NF ISO 18086

NF ISO 18086

August 2015
Standard Cancelled

Corrosion of metals and alloys - Determination of AC corrosion - Protection criteria

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.

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Main informations

Collections

National standards and national normative documents

Publication date

August 2015

Number of pages

44 p.

Reference

NF ISO 18086

ICS Codes

77.060   Corrosion of metals

Classification index

A05-130

Print number

1

International kinship

Sumary
Corrosion of metals and alloys - Determination of AC corrosion - Protection criteria

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.

Standard replaced by (1)
NF EN ISO 18086
September 2017
Standard Cancelled
Corrosion of metals and alloys - Determination of AC corrosion - Protection criteria

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.

Table of contents
  • 1 Domaine d'application
  • 2 Références normatives
  • 3 Termes et définitions
  • 4 Compétences du personnel en matière de protection cathodique
  • 5 Évaluation de l'influence due aux courants alternatifs
  • 6 Évaluation du risque de corrosion due aux courants alternatifs
  • 7 Niveaux d'influence acceptables
  • 8 Techniques de mesurage
  • 9 Mesures d'atténuation
  • 10 Mise en service
  • 11 Surveillance et maintenance
  • Annexe A Description simplifiée du phénomène de corrosion due aux courants alternatifs
  • Annexe B Témoins et sondes
  • Annexe C Oxydation coulométrique
  • Annexe D Influence des caractéristiques du sol sur le processus de corrosion due aux courants alternatifs
  • Annexe E Autres critères utilisés en présence d'une influence par un courant alternatif
  • Annexe F Paramètres à prendre en compte pour choisir un dispositif de découplage du courant continu
  • Annexe G Méthode de détermination de l'emplacement d'une électrode de référence par rapport à la terre lointaine
  • Annexe H Mesurage simultané sur un témoin des densités de courant à une fréquence élevée
  • Bibliographie
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