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Specification for Seamless Line Pipe
Specification for Seamless Line Pipe 2 of 19
Table of Contents
1.0 SCOPE AND CONTENT ............................................................................................................................................................ 3 2.0 GENERAL ................................................................................................................................................................................. 3 3.0 STANDARDS ............................................................................................................................................................................ 4 4.0 MATERIALS AND MANUFACTURING REQUIREMENTS .......................................................................................................... 5 5.0 INSPECTION AND TESTING ..................................................................................................................................................... 7 6.0 COATING ............................................................................................................................................................................... 10 7.0 MARKING.............................................................................................................................................................................. 10 8.0 HANDLING, STORING AND SHIPPING .................................................................................................................................. 10 9.0 CERTIFICATION, TRACEABILITY, AND DOCUMENTATION ................................................................................................... 12 10.0 WARRANTY........................................................................................................................................................................... 13
Specification for Seamless Line Pipe 3 of 19
1.0 SCOPE AND CONTENT
This Project Specification defines the
minimum standards of quality and
acceptability governing the materials,
manufacturing, inspection, testing,
coating, marking, handling, storing and
shipping of seamless carbon steel pipe to
be operated at a maximum temperature
of 120ºF or less and suitable for service in
either a submarine or salty atmospheric
environment serving the Company’s
Development. “All pipe shall be suitable
for installation by the reeling method of
pipelay.”
2.0 GENERAL
2.1 Services
Vendor shall furnish all labor, materials,
tools and equipment, and perform all
operations and incidentals as required in
this Specification and in the Purchase
Order or Contract referencing this
Specification, including inspection and
testing. Personnel shall be fully qualified
to perform applicable services. Tools and
equipment shall be serviceable and
maintained in first class operating
condition.
2.2 Definitions
The following definitions shall apply: Company Vendor The manufacturer or
supplier of steel line pipe
Standards Industry codes, standards, and recommended practices referenced herein
Works The location(s) at which
manufacturing, inspection and testing are performed
Bid The quotation or proposal
submitted by Manufacturer or Vendor prior to award of the Purchase Order or Contract
2.3 Contents of Purchase Order or Contract
Where applicable, the following information will be specified on the Purchase Order or Contract: a. The quantity, size, wall thickness
and grade of pipe. b. Use of the reeling “method for
pipe installation, and any specific pipe requirements associated with reeling “(including coating).”
c. The point of delivery of the pipe. d. Any additional information (other
than that required by API Spec 5L) to be paint‐stenciled on the surface of the pipe.
e. “Any specific weldability and reelabilty test requirements”
f. “Any specific delivery conditions (including pipe required for steel catenary riser fabrication)”
g. “Condition of pipe ends (e.g. Beveled, plain, type of bevel protector, etc)”
Any additional requirements will either be specified in the Purchase Order or Contract, or in an addendum to this Specification.
Specification for Seamless Line Pipe 4 of 19
2.4 Vendor Representative
Vendor shall designate in writing to
Company an authorized representative to
serve as liaison with Company on matters
associated with this Specification and on
the Purchase Order or Contract
referencing this Specification. This
representative shall be designated prior to
the performance of services associated
with this Specification and the Purchase
Order or contract referencing this
Specification.
2.5 Responsibilities
This document is not intended to be all inclusive and the use of the guidelines set forth does not relieve Vendor of his responsibility to supply a product capable of performing its intended service. Responsibility for the proper interpretation of this Specification shall rest with the authorized representatives of Vendor and Company. For any requirement in question by Vendor, it shall be Vendor’s responsibility to obtain clarification from Company’s Representative, which shall be final and biding. Vendor shall obtain Company’s written authorization to deviate from the requirements of this Specification, the Purchase Order or Contract, and referenced standards.
2.6 Document Precedence
In the event of conflict between documents, the priority shall be as follows: a. Purchase Order or Contract b. This Specification c. Referenced Standards
However, conflicts shall be reviewed and resolved with Company’s Representative prior to initiation or continuation of the services to be performed in association with the Purchase Order or Contract.
