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PETRONAS TECHNICAL STANDARDS
DESIGN AND ENGINEERING PRACTICE
TECHNICAL SPECIFICATION
WELDABLE MARTENSITIC STAINLESS STEELLINE PIPE FOR USE IN OIL AND GAS OPERATIONS(AMENDMENTS/SUPPLEMENTS TO API SPEC 5LC)
PTS 31.40.20.36
DECEMBER 2009
2010 PETROLIAM NASIONAL BERHAD (PETRONAS)All rights reserved. No part of this document may be reproduced, stored in a retrieval system or transmitted in any form or by any means (electronic,
mechanical, photocopying, recording or otherwise) without the permission of the copyright owner.
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Revision History
Rev No. Reviewed by Approved by Date
1 Noor Syamiza Abdul MalikSyahrizad Mohd Yunus
Abu Bakar Mohd Arif
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PREFACE
PETRONAS Technical Standards (PTS) publications reflect the views, at the time of
publication, of PETRONAS OPUs/Divisions.
They are based on the experience acquired during the involvement with the design,
construction, operation and maintenance of processing units and facilities. Where
appropriate they are based on, or reference is made to, national and international standards
and codes of practice.
The objective is to set the recommended standard for good technical practice to be applied
by PETRONAS' OPUs in oil and gas production facilities, refineries, gas processing plants,
chemical plants, marketing facilities or any other such facility, and thereby to achieve
maximum technical and economic benefit from standardisation.
The information set forth in these publications is provided to users for their consideration
and decision to implement. This is of particular importance where PTS may not cover every
requirement or diversity of condition at each locality. The system of PTS is expected to besufficiently flexible to allow individual operating units to adapt the information set forth in
PTS to their own environment and requirements.
When Contractors or Manufacturers/Suppliers use PTS they shall be solely responsible for
the quality of work and the attainment of the required design and engineering standards. In
particular, for those requirements not specifically covered, the Principal will expect them to
follow those design and engineering practices which will achieve the same level of integrity
as reflected in the PTS. If in doubt, the Contractor or Manufacturer/Supplier shall, without
detracting from his own responsibility, consult the Principal or its technical advisor.
The right to use PTS rests with three categories of users :
1) PETRONAS and its affiliates.
2) Other parties who are authorised to use PTS subject to appropriate contractual
arrangements.
3) Contractors/subcontractors and Manufacturers/Suppliers under a contract with
users referred to under 1) and 2) which requires that tenders for projects,
materials supplied or - generally - work performed on behalf of the said users
comply with the relevant standards.
Subject to any particular terms and conditions as may be set forth in specific agreements
with users, PETRONAS disclaims any liability of whatsoever nature for any damage (including
injury or death) suffered by any company or person whomsoever as a result of or inconnection with the use, application or implementation of any PTS, combination of PTS or
any part thereof. The benefit of this disclaimer shall inure in all respects to PETRONAS
and/or any company affiliated to PETRONAS that may issue PTS or require the use of PTS.
Without prejudice to any specific terms in respect of confidentiality under relevant
contractual arrangements, PTS shall not, without the prior written consent of PETRONAS, be
disclosed by users to any company or person whomsoever and the PTS shall be used
exclusively for the purpose they have been provided to the user. They shall be returned after
use, including any copies which shall only be made by users with the express prior written
consent of PETRONAS. The copyright of PTS vests in PETRONAS. Users shall arrange for PTS
to be held in safe custody and PETRONAS may at any time require information satisfactoryto PETRONAS in order to ascertain how users implement this requirement.
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TABLE OF CONTENTS
PART I INTRODUCTION
1.1 SCOPE
1.2 DISTRIBUTION, INTENDED USE AND REGULATORY CONSIDERATIONS
1.3 DEFINITIONS
1.4 ABBREVIATIONS
1.5 CROSS-REFERENCES
1.6 ITEMS TO BE SPECIFIED/AGREED BY THE PRINCIPAL
PART II AMENDMENTS/SUPPLEMENTS TO API SPEC 5LC
1. SCOPE
1.1 COVERAGE
1.2 METRIC UNITS
1.3 MEASURING DEVICES
1.4 SPECIAL PROCESSES
1.5 CERTIFICATION
1.6 QUALITY SYSTEM
2. REFERENCED STANDARDS
2.1 GENERAL
2.3 EQUIVALENT STANDARDS
3. DEFINITIONS AND TERMS
3.1 HEAT
3.4 INSPECTION LOT
3.5 INSPECTION LOT SIZE
4. MISCELLANEOUS - RETENTION OF RECORDS
5. PROCESS OF MANUFACTURE AND MATERIAL
5.1 PROCESS OF MANUFACTURE
5.2 COLD EXPANSION
5.3 HEAT TREATMENT
5.4 TRACEABILITY
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6. CHEMICAL PROPERTIES AND TESTS
6.1 COMPOSITION
6.2 HEAT ANALYSES
6.3 PRODUCT ANALYSES
6.6 CHEMICAL ANALYSES PROCEDURE
7. MECHANICAL PROPERTIES AND TESTS
7.1 MECHANICAL PROPERTIES
7.2 TENSILE TESTS - GENERAL
7.3 TENSILE TESTING
7.4 LONGITUDINAL TENSILE TESTS
7.5 TRANSVERSE TENSILE TESTS
7.6 WELD TENSILE TESTS
7.13 FLATTENING TESTS
7.15 GUIDED-BEND TEST
7.17 WELD DUCTILITY TEST FOR ELECTRIC-WELDED PIPE
7.19 CENTRIFUGALLY-CAST HOMOGENEITY TEST
7.20 HARDNESS TESTS
7.21 RETESTS (HARDNESS)
7.22 CHARPY IMPACT TESTING
7.23 CHARPY RETESTS
8. SPECIAL TESTS
8.1 CTOD TESTING
8.2 RESIDUAL MAGNETISM
9. HYDROSTATIC TESTS
9.1 INSPECTION HYDROSTATIC TEST
9.3 TEST PRESSURES
9.4 SUPPLEMENTARY HYDROSTATIC TESTS
10. DIMENSIONS, WEIGHTS, AND LENGTHS
10.1 DIMENSIONS AND WEIGHTS
10.2 DIAMETER
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10.3 WALL THICKNESS
10.5 LENGTH
10.7 JOINTERS
10.8 PIPE ENDS
11. NON-DESTRUCTIVE INSPECTION
11.1 INSPECTION METHODS FOR WELDED PIPE
11.2 INSPECTION METHODS FOR SEAMLESS PIPE
11.3 INSPECTION METHODS FOR CENTRIFUGALLY-CAST PIPE
11.4 RADIOLOGICAL INSPECTION EQUIPMENT
11.5 FLUOROSCOPIC OPERATOR QUALIFICATION
11.6 OPERATOR CERTIFICATION
11.7 REFERENCE STANDARD
11.8 ISO WIRE PENETRAMETER
11.9 FREQUENCY
11.10 PROCEDURE FOR EVALUATING IN-MOTION OPERATION OF THE FLUOROSCOPE
11.11 ACCEPTANCE LIMITS
11.12 IMPERFECTIONS
11.13 DEFECTS
11.14 WELD REPAIR
11.15 ULTRASONIC AND ELECTROMAGNETIC INSPECTION OF WELDED PIPE
