ISO/TS 12747:2011

TECHNICAL ISO/TS
SPECIFICATION 12747
First edition
2011-04-15
Petroleum and natural gas industries —
Pipeline transportation systems —
Recommended practice for pipeline life
extension
Industries du pétrole et du gaz naturel — Systèmes de transport par
conduites — Pratique recommandée pour une longue durée des
conduites
Reference number
©
ISO 2011
©  ISO 2011
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ii © ISO 2011 – All rights reserved

Contents Page
Foreword .iv
Introduction.v
1 Scope.1
2 Normative references.1
3 Terms and definitions .3
4 Abbreviated terms.5
5 Life extension overview.5
5.1 General .5
5.2 Assessment process.6
5.3 Assessment requirements .6
5.4 Limitations on life extension.8
5.5 Pipeline system availability.9
6 Data compilation.9
6.1 General .9
6.2 Data.9
7 Technical integrity of the pipeline system.12
7.1 General .12
7.2 PIMS review.12
7.3 Remediation requirements .13
8 Future threat identification.13
8.1 General .13
8.2 Generic threats .13
8.3 Threats specific to offshore pipeline systems .14
8.4 Threats specific to onshore pipeline systems .14
9 Life extension assessment.14
9.1 Risk assessment .14
9.2 Pipeline system design review .16
9.3 Assessment of remnant life .17
9.4 Integrity management during extended life.20
9.5 Regulatory requirements.20
9.6 Update of systems and procedures .20
10 Life extension report.21
Bibliography.22

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.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.
The main task of technical committees is to prepare International Standards. Draft International Standards
adopted by the technical committees are circulated to the member bodies for voting. Publication as an
International Standard requires approval by at least 75 % of the member bodies casting a vote.
In other circumstances, particularly when there is an urgent market requirement for such documents, a
technical committee may decide to publish other types of normative document:
— an ISO Publicly Available Specification (ISO/PAS) represents an agreement between technical experts in
an ISO working group and is accepted for publication if it is approved by more than 50 % of the members
of the parent committee casting a vote;
— an ISO Technical Specification (ISO/TS) represents an agreement between the members of a technical
committee and is accepted for publication if it is approved by 2/3 of the members of the committee
casting a vote.
An ISO/PAS or ISO/TS is reviewed after three years in order to decide whether it will be confirmed for a
further three years, revised to become an International Standard, or withdrawn. If the ISO/PAS or ISO/TS is
confirmed, it is reviewed again after a further three years, at which time it must either be transformed into an
International Standard or be withdrawn.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. ISO shall not be held responsible for identifying any or all such patent rights.
ISO/TS 12747 was prepared by Technical Committee ISO/TC 67, Materials, equipment and offshore
structures for petroleum, petrochemical and natural gas industries, Subcommittee SC 2, Pipeline
transportation systems.
iv © ISO 2011 – All rights reserved

Introduction
Within ISO/TC 67/SC 2 there has been a series of discussions concerning both the needs and level of
prescription required to address pipeline life extension issues. These have highlighted that
⎯ operators are applying differing approaches, which leads to inefficient use of both operator and authority
resources;
⎯ the assessment and upgrading of existing facilities have been based on probabilistic or reliability-based
methods;
⎯ the level of detail delivered varies.
The purpose of this Technical Specification is to address the above concerns by providing a consistent
approach to pipeline life extension assessment that can be applied by operators (or parties acting on their
behalf) across the industry.
This Technical Specification is concerned with the proof of technical integrity of the pipeline system for the
justification of extended operation. Integrity management is not covered in detail. However, the interface
between a PIMS and the life extension process is considered because
⎯ a PIMS, where present, forms an integral part of the integrity assessment of the pipeline system;
⎯ a PIMS of some form is required for operation in extended life.
Factors affecting the future operability of the system but not the technical integrity, such as the loss of a
control umbilical, are flagged as requiring assessment but are not addressed in full in this Technical
Specification.
Whilst this Technical Specification is aimed primarily at the pipeline operators, it can also be of interest to
other stakeholders such as
⎯ regulators approving the life extension application;
⎯ members of the public affected by the life extension application, such as landowners and developers.
In light of this, an overview of the life extension process and the key principles involved is given in Clause 5.
The remainder of the document is intended to provide detailed guidance to those performing the life extension
assessments.
All guidance is provided for use in conjunction with sound engineering practice and judgment. This Technical
Specification is not intended for use as a design code.

TECHNICAL SPECIFICATION ISO/TS 12747:2011(E)

Petroleum and natural gas industries — Pipeline transportation
systems — Recommended practice for pipeline life extension
1 Scope
This Technical Specification gives guidance to follow, as a minimum, in order to assess the feasibility of
extending the service life of a pipeline system, as defined in ISO 13623, beyond its specified design life. Pump
stations, compressor stations, pressure-reduction stations and depots are not specifically addressed in this
Technical Specification, as shown in Figure 1.
This Technical Specification applies to rigid metallic pipelines. It is not applicable to the following:
⎯ flexible pipelines;
⎯ pipelines constructed from other materials, such as glass reinforced plastics;
⎯ umbilicals;
⎯ topsides equipment;
⎯ structures and structural components.
This Technical Specification is limited to life extension, which is an example of a change to the original design.
Other changes, such as MAOP up-ratings, are excluded.
NOTE The assessment methodology is applicable to other changes to the design at the discretion of the user.
2 Normative references
The following referenced documents are indispensable for the application 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 13623, Petroleum and natural gas industries — Pipeline transportation systems
Key
pipeline systems covered by ISO/TS 12747

connection with other facilities

pipeline not covered by ISO/TS 12747

station/plant area or offshore installation not covered by ISO/TS 12747

station/plant area covered by ISO/TS 12747

Figure 1 — Extent of pipeline systems covered by this Technical Specification
2 © ISO 2011 – All rights reserved

3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
acceptance criteria
specified indicators or measures employed in assessing the ability of a component, structure, or system to
perform its intended function
3.2
anomaly
discrepancy or deviation of an element of the pipeline system from the established rules and limits
3.3
design life
period for which the design basis is planned to remain valid
[ISO 13623]
3.4
failure
event in which a component or system does not perform according to its operational requirements
3.5
flow assurance
ensuring successful and economical flow of fluid through the pipeline system
3.6
high integrity pressure protection system
mechanical overpressure protection system that rapidly isolates the pipeline if there is a risk of exceeding the
maximum allowable operating pressure (MAOP)
3.7
life extension
additional period of time beyond the original design or service life (but within the assessed remnant life) for
which permission to continue operating a pipeline system is granted by the regulatory bodies
NOTE Life extension is considered as a modification to the design basis.
3.8
location class
geographic area classified according to criteria based on population density and human activity
[ISO 13623]
3.9
maximum allowable operating pressure
maximum pressure at which the pipeline system, or parts thereof, is allowed to be operated
[Adapted from ISO 13623]
3.10
operation
activities involved with running and maintaining the pipeline system in accordance with the design premise
3.11
operator
party ultimately responsible for the operation and integrity of the pipeline system
3.12
pipelin
...