EN ISO 13679:2006

SLOVENSKI STANDARD
01-januar-2007
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Petroleum and natural gas industries - Procedures for testing casing and tubing
connections (ISO 13679:2006)
Erdöl- und Erdgasgewinnung - Prüfverfahren an Verbindungen für Futter- und Steigrohre
(ISO 13679:2006)
Industries du pétrole et du gaz naturel - Procédures de test des connexions pour tubes
de cuvelage et de production (ISO 13679:2006)
Ta slovenski standard je istoveten z: EN ISO 13679:2006
ICS:
75.180.10 Oprema za raziskovanje in Exploratory and extraction
odkopavanje equipment
75.200 2SUHPD]DVNODGLãþHQMH Petroleum products and
QDIWHQDIWQLKSURL]YRGRYLQ natural gas handling
]HPHOMVNHJDSOLQD equipment
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD
EN ISO 13679
NORME EUROPÉENNE
EUROPÄISCHE NORM
October 2006
ICS 75.200; 75.180.10
English Version
Petroleum and natural gas industries - Procedures for testing
casing and tubing connections (ISO 13679:2002)
Industries du pétrole et du gaz naturel - Procédures de test Erdöl- und Erdgasgewinnung - Prüfverfahren an
des connexions pour tubes de cuvelage et de production Verbindungen für Futter- und Steigrohre
(ISO 13679:2002)
This European Standard was approved by CEN on 6 October 2006.
CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European
Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national
standards may be obtained on application to the Central Secretariat or to any CEN member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by translation
under the responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as the official
versions.
CEN members are the national standards bodies of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France,
Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania,
Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre: rue de Stassart, 36  B-1050 Brussels
© 2006 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 13679:2006: E
worldwide for CEN national Members.

Foreword
The text of ISO 13679:2002 has been prepared by Technical Committee ISO/TC 67 "Materials,
equipment and offshore structures for petroleum and natural gas industries” of the International
Organization for Standardization (ISO) and has been taken over as EN ISO 13679:2006 by
Technical Committee CEN/TC 12 "Materials, equipment and offshore structures for petroleum,
petrochemical and natural gas industries", the secretariat of which is held by AFNOR.

This European Standard shall be given the status of a national standard, either by publication of
an identical text or by endorsement, at the latest by April 2007, and conflicting national
standards shall be withdrawn at the latest by April 2007.

According to the CEN/CENELEC Internal Regulations, the national standards organizations of
the following countries are bound to implement this European Standard: Austria, Belgium,
Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary,
Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland,
Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.

Endorsement notice
The text of ISO 13679:2002 has been approved by CEN as EN ISO 13679:2006 without any
modifications.
INTERNATIONAL ISO
STANDARD 13679
First edition
2002-12-15
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 13679:2002(E)
©
ISO 2002
ISO 13679:2002(E)
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ii © ISO 2002 — All rights reserved

ISO 13679:2002(E)
Contents Page
Foreword. vi
Introduction . vii
1 Scope. 1
2 Normative references . 1
3 Terms, definitions, symbols and abbreviated terms. 2
3.1 Terms and definitions. 2
3.2 Symbols and abbreviated terms. 4
4 General requirements. 8
4.1 Connection geometry, test load envelope and performance data sheet . 8
4.2 Quality control. 9
5 General test requirements. 9
5.1 Test classes. 9
5.2 Test matrix . 10
5.3 Test programme . 14
5.4 Calibration and accreditation requirements. 15
5.5 Rehearsal tests. 16
5.6 Material property tests. 16
5.7 Make-up and break-out procedures. 17
5.8 Internal pressure leak detection. 18
5.9 Internal pressure leak trap device. 18
5.10 External pressure leak detection. 25
5.11 Data acquisition and test methods . 28
5.12 Thermal cycling tests . 30
6 Connection test specimen preparation .32
6.1 General connection test objectives . 32
6.2 Connection test specimen identification and marking . 33
6.3 Connection test specimen preparation .33
6.4 Connection test specimen machining .35
6.5 Machining tolerances . 36
6.6 Tolerance limits on machining objectives.37
6.7 Grooved torque shoulder. 37
7 Test procedures . 38
7.1 Principle . 38
7.2 Make-up/break-out tests. 38
7.3 Test load envelope tests . 40
7.4 Limit load tests. 52
7.5 Limit load test path (see Figures 18 and 19). 55
8 Acceptance criteria. 57
8.1 Make-up and break-out tests . 57
8.2 Test load envelope tests . 58
8.3 Limit load tests. 58
9 Test reports . 59
Annex A (normative) Connection geometry and performance data sheet. 60
Annex B (informative) Connection test load envelope and limit loads. 67
Annex C (normative) Data forms . 85
ISO 13679:2002(E)
Annex D (normative) Connection full test report .115
Annex E (normative) Connection testing summary report.118
Annex F (informative) Frame load range determination .121
Annex G (informative) Interpolation and extrapolation considerations.122
Annex H (informative) Special application testing .124
Annex I (informative) Rationale for design basis .130
Annex J (normative) Independent seal testing of connections with metal-to-metal and resilient
seals.133
Bibliography.139

