EN ISO 11960:1998
(Main)Petroleum and natural gas industries - Steel pipes for use as casing or tubing for wells (ISO 11960:1996)
Petroleum and natural gas industries - Steel pipes for use as casing or tubing for wells (ISO 11960:1996)
Migrated from Progress Sheet (TC Comment) (2000-07-10): Changed to PQ following TC res 39/1995.
Erdöl- und Erdgasindustrien - Stahlrohre zur Verwendung als Futter- oder Steigrohre für Bohrungen (ISO 11960:1996)
1.1 Diese Internationale Norm legt die technischen Lieferbedingungen für Stahlrohre (Futterrohre, Steigrohre und Liner), kurze Verbindungsrohre und Rohrverbinder fest. Diese Internationale Norm gilt für folgende Verbindungen nach ISO 10422 für: - Futterrohre mit Rundgewinde (kurz); - Futterrohre mit Rundgewinde (lang); - Futterrohre mit Buttress-Gewinde; - Futterrohre mit Extremeline-Gewinde; - Steigrohre ohne Anstauchung; - Steigrohre mit Anstauchung nach außen; - Steigrohre mit Integral-Verbindung.
Industries du pétrole et du gaz naturel - Tubes en acier utilisés comme tubes de cuvelage ou tubes de production dans les puits (ISO 11960:1996)
Petroleum and natural gas industries - Steel pipes for use as casing or tubing for wells (ISO 11960:1996)
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
SIST EN ISO 11960:2001
01-junij-2001
Petroleum and natural gas industries - Steel pipes for use as casing or tubing for
wells (ISO 11960:1996)
Petroleum and natural gas industries - Steel pipes for use as casing or tubing for wells
(ISO 11960:1996)
Erdöl- und Erdgasindustrien - Stahlrohre zur Verwendung als Futter- oder Steigrohre für
Bohrungen (ISO 11960:1996)
Industries du pétrole et du gaz naturel - Tubes en acier utilisés comme tubes de
cuvelage ou tubes de production dans les puits (ISO 11960:1996)
Ta slovenski standard je istoveten z: EN ISO 11960:1998
ICS:
75.180.10 Oprema za raziskovanje in Exploratory and extraction
odkopavanje equipment
77.140.75 Jeklene cevi in cevni profili Steel pipes and tubes for
za posebne namene specific use
SIST EN ISO 11960:2001 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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SIST EN ISO 11960:2001
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SIST EN ISO 11960:2001
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SIST EN ISO 11960:2001
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SIST EN ISO 11960:2001
INTERNATIONAL Is0
11960
STANDARD
First edition
1996-07-o 1
Petroleum and natural gas industries -
Steel pipes for use as casing or tubing for
wells
Industries du p&role et du gaz nature/ - Tubes en acier utilis& comme
tubes de cuvelage ou tubes de production dans /es puits
Reference number
IS0 11960:1996(E)
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SIST EN ISO 11960:2001
IS0 11960:1996(E)
Page
Contents
........................................................................................... 1
1 Scope
.................................................................. 1
2 Normative references
2
3 Definitions .
4 Information to be supplied by the purchaser . 3
3
4.1 Casing .
4
4.2 Tubing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5
5 Process of manufacture .
51 . General . 5
52 . Heat treatment . 5
5.3 Straightening . 6
........................................................................... 6
54 . Traceability
................................................................. 6
6 Material requirements
........................................................ 6
61 . Chemical requirements
................................... 6
62 . Mechanical properties requirements
21
7 Dimensions, masses, tolerances and pipe ends. .
7.1 Dimensions and masses . 21
............................................................................... 21
7.2 Diameter
...................................................................... 21
7.3 Wall thickness
21
7.4 Mass .
33
7.5 Length .
33
7.6 Casing jointers .
7.7 Height and trim of electric weld flash . 33
7.8 Straightness . 34
................................................................ 34
7.9 Drift requirements
............................... 34
7.10 Tolerances on dimensions and masses
35
7.11 Pipe ends .
0 IS0 1996
All rights reserved. Unless otherwise specified, no part of this publication may be repro-
duced or utilized in any form or by any means, electronic or mechanical, including photo-
copying and microfilm, without permission in writing from the publisher.
