GS 102-1
Specification for OCTG
Seamless Casing and Tubing
[ISO 11960 & API 5CT]
Issue: Feb 2001
Document Number: GS 102-1
Document Title: Specification for OCTG
Seamless Casing and Tubing [ISO 11960 &
API 5CT]
Issue Date: February 2001
Regional Applicability: Worldwide
Latest Amendment Date: NA
Document Custodian: Steve Morey, UTG
Houston, Tubulars Team
Issued by:
Technical Integrity, Supply Chain Management, BP Exploration Operating Co. Ltd, Chertsey Rd,
Sunbury-on-Thames, Middlesex, TW16 7LN, United Kingdom.
Tel: +44 (0)1932 764067. Fax: +44 (0)1932 764077.
Copyright © BP Amoco plc and BP International Ltd
All rights reserved. The information contained in this document is subject to the terms and conditions
of the agreement or contract under which the document was supplied to the recipient’s organisation.
None of the information contained in this document shall be disclosed outside the recipient’s own
organisation unless the terms of such agreement or contract expressly allow.
Specification for OCTG Seamless Casing and Tubing : Issue Feb 2001
CONTENTS
1
SCOPE..................................................................................................................................1
2
REFERENCES .......................................................................................................................1
3
DEFINITIONS ........................................................................................................................1
4
MANUFACTURER .................................................................................................................1
5
MANUFACTURING PROCEDURE SPECIFICATION ...............................................................2
6
MANUFACTURING PROCEDURE QUALIFICATION TEST .....................................................2
7
PURCHASE ORDER..............................................................................................................2
8
PURCHASER SURVEILLANCE .............................................................................................2
9
MATERIAL ............................................................................................................................2
9.1
9.2
9.3
9.4
10
DIMENSIONS ........................................................................................................................3
10.1
10.2
10.3
10.4
11
Non-Standard Dimensions.......................................................................................3
Range Lengths.........................................................................................................3
Jointers....................................................................................................................3
Grinding ...................................................................................................................3
MECHANICAL TESTING .......................................................................................................3
11.1
11.2
12
Material Type............................................................................................................2
Straightening ...........................................................................................................2
Couplings.................................................................................................................2
Repair ......................................................................................................................2
Charpy V-Notch Requirements.................................................................................3
Sulfide Stress Cracking (SSC) Test..........................................................................4
NON-DESTRUCTIVE INSPECTION........................................................................................4
12.1
12.2
12.3
12.4
12.5
Capabilities of Non-Destructive Inspection Techniques..........................................4
Test Methods ...........................................................................................................4
Calibration & Repeatability Checks..........................................................................5
Wall Thickness Examination....................................................................................5
Records of Tests......................................................................................................5
13
DRIFTING .............................................................................................................................5
14
COUPLING ASSEMBLY AND SURFACE FINISH...................................................................6
14.1
14.2
14.3
14.4
14.4.1
14.5
Contamination..........................................................................................................6
13Cr Materials..........................................................................................................6
End Finishing ...........................................................................................................6
Thread Protectors....................................................................................................7
Thread protectors shall comply with the following: ........................................................7
Pipe Coating ............................................................................................................7
15
MARKING.............................................................................................................................7
16
HANDLING AND STORAGE..................................................................................................7
17
TEST CERTIFICATES ...........................................................................................................7
i
Specification for OCTG Seamless Casing and Tubing : Issue Feb 2001
1
2
SCOPE
1.1
This Specification gives technical requirements for OCTG seamless casing and tubing to
be manufactured and supplied for use throughout BP.
1.2
This Specification is applicable to ISO 11960 (API 5CT) material grades and certain BP
approved proprietary non-sour service grades with specified minimum yield strengths up to
and including 125,000 psi.
1.3
The requirements of this specification are mainly supplementary to the requirements of
ISO 11960 (API 5CT).
REFERENCES
Unless stated otherwise in writing, the latest editions of the following specifications shall apply:
API 5CT:
Specification for Casing and Tubing.
API BUL 5C3:
Bulletin on Formulas and Calculations for Casing, Tubing, Drill Pipe and
Line Pipe Properties.
