ISO 23221:2020

FINAL
INTERNATIONAL ISO/FDIS
DRAFT
STANDARD 23221
ISO/TC 156/SC 1
Pipeline corrosion control
Secretariat: SAC
engineering life cycle — General
Voting begins on:
2020­09­07 requirements
Voting terminates on:
2020­11­02
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ISO/FDIS 23221:2020(E)
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©
NATIONAL REGULATIONS. ISO 2020

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ISO/FDIS 23221:2020(E)

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© ISO 2020
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ISO/FDIS 23221:2020(E)

Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 General principles . 1
5 Objectives . 2
6 Corrosion sources . 2
7 Pipeline materials . 2
8 Technology . 3
9 Design . 4
10 Research and development . 4
11 Manufacturing . 5
12 Construction and installation . 5
13 Handling, storage and transportation. 6
14 Commissioning . 6
15 Acceptance inspection . 7
16 Operation . 8
17 Maintenance . 9
18 Repair . 9
19 Decommissioning, abandonment and disposal .10
20 Documents and records .11
21 Resource management .11
22 Comprehensive assessment .11
Bibliography .12
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ISO/FDIS 23221:2020(E)

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
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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 documents should be noted. This document was drafted in accordance with the
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Attention is drawn to the possibility that some of the elements of this document may be the subject of
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iso/ foreword .html.
This document was prepared by Technical Committee ISO/TC 156, Corrosion of metals and alloys,
Subcommittee SC 1, Corrosion control engineering life cycle.
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.
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FINAL DRAFT INTERNATIONAL STANDARD ISO/FDIS 23221:2020(E)
Pipeline corrosion control engineering life cycle — General
requirements
1 Scope
This document specifies the general requirements for control elements in the life cycle of pipeline
corrosion control engineering.
This document is applicable to all types of pipeline corrosion control engineering programmes.
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 terminological databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at http:// www .electropedia .org/
3.1
pipeline corrosion testing and monitoring system
online technology for the real-time testing and feedback of corrosion conditions on both external and
internal pipelines
3.2
temporary decommissioning
suspended operation of a system due to emergencies (such as natural disasters, corrosion leakage, etc.)
Note 1 to entry: The decommissioning system will continue to operate after the emergency measures are taken.
3.3
permanent decommissioning
permanent shutdown of a system
Note 1 to entry: The system has been assessed to have significant technical and economic risks via rigorous
procedures and will no longer continue to operate.
4 General principles
4.1 This document summarizes all the aspects of the pipeline corrosion control engineering life cycle
to provide general requirements for selecting technical and management standards. This document does
not provide specific techniques and management procedures for pipeline corrosion control.
4.2 A traceable and supportive management system shall be established to achieve full control and
sustainable improvement on all aspects of the pipeline corrosion control engineering life cycle.
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ISO/FDIS 23221:2020(E)

