EN ISO 15589-1:2026

SLOVENSKI STANDARD
01-september-2026
Naftna in plinska industrija, vključno z nizkoogljično energijo - Katodna zaščita
cevovodov - 1. del: Cevovodi na kopnem (ISO 15589-1:2026)
Oil and gas industries including lower carbon energy - Cathodic protection of pipeline
transportation systems - Part 1: On-land pipelines (ISO 15589-1:2026)
Öl- und Gasindustrie einschließlich kohlenstoffarmer Energieträger - Kathodischer
Korrosionsschutz für Rohrleitungssysteme - Teil 1: Rohrleitungen an Land (ISO 15589-
1:2026)
Industries du pétrole et du gaz y compris les énergies à faible teneur en carbone -
Protection cathodique des systèmes de transport par conduites - Partie 1: Conduites
terrestres (ISO 15589-1:2026)
Ta slovenski standard je istoveten z: EN ISO 15589-1:2026
ICS:
75.200 Oprema za skladiščenje Petroleum products and
nafte, naftnih proizvodov in natural gas handling
zemeljskega plina equipment
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN ISO 15589-1
EUROPEAN STANDARD
NORME EUROPÉENNE
July 2026
EUROPÄISCHE NORM
ICS 75.200 Supersedes EN ISO 15589-1:2017
English Version
Oil and gas industries including lower carbon energy -
Cathodic protection of pipeline transportation systems -
Part 1: On-land pipelines (ISO 15589-1:2026)
Industries du pétrole et du gaz y compris les énergies à Öl- und Gasindustrie einschließlich kohlenstoffarmer
faible teneur en carbone - Protection cathodique des Energieträger - Kathodischer Korrosionsschutz für
systèmes de transport par conduites - Partie 1: Rohrleitungssysteme - Teil 1: Rohrleitungen an Land
Conduites terrestres (ISO 15589-1:2026) (ISO 15589-1:2026)
This European Standard was approved by CEN on 6 June 2026.

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, Türkiye 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
© 2026 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 15589-1:2026 E
worldwide for CEN national Members.

Contents Page
European foreword . 3

European foreword
This document (EN ISO 15589-1:2026) has been prepared by Technical Committee ISO/TC 67 "Oil and
gas industries including lower carbon energy" in collaboration with 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 January 2027, and conflicting national standards shall
be withdrawn at the latest by January 2027.
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.
This document supersedes EN ISO 15589-1:2017.
Any feedback and questions on this document should be directed to the users’ national standards
body/national committee. 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, Türkiye and the
United Kingdom.
Endorsement notice
The text of ISO 15589-1:2026 has been approved by CEN as EN ISO 15589-1:2026 without any
modification.
International
Standard
ISO 15589-1
Third edition
Oil and gas industries including
2026-07
lower carbon energy —
Cathodic protection of pipeline
transportation systems —
Part 1:
On-land pipelines
Industries du pétrole et du gaz y compris les énergies à faible
teneur en carbone — Protection cathodique des systèmes de
transport par conduites —
Partie 1: Conduites terrestres
Reference number
ISO 15589-1:2026(en) © ISO 2026