3.0 STANDARDS
All pipe manufactured and/or supplied herein shall conform to the latest edition of the applicable industry codes, standards and recommended practices listed below.
American Petroleum Institute API Spec 5L Specification for
Line Pipe API RP 5L Recommended
Practice for Railroad Transportation of Line Pipe
API RP 5LW Recommended
Practice for Transportation of Line Pipe on Barges and Marine Vessels
American Society for Testing Materials ASTM A‐370 Standard Methods and Definitions for Mechanical Testing of Steel Products ASTM E‐18 Standard Test Methods for
Rockwell Hardness and Rockwell Superficial Hardness of Metallic Materials
ASTM E‐23 Standard Methods for
Notched Bar Impact Testing of Metallic Materials
Specification for Seamless Line Pipe 5 of 19
ASTM E‐92 Standard Test Method for Vickers Hardness of Metallic Materials
Tempering temperatures shall be 1200ºF ‐ 1300ºF.
ASTM E‐140 Standard Hardness
Conversion Tables for Metals
Vendor shall submit its proposed aim chemistry and range for the product and ladle analysis at tender submission for review. The proposed composition shall indicate the contents of all intentionally added alloying elements, residual elements, and total nitrogen content. Vendor shall advise Company whether any other elements are added that could affect weldability.
This specification is written in English
units. All pipe markings, certifications,
and material test reports shall be written
in English units.
4.0 MATERIALS AND MANUFACTURING
REQUIREMENTS In addition to the requirements of API 5L para 6.1.4, a product analysis shall be carried out on each heat or batch of 50 pipes (on at least 2 samples from either), whichever is the more frequent. A ladle analysis shall be carried out for each heat.
Pipe shall be manufactured in accordance with API Spec 5L for seamless quenched and tempered line pipe. Exceptions and/or additional requirements to API Spec 5L shall be as given in the following subsections.
The steel shall have a carbon equivalent (C.E.) greater than or equal to 0.35 and less than or equal to 0.43 as calculated from the product analysis, in accordance with the following formula:
Vendor shall submit a Detailed Manufacturing Procedure containing descriptions of the proposed steel making procedure(s), the proposed pipe making procedure(s), and the various testing and inspection procedures along with Vendor’s Bid.
Throughout the manufacturing process every reasonable effort shall be made to inhibit chemical segregation in the finished pipe. Any application of shape control additives, such as rare earth metals and calcium, shall be approved in writing by Company as to type and amount prior to use. The pipe material shall be fully aluminum‐killed steel manufactured with a fine‐grain practice.
4.1 Tensile Properties
In addition to the requirements of para 6.2.1 of API 5L, the maximum yield strength and UTS shall not exceed the specified minimum values by more than 14.5 Ksi (100N/mm²) and the yield strength to tensile strength ratio shall not exceed 0.89. A stress/strain curve for each test shall be retained and submitted as part of the as‐built documentation.
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Specification for Seamless Line Pipe 6 of 19
4.2 Elongation
Tests pieces of 8‐inches length shall have the following minimum elongations:
Maximum Longitudinal Elongation 25% Maximum Transverse Elongation 25%
4.3 Material Hardness
Vendor shall submit the expected range of pipe body hardnesses (minimum, average and maximum) with the Bid for review and approval by the Company prior to manufacturer of the line pipe. For seamless pipe material, a hardness survey shall be carried out on a macro‐section taken from one end of the selected pipes for production testing. The survey shall be carried out using a 10Kg load in accordance with BS 427: part 1 and shall consist of a complete traverse across the full thickness of the macrosection with indentations spaced at 2 mm to include indentations at both the internal and external surfaces (the survey ono the internal and external surface shall be carried out at 1.5mm from the edge). The maximum allowable hardnesses shall not exceed those given below. Pipe Location Max Hardness (Hv10) Non Sour Service Sour Service Internal Surface 250 230 External Surface 250 250 If any test fails then two retest pieces shall be cut from two other lengths in the same heat. If either of these two tests fail, the heat shall be rejected. However, the Vendor may test each individual piece from the heat and only the joints which meet the requirements shall be accepted.