Table 1 — Test matrix — Test series and specimen identification numbers.11
Table 2 — Connection test specimen objectives for all CAL.32
Table 3 — Guidelines for selecting connection test specimens for testing a metal-to-metal
sealing, tapered thread connection with a torque shoulder.33
Table 4 — Tolerance limits on machining objectives.36
Table 5 — Specimen description and summary of test series for a metal-to-metal sealing, tapered
thread connection with a torque shoulder .38
Table 6 — Test Series A load steps (see Figures 13 or 14, as applicable) — Testing in quadrants I,
II, III, IV (no bending) at ambient temperature .42
Table 7 — Test Series B load steps without bending for connection rated equal to pipe body
(see Figure 15) — Testing in quadrants I and II without bending at ambient temperature .46
Table 8 — Test Series B load steps with bending for connection rated equal to pipe body
(see Figure 16) — Testing in quadrants I and II with bending at ambient temperature .47
Table A.1 — Connection geometry and performance property data sheet.61
Table A.2 — Example Series A test load envelope for a connection rated equal to pipe body —
178 mm D ×××× 10,16 mm wall thickness ×××× grade P-110 (7 in 29 lb/ft P-110) strength
(see Figure A.1).62
Table A.3 — Detailed load steps .63
Table B.1 — Areas and dimensions .70
Table B.2 — Required dimensions for critical cross-section computation .84
Table F.1 — Typical results from frame load range determination (200 kN to 2 000 kN).121

Figure 1 — Connection application level test programme.12
Figure 2 — Collared leak trap device for internal pressure leak detection.19
Figure 3 — Flexible boot leak trap device for internal pressure leak detection .20
Figure 4 — Ported box leak trap device for internal pressure leak detection.20
Figure 5 — Internal pressure leak detection by bubble method .22
Figure 6 — Example of a plot for determining leak detection sensitivity.23
Figure 7 — Leak detection by helium mass spectrometer method .24
Figure 8 — Example set-up for Test Series A .25
iv © ISO 2002 — All rights reserved

ISO 13679:2002(E)
Figure 9 — Example of leak detection system for Test Series A. 26
Figure 10 — Test Series C thermal/mechanical cycles for CAL II, III, and IV. 30
Figure 11 — Connection test specimen nomenclature and unsupported length . 34
Figure 12 — Torque shoulder pressure bypassing grooves. 37
Figure 13 — Test Series A load path for connection rated greater than or equal to pipe body
in compression. 44
Figure 14 — Test Series A load path for connection rated less than pipe body in compression. 45
Figure 15 — Test Series B load paths without bending for connection rated equal to pipe body. 49
Figure 16 — Test Series B load paths with bending for connection rated equal to pipe body . 50
Figure 17 — Test Series B load paths for connection rated less than pipe body in compression
and with bending. 51
Figure 18 — Limit load test paths for connections rated equal to or stronger than pipe body . 53
Figure 19 — Limit load test paths for connections weaker than pipe body . 54
Figure B.1 — Pipe body and connection test load envelopes at specified dimensions . 68
Figure C.1 — Recommended layout of mother joints for test and material specimens. 86
Figure G.1 — Example premium connection design space . 123
Figure J.1 — Ported box leak trap device for internal pressure leak detection showing
modifications for resilient seal . 135
Figure J.2 — Connection acceptance levels with resilient seal ring. 136
Figure J.3 — Alternative testing sequence for a connection with metal-to-metal (MTM) and
resilient seal (RS) features. 138

ISO 13679:2002(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 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.
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 13679 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.

