ISO 18086:2019 pdf download

ISO 18086:2019 pdf download

ISO 18086:2019 pdf download.Corrosion of metals and alloys — Determination of AC corrosion — Protection criteria
1 Scope
This document specifies protection criteria for determining the AC corrosion risk of cathodically protected pipelines. It is applicable to buried cathodically protected pipelines that are 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. This document provides limits, measurement procedures, mitigation measures, and information to deal with long-term AC interference for AC voltages at frequencies between 16,7 Hz and 60 Hz and the evaluation of AC corrosion likelihood. This document deals with the possibility of AC corrosion of metallic pipelines due to AC interferences caused by conductive, inductive 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. This document does not cover the safety issues associated with AC voltages on pipelines. These are covered in national standards and regulations (see, e.g., EN 50443).
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 8044, Corrosion of metals and alloys — Basic terms and definitions
ISO 15589-1, Petroleum, petrochemical and natural gas industries — Cathodic protection of pipeline systems — Part 1: On-land pipelines
IEC 61010-1, Safety requirements for electrical equipment for measurement, control, and laboratory use —Part 1: General requirements
EN 50443, Effects of electromagnetic interference on pipelines caused by high voltage AC electric traction systems and/or high voltage AC power supply systems
4 Cathodic protection persons competence
Persons who undertake the design, supervision of installation, commissioning, supervision of operation, measurements, monitoring and supervision of the maintenance of cathodic protection systems shall have the appropriate level of competence for the tasks undertaken. EN 15257 or the NACE Cathodic Protection Training and Certification Programme constitute suitable methods of assessing and certifying the competence of cathodic protection personnel. The competence of cathodic protection persons to the appropriate level for tasks undertaken should be demonstrated by certification in accordance with prequalification procedures such as EN 15257, the NACE Cathodic Protection Training and Certification Programme, or any other equivalent scheme.