4.4 Fracture Toughness Tests
Further to para 6.2.6 of API 5L, fracture toughness testing shall be carried out in accordance with SR5. The acceptance criteria for charpy testing shall be as detailed below, the test temperature for the charpy tests shall be ‐4°F (‐20°C). Value
Minimum Average 59 ft.lbs (80J) Minimum Individual 44 ft.lbs (60J)
Specification for Seamless Line Pipe 7 of 19
5.0 INSPECTION AND TESTING
Company reserves the right to witness all phases of the manufacturing and testing of steel line pipe at Vendor’s Works. Vendor shall afford the Company Representative all reasonable facilities, at no additional cost to Company, to insure that the pipe is manufactured in accordance with this Specification and with the Purchase Order or Contract. All inspections and tests shall be made prior to shipment from Vendor’s Works. All gauges, instruments, and equipment used in processing, measuring, and testing shall be periodically calibrated. Gauge blocks, micrometers, linear types, and diameter tapes shall have calibration traceable to the National institute of Standard Technology (NIST). Pressure gauges shall be calibrated using a dead weight tester of a calibrated master gauge which has accuracy traceable to known standards. Tensile testing machines shall be maintained and calibrated in accordance with ASTM Standard E4. Potentiometers and thermocouples shall be maintained and calibrated in accordance with ASTM Standard E220. Impact testing machines shall be calibrated in accordance with ASTM Standard E23. All mechanical testing shall be witnessed by Company personnel or their representative. Production testing shall be carried out at a frequency of one set of tests per 50 pipes with a minimum of one set per heat.
5.1 Manufacturing Procedure Qualification
For each pipe diameter and wall thickness, a material procedure qualification trial (MPQ) shall be carried out. From the first day of production, 10 pipe joints shall be selected by Company where one pipe joint shall be evaluated by
all mechanical tests and inspections required by this specification. Where production is to be split into more than one phase, Company reserves the right to request all production testing to be repeated. The following additional tests will also be required as part of the Manufacturing Procedure Qualification (MPQ): i) Fracture Toughness Testing
As part of the MPQ’s, a set of three charpy specimens shall be tested at the following test temperatures from one of the test rings to establish a transition curve, 20°C, 0°C, ‐20°C, ‐40°C, ‐60°C and ‐80°C (68, 32, ‐4, ‐40, ‐76, ‐112°F). Furthermore, a pipe sample shall be subjected to 5% longitudinal strain and then aged at a temperature of 250°C (482°F) for 1 hour. A set of three charpy specimens shall then be machined and tested in accordance with clause 6.2.6 of this specification. ii) Surface Condition Test
As part of the MPQ’s, the following test for surface condition shall be carried out on the first ten pipes of the first days production a) Preheat pipe surface to 70°C
(158°F) b) Grit blast each pipe to SA 2.5 c) Heat to 240°C (464°F) and cool in
air
Each pipe shall then be visually inspected. The surface condition of the pipes shall be such that upon production coating of a thin film system, the level of surface defects encountered would not cause a time delay during the coating operation. The total number of defects should be
Specification for Seamless Line Pipe 8 of 19
able to be removed in no longer than 3 man minutes per pipe. iii) Sour Service Condition Testing
Where pipeline service is defined as sour test coupons for step wise cracking test shall be cut. After exposure to the test, in accordance with NACE TM‐02‐84, using a test solution in accordance with TM‐01‐77, coupons shall be examined by ultrasonic testing to an approved procedure prior to sectioning. The reference reflector shall be a 2mm flat‐bottomed hole at mid thickness, and the area of any cracking exceeding this level shall not be more than 5% of the total surface area of the coupon. If no cracking is detected by this technique, sectioning shall not be required. If the reflection area is between zero and 5%, sections shall be taken through the strongest reflectors; the CSR value shall not exceed 2%.