11.16 ULTRASONIC AND ELECTROMAGNETIC INSPECTION OF SEAMLESS PIPE
11.17 ULTRASONIC INSPECTION OF CENTRIFUGALLY-CAST PIPE
11.18 TESTING OF BEVEL FACES
11.19 NDT PERSONNEL QUALIFICATION
12. WORKMANSHIP, VISUAL INSPECTION, AND REPAIR OF DEFECTS
12.2 PURCHASER INSPECTION
12.4 VISUAL INSPECTION
12.5 DEFECTS
12.6 REPAIR OF DEFECTS
12.7 PROCEDURE FOR REPAIR OF WELD SEAMS OF SUBMERGED-ARC WELDED PIPE
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12.8 PROCEDURE FOR REPAIR OF WELD SEAMS OF ELECTRIC-WELDED AND INDUCTION-
WELDED PIPE
12.9 PROCEDURE FOR REPAIR OF WELD SEAM OF GAS METAL-ARC WELDED PIPE
12.10 GAUGE PIG
13. MARKING AND SURFACE TREATMENT
13.1 MARKING - GENERAL
13.2 LOCATION OF MARKINGS
13.3 SEQUENCE OF MARKINGS
13.5 DIE STAMPING
13.6 SURFACE TREATMENT
14. STORAGE, HANDLING, AND PACKING
14.1 HANDLING
14.2 STORAGE
14.3 PACKAGING
14.4 TRANSPORTATION
15. DOCUMENTATION
15.1 LANGUAGE
15.2 PRE-MANUFACTURING DOCUMENTATION
15.3 SHIPPING DOCUMENTATION
16. FIRST-DAY-PRODUCTION TESTS
16.1 GENERAL
16.2 NON-DESTRUCTIVE TESTING
16.3 CHEMICAL COMPOSITION
16.4 MECHANICAL TESTING
16.5 SPECIAL TESTS
APPENDIX A REPAIR WELDING PROCEDURE
A.1 GENERAL
A.2 REPAIR WELDING PROCEDURE QUALIFICATION
APPENDIX F PURCHASER INSPECTION
PART III REFERENC
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PART I INTRODUCTION
1.1 SCOPE
This new PTS specifies requirements and gives recommendations for the purchase of
both seam-welded and seamless weldable martensitic stainless steel (known
generically as weldable 13Cr and weldable Super 13Cr) line pipe for use in oil and
gas operations. The requirements are considered necessary to maintain technical
integrity of pipelines and to ensure that a suitable specification exists in the absence
of standardised grades of these materials.
NOTE: This PTS applies under non-sour conditions. The PETRONAS definition of sour service is given in PTS
31.22.20.31, however, as the application limits of these materials have not yet been determined, qualification
testing in project-specific environments may be required even when the expected H2S is
insufficient to give a sour service definition.
Part II of this PTS gives amendments and supplements to API Spec 5LC Third EditionJuly 1998 (Reaffirm 2006) and shall be read and used in conjunction with that
document. The section numbering in Part II follows that of API Spec 5LC. Where
sections of API Spec 5LC are not amended or supplemented by this PTS, they shall
apply as written.
NOTE: Both API Spec 5LC and this PTS adopt sampling as a method to determine batch compliance.
Nevertheless, all pipes supplied shall meet all requirements of this PTS.
1.2 DISTRIBUTION, INTENDED USE AND REGULATORY CONSIDERATIONS
Unless otherwise authorised by PETRONAS, the distribution of this PTS is confined tocompanies forming part of the PETRONAS Group or managed by a Group company,
and to Contractors and Manufacturers/Suppliers nominated by them.
This PTS is intended to be used for the purchase of line pipe for the construction of
oil and gas production flowlines and related facilities.
If national and/or local regulations exist in which some of the requirements may be
more stringent than in this PTS, the Contractor shall determine by careful scrutiny
which of the requirements are the more stringent and which combination of
requirements will be acceptable as regards safety, environmental, economic and
legal aspects. In all cases the Contractor shall inform the Principal of any deviation
from the requirements of this PTS which is considered to be necessary in order to
comply with national and/or local regulations. The Principal may then negotiate with
the Authorities concerned with the object of obtaining agreement to follow this PTS
as closely as possible.
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1.3 DEFINITIONS
1.3.1 General definitions
The Contractor is the party, which carries out all or part of the design, engineering,
procurement, construction, commissioning or management of a project, or operation ormaintenance of a facility. The Principal may undertake all or part of the duties of the
Contractor.
The Manufacturer/Supplier is the party, which manufactures or supplies equipment and
services to perform the duties specified by the Contractor.
The Principalis the party, which initiates the project and ultimately pays for its design and
construction. The Principal will generally specify the technical requirements. The Principal
may also include an agent or consultant authorised to act for, and on behalf of, the Principal.
The word shall indicates a requirement.
The word shouldindicates a recommendation.
1.3.2 Specific definitions
Defect (in NDT) A discontinuity or group of discontinuities whose indication(s)
do not meet specified acceptance criteria.
Electric welded Term used in API 5LC, which shall be understood to mean HFW.
Imperfection (in NDT) An interruption, which may be either intentional or
unintentional, in the physical structure or configuration of a
pipe.
Indication (in NDT) Evidence of an imperfection that requires interpretation to
determine its significance.
Pipe end Complete pipe segment of 100 mm length measured from the
end face of the finished pipe.
Plate or strip The flat starting material for welded pipe before forming into
the shape of a pipe.
Purchaser Term used in API Spec 5LC, which has the same meaning as
Principal.
Qualified Manufacturer A Manufacturer whose product has been previously
demonstrated to be suitable for the intended service, and
formally accepted by the Principal.
Radiological Term used in API Spec 5LC which has the same meaning asradiographic. The term radiographic is used in this PTS.
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1.4 ABBREVIATIONS
CTOD -Crack Tip Opening Displacement
DN -Nominal Diameter
FL -Fusion Line
GTAW -Gas Tungsten Arc Welding
HAZ -Heat Affected Zone
HFW -High Frequency Welded
ID -Internal Diameter
KV -Charpy V-notch impact energy
LBW -Laser Beam Welded
MT -Magnetic particle testing
NDT -Non-destructive testing
OD -Outside Diameter
PAW -Plasma Arc Welded
PT -Liquid penetrant testing
RT -Radiographic Testing
SAW -Submerged Arc Welding
SMAW -Shielded Metal Arc Welding
UT -Ultrasonic Testing WCL -Weld Centreline
WPS -Welding Procedure Specification
1.5 CROSS-REFERENCES
Where cross-references to other parts of this PTS are made, the referenced section
is shown in brackets. Other documents referenced by this PTS are listed in (Part III).