EN 10204:
Metallic Products – Types of Inspection Documents.
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 9001:
ISO 10400:
Quality Management Systems – Requirements.
Petroleum and Natural Gas Industries – Formulae and Calculation for
Casing, Tubing, Drill Pipe and Line Pipe Properties.
ISO 11960:
Petroleum and Natural Gas Industries – Steel Pipes for Use as Casing
or Tubing for Wells.
NACE TM-01-77: Test Method – Testing of Metals for Resistance to Sulfide Stress
Cracking at Ambient Temperatures.
TDR 001:
Technical Documentation Requirements: Seamless OCTG – Mill
Manufacture.
PST 001:
Purchaser Surveillance Tasks: Seamless OCTG – Mill Manufacture.
3
DEFINITIONS
Connection Licensor:
Organisation owning the rights to the connection design or their
designated agent.
Manufacturer:
The organisation responsible for the manufacture of seamless
OCTG to meet the requirements of this Specification.
Proprietary connection: A non-API connection.
Purchaser:
TDR:
PST:
4
BP or other organisation approved to purchase seamless OCTG
on behalf of BP.
Technical Documentation Requirements: A document produced
by the Purchaser that details the various technical document
submissions and related actions required.
Purchaser Surveillance Tasks: A document produced and used by
the Purchaser that identifies the surveillance tasks to be
performed at the Manufacturer’s works by a Purchaser nominated
inspection body.
MANUFACTURER
The Manufacturer of OCTG seamless casing and tubing shall possess ISO 9001 certification, or
Purchaser approved equivalent, and an API 5CT license.
1
Specification for OCTG Seamless Casing and Tubing : Issue Feb 2001
5
MANUFACTURING PROCEDURE SPECIFICATION
The Manufacturer shall produce a Manufacturing Procedure Specification (MPS) that details all
the processes, technical controls, tests and inspections to be performed by the Manufacturer to
ensure product consistency and compliance with the order requirements.
Note: If required, a guidance document for producing an MPS can be obtained from the
Purchaser on request.
6
7
MANUFACTURING PROCEDURE QUALIFICATION TEST
6.1
The Manufacturer shall perform a Manufacturing Procedure Qualification Test (MPQT) on
the first pipe produced of each size, weight and grade, which is intended for the order.
6.2
The MPQT pipes shall be subjected to the inspection and testing requirements of
ISO 11960 (API 5CT) and this Specification.
6.3
One set of production mechanical tests shall be performed on test specimens taken from
each end of the MPQT pipe. For single lengths of pipe with specified minimum yield
strengths 80,000 psi and above, and for all grades where pipes are rolled in double
lengths, an additional set of production mechanical tests shall be performed on test
specimens taken from the centre of the pipe.
6.4
As part of the MPQT, the Manufacturer shall identify the types of defects that may be
produced by the manufacturing processes used; see also Section 12.1.
PURCHASE ORDER
PST 001 and TDR 001 shall supplement the purchase order for casing and tubing.
8
9
PURCHASER SURVEILLANCE
8.1
At the Purchaser’s request, the Manufacturer shall allow access to the Purchaser (or
designated agent) for the surveillance of manufacturing and inspection activities at the
Manufacturer’s works. If applicable, and should the Purchaser request it, the Manufacturer
shall also arrange access for the surveillance of manufacturing and inspection activities
performed by the Manufacturer’s suppliers.
8.2
Surveillance shall be as described in PST 001 and TDR 001.
MATERIAL
9.1
Material Type
9.1.1 Material with yield or tensile strengths different than ISO 11960 (API 5CT) shall be
manufactured to all the ISO/API requirements that apply. Performance calculations shall
comply with ISO 10400 (API Bul 5C3) unless otherwise specified on the purchase order.
9.2
9.1.2
Grade N80 shall be Type Q unless otherwise approved by the Purchaser.
9.1.3
Grade T95 shall be Type 1 unless otherwise approved by the Purchaser.
9.1.4
Grade Q125 shall be Type 1 unless otherwise approved by the Purchaser.