ISO 15589-1:2026(en)
© ISO 2026
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on
the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below
or ISO’s member body in the country of the requester.
ISO copyright office
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CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii
ISO 15589-1:2026(en)
Contents Page
Foreword .vi
Introduction .vii
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 2
4 Symbols and abbreviated terms. 5
4.1 Symbols .5
4.2 Abbreviated terms .6
5 Competence . 6
6 Cathodic protection criteria . 7
6.1 General .7
6.2 Protection potentials .7
6.3 Alternative assessment methods .9
6.3.1 100 mV cathodic potential shift .9
6.3.2 Current density and reference potential consideration .9
6.3.3 Other assessment methods .9
6.4 Criteria in the presence of AC interference .9
6.5 Criteria in the presence of fluctuating DC interference .9
7 Prerequisites for the application of cathodic protection . 9
7.1 General .9
7.2 Electrical continuity .10
7.3 Electrical isolation .10
7.3.1 General .10
7.3.2 Locations .11
7.3.3 Isolation joints .11
7.3.4 Internal corrosion risks at isolation joints and insulated flanges . 12
7.3.5 Contacts between metallic structures. 12
7.3.6 Electrical earthing systems . . 12
7.3.7 Lightning and overvoltage protection . 13
7.3.8 Overvoltage protection devices for DC isolation .14
7.4 Coating . 15
7.4.1 General . 15
7.4.2 Factory-applied coatings . 15
7.4.3 Field joint coatings . 15
7.4.4 Coating for trenchless pipelines .16
7.4.5 Air to electrolyte interface .16
7.4.6 Compatibility of coatings and wraps with cathodic protection .16
7.4.7 Thermal insulation .16
7.4.8 Reinforced concrete weight coating .17
7.5 Selection of pipe trench backfill material.17
7.6 Buried casings for pipelines .17
7.6.1 General .17
7.6.2 Casings that shield cathodic protection current .18
7.6.3 Casings that pass cathodic protection current .18
7.7 Equipment for the reduction of AC interference .18
7.8 Equipment for the mitigation of DC interference .19
8 Basic requirements and guidance for cathodic protection design . 19
8.1 General .19
8.2 Basic information for cathodic protection design .19
8.3 Contents of cathodic protection design report . 20
8.4 Cathodic protection current demand .21
8.4.1 Calculation of the theoretical total current demand .21

iii
ISO 15589-1:2026(en)
8.4.2 Current demand based on current density values for coated pipelines . 22
8.5 Cathodic protection equipment . 23
8.5.1 Cathodic protection cables . 23
8.5.2 Cable connection to pipeline .24
8.5.3 Distribution boxes and test stations . 25
8.6 Temporary protection . 26
8.7 Specific case of existing pipelines . 26
8.7.1 General . 26
8.7.2 Parallel pipelines . 26
8.7.3 Parallelism or crossing with AC power systems .27
8.8 Trenchless installation methods .27
9 Impressed current stations .28
9.1 General . 28
9.2 Power supply . 28
9.3 Ground beds . 29
9.3.1 General . 29
9.3.2 Deep-well ground beds . 29
9.3.3 Shallow ground beds . 30
9.3.4 Impressed-current anodes and conductive backfill . 30
9.4 Output control .32
9.4.1 General .32
9.4.2 Current distribution for multiple pipelines .32
9.4.3 Potential control .32
10 Galvanic anode systems .33
10.1 General . 33
10.2 Design requirements . 33
10.3 Zinc anodes . 34
10.4 Magnesium anodes . 35
10.5 Design of the anode system. 35
10.6 Anode backfill.37
10.7 Cables and cable connections .37
10.8 Anode installation .37
11 Monitoring facilities .37
11.1 General .37
11.2 Locations of test stations .37
11.3 Description of test stations . 38
11.4 Use of probes and coupons . 38
11.5 Bonding to other pipelines . 39
11.6 Test facilities at metallic cased crossings . 39
11.7 Test facilities at isolation joints . 39
11.8 Line current monitoring test stations . 39
11.9 Drain-point test facilities . 39
11.10 Miscellaneous monitoring facilities . 40
12 Commissioning.40
12.1 General . 40
12.2 Preliminary tests . . 40
12.3 Start-up .41
12.3.1 Impressed current stations .41
12.3.2 Galvanic anodes .42
12.3.3 Drainage stations .42
12.3.4 Test stations.42
12.4 Verification of cathodic protection effectiveness .43
12.4.1 General .43
12.4.2 Measurements of DC potential and AC voltage .43
12.4.3 Current measurements .43
12.4.4 Adjustments .43
12.5 Commissioning report . 44