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1.6 ITEMS TO BE SPECIFIED/AGREED BY THE PRINCIPAL
The following information should be provided by the Principal at the enquiry stage
of the order:
-Nominal ID (and whether constant ID is required);
-Minimum design temperature; -Maximum design temperature;
- Design pressure;
-Service environment (gas, oil, water, multiphase, sour, non-sour);
-End preparation required if different from the standard API bevel;
-Whether pipe is to be used as mother pipe for induction bends;
-Whether mechanical property restrictions for reeling are to be applied;
-Whether elevated temperature tensile testing is required and the acceptance
criteria;
-Requirement for mechanical tests in simulated post-weld heat-treated condition;
-Length requirements if different from (Part II - 10.5) of this PTS;
-Whether supply of jointers is acceptable and the welding requirements if different
from this PTS;
-Whether the passage of a gauge pig is necessary; -Which of the
Manufacturer/Suppliers quality control procedures are to be submitted for
agreement;
-Time period for submission of contract quality plan;
-Level of inspection to be deployed by the Principal;
-Whether inspection reports in accordance with ISO 10474 type 3.2 are required
instead of inspection certificates in accordance with ISO 10474 type 3.1.B;
-Specific marking requirements;
-Specific packaging requirements;
-Other specific requirements amending or supplementing this PTS.
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PART II AMENDMENTS/SUPPLEMENTS TO API SPEC 5LC
1. SCOPE
1.1 COVERAGE
Delete this section and replace with the following:
This specification covers the supply of proprietary grades of welded and seamless
martensitic stainless steel line pipe by qualified Manufacturers/Suppliers. The
primary product is bevelled pipe having a standard API bevel. Should a different end
finish be required, it shall be clearly stated by the Principal in the contract document.
Manufacturers/Suppliers should have satisfactorily qualified their products in
accordance with the upstream qualification requirements detailed in report SIEP 97-
5763. Alternative data may also be considered by the Principal for qualifying a
Manufacturer/Supplier.
1.2 METRIC UNITS
Replace first paragraph with the following:
Metric units are used throughout this specification.
1.3 MEASURING DEVICES
Delete this section and replace with the following:
The Manufacturer/Supplier shall control measuring devices within the requirements
of ISO 10012-1.
1.4 SPECIAL PROCESSES
Delete the part of the table pertaining to centrifugally-cast pipe. Delete reference to
repair welding procedures and add the following text:
Applicable special processes shall also include those identified and documented in
the quality assurance system of the Manufacturer/Supplier. Procedures for all special
processes shall be produced by the Manufacturer/Supplier and supplied to the
Principal (see Part IISection 15) when requested.
1.5 CERTIFICATION
Delete this section and replace with the following:
Inspection certificates in accordance with ISO 10474 type 3.1.B shall be supplied
unless the Principal specifies inspection reports in accordance with ISO 10474 type
3.2., in which case the Manufacturer/Supplier shall issue and validate the inspection
reports and they shall be counter-validated by the Principals authorised
representative. The Manufacturer/Supplier shall provide a listing of all pipes supplied
detailing for each pipe the unique pipe number, heat number, test number,
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certificate number, length and weight. These data shall also be supplied to the
Principal on a computer disc in an agreed format.
Add new section:
1.6 QUALITY SYSTEM
The Manufacturer/Supplier should maintain and operate a quality management
system in accordance with ISO 9001 or ISO 9002 or an alternative standard if
approved by the Principal.
The quality assurance system shall employ statistical process control and have
documented procedures for its application.
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2. REFERENCED STANDARDS
2.1 GENERAL
Add the following: See also (Part III) of this PTS.
2.3 EQUIVALENT STANDARDS
Delete this section.
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3. DEFINITIONS AND TERMS
3.1 HEAT
Add to the existing section:
Where the size of the secondary refining vessel is less than that of the primary steel
producing vessel, the heat shall be considered to be the metal produced by a single
cycle of the secondary refining vessel.
3.4 INSPECTION LOT
Delete this section and replace with the following: A unit of pipes from the same heat
and, for batch heat treatment, heat treatment batch,
having the same dimensions.
3.5 INSPECTION LOT SIZE
Delete this section and replace with the following: For pipes with OD < 508 mm, the
maximum lot size shall be 100 pipes. For other sizes, the maximum lot size shall be
50 pipes.
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4. MISCELLANEOUS - RETENTION OF RECORDS
Amend the second sentence of the first paragraph as follows:
Contract records, and any others requiring retention by the Manufacturer/Supplier's
quality assurance system, shall be retained by the Manufacturer/Supplier and shallbe made available to the Principal upon request for a period of five years after
completion of the order.
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5. PROCESS OF MANUFACTURE AND MATERIAL
PROCESS OF MANUFACTURE
Delete the first paragraph and replace with the following: Pipe furnished to this
specification shall be seamless or welded manufacture as defined below. Weldedpipe shall be welded using the processes described below. Combination welded pipe
shall be subject to the limitations given in item 6.
The manufacturing process shall be described in accordance with the requirements
of (15.2.2) and the material produced by the process shall have been prequalified in
accordance with SIEP 97-5763.
Plates or strip shall be formed into pipe at ambient temperature.
a. Seamless and Centrifugally-Cast.
1. Seamless is defined as wrought tubular product made without a welded seam. It is
manufactured by hot working steel or, if necessary, by subsequently cold finishing
the hot worked product.
b. Welded processes
1. Without filler metal
Place the existing text under a new sub-heading:
a. High Frequency Welding
The HFW process shall employ a minimum frequency of 150 kHz.
b. Laser beam welding
A welding process that produces coalescence with the heat from a laser beam
focussed on the joint. The beam provide a concentrate heat source for narrow , deep
welds and high welding rates.
NOTE Some Manufacturer/Suppliers may use HFW equipment to provide preheating for the laser welding
process.
2. With filler metal
Delete sub-section (b) relating to Gas Metal-Arc Welding.
c. Pipe making processes
2. Centrifugally cast
Delete this sub-section.
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4. Submerged-arc.
Submerged-arc welded pipe is defined as having one longitudinal seam produced by
the automatic submerged-arc welding process as defined in 5.1.b.2.a. At least one
pass shall be deposited on the inside and one pass on the outside. The full length of
the weld seam shall be made by the automatic submerged-arc process, using run-on
and run-off tabs.
6. Combination welding
Delete or double and add the following to this section: Only PAW/GTAW
combination welded joints are permitted by this specification.