vi © ISO 2002 — All rights reserved

ISO 13679:2002(E)
Introduction
This International Standard 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
API Recommended Practice 5C5 and proprietary test procedures, with input from leading users,
manufacturers and testing consultants from around the world. This International Standard represents the
knowledge of many years of testing and qualification experiences.
The 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 required. Well design matches the test and limit loads
of both the connection and pipe to the well conditions to provide load capacities with suitable reliability.
The validation of test and limit loads requires testing at the extremes of performance parameters to these
defined loads. Testing at the extremes of the performance parameters assures that the production population,
which falls within these limits, will meet or exceed 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 International Standard. For other connections design analysis is
required to define worst-case tolerance combinations.
Users of this International Standard should be aware that further or differing requirements might be needed for
individual applications. This International Standard is not intended to inhibit a vendor from offering, or a
purchaser from accepting, alternate equipment or engineering solutions for the individual application. This
may be particularly applicable when there is innovative or developing technology. Where an alternative is
offered, the vendor should identify any variations from this International Standard and provide details.
This International Standard consists of the following major parts. Based on manufacturer's-supplied data
specified in Annex A and/or calculations in Annex B, tests are conducted in accordance with Clauses 4 to 8
and reported on the data forms given in Annex C. Annex D lists all the information that is to be provided in the
full report whereas Annex E lists the information that is to be provided in a summary test report. This summary
test report lists the minimum information necessary to fully specify the connection tested and its preparation is
intended for broader distribution. Annex F gives an example of a load frame calibration. Annex G gives
considerations for possible connection product line qualification. Annex H provides guidelines for
supplemental tests, which may be required for special applications. Annex I gives the design rationale for this
International Standard. Annex J gives requirements for connections that contain both a metal-to-metal seal
and a resilient seal which are tested separately.
Supplementary tests may be appropriate for specific applications that are not evaluated by the tests herein.
The user and manufacturer should discuss well applications and limitations of the connection being
considered.
Representatives of users and/or other third party personnel are encouraged to monitor the tests. ISO 13679
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 may influence the service
performance of a connection, is not considered.
This International Standard includes provisions of various nature. These are identified by the use of certain
verbal forms:
 SHALL is used to indicate that a provision is a REQUIREMENT, i.e. MANDATORY;
ISO 13679:2002(E)
 SHOULD is used to indicate that a provision is a RECOMMENDATION to be used as good practice, but
is not mandatory;
 MAY is used to indicate that a provision is OPTIONAL, i.e. indicates a course of action permissible within
the limits of the document;
 CAN is used to indicate statements of POSSIBILITY and CAPABILITY.

viii © ISO 2002 — All rights reserved

INTERNATIONAL STANDARD ISO 13679:2002(E)