International Organization for Standardization
Case Postale 56 l CH-1211 Geneve 20 l Switzerland
Printed in Switzerland
ii
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SIST EN ISO 11960:2001
I
@ IS0 IS0 11960:1996(E)
7.12 Coupling make-up and thread protection . 36
8 Couplings . 36
Material
8.1 . 36
82 . Process of manufacture . 37
8.3 Performance properties . 37
84 . Mechanical properties . 37
85 . Dimensions and tolerances . 37
86 . Regular couplings . . 37
87 . Special clearance couplings - Groups 1, 2 and 3. .
39
8.8 Combination couplings .
39
8.9 Reducing couplings
.............................. ................................ 40
8.10 Seal-ring couplings . . 40
8.11 Special bevel couplings - Groups 1, 2 and 3 . 40
8.12 Threading . 40
8.13 Surface inspection . 40
8.14 Measurement of imperfection . 40
8.15 Repair and removal of imperfections and defects. .
41
8.16 Thread plating - Group 4 .
41
8.17 Couplings and coupling blank protection - Group 4. . 41
9 Inspection and testing
........................................... ...................... 41
9.1 General . . 41
9.2 Testing of chemical composition . . 42
9.3 Testing of mechanical and technological properties . 43
94 . Hydrostatic test . 49
95 . Dimensional testing . .
51
96 . Visual inspection . .
53
9.7 Non-destructive inspection
............................... .................... 53
Test methods and results
98 . . 55
99 . Invalidation of tests . . 57
9.10 Retests . . 57
10 Marking . . . 58
10.1 General . . 58
10.2 Couplings and connectors .
59
10.3 Pipe and pup-joints . .
59
10.4 Die-stamp marking requirements.
................................... .... 61
10.5 Die-stamp marking placement
............................................. 61
10.6 Paint-stencil marking .
.......................... 62
10.7 Colour code identification - All groups
............................... 62
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SIST EN ISO 11960:2001
IS0 11960:1996(E) @ IS0
10.8 Thread marking - All groups . 62
10.9 Triangle make-up marking . 63
................................ 63
10.10 Pipe processor markings - All groups
..................... 63
10.11 Alternate drift casing markings - All groups.
................................................................ 63
11 Coating and protection
.......................................................... 63
11.1 Coatings -All groups
................................................................. 63
11.2 Thread protectors
....... 64
12 Documents .
64
12.1 Certification .
................................. 64
12.2 Certification requirements - Group 4
12.3 Groups 1, 2 and 3 . 64
12.4 Retention of records . . . 64
Annexes
65
A Dimensions and end finish
70
B Supplementary requirements
86
C Purchaser inspection
87
D Bibliography
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SIST EN ISO 11960:2001
@ IS0 IS0 11960:1996(E)
Foreword
IS0 (the International Organization for Standardization) is a worldwide
federation of national standards bodies (IS0 member bodies). The work of
preparing International Standards is normally carried out through IS0
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. IS0
collaborates closely with the International Electrotechnical Commission
(IEC) on all matters of electrotechnical standardization.
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.
International Standard IS0 11960 was prepared by Technical Committee
lSO/TC 67, Materials, equipment and offshore structures for petroleum
and natural gas industries, Subcommittee SC 5, Casing, tubing and drill
pipe.
This first edition cancels and replaces IS0 2645:1975, which has been
technically revised.
Annexes A, B and C form an integral part of this International Standard.
Annex D is for information only.
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SIST EN ISO 11960:2001
IS0 11960:1996(E) @ IS0
Introduction
This International Standard includes requirements of various nature. These
are identified by the use of certain words or phrases.
- 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.
cases, this lnternatio nal Stand ard offers Alternative
In addition, in c ertain
offer different option s, either:
requirements. These
At purchaser ’s discretion in which case such option shall be men-
tioned on the purchase order. These cases are recognized by the use
of the words or phrases such as alternative or at purchaser ’s dis-
cretion.
At manufacturer ’s discretion in which case such option shall be no-
tified to the purchaser. Such cases are identified by the use of the
phrase at manufacturer ’s discretion.
By agreement between purchaser and manufacturer. Such cases
are recognized by the use of the phrase by agreement between
interested parties.
