ISO 11960:2004

INTERNATIONAL ISO
STANDARD 11960
Third edition
2004-12-15

Petroleum and natural gas industries —
Steel pipes for use as casing or tubing
for wells
Industries du pétrole et du gaz naturel — Tubes d'acier utilisés comme
cuvelage ou tubes de production dans les puits




Reference number
ISO 11960:2004(E)
©
ISO 2004

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ISO 11960:2004(E)
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©  ISO 2004
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ISO 11960:2004(E)
Contents Page
Foreword. vi
Introduction . vii
1 Scope. 1
2 Conformance . 2
2.1 Normative references . 2
2.2 Units of measurement . 2
3 Normative references . 2
4 Terms, definitions, symbols and abbreviated terms. 4
4.1 Terms and definitions. 4
4.2 Symbols and abbreviated terms. 8
5 Information to be supplied by the purchaser.9
5.1 Casing . 9
5.2 Tubing . 11
5.3 Coupling stock and accessories . 12
6 Process of manufacture . 12
6.1 General. 12
6.2 Heat treatment . 13
6.3 Straightening . 13
6.4 Traceability . 14
6.5 Processes requiring validation. 15
7 Material requirements. 15
7.1 Chemical composition. 15
7.2 Tensile properties . 15
7.3 Charpy V-notch test — General requirements. 16
7.4 Charpy V-notch test — Absorbed energy requirements for coupling stock, coupling
blanks and couplings . 17
7.5 Charpy V-notch test — Absorbed energy requirements for pipe . 18
7.6 Charpy V-notch test — Absorbed energy requirements for casing and tubing accessories . 20
7.7 Maximum hardness. 21
7.8 Hardness variation — Grades C90, T95 and Q125 . 21
7.9 Process control — Grades C90, T95 and Q125. 21
7.10 Hardenability — Minimum percentage martensite for quenched and tempered products . 21
7.11 Grain size — Grades C90 and T95. 22
7.12 Surface condition — Grades L80 9Cr and L80 13Cr. 22
7.13 Flattening — Electric-welded pipe . 22
7.14 Sulfide stress cracking test — Grades C90 and T95. 22
8 Dimensions, masses, tolerances, pipe ends and defects . 24
8.1 Labels and sizes. 24
8.2 Dimensions and masses . 24
8.3 Diameter. 24
8.4 Wall thickness . 25
8.5 Mass . 25
8.6 Length . 25
8.7 Casing jointers . 25
8.8 Height and trim of electric-weld flash. 26
8.9 Straightness . 26
8.10 Drift requirements . 27
8.11 Tolerances on dimensions and masses. 27
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ISO 11960:2004(E)
8.12 Pipe ends.28
8.13 Defects.30
8.14 Coupling make-up and thread protection.30
9 Couplings .31
9.1 General requirements .31
9.2 Alternative grades or heat treatments.31
9.3 Process of manufacture — Groups 1, 2 and 3 .32
9.4 Process of manufacture — Grade Q125 .32
9.5 Mechanical properties .32
9.6 Dimensions and tolerances.32
9.7 Regular couplings .32
9.8 Special-clearance couplings — Groups 1, 2 and 3.33
9.9 Combination couplings .33
9.10 Reducing couplings — Groups 1, 2 and 3 .33
9.11 Seal-ring couplings .33
9.12 Special-bevel tubing couplings — Groups 1, 2 and 3 .33
9.13 Threading .33
9.14 Surface inspection .34
9.15 Measurement of imperfections .35
9.16 Repair and removal of imperfections and defects.35
9.17 Thread surface treatment — Grade Q125 .35
9.18 Couplings and coupling blank protection — Grades C90, T95 and Q125.35
10 Inspection and testing .35
10.1 Test equipment.35
10.2 Lot definition for testing of mechanical properties .35
10.3 Testing of chemical composition .36
10.4 Tensile tests.37
10.5 Flattening test.39
10.6 Hardness test.40
10.7 Impact test.44
10.8 Grain size determination — Grades C90 and T95.46
10.9 Hardenability — Grades C90 and T95 .46
10.10 Sulfide stress-cracking test — Grades C90 and T95.46
10.11 Metallographic evaluation — EW Grades P110 and Q125 .46
10.12 Hydrostatic tests .46
10.13 Dimensional testing .48
10.14 Visual inspection.51
10.15 Non-destructive examination (NDE).51
11 Marking.58
11.1 General .58
11.2 Stamp marking requirements.59
11.3 Stencil marking requirements.60
11.4 Colour identification.60
11.5 Thread and end-finish marking — All groups .61
11.6 Pipe-threader marking requirements — All groups.61
12 Coating and protection .62
12.1 Coatings — All groups.62
12.2 Thread protectors.62
13 Documents .63
13.1 Electronic media — All groups .63
13.2 Certification — Groups 1, 2 and 3.63
13.3 Certification requirements — Grade Q125.63
13.4 Retention of records .63
14 Minimum facility requirements for various categories of manufacturer.64
14.1 Pipe mill.64
14.2 Processor .64
14.3 Pipe threader.64
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ISO 11960:2004(E)
14.4 Coupling, pup-joint or accessory manufacturer. 64
Annex A (normative) Supplementary requirements . 66
Annex B (normative) Purchaser inspection. 80
Annex C (normative) Tables in SI units. 81
Annex D (normative) Figures in SI (USC) units. 154
Annex E (normative) Tables in USC units. 184
Annex F (informative) Marking instructions for API licensees . 258
Annex G (informative) Procedures used to convert from USC units to SI units. 263
Annex H (normative) Product Specification Levels. 276
Annex I (normative) Requirements for thread protector design validation . 283
Annex J (informative) Summary of Product Specification Level (PSL) requirements . 287
Bibliography . 291