Petroleum and natural gas industries — Procedures for testing
casing and tubing connections
1 Scope
This International Standard establishes minimum design verification testing procedures and acceptance
criteria for casing and tubing connections for the oil and natural gas industries. These physical tests are part of
a design verification process and provide objective evidence that the connection conforms to the
manufacturer's claimed test load envelope and limit loads.
It categorizes test severity into four test classes.
It describes a system of identification codes for connections.
This International Standard does not provide the statistical basis for risk analysis.
This International Standard addresses only three of the five distinct types of primary loads to which casing and
tubing strings are subjected in wells: fluid pressure (internal and/or external), axial force (tension or
compression), bending (buckling and/or wellbore deviation), as well as make-up torsion. It does not address
rotation torsion and non-axisymetric (area, line or point contact) loads.
This International Standard specifies tests to be performed to determine the galling tendency, sealing
performance and structural integrity of casing and tubing connections. The words casing and tubing apply to
the service application and not to the diameter of the pipe.
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 3183-1, Petroleum and natural gas industries — Steel pipe for pipelines — Technical delivery
conditions — Part 1: Pipes of requirement class A
ISO 3183-2, Petroleum and natural gas industries — Steel pipe for pipelines — Technical delivery
conditions — Part 2: Pipes of requirements class B
ISO 3183-3, Petroleum and natural gas industries — Steel pipe for pipelines — Technical delivery
conditions — Part 3: Pipes of requirement class C
ISO 10400:1993, Petroleum and natural gas industries — Formulae and calculation for casing, tubing, drill
pipe, and line pipe properties
ISO 10422, Petroleum and natural gas industries — Threading, gauging and thread inspection of casing,
tubing and line pipe threads
ISO 11960, Petroleum and natural gas industries — Steel pipes for use as casing or tubing for wells
ISO 13680, Petroleum and natural gas industries — Corrosion-resistant alloy seamless tubes for use as
casing, tubing and coupling stock — Technical delivery conditions
ISO 13679:2002(E)
API Bul 5C3, Bulletin on formulas and calculations for casing, tubing, drill pipe and line pipe properties
API Spec 5B, Specification for threading, gauging, and thread inspection of casing, tubing, and line threads
(U.S. Customary Units)
API Spec 5L, Specification for line pipe
3 Terms, definitions, symbols and abbreviated terms
For the purposes of this document, the following terms, definitions, symbols and abbreviated terms apply.
3.1 Terms and definitions
3.1.1
ambient temperature
actual room temperature in the test lab with no residual heat remaining in test specimens from previous
thermal tests
3.1.2
axial-pressure load diagram
plot of pressure versus axial load showing pipe and/or connection test load envelope or limit load extremes
3.1.3
connection
assembly consisting of either two pins and a coupling or one pin and an integral box
3.1.4
failure load
load at which the pipe body or connection will fail catastrophically as in an axial separation, a rupture, large
permanent deformation (e.g. buckling or collapse) or massive loss of sealing integrity
3.1.5
galling
cold welding of contacting material surfaces followed by tearing of the metal during further sliding/rotation
NOTE 1 Galling results from the sliding of metallic surfaces that are under high bearing forces. Galling can generally be
attributed to insufficient lubrication between the mating surfaces. The purpose of the lubricating medium is to minimize
metal-to-metal contact and allow efficient sliding of the surfaces. Other ways to prevent galling are to reduce the bearing
forces or reduce the sliding distance.
NOTE 2 There are several degrees of galling used for repair and reporting purposes as defined in 3.1.5.1 to 3.1.5.3.
3.1.5.1
light galling
galling that can be repaired by the use of abrasive paper
3.1.5.2
moderate galling
galling that can be repaired by the use of fine files and abrasive paper
3.1.5.3
severe galling
galling that cannot be repaired by the use of fine files and abrasive paper
3.1.6
leak
any positive displacement of fluid in the measuring system during hold periods
2 © ISO 2002 — All rights reserved

ISO 13679:2002(E)
3.1.7
limit load
load combination extreme (axial load and/or pressure) which defines the failure conditions for the connection
or maximum load resulting in large permanent deformation (such as buckling) prior to catastrophic failure
3.1.8
lot
lengths of pipe with the same specified dimensions and grade from the same heat of steel which are heat-
treated as part of a continuous operation (or batch)
3.1.9
metal-to-metal seal
seal or sealing system that relies on intimate and usually high contact stress of mating metal surfaces to
achieve a seal
NOTE The thread compound can affect, both beneficially and detrimentally, the performance of a metal seal.
3.1.10
mother joint
length of pipe or coupling stock from which short lengths are cut for machining connection test specimens
3.1.11
multiple seals
sealing system, which consists of more than one independent barrier, and of which each barrier forms a seal
itself
3.1.12
pipe string
pipe body and the connection
3.1.13
pup joint
short pipe length usually with threaded ends
3.1.14
resilient seal
seal or sealing system, which relies on entrapment of a seal ring within a section of the connection (e.g. in the
thread-form, on a seal area, etc.) to achieve a seal
3.1.15
seal
barrier to prevent the passage of fluids
3.1.16
seal ovality
maximum seal diameter minus the minimum seal diameter divided by the average seal diameter multiplied
by 100
NOTE Seal ovality is expressed as a percentage.
3.1.17
single seal
one barrier or multiple barriers that cannot be physically differentiated in their function
3.1.18
specimen
connection between two pieces of pipe
NOTE The specimen can be composed of one coupling and two pins for coupled connections, or one pin and one
box for integral connections.
ISO 13679:2002(E)
3.1.19
test load envelope
extremes of loads (axial load, pressure, bending) and temperature within which the connection will perform
cyclically
NOTE The manufacturer has the primary responsibility for defining the test load envelope for their connection
products (see 4.1).
3.1.20
thread lot
all products manufactured on a given machine during a continuous production cycle that is not interrupted by
a catastrophic tool failure or injurious machine malfunction (excluding worn tools or minor tool breakage), tool
holder change (except rough boring bar) or any other malfunction of either threading equipment or inspection
gauges
3.1.21
thread seal
seal or sealing system, which relies on intimate fitting of the thread-form and usually entrapment of the thread
compound within the thread-form to achieve a seal
3.2 Symbols and abbreviated terms
3.2.1 Symbols
A Area calculated based on the pipe inside diameter
i
A Area calculated based on the pipe outside diameter
o
A Cross-section area of pipe body
p
C Compressive axial force
D Specified pipe outside diameter
D Inside diameter
i
D Outside diameter
o
D Effective dogleg severity expressed in degrees per thirty metres
leg
E Error in load frame calibration
r
E Error in load frame calibration expressed in percent
rp
F Failure
F Axial force, tension or compression
a
F Bending equivalent axial force
b
F Published joint strength of the connection when the joint strength is the compressive rated load of the
c
connection
F Actual load frame axial force, tension or compression
f
F Indicated load frame axial force, tension or compression
i
4 © ISO 2002 — All rights reserved

