Petroleum and natural gas industries — Procedures for testing casing and tubing connections

This document specifies tests to perform in order to determine the galling tendency, sealing performance and structural integrity of casing and tubing connections. "Casing" and "tubing" apply to the service application and not to the diameter of the pipe. This document covers the testing of connections for the most commonly encountered well conditions. Not all possible service scenarios are included. For example, the presence of a corrosive fluid, which can influence the service performance of a connection, is not considered. This document supplements API RP 5C5:2017, the requirements of which are applicable with the exceptions specified in this document.

Industries du pétrole et du gaz naturel — Procédures de test des connexions pour tubes de cuvelage et de production

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Second edition
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 13679:2019(E)
ISO 2019

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ISO 13679:2019(E)

© ISO 2019
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
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Fax: +41 22 749 09 47
Published in Switzerland
ii © ISO 2019 – All rights reserved

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ISO 13679:2019(E)

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
© ISO 2019 – All rights reserved iii

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ISO 13679:2019(E)

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 documents 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).
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. Details of
any patent rights identified during the development of the document will be in the Introduction and/or
on the ISO list of patent declarations received (see www .iso .org/patents).
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, 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
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

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ISO 13679:2019(E)

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

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