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ISO 11960:2004(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 11960 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 third edition cancels and replaces the second edition (ISO 11960:2001), which has been technically
revised. It also incorporates the Technical Corrigendum ISO 11960:2001/Cor.1:2002.
It is the intent of TC 67 that the second and third editions of ISO 11960 both be applicable, at the option of the
purchaser (as defined in 4.1.35), for a period of six months from the first day of the calendar quarter
immediately following the date of publication of this third edition, after which period the second edition will no
longer be applicable.

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ISO 11960:2004(E)
Introduction
This International Standard is based on API 5CT (Specification for Casing and Tubing).
Users of this International Standard should be aware that further or differing requirements may be needed for
individual applications. This International Standard is not intended to inhibit a vendor from offering, or the
purchaser from accepting, alternative equipment or engineering solutions for the individual application. This
may be particularly applicable where 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 includes requirements of various nature. These are identified by the use of certain
verbal forms:
 SHALL is used to indicate that a provision is MANDATORY;
 SHOULD is used to indicate that a provision is not mandatory, but RECOMMENDED as good practice;
 MAY is used to indicate that a provision is OPTIONAL.

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INTERNATIONAL STANDARD ISO 11960:2004(E)

Petroleum and natural gas industries — Steel pipes for use as
casing or tubing for wells
1 Scope
1.1 This International Standard specifies the technical delivery conditions for steel pipes (casing, tubing,
plain-end casing liners and pup joints), coupling stock and accessories and establishes requirements for three
Product Specification Levels (PSL-1, PSL-2, PSL-3). The requirements for PSL-1 are the basis of this
International Standard. The requirements that define different levels of standard technical requirements for
PSL-2 and PSL-3, for all Grades except H-40 and L-80 9Cr, are contained in Annex H.
For pipes covered by this International Standard, the sizes, masses and wall thicknesses as well as grades
and applicable end-finishes are listed in Tables C.1 to C.3 and Tables E.1 to E.3.
By agreement between the purchaser and manufacturer, this International Standard can also be applied to
other plain-end pipe sizes and wall thicknesses.
This International Standard is applicable to the following connections in accordance with API Spec 5B:
 short round thread casing (STC);
 long round thread casing (LC);
 buttress thread casing (BC);
 extreme-line casing (XC);
 non-upset tubing (NU);
 external upset tubing (EU);
 integral joint tubing (IJ).
For such connections, this International Standard specifies the technical delivery conditions for couplings and
thread protection. Supplementary requirements that may optionally be agreed for enhanced leak resistance
connections are given in Annex A.11 (SR22).
This International Standard can also be applied to tubulars with connections not covered by ISO/API
standards.
1.2 The four groups of products to which this International Standard is applicable include the following
grades of pipe:
 Group 1: All casing and tubing in Grades H, J, K and N;
 Group 2: All casing and tubing in Grades C, L, M and T;
 Group 3: All casing and tubing in Grade P;
 Group 4: All casing in Grade Q.
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ISO 11960:2004(E)
1.3 Casing sizes larger than Label 1: 4-1/2 but smaller than Label 1: 10-3/4 may be specified by the
purchaser to be used in tubing service, see Tables C.1, C.24, C.30 and C.31 or Tables E.1, E.24, E.30 and
E.31.
1.4 Supplementary requirements that may optionally be agreed between purchaser and manufacturer for
non-destructive examination, coupling blanks, upset casing, electric-welded casing, impact testing, seal ring
couplings and certificates are given in Annex A.
1.5 This International Standard is not applicable to threading requirements.
NOTE Dimensional requirements on threads and thread gauges, stipulations on gauging practice, gauge