5.2 Chemical Properties and Tests
In addition to the requirements of API 5L para 6.1.4, a product analysis shall be carried out on each heat or batch of 50 pipes (on at least 2 samples from either), whichever is the more frequent. A ladle analysis shall be carried out for each heat.
5.3 Physical Properties and Tests
Production testing shall be carried out at a frequency of one set of tests per 50 pipes with a minimum of one set per heat.
5.4 Hydrostatic Tests
Each pipe joint shall be tested to a test pressure which results in a hoop stress (based on a specified minimum wall thickness) equal to 95% of the SMYS. The
test hold period shall be a minimum of 10 seconds. All other requirements of API Spec 5L regarding hydrostatic testing of steel line pipe shall apply. All hydrostatic tests shall be recorded with a calibrated chart recorder. Under no circumstances shall distorted pipe be shipped to the Company. At the beginning of production and at least once during the production of this pipe, the Vendor shall remove the hydrostatic pressure gauge and verify calibration using a deadweight tester or a calibrated master gauge. Pressure gauges used in hydrostatic testing shall preferably have dials graduated over a range of about double the intended maximum test pressure but in no case shall the range be less than one and one‐half (1.5) nor more than three (3.0) times that pressure.
5.5 Dimensional and Acceptability Standards
All dimensions, weights, lengths, defects and end finishes shall be in accordance with API 5L except as modified hereunder (section numbers refer to applicable section in API 5L): Clause 7.2 Diameter Amendment: The inside diameter of the pipe end (for a distance of 100mm (4”) from the bevel) shall be checked at both ends by a rod gauge or similar type of Company‐approved instrument. The results of these checks shall be recorded for a frequency of 1 in 20 where the deviation from the nominal pipe I.D. shall be no more than +/‐2.0mm (0.08”) where measurements are taken in 2 planes at 90° to each other (the nominal I.D. shall be defined as the pipe O.D. minus 2 x the specified nominal wall thickness). Clause 7.3 Wall Thickness Amendment:
Specification for Seamless Line Pipe 9 of 19
The wall thickness measured at any point shall not vary from the specified nominal thickness by more than –8, +15%. The wall thickness shall be determined by ultrasonic testing. 7.5 Length Amendment: The pipe joint shall be supplied in lengths of 12.0m, 0.1m, +0.5m (39.4 ft, +0.3 ft, ‐1.6 ft). 7.7 Jointers Amendment: Jointers shall not be permitted. 7.8.12 Other Defects All pipe fitting in excess of 1.5mm (0.06”) depth shall be subject to remedial work. All pipe ends shall be cleaned free of excessive grease, oil and manufacturing debris.
5.6 Non‐Destructive Inspection
All NDE shall be performed on completion of heat treatment and hydrostatic testing.
The full length of each pipe shall be inspected in accordance with Supplementary Requirement SR4, Paragraph SR4.3, of API spec 5L, except that the inspection shall be designed to detect defects in both longitudinal and transverse directions. The reference standard shall be an external and internal API 10%, parallel‐sided, notch‐oriented both longitudinally and circumferentially. Ultrasonic equipment shall be calibrated at least twice per working shift. Due to the wall thickness requirement electromagnetic flux leakage equipment shall not be employed for final acceptance inspection of the product. A manual ultrasonic test shall be performed over a minimum of four inches on each end of the pipe to detect end area end defects and laminations. In addition, a magnetic particle inspection (bi‐directional) shall be
performed on both OD and ID surfaces of each end of each tube for a minimum distance of 4 ins (100mm). Details of the inspection procedures and ultrasonic thickness measurements including oblique notch capabilities shall be submitted to Company, as described in Section 9.2 of this Specification. All operators shall be qualified to SNT‐TC‐1A or equivalent. Operators shall be qualified to level 1 or 2 with supervisors qualified to level 3. Repair of defects by welding shall not be permitted.