This International Standard, when this phrase is used, intends to
either
waive the application of a requirement (either mandatory or rec-
ommended) and leave it to both purchaser and manufacturer to use
the requirement or not;
or
rement(s), the selection of which
offer one (or several) alterna tive requi
is left to both purchaser and ma nufac turer.
vi
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SIST EN ISO 11960:2001
INTERNATIONAL STANDARD @ IS0 IS0 11960:1996(E)
Petroleum and natural gas industries - Steel pipes for use
as casing or tubing for wells
1.3 Supplementary requirements, that may be
1 Scope
agreed between interested parties, for non-
destructive inspection, coupling blanks, upset casing,
1.1 This International Standard specifies the techni-
electric-welded casing, impact testing, seal-ring coup-
cal delivery conditions for steel pipes (casing, tubing
lings and certificates are specified in annex B.
and liners), pup-joints and connectors.
This International Standard is applicable to the follow-
ing connections in accordance with IS0 10422:
2 Normative references
- short, round-thread casing;
The following standards contain provisions which,
through reference in this text, constitute provisions of
- long, round-thread casing;
this International Standard. At the time of publication,
- buttress-thread casing;
the editions indicated were valid. All standards are
- extreme-line casing;
subject to revision, and parties to agreements based
on this International Standard are encouraged to in-
- non-upset tubing;
vestigate the possibility of applying the most recent
- external-upset tubing;
editions of the standards indicated below. Members
of IEC and IS0 maintain registers currently valid Inter-
- integral-joint tubing.
national Standards.
The applicable types of end finishing for each size are
IS0 31-O: 1992, Quantities and units - Part 0: General
described in annex A (tables A.1 to A.3).
principles.
For such connections, this International Standard
IS0 643: 1983, Steels - Micrographic de termina tjon
specifies the technical delivery conditions for coup-
of the ferrific or austenjtic grain size.
lings and thread protection.
IS0 6506: 1981, Metallic materials - Hardness test -
Threading requirements are not considered in this In-
Brine/l test.
ternational Standard. Dimensional requirements on
threads and thread gauges, stipulations on gauging
IS0 6508: 1986, Metallic materials - Hardness test -
practice, gauge specifications, as well as instruments
Rockwelltest(scalesA-B-C-D-E-F-G-H-K).
and methods for inspection of threads are given in
IS0 10422.
IS0 6892: 1984, Metallic materials - Tensile testing.
This International Standard may also be used for tubu-
IS0 7500-I :I 986, Metallic materials - Verification of
lars with connections not covered by IS0 standards.
static uniaxial testing machines - Part I: Tensile
testing machines.
I.2 The products described by this International
IS0 10422:1993, Petroleum and natural gas indus
Standard are gathered in four groups as follows.
tries - Threading, gauging, and thread inspection of
casing, tubing and line pipe threads - Specification.
- Group I: all casing and tubing in grades H, J, K
and N.
lSO/TR 9769:1991, Steel and iron - Review of
- Group 2: all casing and tubing in restricted yield available methods of analysis.
strength grades C, L and T.
API Bul 5A2:1988, Bulletin on Thread Compounds for
- Group 3: all seamless casing and tubing and
Casing, Tubing and Line Pipe.
139,70 mm and larger electric-welded (EW) casing in
high strength grade P.
API Bul 5C2:1987, Bulletin on Performance Properties
- Group 4: all special service casing in grade Q. of Casing, Tubing and Drill Pipe.
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SIST EN ISO 11960:2001
3.6 coupling stock: Tubular component used for
ASTM A370-92, Test Methods and Definitions for Me-
the manufacture of coupling blanks.
chanical Testing of Steel Products.
ASTM A91 9-84 (1993), Terminology relating to Heat 3.7 coupling blank: Material used to produce an
Treatment of Metals. individual coupling.
NOTE 1 Coupling blanks may be obtained from coupling
ASTM E23-94a, Test Methods for Notched Bar Impact
stock, forgings or centrifugal castings.
Testing of Metallic Materials.
ASTM E83-94, Practice for Verification and Classifi-
3.8 casing: A pipe run from the surface and in-
cation of Extensometers.
tended to line the walls of a drilled well.
ASTM El 65-94, Practice for Liquid Penetrant Inspec-
3.9 tubing: A pipe placed within a well to produce
tion.
well fluids or to inject fluids.
ASTM E213-93, Practice for Ultrasonic Inspection of
3.10 plain-end casing liner: Casing provided un-
Metal Pipe and Tubing.
threaded with a wall thickness often greater than that
specified for J55.
