les critères de protection spécifiés dans l'ISO 15589 1 sont insuffisants pour démontrer que l'acier est protégé contre la corrosion.
L'ISO 18086:2015 spécifie les limites, les modes opératoires de mesurage, les mesures d'atténuation et les informations relatives à l'influence en régime de fonctionnement permanent des courants alternatifs pour les tensions de courant alternatif à des fréquences comprises entre 16,7 Hz et 60 Hz et à l'évaluation du risque de corrosion engendré par ces courants.
Elle traite de la possible corrosion des canalisations métalliques due à l'influence des courants alternatifs provoquée par le couplage inductif, conductif ou capacitif avec des systèmes à courant alternatif, ainsi que des limites maximales admissibles des effets de cette influence. Elle prend en compte le fait qu'il s'agit d'un effet à long terme qui se produit uniquement lors de conditions normales d'exploitation du système électrique à courant alternatif.
Elle ne traite pas des problèmes de sécurité liés aux tensions de courant alternatif sur les canalisations. Ceux-ci sont traités dans les normes et réglementations nationales.
Korozija kovin in zlitin - Ugotavljanje nastanka AC korozije - Merila zaščite (ISO 18086:2015)
Standard ISO 18086:2015 se uporablja za vkopane katodno zaščitene cevovode pod vplivom izmeničnih vlečnih sistemov in/ali izmeničnih napajalnih vodov.
Če je prisotna izmenična motnja, merila zaščite, podana v standardu ISO 15589 1, ne zadostujejo kot dokaz, da je jeklo zaščiteno pred korozijo.
Standard ISO 18086:2015 določa omejitve, merilne postopke, ukrepe za ublažitev in informacije za obravnavo dolgoročne izmenične motnje za izmenične napetosti s frekvenco 16,7–60 Hz ter oceno verjetnosti nastanka korozije.
Obravnava verjetnost nastanka AC korozije kovinskih cevovodov zaradi izmeničnih motenj, ki jih povzroča induktivni, konduktivni ali kapacitivni sklop s sistemom za izmenično napajanje, in največje sprejemljive omejitve vplivov teh motenj. Upošteva, da gre za dolgoročni vpliv, do katerega pride med običajnimi delovnimi pogoji sistema za izmenično napajanje.
Standard ne zajema varnostnih vprašanj v zvezi z izmenično napetostjo v cevovodih. Varnostna vprašanja obravnavajo nacionalni standardi in predpisi.
General Information
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Standards Content (Sample)
SLOVENSKI STANDARD
01-november-2017
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Corrosion of metals and alloys - Determination of AC corrosion - Protection criteria (ISO
18086:2015)
Korrosion von Metallen und Legierungen - Bestimmung der Wechselstromkorrosion -
Schutzkriterien (ISO 18086:2015)
Corrosion des métaux et alliages - Détermination de la corrosion occasionnée par les
courants alternatifs - Critères de protection (ISO 18086:2015)
Ta slovenski standard je istoveten z: EN ISO 18086:2017
ICS:
77.060 Korozija kovin Corrosion of metals
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
EN ISO 18086
EUROPEAN STANDARD
NORME EUROPÉENNE
September 2017
EUROPÄISCHE NORM
ICS 77.060
English Version
Corrosion of metals and alloys - Determination of AC
corrosion - Protection criteria (ISO 18086:2015)
Corrosion des métaux et alliages - Détermination de la Korrosion von Metallen und Legierungen -
corrosion occasionnée par les courants alternatifs - Bestimmung der Wechselstromkorrosion -
Critères de protection (ISO 18086:2015) Schutzkriterien (ISO 18086:2015)
This European Standard was approved by CEN on 23 August 2017.
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: Avenue Marnix 17, B-1000 Brussels
© 2017 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 18086:2017 E
worldwide for CEN national Members.
Contents Page
European foreword . 3
European foreword
The text of ISO 18086:2015 has been prepared by Technical Committee ISO/TC 156“Corrosion of
metals and alloys” of the International Organization for Standardization (ISO) and has been taken over
as EN ISO 18086:2017 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 March 2018, and conflicting national standards shall
be withdrawn at the latest by March 2018.
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, 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 18086:2015 has been approved by CEN as EN ISO 18086:2017 without any modification.
INTERNATIONAL ISO
STANDARD 18086
First edition
2015-06-01
Corrosion of metals and alloys —
Determination of AC corrosion —
Protection criteria
Corrosion des métaux et alliages — Détermination de la corrosion
occasionnée par les courants alternatifs — Critères de protection
Reference number
ISO 18086:2015(E)
©
ISO 2015
ISO 18086:2015(E)
© ISO 2015, Published in Switzerland
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ISO 18086:2015(E)
Contents Page
Foreword .v
Introduction .vi
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Cathodic protection persons competence . 4
5 Assessment of the AC influence . 5
5.1 General . 5
5.2 Assessment of the level of interference . 5
6 Evaluation of the AC corrosion likelihood. 6
6.1 Prerequisite . 6
6.1.1 General. 6
6.1.2 AC voltage on the structure . 6
6.2 AC and DC current density . 7
6.2.1 General. 7
6.2.2 AC current density . 7
6.2.3 High cathodic DC current density . 7
6.2.4 Low cathodic DC current density . 7
6.2.5 Current ratio “I /I ” . 8
a.c. d.c
6.2.6 Soil resistivity . 8
6.3 Corrosion rate . 8
6.4 Pipeline coatings . 8
6.5 Evaluation of the metal loss . 8
7 Acceptable interference levels . 8
8 Measurement techniques . 9
8.1 Measurements . 9
8.1.1 General. 9
8.1.2 Selection of test sites . 9
8.1.3 Selection of measurement parameter .10
8.1.4 Sampling rate for the recording of interference levels .10
8.1.5 Accuracy of measuring equipment.10
8.1.6 Installation of coupons or probes to calculate current densities.10
8.2 DC potential measurements .10
8.3 AC voltage measurements .10
8.4 Measurements on coupons and probes .11
8.4.1 Installation of coupons or probes .11
8.4.2 Current measurements.11
8.4.3 Corrosion rate measurements.12
8.5 Pipeline metal loss techniques .13
9 Mitigation measures .13
9.1 General .13
9.2 Construction measures .13
9.2.1 Modification of bedding material .13
9.2.2 Installation of isolating joints .13
9.2.3 Installation of mitigation wires .13
9.2.4 Optimization of pipeline and/or powerline route .14
9.2.5 Power line or pipeline construction.14
9.3 Operation measures .14
9.3.1 Earthing .
...
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