5.7 Visual Inspection
All pipe shall be visually examined in a dedicated, well lit area. All pipe material shall have an external surface condition such that upon blasting to a finish of Sa2.5 by the coating contractor, a profile of 3‐5 mils (25‐125 microns) is achieved. All pipe internal surface shall be free of millscale and rust. Company, at its election, may inspect with its own forces or use an inspection service to inspect any or all phases of the manufacture of the pipe and the materials used in the manufacture of the pipe covered by these Specifications. Inspectors representing Company shall have free entry at all times to all parts of the Vendor’s Works that concern the manufacture of the pipe, covered by these Specifications. The inspector representing Company shall be given 5 days advance notice of the time at which the manufacture of said material is to be performed. The inspector representing Company shall observe Vendor’s existing safety requirements.
Specification for Seamless Line Pipe 10 of 19
5.8 Demagnetization
The residual magnetism in finished pipes shall be checked by measurement of the magnetic flux density at a location immediately adjacent to the pipe ends using a suitable Company‐approved probe or gauss meter. Checks shall be carried out on 3 pipes per shift in the as supplied condition with the maximum permissible level of magnetism being 20 Gauss. Vendor shall be responsible for ensuring that this maximum level is not exceeded in the “as delivered” condition (i.e., CSO nominated spoolbase, installation vessel or storage yard).
6.0 COATING
Pipe shall be shipped bare with no external or internal oils or varnishes applied (except over external paint stencils) and shall be free from loose mill scale, dirt, oil, grease or other extraneous material, both inside and outside, that might be determined to the satisfactory nondestructive inspection of the material at the Company’s inspection facility or application of an internal or external coating/insulation in a coating yard or in the field.
7.0 MARKING
No die stenciling (hot or cold) shall be permitted. All information required by API Spec 5L shall be paint‐stenciled on the surface of the pipe. The O.D. stencils shall be protected with a coat of clear lacquer. The markings shall include, but not be limited to, the following information:
Outside Diameter Process of Manufacturer Wall Thickness Company Purchase
Order Number Weight per Foot Grade of Pipe Test Pressure Heat Number and
Treatment Length of Pipe SR4 API Monogram SR5A‐SRB (Ft. Lbs.)‐0°F Weight of Pipe When Performed
If additional information is required to be paint‐stenciled on the surface of the pipe, this information will be summarized on the Purchase Order or Contract. Daily and summary tally sheets shall be maintained showing heat number, joint number, pipe joint weight per foot of length and length of each joint. Summary tally sheets shall list joint numbers consecutively. Pipe joint numbers for each diameter of pipe shall be consecutive. A colored paint band, minimum 50mm wide shall be applied on the internal surface of each pipe 100mm from the end. The color system employed shall be such that pipes of similar diameters, but differing wall thicknesses, are readily identifiable.
8.0 HANDLING, STORING AND SHIPPING
Vendor shall handle and properly care for all materials and pipe during all phases of manufacturing in such a manner as to minimize mechanical damage and corrosion. All handling shall be done with slings, padded hooks or unpadded hooks approved by Company. In no case shall brass lined hooks be used. Prior to loading, all rail cars, trucks, barges, ships or other conveyances shall
Specification for Seamless Line Pipe 11 of 19
be cleaned of debris or any substance that might damage the pipe. Suitable timber and other damage shall be used to protect the pipe against damage in transit. Loading onto or into rail cars, trucks, barges, ships or other conveyances shall be done in accordance with API RP 5L1 and API RP 5LW, where applicable, and in all cases in accordance with a procedure approved by Company. Finished pipe to be stored for a significant period of time at the mill shall be stored in a manner to prevent corrosion. Vendor shall provide and install bevel protectors and end closures of a type approved by Company. Vendor shall be responsible for repairs to pipe sections damaged during shipment to the point of delivery specified on the Purchase Order or Contract.