Straightening
Grades C90 and T95 shall be either, cold rotary straightened followed by stress relief at
30-55°C (50-100°F) below the final specified temper temperature, or hot rotary
straightened with an exit temperature not more than 165°C (300°F) below the final
specified temper temperature.
9.3
Couplings
Centrifugal cast couplings are not acceptable.
9.4
Repair
Welding of the material for repair or other purposes shall not be permitted.
2
Specification for OCTG Seamless Casing and Tubing : Issue Feb 2001
10
DIMENSIONS
10.1 Non-Standard Dimensions
OCTG seamless casing and tubing with different dimensions than ISO 11960 (API 5CT)
shall be manufactured to all the ISO/API requirements that apply.
Performance
calculations shall comply with ISO 10400 (API Bul 5C3) unless otherwise specified on the
purchase order.
10.2 Range Lengths
The maximum pipe length for Range 3 shall be 42.5 feet unless otherwise specified in the
purchase order.
10.3 Jointers
Casing or tubing jointers shall not be used.
10.4 Grinding
Ground areas beneath couplings shall not be permitted.
11
MECHANICAL TESTING
11.1 Charpy V-Notch Requirements
11.1.1 Pipe grades in ISO 11960 (API 5CT) Groups 1, 2 and 3 shall be impact tested in
accordance with ISO 11960 (API 5CT) Annex A.9 (SR16), except as modified in this
Specification.
11.1.2 Non-ISO/API proprietary grades shall meet the same requirements as the
equivalent ISO/API grade with the same specified minimum yield strength (SMYS), unless
otherwise agreed between the Purchaser and Manufacturer.
11.1.3 The hierarchy for test specimen orientation and size shall be as specified in
Table 1 (not the same as the Table in ISO 11960 (API 5CT)).
11.1.4 The impact absorbed energy acceptance values for both pipe and coupling
material shall be as specified in Table 2 unless the pipe or coupling stock has a wall
thickness greater than 0.750 in., in this case the absorbed energy requirements shall be
agreed between the Purchaser and Manufacturer.
11.1.5 Test temperatures for pipe to be used in the Arctic shall be -46°C (-50°F); the test
temperatures for pipe to be used in any other location shall be -10°C (14°F), unless
otherwise specified on the purchase order.
11.1.6 The reduction factors as specified in ISO 11960 (API 5CT) Tables C.9 and E.9
shall be applied.
Table 1 - Hierarchy of Test Specimen Orientation and Size
Choice
Orientation
Size
st
Transverse
Full
nd
Longitudinal
Full
rd
Transverse
¾
th
Longitudinal
¾
th
Transverse
½
th
Longitudinal
½
1
2
3
4
5
6
3
Specification for OCTG Seamless Casing and Tubing : Issue Feb 2001
Table 2: Full Size Charpy V-Notch Absorbed Energy Requirements
Test Temperature –10°C
Test Temperature –46°C
Grade
Minimum
Average
J (ft-lbs)
Minimum
Individual
J (ft-lbs)
Minimum
Average
J (ft-lbs)
Minimum
Individual
J (ft-lbs)
J55 & K55
27 (20)
18 (13)
20 (15)
14 (10)
M65
41 (30)
27 (20)
20 (15)
14 (10)
L80 13Cr
41 (30)
27 (20)
20 (15)
14 (10)
L80*, N80, C90,
C95 & T95
54 (40)
37 (27)
20 (15)
14 (10)
P110
68 (50)
45 (33)
20 (15)
14 (10)
Q125
75 (55)
50 (37)
20 (15)
14 (10)
* L80 Type 1 and 9Cr. See separate requirements for L80 13Cr.
11.2 Sulfide Stress Cracking (SSC) Test
11.2.1 This test only applies to ISO/API Grades C-90 and T-95.
11.2.2 One test specimen shall be taken from each of three pipes selected from the front,
middle and end of each heat, i.e., three test specimens shall be taken per heat.
11.2.3 The specimens shall be tested in accordance with NACE TM-01-77 Method A.
11.2.4 For acceptance of the heat, each specimen tested must demonstrate a minimum
SSC threshold value of 90% SMYS.