7.0 Double seam
Double seam welded pipe is not permitted.
Add new sub-section 8. as follows:
8. Laser beam welding.
Laser beam welded pipe is defined as having one longitudinal seam produced by the
LBW process as defined in (5.1.b.1.b).
d. Tack welding
Add the following: Tack welding shall be continuous. Add new item as follows:.
e. Jointer weld
A jointer weld is a circumferential seam weld that joints two piece of pipes together
f. Strip end weld
A strip end weld is a weld that joins strip ends together thus permitting continuous
longitudinal welding of the strip. Strip end welds shall not be included in the final
pipe length.
Table 2
Delete this table.
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5.2 COLD EXPANSION
Delete this section and replace with the following:
Where appropriate, welded pipe shall be subjected to cold mechanical expansion.
Expansion shall be maintained between 0.8 % and 1.5 %.
The % expansion is defined as follows:
Da= OD (ID) after expansion
Db= OD (ID) before expansion
Sizing of seamless and welded pipe by cold reduction shall be limited to 1.5 %.
5.3 HEAT TREATMENT
Delete this section and replace with the following:
All pipe shall be supplied in the quenched and tempered condition.
The coiled strip and/or pipe shall be heat treated in accordance with the
Manufacturer/Supplier's documented heat treatment procedure. Pipe temperatures
shall be verified by recorded measurement and the measurements shall be included
in the quality records.
The coiling temperature shall be agreed between the Principal and the
Manufacturer. The tolerance on the tempering soaking temperature shall be 15 C.
5.4 TRACEABILITY
Add the following:
The Manufacturer/Supplier's procedure shall be documented and shall ensure that
any length of pipe can be traced to the correct heat/lot and the associated
inspection certificates. Each pipe shall be assigned a unique identification number,
which shall either be stamped at both ends with low stress die stamps or stencilled
onto the pipe as specified by the Principal.
NOTE: Attention is drawn to clause 4 of ISO 10474 regarding supply of certificates by an intermediary processor.
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6. CHEMICAL PROPERTIES AND TESTS
6.1 COMPOSITION
Delete this section and replace with the following:
The composition of the pipe determined by heat and product analysis shall be in
accordance with that specified by the Principal in the contract document. The
Principal shall specify a composition previously qualified by the
Manufacturer/Supplier in accordance with SIEP 97-5763. The primary elements,
which shall be determined, are:
C, Mn, P, S, Si, Ni, Cr, Mo, N, Cu, intentional additions.
6.2 HEAT ANALYSES
Delete first sentence and replace with the following:
The Manufacturer/Supplier shall furnish a certificate giving the heat analysis for
each heat of material applied to the order.
6.3 PRODUCT ANALYSES
Delete this section and replace with the following:
Product analyses shall be provided to the Principal in the inspection document. The
frequency shall be two pipes per heat. Samples shall be taken from formed pipe or
tensile tests specimens extracted from formed pipe.
In addition to the base metal chemical analyses, an analysis shall be performed on
the weld metal of pipe welded with filler metal. This test shall be performed on the
first-dayproduction test pipes and once every 100 pipes during production.
The composition shall comply with that specified by the Principal in the contract
document within the permissible variations in product analysis given in (Table 3).
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Table 3
Delete existing Table 3 and replace with the following:
Table 3. Permissible variations for product analysis of 13 % Cr line pipe
Element Permissible variation
C 0.01
Mn 0.04
Si 0.05
P 0.005
S 0.005
Cr 0.15
Ni 0.10
Mo 0.10
N 0.03
Other alloying elemens 0.02
6.6 CHEMICAL ANALYSES PROCEDURES
Methods of Analysis methods and practices relating to chemical analysis shall be
performed in accordance with ASTM A751, Standard Methods, Practices and
Definitions for Chemical Analysis of Steel Products .Calibrations performed shall be
traceable to established standards.
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7. MECHANICAL PROPERTIES AND TESTS
7.1 MECHANICAL PROPERTIES
Delete this section and replace with the following:
The pipe material shall conform to the following mechanical property requirements
at room temperature:
Tensile requirements
Yield
strength
(Rt0.5) range
Tensile strength
minimum
MPa
Elongation
minimum
%
Yield-to-tensile
ratio
maximum
550 - 700 700 20 0.90
NOTE: Rt0.5is the yield strength for 0.5 % total elongation.
7.2 TENSILE TESTS - GENERAL
Add the following:
Where guaranteed elevated-temperature properties are required, the Principal shall
state the test temperature and the property requirements in the contract
document. If post-weld heat treatment of field welds will be performed, additional
specimens shall be tested in the simulated post-weld heat-treated condition. Theacceptance criteria shall be as specified in (7.1). The Principal shall indicate whether
post-weld heat treatment is to be performed in the contract document. The
Manufacturer/Supplier shall advise the Principal of the correct post-weld heat-
treatment thermal cycle to maintain the required properties, including elevated-
temperature properties, of the pipe material.
7.3 TENSILE TESTING
a. Frequency
Delete this sub-section including Table 7, and replace with the following:
One transverse and one longitudinal tensile test from each first-day-production test
pipe and one pipe per lot shall be performed at room temperature.
In addition, if elevated-temperature testing is specified by the Principal, one
elevated-temperature transverse tensile test shall be performed on each first-day-
production test pipe and on one pipe per lot.
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7.4 LONGITUDINAL TENSILE TESTS
Delete this section and replace with the following:
Longitudinal tensile test specimens shall be either non-flattened strip or round bar.
7.5 TRANSVERSE TENSILE TESTS
Delete first paragraph and items a. and b. and replace with the following:
Transverse tensile properties shall be determined by flattened strip specimen.
Where pipe dimensions preclude the use of a strip specimen, round bar specimens
may be used with the agreement of the Principal.
7.6 WELD TENSILE TESTS
Delete "as specified in Table 7" from the first sentence.
Delete the second sentence and replace with the following:
All weld reinforcement shall be removed.
7.13 FLATTENING TESTS
Add the following to the second paragraph: The acceptance criterion for the second
stage flattening shall be no evidence of lamination or other imperfections.
7.15 GUIDED-BEND TEST
Amend the equation in Figure 5 as follows:
7.17 WELD DUCTILITY TEST FOR ELECTRIC-WELDED PIPE
Delete section from the start of the 4th sentence and replace as follows:
No cracks or breaks shall occur in the weld or parent material during flattening of
the test specimen to 50 % of its original OD. Liquid Penetrant or microscopic
examination shall be used to confirm the absence of cracking. Cracks which originate
from the edge of the specimen and which are less than 6 mm long shall not be cause
for rejection. The test frequency shall be once per lot of pipes.
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7.19 CENTRIFUGALLY-CAST HOMOGENEITY TEST
Delete this section.