ASTM E273-93, Practice for Ultrasonic Examination of
Longitudinal Welded Pipe and Tubing.
3.11 pup-joint: Length of casing, tubing or plain-end
ASTM E309-93a, Practice for Eddy-Current Examin- casing liner shorter than Range 1.
ation of Steel Tubular Products Using Magnetic Satu-
ration. 3.12 seamless pipe: A wrought steel tubular prod-
uct made without a welded seam, manufactured by
ASTM E570-91, Practice for Flux Leakage Examination
hot working steel and, if necessary, by subsequently
of Ferromagnetic Steel Tubular Products.
cold finishing the hot-worked tubular product to pro-
duce the desired shape, dimensions and properties.
ASTM E709-95, Practice for Magnetic Particle Examin-
a tion.
3.13 electric-welded pipe: Pipe having one longi-
tudinal seam formed by electric-resistance or electric-
NACE TM-01 -77:1986, Testing of Metals for Resist-
induction welding, without the addition of filler metal,
ance to Sulfide Stress Cracking at Ambient Tempera-
wherein the edges to be welded are mechanically
ture.
pressed together and the heat for welding is gener-
ated by the resistance to flow of electric current.
ASNT-TC-1 A: 1984, Recommended Practice for Certifi-
cation of NDT Personnel.
3.14 thread protector: Cap or insert used to protect
threads and seals during handling, transportation and
storage.
3 Definitions
3.15 special processes: Final operations which are
For all terms related to heat treatment operations, the
performed during pipe manufacturing that affect prod-
definitions in ASTM A91 9 apply.
uct attributes, except chemistry and dimensions.
For the purposes of this International Standard, the
NOTE 2 The special processes are:
following definitions apply.
3.1 product: Pipe, coupling, connector, coupling
Manufacturing
Special processes
condition
stock and coupling blank, either individually or collec-
tively as applicable.
Seamless:
as-rolled Final reheating practice and hot sizing or
3.2 connection: Threaded assembly of tubular com-
stretch reducing. If applicable, upset-
ponents.
ting, cold finishing.
heat treated
Heat treatment
3.3 pipe: Casing, tubing, plain-end casing liners, pup-
Electric
joints and connectors, individually or as a group, as ap-
welded:
plica ble.
as-rolled Sizing and seam welding. If applicable,
seam heat treatment and upsetting.
3.4 coupling: Internally threaded cylinder for joining
two lengths of threaded pipe.
heat treated Seam welding and full body heat treat-
ment
3.5 connector: One-piece tubular section not includ-
ing pipe or couplings, used for the purpose of joining
or changing from one size, mass or type of thread
3.16 interested parties: The manufacturer and the
connection to the same or another size, mass or type
purchaser of the products.
of threaded connection.
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SIST EN ISO 11960:2001
@ IS0
IS0 11960:1996(E)
4 information to be supplied by the purchaser
4.1 Casing
4.1.1 In placing orders for pipe to be manufactured in accordance with this International Standard, the purchaser
shall specify the following on the purchase order.
Stipulation Section
International Standard IS0 11960
I
Quantity
Type of pipe or couplings:
Casing
Threaded or plain-end 7.1 1
I
Type of connection - round (short or long), buttress,
extreme-line threads, or other connection
table A.1, 7.11
~~
With or without couplings 7.1 1
I
Special clearance couplings
tables 27, 28, A. 1, 8.7
~~
Liners table A.2, 7.11
Size designation or outside diameter tables A. 1, A.2
Nominal mass or wall thickness tables A. 1, A.2
Grade and type where applicable tables A.1, A.2
Length range 7.5, table 24
Seamless or electric welded 5.1, table 1
Material certification 12.1, SR15
I
Delivery date and shipping instructions
Inspection by purchaser annex C
I
4.1.2 The purchaser should also state on the purchase order his requirements concerning the following. stipu-
lations, which are optional with the purchaser.
Stipulation Section
Heat treatment 5.2
I
Heat and supplementary analyses I 9.2
7.6
Casing jointers
I
Casing with couplings detached 7.12
I
Alternate drifting requirements 7.9
I
Coupling make-up (other than power-tight) 7.12
I
Pipe coatings 11.1
I-
Seal-ring couplings 8.10, SR13.1, SR13.2
I
Coupling blanks 8.1, SR9
I
Statistical impact testing - Q125 grade 6.2.3.6, SR12
I
Additional markings clause 10
I
The following stipulations are subject to agreement between interested parties.
