Specification for Seamless Line Pipe - Engineering Experts · Pipe shall be manufactured in accordance with API Spec 5L for seamless quenched and tempered line pipe. Exceptions and/or

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


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.


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


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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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)


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


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:


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.


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


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.


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


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.


Appendix 1

INSTALLATION TESTS


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.


Appendix 2

PIPE FOR STEEL CATENARY RISERS (S.C.R’s.)


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.


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


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.

Documents

Specification for Seamless Line Pipe - Engineering Experts · Pipe shall be manufactured in accordance with API Spec 5L for seamless quenched and tempered line pipe. Exceptions and/or