7.20 HARDNESS TESTS
Delete this section and replace with the following:
7.20.1 Seamless pipe
A full circumferential section shall be taken as a sample from each first-day-
production test
pipe and from one pipe representing each lot. Hardness measurements shall be
performed in accordance with ISO6507-1 on three polished and etched specimens
taken at 120o
intervals around the circumference of the sample. Traverses shall be as
shown in Figure 6 of API Spec 5LC.
For pipe with wall thickness of 8 mm and greater, three hardness traverses shall be
made on each specimen: 2 mm from the outer surface; mid-thickness; and 2 mm
from the inner surface. Each traverse shall contain three readings spaced at 5 mm
intervals. The average of each of the three readings shall be the hardness value. For
pipe with wall thickness less than 8 mm only two traverses, each 2 mm from the
surfaces shall be required.
The acceptance criterion shall be a maximum hardness value of 325 HV10.
7.20.2 Longitudinally welded pipe
a. Macrographic examination
Two full thickness transverse samples shall be extracted from the longitudinal weld
from each first-day-production test pipe and from one pipe representing each lot.
Test pieces from the samples shall be polished and etched for macro-examination in
accordance with ASTM E 340. The examination shall be performed at a minimum
magnification of x5. The acceptance criterion shall be no defects as defined by this
PTS. Photomacrographs shall be included in the inspection documents.
b. Hardness testing
A series of Vickers HV10 hardness indentations shall be made in accordance with EN
1043-1 on one of the test pieces prepared for macro-examination from each of the
first-day-production test pipes and from one pipe representing each lot. The
hardness indentation locations shall be agreed by the Principal. The indentations
shall be visible in the photomacrographs.
For pipe with wall thickness of 8 mm or greater, three traverses shall be made, one 2
mm from the outer surface, the second across the centreline of the weld and the
third 2 mm from the inner surface. The centreline traverse may be omitted for pipe
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of wall thickness less than 8 mm. The indentations shall be visible in the
photomacrographs. No individual hardness value shall exceed the following:
Base material 325 HV10 Weld metal and HAZ 350 HV10.
Add new section:
7.21 RETESTS (HARDNESS)
Should a maximum of one hardness value per pipe exceed 325 HV10, a further three
indents shall be made in the proximity of the original indents so that there is no
interference between them. All three extra readings shall have a hardness value less
than 325 HV10. Should any of these extra readings exceed 325 HV10 then a further
test ring shall be cropped from the pipe for hardness testing and, in addition, two
further pipes from the heat shall be hardness-tested. Should any of these further
readings exceed 325 HV10, then the heat shall be rejected or all individual pipes
shall be tested for acceptance.
Add new section:
7.22 CHARPY IMPACT TESTING
One pipe per lot shall be subjected to Charpy impact testing in accordance with ISO
148-2. Both absorbed energy and percentage shear area shall be measured. The test
specimens may be extracted from the test rings taken for tensile and hardness
testing. If stress relieving of the pipe is required by the Principal, the tests shall also
be performed on pipe in the stress-relieved condition.
Tests shall be performed on specimens taken from the mid-thickness position at the
locations shown in the following table:
Pipe type Location
Base
meta
WCL FL FL+2 FL+5
Seamless X
SAW X X X X X
HFW (1) X X X
PAW &
GTAW
X X X X
LBW (1) X X X
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(1) For HFW and LBW pipe, the FL+2 tests may be replaced by tests taken from the WCL+2 position
A set of three specimens from each pipe shall be tested at the following test
temperature:
Nominal Pipe WallThickness t Test TemperatureoCMax TestTemperature
t < 16 T 0
16 < t < 25 T-10 0
25 < t < 32 T-20 0
t > 32 T-30 0
If T is not specified by the Principal in the contract document, the test temperature
shall be taken as 0 C.
The descending hierarchy of specimen size and orientation shall be as follows:
Choice Orientation Size mm1 Transverse 10 x 10
2 Transverse 10 x 7.5
3 Transverse 10 x 5
4 Longitudinal 10 x 10
5 Longitudinal 10 x 7.5
6 Longitudinal 10 x 5
Lower choice specimens shall only be used when the higher choice is impractical.
For pipe of wall thickness less than 5 mm, Charpy testing may be omitted.
The acceptance criteria for the different specimen sizes and orientations shall be as
follows:
Size
mm
Orientation Min. average
absorbed energyJ
Min. individual
absorbed energyJ
10 x 10 Transverse 60 45
10 x 7.5 Transverse 48 36
10 x 5 Transverse 33 25
10 x 10 Longitudinal 90 68
10 x 7.5 Longitudinal 72 54
10 x 5 Longitudinal 50 38
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The individual minimum shear area for base metal shall be 100 %. For weld metal
and HAZ specimens, the individual minimum shear area shall be 50 %.
Add new section:
7.23 CHARPY RETESTS
If tests fail to meet the specified requirements, the sampled pipe shall be rejected.
Two further pipes from the lot shall then be tested. If the results of both of these
further tests are satisfactory no further testing is required and the lot shall be
accepted. Should one or both pipes be unsatisfactory, the lot of pipes shall be
rejected.
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8. SPECIAL TESTS
Delete this section and replace with the following:
8.1 CTOD TESTING
If the pipe wall thickness exceeds 12.5 mm, CTOD testing shall be performed on the
three pipes selected for first-day-production tests. The test method shall be in
accordance with BS 7448 Parts 1 and 2. Rectangular Bx2B specimens shall be used
where B shall be as close to the full wall thickness as possible allowing for machining
requirements. The specimen orientation shall be NP. One set of three test pieces
shall be cut from each pipe with the notches placed at the weld centreline. A further
set of three specimens shall be cut with the notch placed in unaffected base
material.
If the pipe diameter prevents the extraction of 10 mm thick specimens, the
requirement for CTOD testing shall be waived.
The test temperature shall be T or 0 C whichever is lower. The acceptance criterion
shall be a minimum CTOD value of 0.15 mm.
8.2 RESIDUAL MAGNETISM
Three pipes per heat shall be tested for residual magnetism in their final delivery
condition. The maximum value of residual magnetism shall be 20 Gauss. Where the
residual magnetism of any sampled pipe exceeds 20 Gauss, the pipe shall be
subjected to degaussing operations and all remaining pipes from the heat shall thenbe checked and degaussed as necessary. The results of residual magnetism checks
shall be recorded and included as part of the inspection documentation.
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9. HYDROSTATIC TESTS
9.1 INSPECTION HYDROSTATIC TEST
Delete this section and replace with the following:
Each length of pipe shall withstand, without leakage, an inspection hydrostatic test
to at least the pressure specified in (9.3). The test pressure shall be held for a
minimum of 15 seconds for all pipes. For all pipes, hydrostatic testing shall take
place after sizing operations and final heat treatment. For welded pipe, hydrostatic
testing shall be performed before non-destructive testing.