4.1.3
Section
Stipulation
I
9.4
Hydrostatic pressure test for handling-tight make-up, connectors and group 4
pup-joints
I
Alternate hydrostatic test pressures 9.4
I
Thread and storage compound 7.12
I
Thread protectors 11.2
I
Marking requirements 10.1
I
Non-destructive inspection 9.7, SRI, SR2 and SRI 1
Alternate chemical analysis procedures - Q125 grade 9.2
I
Reduced section tensile specimens - Q125 grade 9.3.3
I
Alternate F factor in SR12 - Q125 grade SRI 2.2
I
Cold rotary straightening - Q125 grade 5.3
I
3
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SIST EN ISO 11960:2001
IS0 11960:1996(E)
Coupling blanks - Q125 grade only SR9
Upset casing SRI0
- Q125 grade only
Electric-welded casing - Pl IO and Q125 grade SRI 1
Supplementary
8.16
Coupling thread plating - Q125 grade only
6.2.13
Sulfide stress cracking test - C90 and T95 grade
9.3.2.3
Additional hardness testing - C90 and T95 grade
Quality assurance requirements
(e.g. one of the IS0 9000 series)
4.2 Tubing
42.1 In placing orders for pipe to be manufactured in accordance with this International Standard, the purchaser
shall specify the following on the purchase order.
Stipulation Section
International Standard IS0 11960
Quantity
Type of pipe or couplings:
Tubing
I
table A.3
Non-upset, external-upset or integral-joint
Threaded, plain-end, or special end 7.11
I
With or without couplings 7.1 1
Special bevel couplings tables A.3 and 30, 8.11
Special clearance couplings tables A.3, 29, 30, 8.7
Size designation or outside diameter table A.3
Nominal mass or wall thickness table A.3
Grade table A.3
Length range 7.5, table 24
Seamless or electric welded 5.1, table 1
Material certification 12.1, SRI5
I
.~
Delivery date and shipping instructions
Inspection by purchaser annex C
4.22 The purchaser should also state on the purchase order his requirements concerning the following stipu-
lations, which are optional with the purchaser.
Stipulation Section
Heat treatment 5.2
Heat and supplementary analyses 9.2
Coupling make-up (other than power-tight) 7.12
Pipe coatings 11 .I
Seal-ring couplings
8.10, SR13.1, SR13.2
Tubing with couplings detached 7.12
Additional markings clause 10
42.3 The following stipulations are subject to agreement between interested parties.
4
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SIST EN ISO 11960:2001
@ IS0
IS0 11960:1996(E)
5 Controlled cooling is cooling from an elevated tempera-
5 Process of manufacture
ture in a predetermined manner to avoid hardening, crack-
ing or internal damage to produce a desired microstructure
5.1 General
or mechanical properties.
The various grades and groups of pipe furnished ac-
cording to this International Standard shall be made to
Table 1 - Process of manufacture and heat
a fine grain practice. Steel made to a fine grain prac-
treatment
tice contains one or more grain refining elements,
such as aluminium, niobium, vanadium or titanium in
Tempering
Manufacturing Heat
amounts intended to result in the steel having a fine
Group Grade temperature
Type
processl) treatment
min.
austenitic grain size.
“C
Pipe furnished according to this International Standard
H40 - SorEW none
shall be made by the seamless or electric weld pro-
J55 - SorEW none
cess as shown in table 1 and as specified on the pur-
2)
chase order. Pup-joints and connectors may be made
1 K55 - SorEW none ’ -
from standard casing or tubing or by machining heavy
2)
wall casing, tubing or bar stock. Couplings shall be
3)
manufactured by one of the processes listed in 8.2.
N80 - SorEW
Cold-drawn tubular products without appropriate heat
N80 Q SorEW QandT -
treatment are not acceptable.