11.2.5 If any initial test specimen fails, a retest may be performed on two further test
specimens taken from the area of the pipe adjacent to where the initial failed test specimen
was taken. The heat shall be rejected if either of the retest specimens fails.
12
NON-DESTRUCTIVE INSPECTION
12.1 Capabilities of Non-Destructive Inspection Techniques
As part of the MPQT, the Manufacturer shall identify the capability of the proposed nondestructive test techniques and test equipment to detect the defects identified as part of
the MPQT; see Section 6.
12.2 Test Methods
12.2.1 Automatic non-destructive inspection by both electromagnetic and ultrasonic
techniques shall be performed on pipe with specified minimum yield strengths 65,000 psi
and above. Pipe with specified minimum yield strengths below 65,000 psi shall be tested
by using either automatic electromagnetic or ultrasonic techniques. All testing shall be
performed in accordance with the requirements of ISO 11960 (API 5CT) and this
Specification unless otherwise specified in the purchase order.
12.2.2 Casing and tubing with minimum specified yield strengths from 40,000 to
55,000 psi and Grade N-80 Type 1 shall also be inspected in accordance with the
requirements of ISO 11960 (API 5CT) Annex A.1 (SR1), using OD longitudinal and
transverse notches and ID longitudinal notches; all notches shall be L3 (10%).
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Specification for OCTG Seamless Casing and Tubing : Issue Feb 2001
12.2.3 Casing and tubing with minimum specified yield strengths from 80,000 to
95,000 psi, and Grade P110 material, shall also be inspected in accordance with the
requirements of ISO 11960 (API 5CT) Annex A.2 (SR2), using OD and ID longitudinal and
transverse notches.
Notches shall be L2 (5%) except that the ID notches for
electromagnetic testing may be relaxed to L3 (10%) at the Manufacturer’s discretion.
12.3 Calibration & Repeatability Checks
12.3.1 Calibration of non-destructive inspection equipment with the reference standard
shall be fully dynamic using the same size, material type and weight as the pipe to be
processed.
12.3.2 Prior to any production run, a repeatability check of the automatic non-destructive
inspection equipment shall be performed to demonstrate a consistent repeatable response
from the calibration reflectors.
12.3.3 Repeatability checks shall be performed by passing the calibration reference
standard through the system, at the normal production travel speed, a minimum of 10
times with the pipe rotated 90° for each pass.
12.3.4 The alarm level for the automatic ultrasonic production examination shall be set at
an agreed level below the lowest amplitude signal produced by any of the standard
reflectors during the repeatability check.
12.4 Wall Thickness Examination
12.4.1 The wall thickness examination by automatic ultrasonic examination shall cover
100% of the pipe body surface unless otherwise agreed between the Purchaser and the
Manufacturer.
12.4.2 Where the Manufacturer can provide statistical evidence of a consistent wall
thickness produced by the mandrel/ plug mill process, the wall thickness examination
coverage may be reduced to 25%, subject to Purchaser approval.
12.4.3 The remaining wall thickness of all areas dressed by grinding (grinds) shall be
individually verified.
12.4.4 100% of the pipe volume shall be examined by automatic ultrasonic inspection to
verify the wall thickness in a situation where the internal pipe surface has been ground at a
distance greater than 400 mm (16 in.) from the pipe ends, or where more than 10% of the
external pipe surface area has been ground.
12.5 Records of Tests
Paper chart or electronic data records shall be available for all automatic non-destructive
inspection and calibration operations and shall be identifiable to the actual pipe tested.
13
DRIFTING
13.1 Pipe Label 1 : 7-5/8 in and below shall be drift tested with a 1067 mm (42 in) long drift. For
pipe sizes Label 1 : 7-5/8 and above the minimum length of drift shall be 305 mm (12 in).
13.2 Chromium plated or nylon drifts shall be used for 13Cr pipes.
13.3 Where drift testing is performed by mechanical means, the Manufacturer shall demonstrate
to the satisfaction of the Purchaser that the pipes may also be drifted manually.