The water used for hydrostatic testing shall have a maximum chloride ion
concentration of 50 ppm. The Manufacturer/Supplier shall include the details of
monitoring and control of hydrotest water in a documented hydrotest procedure.
9.3 TEST PRESSURES
Delete this section and replace with the following:
The test pressure for all sizes of pipe shall be such that the hoop stress calculated on
the basis of the minimum allowable wall thickness and including stresses from end
loading is at least 95 % of the specified minimum yield strength at room
temperature.
The Manufacturer/Supplier shall define the end load compensation factor in the
hydrotest procedure.
9.4 SUPPLEMENTARY HYDROSTATIC TESTS
Delete this section.
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10. DIMENSIONS, WEIGHTS, AND LENGTHS
10.1 DIMENSIONS AND WEIGHTS
Modify Note 2 as follows: The Manufacturer/Supplier shall state the plain-end
weight correction factor in the weighing procedure.
Add the following:
Dimensional and weight inspection shall be performed on pipes after all other
operations have been performed.
10.2 DIAMETER
Delete this section and replace with the following: The diameter of the pipe shall be
within the tolerances specified in Table 9 as amended below.
Table 9 TOLERANCES ON DIMENSIONS AND WEIGHTS
Outside Diameter D
Pipe body
Delete the existing text and replace with the following:
For welded pipe, the outside diameter of the pipe body, as determined by taping the
circumference, shall not deviate by more than 0.75 % or 3 mm, whichever is less,
from the value given in Metric Table C-1 in Appendix C. For seamless pipe, the OD
tolerance shall be 3 mm.
Pipe ends
Delete the existing text and replace with the following:
For welded pipe of diameter greater than DN 200 (8 inch), the average internal
diameter shall not deviate from the nominal internal diameter by more than 0.5 %
or 2.0 mm, whichever is less. For seamless pipe, the tolerance on average ID shall be
2.0 mm.
The nominal internal diameter is defined as the outside diameter D, given in Metric
Table C-1, minus twice the nominal wall thickness.
The internal diameter shall be measured using an internal gauge or a measuring
tape inside the pipe.
For pipe of DN 200 (8 inch) and below, the diameter tolerance may apply to the
outside diameter.
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Out-of-roundness
Delete the existing text and replace with the following:
The ends of each pipe shall be tested for out-of-roundness using an internal ring
gauge of diameter 4.0 mm less than the nominal internal diameter. The gauge shallpass freely into each end of the pipe for a distance of 100 mm when held normal to
the pipe axis.
Out-of-roundness of the pipe body shall be determined from measurement of the
maximum and minimum OD at the same pipe cross-section. The acceptance
criterion shall be:
ODmax- ODmin < 3 mm
Add the following to Table 9:
Local irregularity of seam welds
The pipe ends and three positions equidistant along the pipe length shall be checked
for non-circularity at the position of the longitudinal weld using a template gauge to
be agreed with the Principal. The chord length of the template shall be a minimum
of 25 % of the OD or ID as applicable, up to a maximum of 300 mm.
At the pipe ends, the gauge shall be located internally. The local irregularity in
profile shall not exceed 1.5 mm measured between the gauge and the pipe.
10.3 WALL THICKNESS
Delete the second sentence and replace with the following: The tolerance on the
nominal wall thickness shall be: Seamless pipe -10 % +15 % Welded pipe -5 % +10 %
10.5 LENGTH
Delete this section and Table 10 and replace with the following:
Onshore lines: 95 % of shipped pipes for the order shall be between 11 and 12.2 m
long.
No pipe shall be shorter than 8 m.
No pipe shall be longer than 12.5 m.
Offshore lines: The average length of shipped pipes for the order shall be 12.2 m.
95 % of shipped pipes shall be between 11.9 and 12.5 m long.
No pipe shall be shorter than 11.6 m.
No pipe shall be longer than 12.8 m.
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10.7 JOINTERS
Delete first two sentences and replace with the following: Jointers shall only be
supplied when specified by the Principal.
10.8 PIPE ENDS
Add to this section:
The pipe shall be supplied with pipe ends cut perpendicular to the pipe axis. The
maximum deviation from the perpendicular shall be 0.5 % of the nominal outside
diameter, with a maximum of 1.5 mm. The entire end bevel shall be machined and
root faces shall not be brought into tolerance by filing and/or grinding.
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11. NON-DESTRUCTIVE INSPECTION
11.1 INSPECTION METHODS FOR WELDED PIPE
Add the following to the first paragraph:
Non-destructive inspection for acceptance purposes shall be performed after
hydrostatic testing of the pipe.
Delete items a. and b. and replace with the following:
Welded pipe shall be inspected full length in accordance with the standards
nominated in (Table A). Where the system leaves untested portions at the pipe
ends, these portions shall be subjected to a manual or semi-automatic UT
examination based on the same technique, test sensitivity, and test parameters as
used for the main test. For manual scanning, the scan speed shall not exceed 100
mm/s.
For HFW and LBW pipe, the shear wave probe angle shall be 45 3 and the
number and arrangement of probes shall be in accordance with the following:
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Wall
thickness
range
mm
Number of probes for zone of weld
(at both sides of the longitudinal weld)
inner zone mid portion outer zone
11.9 one none One
12.0 to
17.9
one one pair in
tandem centered
at midwall position
One
18.0 to
23.9
one two pairs in
tandem centered
at 40 % and 60 %
of thickness
one
mode of
operation
pulse echo tandem pulse echo
reference
reflector
N10 notch 3.0 mm
flat bottom hole
N10 notch
For SAW pipe, the number and arrangement of probes shall be in accordance with the
following:
Wall
thickness
rangemm
Number of probes for zone of weld
(at both sides of the longitudinal weld)
inner zone mid portion outer zone
11.9 one none one
12.0 to
17.9
one one centered at
midwall position
one
18.0 to
23.9
one two centered at
40 % and 60 % of
thickness
one
24.0 to29.9
onethree centred at30 %, 50 %, and
70 % of thickness
mode of
operation
pulse echo pulse echo
(NOTE 1)
pulse echo
reference
reflector
N10 notch 3.0 mm flat
bottom hole
N10 notch
NOTE 1: The angle of the mid portion probes shall be perpendicular to the weld bevel with a tolerance of 3.
Where the weld bevel is less than 15 (half aperture), the probes shall be used in the tandem arrangement. For
these steep angles, the probe angle shall be 45 3. Probe angle requirements are also shown in the standardslisted in Table
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11.2 INSPECTION METHODS FOR SEAMLESS PIPE
Delete this section and replace with the following:
Seamless pipe shall be inspected full length in accordance with the standards
nominated in (Table A).