iv
ISO 15589-1:2026(en)
12.5.1 Installation documentation . 44
12.5.2 Commissioning data and information . 44
13 Monitoring, inspection and maintenance .45
13.1 General .45
13.2 Implementation of inspection .45
13.3 Inspection intervals . 46
13.4 Remote monitoring . 48
13.5 Specialized surveys . 48
13.6 Monitoring plan . 48
13.7 Measuring equipment . 49
13.8 Maintenance and repair . 49
14 Documentation .50
14.1 Design documentation . 50
14.1.1 General . 50
14.1.2 Construction details and installation procedures . 50
14.2 Commissioning documentation . .51
14.3 Operating and maintenance documentation .51
14.3.1 General .51
14.3.2 Inspection and monitoring data .52
14.3.3 Maintenance records .52
Annex A (normative) Cathodic protection measurements .53
Annex B (normative) Electrical interference . 61
Annex C (informative) Fault detection of impressed-current systems during operation .65
Annex D (informative) Description of specialized surveys . 67
Annex E (informative) Calculation of the CP potential attenuation . 74
Annex F (informative) Electrical tests for isolation joints before installation .79
Annex G (informative) Internal corrosion at insulating flange .80
Bibliography .83

v
ISO 15589-1:2026(en)
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards is normally carried out through
ISO technical committees. Each member body interested in a subject for which a technical committee
has been established has the right to be represented on that committee. International organizations,
governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely
with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.
The procedures used to develop this document and those intended for its further maintenance are described
in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the different types
of ISO document should be noted. This document was drafted in accordance with the editorial rules of the
ISO/IEC Directives, Part 2 (see www.iso.org/directives).
ISO draws attention to the possibility that the implementation of this document may involve the use of (a)
patent(s). ISO takes no position concerning the evidence, validity or applicability of any claimed patent
rights in respect thereof. As of the date of publication of this document, ISO had not received notice of (a)
patent(s) which may be required to implement this document. However, implementers are cautioned that
this may not represent the latest information, which may be obtained from the patent database available at
www.iso.org/patents. ISO shall not be held responsible for identifying any or all such patent rights.
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and expressions
related to conformity assessment, as well as information about ISO's adherence to the World Trade
Organization (WTO) principles in the Technical Barriers to Trade (TBT), see www.iso.org/iso/foreword.html.
This document was prepared by Technical Committee ISO/TC 67, Oil and gas industries including lower carbon
energy, Subcommittee SC 2, Pipeline transportation systems, in collaboration with the European Committee
for Standardization (CEN) Technical Committee CEN/TC 219, Cathodic protection, in accordance with the
Agreement on technical cooperation between ISO and CEN (Vienna Agreement).
This third edition cancels and replaces the second edition (ISO 15589-1:2015), which has been technically
revised.
The main changes are as follows:
— cathodic protection criteria have been extended with further clarification on the application of the
criteria;
— requirements for design have been more detailed; periodicities for inspection of cathodic equipment
have been enlarged; and the option for remote monitoring has been added;
— requirements for measurements and testing during commissioning have been further detailed.
A list of all parts in the ISO 15589 series can be found on the ISO website.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www.iso.org/members.html.

vi
ISO 15589-1:2026(en)
Introduction
Pipeline cathodic protection is achieved by the supply of sufficient direct current to the external pipe
surface, so that the steel-to-electrolyte potential is lowered to values at which external corrosion is reduced
to an insignificant rate.
Cathodic protection is normally used in combination with a suitable protective coating system to protect
the external surfaces of steel pipelines from corrosion.

vii
International Standard ISO 15589-1:2026(en)
Oil and gas industries including lower carbon energy —
Cathodic protection of pipeline transportation systems —
Part 1:
On-land pipelines
1 Scope
This document specifies requirements and gives recommendations for the pre-installation surveys, design,
materials, equipment, installation, commissioning, operation, inspection, and maintenance of cathodic
protection systems for the external surface of on-land pipelines.
This document is applicable to on-land pipelines and piping systems used in other industries and
transporting other media such as industrial gases, waters, or slurries.
Throughout this document, on-land pipelines mean:
— pipelines that are buried;
— landfalls of offshore pipeline sections protected by onshore based cathodic protection installations;
— immersed sections of on-land pipelines such as river or lake crossings.
This document is applicable to pipelines of carbon steel, stainless steel, cast iron, galvanized steel, and
copper.
This document does not apply to pipelines made of reinforced concrete (see ISO 12696).
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 — Vocabulary
ISO 10012, Measurement management systems — Requirements for measurement processes and measuring
equipment
ISO 13623, Petroleum and natural gas industries — Pipeline transportation systems
ISO 13847, Petroleum and natural gas industries — Pipeline transportation systems — Welding of pipelines
ISO 21809-3, Oil and gas industries including lower carbon energy — External coatings for buried or submerged
pipelines used in pipeline transportation systems — Part 3: Field joint coatings
ISO 21809-5, Oil and gas industries including lower carbon energy — External coatings for buried or submerged
pipelines used in pipeline transportation systems — Part 5: External concrete coatings
ISO 21857, Petroleum, petrochemical and natural gas industries — Prevention of corrosion on pipeline systems
influenced by stray currents
IEC 60079-10-1, Explosive atmospheres — Part 10-1: Classification of areas — Explosive gas atmospheres

