ISO 13679:2019

INTERNATIONAL ISO
STANDARD 13679
Second edition
2019-07
Petroleum and natural gas
industries — Procedures for testing
casing and tubing connections
Industries du pétrole et du gaz naturel — Procédures de test des
connexions pour tubes de cuvelage et de production
Reference number
©
ISO 2019
© ISO 2019
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ii © ISO 2019 – All rights reserved

Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Supplements to API RP 5C5:2017 . 1
4.1 General requirements . 1
4.2 Scope . 2
4.3 Normative references . 2
4.4 Nominal connection performance envelope . 2
4.5 Anisotropic reference curves . 2
4.6 Near-yield loading effects . 2
4.7 Test report . 3
Bibliography . 4
Foreword
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electrotechnical standardization.
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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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.org/iso/foreword .html.
This document was prepared by Technical Committee ISO/TC 67, Materials, equipment and offshore
structures for petroleum, petrochemical and natural gas industries, Subcommittee SC 5, Casing, tubing
and drill pipe.
This second edition cancels and replaces the first edition (ISO 13679:2002), which has been technically
revised.
This document supplements API RP 5C5:2017.
The technical requirements of this document and API Recommended Practice (RP) 5C5 used to be
identical. In the meantime API RP 5C5 has been technically revised as API RP 5C5:2017. The purpose of
this edition of ISO 13679 is to bring it up to date, by referencing the current edition of API RP 5C5 and
including supplementary content.
The main changes compared to the previous edition of ISO 13679 are as follows:
— new specimen geometries, e.g. XH-XL have been added;
— all Connection Assessment Level(s) test requirements and sequences have been revised.
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.
iv © ISO 2019 – All rights reserved

Introduction
This document is part of a process to provide reliable tubing and casing connections for the oil and
natural gas industry which are fit for purpose. It has been developed based on improvements to
ISO 13679:2002 and proprietary test procedures, with input from leading users, manufacturers and
testing consultants from around the world. This document represents the knowledge of many years of
testing and qualification experiences, where many oil and gas industry manufacturers and operators
have utilized the testing protocol to improve connection performance with objective evidence, i.e.
physical testing.
The experimental validation of connection test load envelope and failure limit loads is relevant to
design of tubing and casing for the oil and natural gas industries. Tubing and casing are subject to loads
which include internal pressure, external pressure, axial tension, axial compression, bending torsion,
transverse forces and temperature changes. The magnitude and combination of these loads result
in various pipe body and connection failure modes. Although pipe body test and limit loads are well
understood in general, the same cannot be stated for the connection. These failure modes and loads are
generally different and often less than that of the pipe. Consequently, experimental validation is needed.
The validation of test and limit loads implies the testing of performance parameters to these defined
loads at the extremes. Testing at the extremes of the performance parameters assures that the
production population that falls within these limits meets or exceeds the performance of the test
population. Thread connection performance parameters include dimensional tolerances, mechanical
properties, surface treatment, make-up torque and the type and amount of thread compound. For
typical proprietary connections, worst-case tolerances are known and defined in this document. For
other connections designs, the worst-case tolerance combinations need to be determine
...