Where the system leaves untested portions at the pipe ends, these portions shall be
subjected to a manual or semi-automatic UT examination based on the same
technique, test sensitivity, and test parameters as used for the main test. For
manual scanning, the scan speed shall not exceed 100 mm/s.
11.3 INSPECTION METHODS FOR CENTRIFUGALLY-CAST PIPE
Delete this section.
11.4 RADIOLOGICAL INSPECTION EQUIPMENT
Delete this section and replace with the following:
Radiographic testing of welds shall be performed with X-ray equipment using fine-
grain type film and lead intensifying screens. The radiographic technique shall be in
accordance with ISO 12096. The image quality class shall be R1.
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11.5 FLUOROSCOPIC OPERATOR QUALIFICATION
Delete this section.
Table AStandards for non-destructive inspection
Non-destructive inspection Specification Cross-
reference
Notes
All pipe
Ultrasonic testing for laminar
imperfections at pipe ends
ISO 11496 (11.15)
Magnetic Particle or Liquid
Penetrant testing of bevel faces
ISO 13664 or
ISO 12095
(11.18)
Seamless pipe
Ultrasonic testing for longitudinal
imperfections
ISO 9303 (11.15) &
(11.16)
Ultrasonic testing for transverse
imperfections
ISO 9305 (11.15) &
(11.16)
Ultrasonic testing of wall thickness ISO 10543 (11.15) &
(11.16)
Ultrasonic testing for laminar
imperfections in the pipe body
ISO 10124 (11.15) &
(11.16)
Welded pipe (except HFW)
Ultrasonic testing for longitudinal and
transverse imperfections in the weld seam
ISO 9765 (11.15) 1.4
Ultrasonic testing for laminar
imperfections in the pipe body
ISO 12094 (11.15) 2.5
Ultrasonic testing for laminar
imperfections in the plate/strip
edges adjacent to the weld
ISO 13663 (11.15) 3.5
Testing of the weld seam at pipe ends
not covered by automatic testing: manual
UT or RT
ISO 9765 or ISO
12096
(11.15) or
(11.4) and
(11.11)
HFW pipe
Ultrasonic testing for longitudinal
imperfections in the weld seam
ISO 9303 or ISO
9764
(11.15)
Ultrasonic testing for laminar
imperfections in the pipe body
ISO 12094 (11.15) 2
Ultrasonic testing for laminar
imperfections in the plate/strip
edges adjacent to the weld
ISO 13663 (11.15) 3
Ultrasonic testing for longitudinal
imperfections in the pipe body
ISO 9303 (11.15)
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NOTES: 1. Full length RT of the weld seam in accordance with this PTS may be substituted.
2. The test may be performed on the plate/strip body prior to forming into pipe with a minimum
coverage of 25 %.
3. The test may be performed on the plate/strip edges in accordance with ISO 12094 prior to forminginto pipe.
4. Angle beam shear wave as follows: for longitudinal defect detection 50 to 70o
; for transverse defect
detection, X or K transmission, one pair of 50 to 70o
probes up to 11.9 mm thickness, two pairs of probes
for greater wall thickness. For on-bead scanning, the probe angle shall be 45 3o
.
5. Using a twin crystal probe with a focal length of between 25 % and 75 % of the thickness. The dead
zone shall be less than 25 % of the thickness at operational amplification.
11.6 OPERATOR CERTIFICATION
Delete this section.
11.7 REFERENCE STANDARD
Delete this section and replace with the following:
The reference standard shall be a wire penetrameter in accordance with ISO 1027.
11.8 ISO WIRE PENETRAMETER
Delete this section and replace with the following:
The penetrameter shall be selected in accordance with the requirements of ISO
12096
Table 1. Image class R1.
11.9 FREQUENCY
Delete this section.
11.10 PROCEDURE FOR EVALUATING IN-MOTION OPERATION OF THE FLUOROSCOPE
Delete this section.
11.11 ACCEPTANCE LIMITS
Delete this section and replace with the following:
Acceptance criteria shall be as specified in ISO 12096. The test report shall contain
the details specified in ISO 12096. If the Principal specifies that the radiographic test
procedure is to be agreed, items a to i of clause 9 of ISO 12096 may be stated in the
procedure and only items j to l included in the test report. Item k in the test report
shall include the actual sensitivity and density achieved.
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11.12 IMPERFECTIONS
Delete this section including Tables 12 and 13 and Figures 8 and 9.
11.13 DEFECTS
Delete this section.
11.14 WELD REPAIR
Delete this section and replace with the following: Any weld repairs shall be
performed in accordance with the requirements of section 12.6 and shall be
examined using the same technique used for examining the weld seam.
11.15 ULTRASONIC AND ELECTROMAGNETIC INSPECTION OF WELDED PIPE
a. Equipment
Add the following:
Automatic ultrasonic equipment shall incorporate:
i. A facility for registration and recording of indications on paper and/or on a
retrievable medium without intervention by the operator;
ii. An automatic weld tracking system for correct positioning of the probes with
respect to the weld centreline without operator intervention. To allow alternative
systems, the Manufacturer/Supplier shall demonstrate that complete coverage is
achieved even when the probe drifts away from the weld seam;
iii. A device which monitors the effectiveness of the coupling. A deviation in excess
of 10 dB from the acceptable coupling situation shall indicate a loss of coupling;
iv. An audible warning/paint spray system that operates when the coupling is
unsatisfactory;
v. An automatic paint-marking device that activates when the ultrasonic echo
received exceeds the trigger/ alarm level.
From each pipe under test, an automatic "on-line" record shall be made without
operator intervention. For every pipe, a summary record shall be made showing
pipe identification number, time, examination results (including re-examinations)
and effectiveness of acoustic coupling.
b. Reference standards
Delete this item, including Figure 10, and replace with the following:
Reference standards and calibration shall be as specified in the appropriate ISO
specification and this PTS. For automatic UT, calibration shall be performed using areference standard and shall also be checked dynamically.
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Specific requirements for each NDT standard shall be as follows:
ISO Standard Specific requirements
ISO 9764 N10 notch shall be on both internal and external
ISO 10124 Reference standard shall be a flat-bottomed
ISO 11496 Tested band shall be a minimum of 50 mm and
shall overlap automatic tested pipe body area by
a minimum of 25 mm. Reference standard shall be
ISO 12094 Minimum coverage shall be 25 %. Edge band
shall be 25 mm from final plate/strip edge.