ISO 15589-1:2026(en)
IEC 60529, Degrees of protection provided by enclosures (IP Code)
IEC 62561-3, Lightning protection system components (LPSC) - Part 3: Requirements for isolating spark gaps
(ISGs)
EN 1594, Gas infrastructure — Pipelines for maximum operating pressure over 16 bar — Functional
requirements
EN 12007-3, Gas infrastructure — Pipelines for maximum operating pressure up to and including 16 bar – Part
3: Specific functional recommendations for steel
EN 14161, Petroleum and natural gas industries — Pipeline transportation systems from 2011+A1 from 2015
(ISO 13623:2017)
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 8044 and the following apply.
ISO and IEC maintain terminology databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at https:// www .electropedia .org/
3.1
anode backfill
added material immediately surrounding a buried anode
3.2
bond
conductor connecting two points on the same structure or between different structures
3.3
cathodic protection system
impressed current and galvanic anode system consisting of all the equipment necessary for the application
of cathodic protection, such as impressed current installations, power supplies, impressed current anodes
(3.12), galvanic anodes, monitoring facilities, bonds (3.2) and cables
3.4
coupon
metal sample of defined surface area and thickness made of a metal equivalent to the metal of the pipeline
3.5
coating defect
anomaly in the coating that results in the steel surface making direct contact with the surrounding
electrolyte
3.6
DC decoupling device
direct current decoupling device
equipment that provides a low-impedance path for alternating current and high resistance for direct current
EXAMPLE Polarization cells, capacitors, or diode assemblies.
3.7
drain point
location of the cable connection to the protected pipeline through which the protective current returns to
its source
ISO 15589-1:2026(en)
3.8
drainage
transfer of stray current (3.24) between structures by means of a deliberate bond (3.2)
Note 1 to entry: See ISO 21857 for drainage devices (direct drainage bond, resistance drainage bond, unidirectional
drainage bond and forced drainage bond).
3.9
drainage station
equipment and materials required to provide drainage (3.8) of stray currents (3.24) from affected systems
3.10
galvanic anode station
equipment and materials required to provide cathodic protection by the use of galvanic anodes
Note 1 to entry: Such materials and equipment include galvanic anodes and cables.
3.11
ground bed
system of buried or immersed anodes
3.12
impressed current anode
electrode that delivers cathodic protection current in combination with an impressed current station (3.13)
3.13
impressed current station
equipment and materials required to provide cathodic protection by impressed current
Note 1 to entry: Such materials and equipment include impressed current anodes (3.12), cables, and a DC source.
3.14
IR drop
voltage that is the product of all currents flowing through the cathodic protection circuit and the resistance
of the current path (mainly the electrolyte and the pipeline)
Note 1 to entry: This is derived from Ohm’s law (U = I × R).
3.15
IR free potential
polarized potential
coating defect (3.5) or coupon (3.4) to electrolyte potential without the voltage error caused by the IR drop
(3.14) due to the protection current or any other current
3.16
isolation joint
electrically insulating component inserted between two lengths of pipe to prevent electrical continuity
between them
EXAMPLE Monobloc isolation joint, insulated flange.
3.17
spark gap
component with discharge distance for isolating electrically conductive installation sections
Note 1 to entry: In the event of lightning strike, the installation sections are temporarily connected conductively as
the result of response of the discharge.
3.18
local earth
conductive mass of the electrolyte, whose voltage between two reference electrodes at any point is not equal
to zero
ISO 15589-1:2026(en)
3.19
measuring point
location where the actual potential measurement takes place
Note 1 to entry: In the case of pipe-to-electrolyte potential measurement, th
...