Specification for Seamless Line Pipe 12 of 19
9.0 CERTIFICATION, TRACEABILITY, AND DOCUMENTATION
All pipe shall be certified in accordance with the requirements of DIN 50.049 3.1b. Vendor shall provide a final documentation package in accordance with the requirements defined in the Purchase Order. Vendor shall submit a confirmed schedule for the manufacture of pipes along with the Vendor’s Bid. Such schedule shall contain dates for material procurement, fabrication, inspection, testing, and shipping. Vendor’s manufacturing schedule shall be firm for a period of 45 days after submittal of Vendor’s Bid.
Document Scheduled Submittal
a. Steel Making Procedure(s) With Bid
b. Pipe Making Procedure(s) With Bid
c. Inspection and Testing Procedures With Bid
d. Quality Control Procedures With Bid
e. Proposed Steel Composition With Bid
f. Ladle Analysis (for each heat of steel) *
g. Product Check Analysis
(for each heat of steel)
*
h. Results of Manufacturing Procedure Qualification
*
i. Certified Examination Reports *
j. Certified Physical Test Reports *
k. Storage Procedures With Bid
* When available during manufacture
Specification for Seamless Line Pipe 13 of 19
10.0 WARRANTY
It is agreed that Company may hydrostatically test all or portions of the line to be constructed with the pipe furnished on this order to a construction test pressure not exceeding 100 percent of the specified minimum yield strength based on nominal pipe dimensions. At Company’s election, injurious mill defects other then those resulting in failure under the line test, may be repaired as set out in the appropriate API Specification at Vendor’s expense. Any pipe that fails under line test as a result of laminations or other mill defects shall be replaced by the Vendor with the provision that construction and testing practices are followed as set forth in Title 49, Part 192 of the Code of Federal Regulations and latest revisions thereto. Total direct on‐set cost of such replacement, including cost for finding, cutting out and replacing the defective pipe, shall be borne by the
Vendor. The Vendor’s undertaking herein shall not be construed as an agreement to hold the Purchaser harmless against costs and expenses incurred by it as the result of damage to the pipe in transit or from damage sustained in its installation. Company may elect to raise and lower the field test pressure one or more time either as part of a planned testing routine or as a consequence of a failure in the pipeline or in the testing equipment. However, these pressure fluctations shall in no way relieve the manufacturers of their obligations herein. By the acceptance of the purchase order for the manufacture of pipe covered by these Specifications, the Vendor guaranteed and warrants that the pipe will be manufactured in accordance with the aforesaid API Specifications with such additional requirements as are contained in these Specifications.
Specification for Seamless Line Pipe 14 of 19
Appendix 1
INSTALLATION TESTS
Specification for Seamless Line Pipe 15 of 19
INSTALLATION TESTS
1. Weldability Trial
Vendor shall supply weldability data for
a product which is reflective linepipe in
terms of grade, dimensions, process
route, chemical composition and heat
treatment. Should this date be
unacceptable to Company, Vendor
shall carry out weldability trials under
Company instruction at Vendor'’ cost.
2. Reelability Data
Company shall supply reelability data
for a product which is reflective of the
project linepipe in terms of grade,
dimensions, process route, chemical
composition and heat treatment.
Should this date be unavailable or
unacceptable to Company, Vendor
shall carry out reelablity trials under
Company instruction at Vendor’s cost.
Specification for Seamless Line Pipe 16 of 19
Appendix 2
PIPE FOR STEEL CATENARY RISERS (S.C.R’s.)
Specification for Seamless Line Pipe 17 of 19
PIPE FOR STEEL CATENARY RISERS (S.C.R’s)
1. TEST FREQUENCY
All SCR pipe shall be tested on a
frequency of 1 in 25 pipes or 2 per
heat, whichever is less.