L804’ 1 SorEW Q and T 566
L80 9Cr S Q and T5) 593
5.2 Heat treatment
L80 13Cr S 0 and T5) 593
5.2.1 General c90 1 s Q and T 621
2
c90 2 s Q and T 621
Product shall be heat treated in accordance with a
c95 - SorEW Q and T 538
documented procedure as stipulated in table 1 for the
T95 1 s Q and T
649
particular grade and type specified on the purchase
T95 2 s 0 and T 649
order. Heat-treated upset pipe shall be heat treated
the full length after upsetting. Pipe and coupling stock
3 PI10 - S or EW 6a 7, QandT -
requiring heat treatment shall be heat treated the full
length. Individually heat-treated coupling blanks are Q125 1 S or EW7) QandT -
acceptable. All pipe processed through a hot stretch
Q125 2 S or EW7)
QandT -
4
mill (i.e., stretch reduced) shall be considered normal-
Q125 3
S or EW7) QandT -
ized, provided the exit temperature be above the up-
0125 4
S or EW7) QandT -
per critical temperature (Ar3) for the steel being
processed, and the pipe be air cooled.
1) S = seamless process; EW = electric welded process.
2) Full-length normalized, normalized and tempered (N and T), or
quenched and tempered (Q and T), at the manufacturer ’s discretion or if
The weld seam of electric-welded pipe shall be heat
so specified on the purchaser order.
treated after welding to a minimum temperature of
3) Full-length normalized or normalized and tempered at the manufac-
538 “C or processed in such a manner that no untem-
turer ’s discretion.
pered martensite remains.
4) The manufacturer shall use a process that is documented to yield not
less than 50 % martensite.
NOTE 3 Ars refers to the critical temperature for the 5) Type 9Cr and 13Cr may be air quenched.
austenite-to-ferrite transformation on cooling. 6) Special chemical requirements for electric-welded Pl 10 casing are
specified in table 2.
7) Special requirements unique to electric-welded PI 10 and Q125 casing
are specified in annex B (SRl 1). When electric-welded PI 10 and 0125
5.2.2 Group 1
casing is furnished, the provisions of SRI 1 are automatically in effect.
Grade N80 pipe and coupling stock shall be normal-
ized or, at the manufacturer ’s discretion, shall be nor-
malized and tempered. Grade N80Q pipe and coupling
52.3 Group 2
stock shall be quenched and tempered (including the
interrupted quenching followed by controlled cooling
When requested by the purchaser, the manufacturer
method) the full length. Grade J55 and K55 casing and
shall produce evidence to show that the tempering
grade J55 tubing shall be heat treated if so specified
practice will result in the pipe attaining the minimum
on the purchase order.
tempering temperature.
NOTES
4 Interrupted quenching is quenching in which the pipe
5.2.4 Groups 3 and 4
being quenched is removed from the quenching medium
Pipe and couplings furnished to this International
while the pipe is at a temperature substantially higher than
Standard shall be quenched and tempered.
that of the quenching medium.
5
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SIST EN ISO 11960:2001
IS0 11960:1996(E) 0 IS0
5.4.2.2 Pipe - Group 4 manufactured to SRI2
5.3 Straightening
5.3.1 Groups 1 and 3
In addition to the requirements in 5.4.2.1, when SRI 2
is specified, the number shall identify the sequence in
No specific methods are required.
which the lengths were tempered in order to allow
retest per SR12.3.
5.3.2 Group 2
5.4.2.3 Coupling, pup-joint and connector
Grade L80 shall not be subjected to cold working after
material
the final tempering treatment, except for that which is
incidental to normal straightening operations. Grade
Each tube length of coupling, pup-joint or connector
C90 and T95 pipe may be subjected to cold rotary
material shall be uniquely numbered so that test data
straightening if, subsequent to the cold rotary straight-
may be related to individual lengths. When couplings,
ening operation, the pipe is heated to a minimum
coupling blanks, or pup-joint and connector material
temperature of 482 “C for stress relieving. When
are cut from material that has been treated full length,
necessary, light gag straightening for grade C90 and
the pieces shall be marked with the serial number of
T95 shall be permitted. Grade C95 pipe shall be sub-
the full length piece. When coupling, pup-joint, or con-
jected to no tensile or expansion cold working, except
nector material is heat treated in coupling blank or in-
for that which is incidental to normal straightening op-
dividual lengths, each heat treat lot (see 9.3.1.2.2)
erations, and to no more than 3 % compressive cold
shall be uniquely numbered. Additionally, when coup-
working, after the final tempering operation.
ling, pup-joint or connector material in coupling blank
or individual lengths is heat treated on a
...
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