5 Objectives
5.1 To optimize and coordinate all aspects of the pipeline corrosion control engineering life cycle, the
life cycle of pipeline corrosion control engineering shall be suitable for the full life cycle of the protected
pipeline.
5.2 The objectives of corrosion control engineering shall be communicated, implemented and
maintained at all stages of the pipeline life cycle. The objectives shall be regularly reviewed and improved
to ensure their suitability.
6 Corrosion sources
6.1 Corrosion sources include:
a) internal corrosion sources, including, but not limited to, pipeline transmission medium, flow rate,
temperature and pressure;
b) external corrosion sources, including, but not limited to, environmental factors and corrosive
medium that potentially reacts with pipes under different environmental conditions;
c) new corrosion sources during pipeline operation, including, but not limited to, cathodic disbondment
and pipeline maintenance­related and replacement­related electrochemical corrosion;
d) corrosion sources caused by working conditions changes, including working conditions changes in
both pipeline and pipeline corrosion control facilities.
EXAMPLE Cathodic disbondment caused by a current overload of cathodic protection.
6.2 By referring to the implementation cases and relevant standards, all corrosion sources shall be
accurately identified according to the life cycle requirements of the pipeline system.
NOTE 1 For corrosion sources of pipelines in atmospheres, refer to ISO 9223.
NOTE 2 For corrosion sources of buried pipelines, refer to EN 12501-1.
7 Pipeline materials
7.1 The selection of a pipeline shall be based on the corresponding standards.
NOTE For the selection of a pipeline in petroleum and natural gas industries, refer to ISO 13623.
7.2 The following pipeline selection principles shall be fulfilled.
a) The selected pipeline and its applied environment shall be investigated to ensure corrosion
resistance as well as environmental protection.
b) Once the application requirements are satisfied, the processability, versatility and cost-
effectiveness of the pipeline shall also be considered.
7.3 The pipeline shall be selected using the following procedures.
a) A field investigation on the pipeline working environment shall be carried out to determine
corrosion sources, corrosion factors and corrosion magnitude.
b) With reference to corresponding standards and manuals, an appropriate pipeline that meets the
corrosion resistance requirements shall be selected.
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c) The pipeline resistance shall be evaluated. In the absence of relevant data for the same or a similar
engineering application, a laboratory simulation or field test is required for the pipeline selection.
d) When a satisfactory durability of the pipeline operation has been achieved, versatility shall be
considered next. It shall take precedence over cost-effectiveness.
7.4 The selected pipeline shall be reviewed and assessed by established procedures. The process of
pipeline selection shall be documented and archived.
8 Technology
8.1 One or more appropriate technologies shall be implemented for pipeline corrosion control
according to the corrosion sources. Considerations of pipeline corrosion control technologies include,
but are not limited to, the following.
a) Reasonable structure design: insulation techniques, the installation of electrical isolation points
and isolation devices, a detailed integrated plan of sleeve, facilities and other electrical affected
zones, and the prevention of unpredicted corrosion, such as shielding of cathodic protection or
cathodic disbondment.
b) Coating protection: selecting coatings materials suitable to the expected operating conditions and
construction process, taking into account budgetary and environmental considerations.
c) Electrochemical protection: evaluating the current density required to resist corrosion via pipeline
polarization or the current flow required for the cathodic protection system, taking total electricity
costs into consideration.
d) Corrosion inhibitor selection: fully investigating the cause of the internal corrosion and the
chemical property of the pipeline transmission medium to select the inhibitor type, frequency and
dose, taking into account the total cost of the use of corrosion inhibitors, if applicable.
e) Cleaning, including chemical and physical cleaning. The type and amount of pollutants pigged from
the pipeline shall be analysed to detect the inhibiting effect and to determine the required pigging
frequency.
f) Environmental protection: environmental-friendly pipeline corrosion control technology and
construction technology shall be preferred.
g) Composite technology: composite pipeline technology without electrochemical corrosion shall be
preferred.
8.2 The selection of pipeline corrosion control technology shall be based on the corresponding
technical standards or specifications followed by a comprehensive evaluation. The general principles are
as follows.
a) Considering the safety of the corrosion control process operation as a priority and evaluating
whether safety requirements can be met.
b) In cases where all the technical requirements have been met, state-of-the-art technology, process,
equipment and materials shall be selected preferentially, while minimizing the costs of corrosion
control.
c) The selected pipeline corrosion control engineering technology shall meet the operating
requirements for different working conditions as well as have a sufficient service life without
generating pollutants.
d) The risk and associated hazards of a pipeline corrosion control technical failure shall be considered.
Pre-controls are required to decrease risks and minimize potential losses from technical failures.
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NOTE For techniques of risk management, refer to ISO 31000.
8.3 The selected technologies shall have corresponding supportive cases as references. Otherwise,
they shall be verified by appropriate experiments.
8.4 When the requirements of the pipeline system have been met, the selected technologies shall be
coordinated and optimized with other aspects in the pipeline corrosion control system to achieve the
goals of safety, cost-effectiveness, and long-term and environmental-friendly operation.
8.5 All adopted corrosion control technologies shall be reviewed and evaluated via established
procedures, then documented and archived.
9 Design
9.1 All elements, links and nodes in the entire life cycle of the pipeline corrosion control engineering
shall be systematically designed according to the influence of the pipeline operating environment and
transmission medium.
9.2 The principles of pipeline corrosion control engineering design are as follows.
a) Protect the environment and save energy.
b) The site of the pipeline engineering shall avoid environments with interference factors, such as
populated regions, highways, railways, rivers and power lines. The appropriate distance between
the pipeline and such environments shall be kept. The physical space occupied by pipeline
infrastructure shall not be exploited for other purposes.
c) Optimize the design with key materials, facilities and processes according to specific corrosive
environments. Determine the most cost­effective design.
d) It is acceptable to use state­of­the­art technologies, processes, facilities and materials.
e) Pipeline corrosion control engineering design for reconstruction and extension projects shall
rationally use the original facilities.
f) It is acceptable that the expected life cycle of serviceable or replaceable materials and devices
are shorter than the life cycle of the pipeline. The life cycle of unserviceable and unreplaceable
materials and devices shall be consistent with the life cycle of the protected pipeline.
9.3 A green plan for temporary and permanent decommissioning, abandonment and disposal shall be
developed in the stage of design.
9.4
...