2. PIPE END TOLERANCES
a) Internal Diameter
The internal diameter of the
pipe end (for a distance of
150mm (6”) from the bevel)
shall be checked at both ends
by a rod gauge or similar type of
Company approved instrument.
The results of these checks shall
be recorded for every pipe.
The deviation from the nominal
pipe I.D. shall be no more than
+/‐ 1.0mm (0.04) where
measurements are taken in
planes at 120º to each other
(the nominal I.D. shall be
defined as the pipe O.D. minus
2 x the specified nominal wall
thickness).
Where matching is necessary to
achieve these end tolerances,
then the machined end shall
extend longitudinally 200m
back from each bevel and shall
not affect the specified wall
thickness tolerances. The
internal extremity of the
machining shall terminate in a
smooth, even one in four (1:4)
taper.
The finished machined surface
shall be 63RMS or better.
b) Outer Diameter
The deviation from the nominal
pipe O.D. shall be no more than
+/‐% of the nominal OD where
measurements are taken in 3
planes at 120º to each other.
These measurements shall be
taken at both ends and the
middle of each pipe.
c) cPipe End Eccentricity
The eccentricity of all pipe ends
with 150mm of the bevel shall
not exceed 10% of the nominal
wall thickness.
Specification for Seamless Line Pipe 18 of 19
3. CTOD TESTING
a) General
In order to obtain data for the base metal in the “as installed” condition the following
additional testing will be required:
Test Type: CTOD
Test Method: ASTM E 1290
Size: B x 2B
Orientation: L‐C (as defined in ASTM 616 Fig. A2.5)
Test Temperature: Minus 20ºC (minus 4ºF)
Test Frequency: One set of three tests from each of three
pipes per heat
Material Condition: Strain 5% and aged on hour at 250 ºC
The minimum CTOD shall equal or exceed 0.356mm (0.014 ins).
b) Heat Affected Zone
(Prequalification Test)
With regard to the girth weld
HAZ it is necessary to
demonstrate to Company that
the pipe is capable of being
welded by whatever process
required and that the CTOD
requirements defined in the
installation contract can be
attained.
Details of the welding
procedure and selection of
consumables shall be agreed
between Manufacturer and
Company prior to
commencement of the
qualification program.
The CTOD fracture toughness of
the resulting weld metal should
be measured at a location
approximately 0.039‐inch (1‐
mm) into the weld metal from
the mean fusion line on the
non‐beveled (square‐edge) side
of the weld groove and should
exceed the minimum required
CTOD for the HAZ at the test
temperature specified.
c) Test Method
CTOD specimen dimensions,
fatigue precracking, and testing
shall be in accordance with
ASTM E1290 except that:
• Fatigue‐precrack extension
as viewed on the external
Specification for Seamless Line Pipe 19 of 19
specimen surfaces at the
intersection between the
fatigue‐precrack tips and
the specimen width (W)
dimension surfaces shall not
be more than 0.079‐inch (2‐
mm).
• Machining of specimens
(with the exception of weld
reinforcement) shall be kept
to the minimum amount
necessary to achieve the
required tolerances on
specimen shape and size.
• CTOD specimens in the as‐
welded condition shall be
mechanically stress relieved
prior to fatigue precracking
using local‐compression
technique.
• A determination of σ, the value of CTOD near the
onset of slow‐stable crack
extension, is not required.
Either standard rectangular section
SE(B) or standard C(T) type full‐wall‐
thickness specimens may be utilized.
CTOD specimen orientation shall be L‐C
per Figure A2.5 of ASTM E616.
Test temperature shall be minus 20ºC.
CTOD testing and test results
evaluation shall be in accordance with
ASTM E1290. In the event of a pip‐in,
ASTM E1290, the results of sectioning
the specimen and examining the
microstructure along crack tip path,
and COMPANY acceptance of the
specimen examination results, shall
dictate the acceptance or rejection of
the pop‐in. If the pop‐in was rejected,
retest is not allowed.
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