ISO 13679:2002(E)
F Published joint strength of the connection when the joint strength is the tensile parting or failure load of
t
the connection
F Published joint strength of the connection when the joint strength is the tensile yield load of the
y
connection
I Moment of inertia
K Compression efficiency factor of the connection
c
K Internal pressure efficiency factor of the connection
pi
K External pressure efficiency factor of the connection
pe
K Tension efficiency factor of the connection
t
k , k Geometric variable
i o
L Length of pin A end from coupling face (or connection) to end cap or grip length
A
L Length of pin B end from coupling face (or connection) to end cap or grip length
B
L Length of coupling or connection if integral
c
L Minimum unsupported pup joint length
pj
M Bending moment
M Super bending moment
o
p ISO 10400 collapse rating for specified wall thickness and actual specimen yield strength
c
p Internal pressure
i
p Internal pressure with bending
ib
p High internal pressure
ih
p Normalized internal test pressure
in
p Low internal pressure
il
p ISO 10400:1993, Section 3, internal yield pressure for the pipe body
iyp
p External pressure
o
p External pressure with bending
ob
p Normalized external test pressure
on
p Thermal cycle pressure at elevated temperature
tc
p Maximum pressure for an internal fibre stress S
y yt
ISO 13679:2002(E)
q Actual leak rate to be reported
ac
q Observed leak rate
o
R Radius of curvature of the pipe body at the axis of the pipe
S 100 % of minimum of the specimen mother joint tensile strength (measured at room temperature or at
t
elevated temperature as given in Table 1) for a pipe member or coupling in a T&C specimen (pin or box
member for an integral connection)
S 100 % of minimum of the specimen mother joint yield strength (measured at room temperature or at
y
elevated temperature as given in Table 1) for a pipe member or coupling in a T&C specimen (pin or box
member for an integral connection)
S 95 % S for Series A and B tests, and 80 %, 90 % and 95 % for Series C tests (see 5.12.4)
yt y
t Specified pipe wall thickness
t Actual minimum wall thickness
ac
T Tension axial force
η Leak detection system efficiency
lds
σ Stress
σ Axial stress without bending
a
σ Axial stress with bending
ab
σ Axial stress with super critical bending
ao
σ Axial stress due to bending
b
σ Axial stress due to super critical bending
bo
σ Axial compressive yield strength if available or otherwise axial tensile yield strength
c
σ Hoop (tangential) stress
h
σ Hoop (tangential) stress at outside diameter
ho
σ Radial (normal) stress
r
σ Radial (normal) stress at outside diameter
ro
σ Transverse tensile yield strength if available or otherwise axial tensile yield strength
t
σ Defined transverse compressive yield strength if available or otherwise axial tensile yield strength
tc
σ Von Mises equivalent stress
v
σ Axial tensile yield strength, normally the ISO/API axial tensile yield strength
y
6 © ISO 2002 — All rights reserved

