I.S. EN ISO 21857:2021
Current
The latest, up-to-date edition.
Petroleum, petrochemical and natural gas industries - Prevention of corrosion on pipeline systems influenced by stray currents (ISO 21857:2021)
Hardcopy , PDF
English
31-10-2021
For Harmonized Standards, check the EU site to confirm that the Standard is cited in the Official Journal.
Only cited Standards give presumption of conformance to New Approach Directives/Regulations.
Dates of withdrawal of national standards are available from NSAI.
Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Abbreviations and symbols
5 Information exchange and co-operation
6 Common sources of interference that can affect corrosion
7 Identification and measurement of stray current interference
8 Acceptance criteria for DC interference
9 Reduction of DC stray current interference
10 Modifications to the interfered structure
11 Inspection and maintenance
Annex A (informative) Use of current probes to evaluate fluctuating stray current interference on cathodically protected structures
Annex B (informative) Determining the relevant position for placing reference electrodes, coupons and probes in case of any conductive coupling caused by stray currents
Annex C (informative) Operating principles of electrical resistance probes
Annex D (informative) Geomagnetic interference
Annex E (informative) High voltage direct current interference
Annex F (informative) Alternating Current Interference
Annex G (informative) Tidal Effects
Annex H (informative) Photovoltaic interference
Annex I (informative) Modelling the effects of stray current interference on cathodically protected pipelines
Annex J (informative) Assessment of the corrosion risk for steel in concrete or for cathodically protected structures under time variant interference conditions
Annex K (informative) Principles of anodic and cathodic interference
Bibliography
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