specifications, as well as instruments and methods for inspection of threads are given in API Spec 5B.
2 Conformance
2.1 Normative references
In the interests of world-wide application of this International Standard, ISO/TC 67 has decided, after detailed
technical analysis, that certain of the normative documents listed in Clause 3 and prepared by ISO/TC 67 or
other ISO Technical Committee are interchangeable in the context of the relevant requirement with the
relevant document prepared by the American Petroleum Institute (API), the American Society for Testing and
Materials (ASTM) or the American National Standards Institute (ANSI). These latter documents are cited in
the running text following the ISO reference and preceded by “or”, for example “ISO XXXX or API YYYY”.
Application of an alternative normative document cited in this manner will lead to technical results different
from the use of the preceding ISO reference. However, both results are acceptable and these documents are
thus considered interchangeable in practice.
2.2 Units of measurement
In this International Standard, data are expressed in both the International System (SI) of units and the United
States Customary (USC) system of units. For a specific order item, it is intended that only one system of units
be used, without combining data expressed in the other system.
Products manufactured to specifications expressed in either of these unit systems shall be considered
equivalent and totally interchangeable. Consequently, compliance with the requirements of this International
Standard as expressed in one system provides compliance with requirements expressed in the other system.
For data expressed in the SI, a comma is used as the decimal separator and a space as the thousands
separator. For data expressed in the USC system, a dot (on the line) is used as the decimal separator and a
space as the thousands separator.
In the text, data in SI units are followed by data in USC units in parentheses.
Separate tables for data expressed in SI units and USC units are given in Annex C and Annex E respectively.
Figures are contained in Annex D and express data in both SI and USC units.
3 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 31-0, Quantities and units — Part 0: General principles
ISO 643, Steels — Micrographic determination of the apparent grain size
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ISO 11960:2004(E)
ISO 6506-1, Metallic materials — Brinell hardness test — Part 1:Test method
ISO 6508-1, Metallic materials — Rockwell hardness test — Part 1:Test method (Scales A, B, C, D, E, F, G, H,
K, N, T)
ISO 6892, Metallic materials — Tensile testing at ambient temperature
ISO 7500-1, Metallic materials — Verification of static uniaxial testing machines — Part 1:
Tension/compression testing machines — Verification and calibration of the force-measuring system
ISO 8501-1, Preparation of steel substrates before application of paints and related products — Visual
assessment of surface cleanliness — Part 1: Rust grades and preparation grades of uncoated steel
substrates and of steel substrates after overall removal of previous coatings
ISO 9303, Seamless and welded (except submerged arc-welded) steel tubes for pressure purposes — Full
peripheral ultrasonic testing for the detection of longitudinal imperfections
ISO 9304, Seamless and welded (except submerged arc-welded) steel tubes for pressure purposes — Eddy
current testing for the detection of imperfections
ISO 9305, Seamless steel tubes for pressure purposes — Full peripheral ultrasonic testing for the detection of
transverse imperfections
ISO 9402, Seamless and welded (except submerged arc-welded) steel tubes for pressure purposes — Full
peripheral magnetic transducer/flux leakage testing of ferromagnetic steel tubes for the detection of
longitudinal imperfections
ISO 9598, Seamless steel tubes for pressure purposes — Full peripheral magnetic transducer/flux leakage
testing of ferromagnetic steel tubes for the detection of transverse imperfections
ISO 9764, Electric resistance and induction welded steel tubes for pressure purposes — Ultrasonic testing of
the weld seam for the detection of longitudinal imperfections
ISO/TR 9769, Steel and iron — Review of available methods of analysis
ISO 10400, Petroleum and natural gas industries — Formulae and calculation for casing, tubing, drill pipe and
line pipe properties
ISO 11
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