13.4 Alternative drift testing shall be performed on all pipes specified in ISO 11960 (API 5CT)
Tables C.32 and E.32.
13.5 Alternative drift testing of non-ISO/API sized pipes shall be as specified in Table 3.
Alternative drift requirements for pipes not listed in Table 3 will be specified in the purchase
order.
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Specification for OCTG Seamless Casing and Tubing : Issue Feb 2001
Table 3 : Alternative Drift Requirements
14
Label 1
Product
Mass
(lb/ft)
Drift
Diameter
(inches)
13-5/8
88.2
12.250
11-7/8
71.8
10.625
10-3/4
60.7
9.581
9-7/8
68.8
8.375
9-7/8
65.2
8.359
9-7/8
62.8
8.500
7-5/8
39.0
6.500
7
38.0
5.875
5-1/2
26.0
4.500
5-1/2
23.0
4.591
5-1/2
20.0
4.699
4-1/2
13.5
3.841
4-1/2
12.6
3.879
COUPLING ASSEMBLY AND SURFACE FINISH
14.1 Contamination
The internal and external surfaces of supplied pipes shall be free from loose mill scale, dirt,
oil, grease or other extraneous material which may be detrimental to the satisfactory
inspection, coating, running or in-service operation.
14.2 13Cr Materials
14.2.1 The internal surface of pipes manufactured using 13Cr material shall be blast
cleaned to ISO 8501-1 grade Sa2½ using garnet abrasive or a Purchaser approved
alternative. Pickling of 13Cr material is not permitted as an alternative to internal blast
cleaning.
14.2.2 A Purchaser approved anti-corrosion coating/oil film shall be applied to the internal
surface immediately after blast cleaning. The coating/oil layer shall be uniform in
appearance, i.e., no pooling or excess coating/oil shall be present in the bore of the pipe.
14.3 End Finishing
14.3.1 All connections shall have a surface treatment applied using a process that is
approved by the Purchaser.
14.3.2 In addition to clause 14.3.1, proprietary connections shall only receive surface
treatments that are acceptable to the Connection Licensor.
14.3.3 Carbon steel connections shall be phosphated, unless otherwise agreed by the
Purchaser.
14.3.4 13Cr steel couplings shall be copper plated.
Connection Licensor shall be used, where applicable.
A process acceptable to the
14.3.5 The Purchaser shall approve the type of mill end thread compound used for T&C
connections.
6
Specification for OCTG Seamless Casing and Tubing : Issue Feb 2001
14.3.6 The mill end of proprietary T&C connections shall be assembled with a torque/turn
monitor. The assembly shall be fully traceable by using test charts/electronic records, pipe
numbers, etc.
14.3.7 For all connections, the field end pin and coupling shall be coated with a
Purchaser approved, metal free storage compound, unless otherwise specified on the
purchase order.
14.4 Thread Protectors
14.4.1 Thread protectors shall comply with the following:
a.
b.
c.
Label 1 : 5 pipe and above, Drilltec ACT (or ESP-S if ACT is not available) or MSI Ultra
closed-end liftable type thread protectors shall be used.
For pipe sizes below Label 1 : 5, Drilltec STP or MSI Ultra closed-end non-liftable type
thread protectors shall be used.
For pipe of any size that has flush or semi-flush connections, Drilltec STP or MSI Ultra
closed-end non-liftable type thread protectors shall be used.
14.4.2 A 3 mm (1/8 in.) weep hole shall be present in each closed-end type protector to
allow venting of the pipe bores.
14.5 Pipe Coating
Standard mill varnish shall be applied to the external surface of pipes unless otherwise
specified in the purchase order.
15
MARKING
Marking and colour coding shall be as specified in ISO 11960 (API 5CT) and the purchase order.
16
HANDLING AND STORAGE
Where 13Cr steels are being used, the Manufacturer shall provide the proposed handling and
storage protection procedure.
17
TEST CERTIFICATES
Test certificates and traceability shall be in accordance with ISO 11960 (API 5CT) Annex A.8
(SR15) and EN 10204 3.1.B for all materials, unless otherwise specified in the purchase order.
7