ISO 13679:2002(E)
3.2.2 Abbreviations
CAL Connection application level for which the successfully tested pipe [size, mass (label: weight), grade]
and connections are intended to be used
CCS Critical cross-section
CCW Counter-clockwise direction
CW Clockwise direction
CEPL Capped end pressure load (tension)
CEYP Capped end yield pressure
CRA Corrosion-resistant alloy
EUE External upset end
FMU Final make-up specimen condition
kips 1 000 lbf (pound-force)
ksi 1 000 lbf (pound-force) per square inch
lb Pound mass
LL Limit load
LP Load point
LP1 Limit load test path 1
LP2 Limit load test path 2
LP3 Limit load test path 3
LP4 Limit load test path 4
LP5 Limit load test path 5
LP6 Limit load test path 6
LP7 Limit load test path 7
LP8 Limit load test path 8
M/B Make-up/break-out
MBG Make/break galling test specimen condition
MC Mechanical cycle
MT Material test coupon
MTC Metal seal threaded and coupled connection
MTM Metal-to-metal seal
ISO 13679:2002(E)
MU Make-up
OCTG Oil country tubular goods
PTFE Polytetrafluoroethylene
r/min Revolutions per minute
RRG Round-robin galling test specimen condition
RS Resilient seal
SRG Seal ring groove
Std Standard
TC Thermal cycle
TLE Test load envelope
TSC Thread sealing connection
T&C Threaded and coupled
VME Von Mises equivalent stress
4 General requirements
4.1 Connection geometry, test load envelope and performance data sheet
The manufacturer shall provide connection geometry and a performance data sheet for the product stating its
connection application level and its geometry and performance properties in terms of tension, compression,
internal pressure, external pressure, bending, and torque compared to the pipe body. See Table A.1 for the
connection geometry and performance data sheet. The manufacturer shall provide a drawing, which is
representative of the cross-sectional area of the connection. The manufacturer shall also provide a test load
envelope in graphical form (VME plot) and should quantify limit loads. The manufacturer's own method of
calculation should be used to derive the connection test load envelope and to calculate the test loads.
Performance data or the method described in Annex B may be used.
Annex B has been provided as a means by which a manufacturer or user may estimate the test load envelope
using a connection performance model based on capacities of specific critical cross-sections in the
connection.
The manufacturer should define as completely as possible the limit loads for each connection. A user may
also make an independent estimate of the limit loads. Limit loads shall be greater than the test load envelope.
It is critical that the combined load capacity described by the test load envelope be defined near and
throughout the conditions where the dominant load sensitivity of the connection may change from pressure to
axial force and/or bending or vice versa. Connection equations, whether analytically or experimentally based,
shall define the test load envelope for all combinations of pressure and axial force and for bending (as
applicable). These equations shall also be suitable to calculate the test loads based on actual yield strength
and geometry of the specimen and include any other structural or sealing performance requirements. The
form of the equation shall facilitate the calculation of the pressure value given the axial load, with or without
bending.
Since casing and tubing connection designs and the resultant performance can vary widely, no overall
requirement for the minimum number of values in a tabular data format can be mandated. However, it is
8 © ISO 2002 — All rights reserved

ISO 13679:2002(E)
expected that approximately 10 combined load values of pressure and axial force per quadrant should be
sufficient to define the test and limit loads. If a connection design exhibits changes in load sensitivities, the
loads at which the changes in load sensitivity occur shall be provided.
In the calculation of both pipe body and connection load capacities, it is the intent of this International
Standard to test the specimens to as high a load or combination of loads as safely practical.
In the event that unanticipated events result in deviations to the detailed requirements and or procedures,
such deviations shall be clearly identified in the documentation.
4.2 Quality control
All quality control procedures for the manufacturing of test specimens shall be documented and shall be
consistent with procedures used for connections manufactured for well service. The connection manufacturer
shall ensure that the connections manufactured for the purpose of these design verification tests are of the
same design and manufactured to the same dimensions and extremes of tolerances (see Clause 6) as those
supplied for well service. The connection manufacturer shall issue a declaration of conformity (see for
example, ISO/IEC Guide 22).The manufacturer shall provide the process control plan. This process control
plan shall include procedure number or drawing number as well as associated revision levels for all applicable
sub-tier documents (manufacturing, gauge calibration, gauging procedure, surface treatment, etc.). These
procedures and any others determined necessary to provide a consistent product for well service shall be
used during manufacturing of all test specimens (see A.4).
5 General test requirements
5.1 Test classes
5.1.1 Principle
Connection performance data are generated by testing. Passing the tests demonstrates conformance of the
connection to the specified connection application level. Failure of some or all tests may result in a revision of
the connection design or a revision of the test or limit loads. In the first case, the testing shall be repeated. In
the second case, the tests that failed shall be repeated unless they conform to the revised load envelope.
Four test classes, known as connection application lev
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