ISO 16674:2025
(Main)Corrosion control engineering life cycle of power transmission and transformation systems — General requirements
Corrosion control engineering life cycle of power transmission and transformation systems — General requirements
This document specifies the general requirements for various factors in the corrosion control engineering throughout the life cycle of equipment and devices of power transmission and transformation systems. This document is applicable to the corrosion control engineering of power transmission and transformation systems.
Titre manque
General Information
Standards Content (Sample)
International
Standard
ISO 16674
First edition
Corrosion control engineering life
2025-06
cycle of power transmission and
transformation systems — General
requirements
Reference number
© ISO 2025
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ii
Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 General principles . 2
5 Objective . 2
6 Corrosion source . 2
7 Materials . 3
8 Technology . 5
9 Design . 6
10 Development . 8
11 Manufacturing . 9
12 Transportation and storage . 9
13 Construction and installation . 9
14 Commissioning and acceptance . 10
15 Testing and inspection .11
16 Operation .11
17 Maintenance and repair .12
18 Life extension and scrap .13
19 Documents and records . 14
20 Resource management . 14
21 Comprehensive assessment . 14
Annex A (informative) Example of a transmission and transformation systems .15
Annex B (informative) Example of a corrosion control engineering life cycle of power
transmission and transformation systems .16
Bibliography . 17
iii
Foreword
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This document was prepared by Technical Committee ISO/TC 156, Corrosion of metals and alloys,
Subcommittee SC 1, Corrosion control engineering life cycle.
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International Standard ISO 16674:2025(en)
Corrosion control engineering life cycle of power
transmission and transformation systems — General
requirements
1 Scope
This document specifies the general requirements for various factors in the corrosion control engineering
throughout the life cycle of equipment and devices of power transmission and transformation systems.
This document is applicable to the corrosion control engineering of power transmission and transformation
systems.
2 Normative references
There are no normative references in this document.
3 Terms and definitions
For the purposes of this document, the following terms and definitions 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
power transmission and transformation systems
combination of all devices and equipment for transmission and transformation in power systems
3.2
corrosion control engineering life cycle of power transmission and transformation systems
entire process of corrosion control engineering for power transmission and transformation systems (3.1) from
target setting to disposal and scrapping
3.3
life extension
measures taken to extend the service life of corrosion control engineering
3.4
corrosion database
collection dedicated to storing and managing data and information related to corrosion
3.5
map of corrosivity classification
maps that describe the corrosivity categories of specific environments towards metal materials in a certain
region during a given period
EXAMPLE 1 Atmospheric corrosivity classification maps.
EXAMPLE 2 Soil corrosivity classification maps.
4 General principles
4.1 This document specifies all factors in the corrosion control engineering life cycle of power transmission
and transformation systems. This includes the objectives, corrosion sources, materials, technology, design,
development, manufacturing, transportation and storage, construction and installation, testing and
inspection, operation, maintenance and repair, life extension and scrap, documents and records, resource
management, comprehensive assessment.
4.2 The transmission and transformation systems specified in this document include devices and
equipment that realize the functions of power transmission and transformation (as shown in Annex A). The
transmission system mainly includes overhead transmission lines, towers, grounding devices and auxiliary
equipment such as fittings. The transformation system mainly includes substations, converter stations,
primarily comprising transformers, switchgear, grounding devices, support structures and other ancillary
equipment.
4.3 The principles of integrity, systematicity, mutual coordination and optimization should be met
among the requirements of all the factors specified in the corrosion control engineering life cycle of power
transmission and transformation systems.
4.4 The corrosion control management system (as shown in Annex B) should be established to achieve
comprehensive control and continuous improvement of corrosion in transmission and transformation system.
4.5 The corrosion control management organization should be established. This includes the owner,
technical management team, operation team, maintenance team and the responsibilities and authorities of
personnel should be clearly defined.
5 Objective
5.1 The overall objectives of this document are to effectively control corrosion in power transmission and
transformation systems, eliminate or reduce corrosion damage, ensure these systems are safe, economical
and long lasting and protect the environment.
5.2 These objectives should be broken down into all factors or components in the life cycle of a transmission
and transformation system. Implementation should be dynamically evaluated and adjusted to ensure that
the overall objective is implemented.
6 Corrosion source
6.1 The procedure for investigating, identifying and analysing corrosion sources of the life cycle of
power transformation and transmission systems should be established. According to this procedure, the
corresponding corrosion sources should be comprehensively, accurately and specifically determined.
6.2 The corrosion sources of power transformation and transmission systems are as follows:
a) Internal corrosion sources in the atmospheric environment for above-ground equipment in power
transmission lines, substations and converter stations include water, oxygen and atmospheric
pollutants. External corrosion sources include temperature, rainfall, light exposure, wind speed, wind
direction and other factors.
b) Internal corrosion sources for grounding materials in power transmission lines, pole and tower
foundations, underground cables and buried equipment of substations and converter stations include
soil and groundwater. External corrosion sources include stray currents.
c) New corrosion sources during the operation of power transmission and transformation systems include
electric and magnetic fields that can cause or promote corrosion, high temperature caused by current,
destructive detection of coatings, improper operation and maintenance, wear and aging.
6.3 It is recommended to establish a corrosion source database for the corrosion sources involved at
diff
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