ISO 11960:2001

INTERNATIONAL ISO
STANDARD 11960
Second edition
2001-10-01
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 11960:2001(E)
©
ISO 2001

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ISO 11960:2001(E)
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ISO 11960:2001(E)
Contents Page
Foreword.vi
Introduction.vii
1 Scope .1
2 Conformance.2
2.1 Normative references .2
2.2 Units of measurement .2
2.3 Tables and figures .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.10
6 Process of manufacture.12
6.1 General.12
6.2 Heat treatment.12
6.3 Straightening.13
6.4 Traceability.13
7 Material requirements .14
7.1 Chemical composition .14
7.2 Tensile properties.14
7.3 Charpy V-notch test properties — General requirements.15
7.4 Charpy V-notch (CVN) — Absorbed energy requirements for coupling stock, coupling blanks
and couplings.16
7.5 Charpy V-notch — Absorbed energy requirements for pipe .17
7.6 Charpy V-notch test — Absorbed energy requirements for casing and tubing accessories.19
7.7 Hardness maxima .20
7.8 Hardness variation — Grades C90, T95 and Q125 .20
7.9 Process control — Grades C90, T95 and Q125 .20
7.10 Hardenability — Minimum percentage martensite for quenched and tempered products.21
7.11 Grain size — Grades C90 and T95 .21
7.12 Surface condition — Grades L80 9Cr and L80 13Cr .21
7.13 Flattening — Electric-welded pipe .21
7.14 Sulfide stress corrosion cracking (SSCC) test — Grades C90 and T95 .21
8 Dimensions, masses, tolerances, pipe ends and defects .23
8.1 Labels and sizes .23
8.2 Dimensions and masses.23
8.3 Diameter.23
8.4 Wall thickness.24
8.5 Mass.24
8.6 Length.24
8.7 Casing jointers.24
8.8 Height and trim of electric-weld flash.24
8.9 Straightness .25
8.10 Drift requirements.25
8.11 Tolerances on dimensions and masses.26
8.12 Pipe ends.27
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ISO 11960:2001(E)
8.13 Defects .28
8.14 Coupling make-up and thread protection .29
9 Couplings.29
9.1 General requirements.29
9.2 Alternative grades or heat treatments .29
9.3 Process of manufacture — Groups 1, 2 and 3.30
9.4 Process of manufacture — Grade Q125.30
9.5 Mechanical properties.30
9.6 Dimensions and tolerances .31
9.7 Regular couplings.31
9.8 Special-clearance couplings — Groups 1, 2 and 3 .31
9.9 Combination couplings.31
9.10 Reducing couplings.31
9.11 Seal-ring couplings.31
9.12 Special-bevel couplings — Groups 1, 2 and 3.32
9.13 Threading.32
9.14 Surface inspection.32
9.15 Measurement of imperfections.33
9.16 Repair and removal of imperfections and defects .33
9.17 Thread surface treatment — Grade Q125.33
9.18 Couplings and coupling blank protection — Grade Q125.33
10 Inspection and testing.33
10.1 Test equipment .33
10.2 Lot definition for testing of mechanical properties.34
10.3 Testing of chemical composition.34
10.4 Tensile tests .35
10.5 Flattening test .37
10.6 Hardness test .38
10.7 Impact test .41
10.8 Grain size determination — Grades C90 and T95 .43
10.9 Hardenability — Grades C90 and T95.43
10.10 Sulfide stress cracking test — Grades C90 and T95.43
10.11 Metallographic evaluation — EW Grades P110 and Q125.43
10.12 Hydrostatic test.43
10.13 Dimensional testing.45
10.14 Visual inspection .47
10.15 Non-destructive examination (NDE) .48
11 Marking .53
11.1 General.53
11.2 Stamp marking requirements .54
11.3 Stencil marking requirements .55
11.4 Colour identification .55
11.5 Thread and end-finish marking — All groups.56
11.6 Pipe-threader marking requirements — All groups .56
12 Coating and protection.57
12.1 Coatings — All groups .57
12.2 Thread protectors .57
13 Documents.58
13.1 Electronic media — All groups.58
13.2 Certification — Groups 1, 2 and 3 .58
13.3 Certification requirements — Grade Q125 .58
13.4 Retention of records.58
14 Minimum facility requirements for various categories of manufacturer .58
14.1 Pipe mill .58
14.2 Processor.59
14.3 Threader.59
14.4 Coupling, pup-joint, and accessory manufacturer.59
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ISO 11960:2001(E)
Annex A (normative) Supplementary requirements.60
Annex B (normative) Purchaser inspection .72
Annex C (normative) Tables in SI units .73
Annex D (normative) Figures in SI (USC) units.136
Annex E (normative) Tables in USC units .158
Annex F (informative) Marking instructions for API licensees.217
Annex G (informative) Procedures used to convert from USC units to SI units .221
Bibliography.234
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ISO 11960:2001(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 3.
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 International Standard may be the subject of
patent rights. ISO shall not be held responsible for identifying any or all such patent rights.
International Standard ISO 11960 was prepared by Technical Committee ISO/TC 67, Materials, equipment and
offshore structures for petroleum and natural gas industries, Subcommittee SC 5, Casing, tubing and drill pipe.
This second edition replaces the first edition (ISO 11960:1996) which has been technically revised. It is the intent of
TC 67 that the first and second editions of ISO 11960 both be applicable, at the user's option, for a period of six
months after the date of publication of this second edition, after which the first edition will no longer be applicable.
Annexes A to E form a normative part of this International Standard. Annexes F and G are for information only.
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ISO 11960:2001(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;
� MAYis usedto indicatethat aprovision is OPTIONAL.
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INTERNATIONAL STANDARD ISO 11960:2001(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) and accessories. This International Standard is applicable to the following
connections in accordance with ISO 10422 or 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.
For pipes covered by this International Standard, the sizes, masses, wall thicknesses, grades and applicable end
finishes are defined.
This International Standard may 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.
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 ISO 10422 or API Spec 5B. Connections machined to
either of these specifications are the same for practical purposes and are totally interchangeable.
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ISO 11960:2001(E)
2 Conformance
2.1 Normative references
In the interests of worldwide 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 the same results as the use of the preceding
ISO reference. 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 brackets.
2.3 Tables and figures
Separate tables for data expressed in SI units and USC units are given in annex C and annex E respectively. For a
specific order item, only one unit system shall be used.
Figures are contained in annex D and express data in both SI and USC units.
3 Normative references
The following normative documents contain provisions which, through reference in this text, constitute provisions of
this International Standard. For dated references, subsequent amendments to, or revisions of, any of these
publications do not apply. However, parties to agreements based on this International Standard are encouraged to
investigate the possibility of applying the most recent editions of the normative documents indicated below. For
undated references, the latest edition of the normative document referred to applies. Members of ISO and IEC
maintain registers of currently valid International Standards.
ISO 31-0, Quantities and units — Part 0: General principles
ISO 643, Steels — Micrographic determination of the ferritic or austenitic grain size
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
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ISO 11960:2001(E)
ISO 7500-1, Metallic materials — Verification of static uniaxial testing machines — Part 1: Tensile/compression
testing machines — Verification and calibration of the force-measuring system
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 10400, 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 — Specification
ISO 10474, Steel and steel products — Inspection documents
ISO 11484, Steel tubes for pressure purposes — Qualification and certification of non-destructive testing (NDT)
personnel
ISO 13665, Seamless and welded steel tubes for pressure purposes — Magnetic particle inspection of the tube
body for the detection of surface imperfections
ISO 13678, Petroleum and
...