Reference standard shall be a 6 mm flat-bottomed
ISO 13663 Reference standard shall be a flat-bottomed
c. Acceptance limits
Delete this item, including Table 14, and replace with the following:
ISO Standard Acceptance limit
ISO 9303 L2C
ISO 9764 L3
ISO 10124 ISO 3183-3, Table D.2, sour
ISO 11496 No trigger/alarm
ISO 12094 B1 (body). E1 (edge)
ISO 13663 ISO 3183-3, Table D.2
11.16 ULTRASONIC AND ELECTROMAGNETIC INSPECTION OF SEAMLESS PIPE
Delete this section and replace with the following:
a. Equipment
See (Part II11.15a).
b. Reference standards
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See (Part II11.15b) and the following:
ISO Standard Specific requirements
ISO 9305 Notch shall be on both internal and external
c. Acceptance limits
See (Part II - 11.15c) and the following:
ISO Standard Acceptance limit
ISO 9305 L2C
ISO 10543 As per ISO 10543
For ISO 9303 and ISO 9305, full coverage shall be achieved at the examination
sensitivity level and under all scanning speeds.
11.17 ULTRASONIC INSPECTION OF CENTRIFUGALLY-CAST PIPE
Delete this section.
Add new sections:
11.18 TESTING OF BEVEL FACES
Testing of bevel faces shall be performed using MT in accordance with ISO 13664.When agreed by the Principal, PT in accordance with ISO 12095 may be used. The
acceptance criterion shall be no linear indications
11.19 NDT PERSONNEL QUALIFICATION
NDT personnel shall be qualified and certificated in accordance with ISO 11484 or an
equivalent standard agreed by the Principal. The Manufacturer/Supplier's NDT
operations shall be managed by personnel certificated to NDT Level 3 (UT being the
main method). All NDT procedures shall show the approval and qualification
number/expiry date of the NDT Level 3.
Shift supervision and calibration activities shall be undertaken by personnel
certificated to NDT Level 2 or higher in all of the methods being used by the
Manufacturer/Supplier. All other personnel performing NDT operations shall be
certificated to NDT Level 1 in the relevant method(s).
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12. WORKMANSHIP, VISUAL INSPECTION, AND REPAIR OF DEFECTS
12.2 PURCHASER INSPECTION
Delete this section and replace as with the following:
The requirements of Appendix F shall apply.
12.3 WORKMANSHIP
a. Dents
Delete third sentence of this sub-section and replace with the following:
All cold-formed dents with a sharp bottom gouge and all sharp gouges (without
dents) deeper than 1.0 mm shall be considered as defects.
b. Offset of plate edges
Delete this sub-section and replace with the following:
The maximum permitted radial offset shall be as follows:
Wall thickness, t,
mm
Maximum radial offset
mm
HFW Other welding
processes
10 0.5 1.0
10 < t 20 0.05 t 0.1 t
>20 - 2.0
d. Height of outside and inside weld beads - except ERW
Delete tabulation after first paragraph and replace with the following: The bead
height shall not lie outside the ranges specified below: -Outside: - 0, + 3 mm -Inside:
- 0, + 2.5 mm The inside weld bead shall be ground flush with the parent material
over the full length of the pipe end.
e. Height of flash of electric-welded pipe
Delete second paragraph and replace with the following:
The inside flash of HFW pipe shall not extend beyond the prolongation of the
original inside surface by more than 0.5 mm plus 5 % of the nominal wall thickness.
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12.4 VISUAL INSPECTION
Delete this section and replace with the following:
The full internal and external surface of each finished pipe shall be visually examined
for surface defects. For internal examination of pipe DN 600 and larger, theinspector shall pass through the bore of the pipe. The Manufacturer/Supplier shall
control the visual inspection process with a documented procedure. The procedure
shall be qualified in accordance with ASME Section V - Article 9.
12.5 DEFECTS
b. Laminations and inclusions
Delete this sub-section and replace with the following:
The complete internal and external pipe surface and bevel faces shall be free ofsurface breaking laminations and inclusions.
Note : A lamination is defined as an internal metal separation creating layers
generally parallel to the surface
f. Disposition
1. Add the following to this item:
In all cases where repair by grinding has been carried out, the length of pipe
containing each grinding repair shall be re-inspected after the grinding operation bythe same inspection methods as the original inspection and by MT. The inspection
shall confirm freedom from defects and that the wall thickness is not less than the
minimum specified. Where manual ultrasonic testing for wall thickness is performed
it shall be in accordance with ASTM E 797.
2. Amend this item as follows: Repaired in accordance with 12.6.
3. Add the following to this item:
Where surface breaking defects are found in the pipe bevel, the pipe shall be cut
back and rebevelled. The new bevel shall be subjected to visual inspection and NDTin accordance with this PTS.
12.6 REPAIR OF DEFECTS
b. Weld seam of welded pipe
Delete this sub-section and replace with the following:
Defects in the weld seam of SAW pipe and pipe welded by GTAW or PAW using a
filler metal may be repaired. Repair of defects in the weld seam of other forms of
welded pipe shall not be permitted.
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Repair welding is not acceptable within 200 mm of the ends of the seam weld.
Repair welds shall be subjected to radiographic testing in accordance with (section
11).
No weld-repaired area shall be subjected to further repair.
c. Heat-treated pipe
Delete this sub-section and replace with the following: All repair welding (where
permitted) shall be performed prior to final pipe heat treatment.
Table 15
Delete this table.
12.7 PROCEDURE FOR REPAIR OF WELD SEAMS OF SUBMERGED-ARC WELDED PIPE
Delete this section and replace with the following: PROCEDURE FOR REPAIR OF ARC-
WELDED PIPE
The defect shall be completely removed and the cavity thoroughly cleaned. The
cavity shall be inspected by MT, or PT, to ensure that no remnants of the defect
remain.
The minimum length of the repair weld shall be 50 mm. The repair weld shall be
made by either SMAW or GTAW. The welding procedure shall be qualified in
accordance with Appendix A. Shielding gas containing hydrogen shall not be used.
12.8 PROCEDURE FOR REPAIR OF WELD SEAMS OF ELECTRIC-WELDED AND INDUCTION-
WELDED PIPE
Delete this section.
12.8 PROCEDURE FOR REPAIR OF WELD SEAM OF GAS METAL-ARC WELDED PIPE
Delete this section.
Add new section:
12.10 GAUGE PIG
If specified by the Principal, a gauge pig shall be passed through the following pipes
in their supply conditions:
i. All first-day-production test pipes.
ii. Two pipes from each working shift, one at the beginning and one at the end.
iii. First two pipes immediately after any adjustment or maintenance is carried out
on the mechanical expander.
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The gauge shall consist of two parallel, 6 mm thick circular plates each at least 98 %
of minimum pipe ID separated by a rigid bar of which the length is twice the pipe ID.
In order to pass the test, the gauge shall be passed through the pipe without
damaging the gauge plates. The material of the gauge plates shall be 316L or duplex
stainless steel or other material agreed by the Principal.
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13. MARKING AND SURFACE TREATMENT
13.1 MARKING - GENERAL
b.
Delete this sub-section and replace with the following: Marking of test pressure,
sizes and weights shall be in metric units. Add new sub-section:
c.
For pipes of DN 100 and above, stencil markings shall be block capitals of minimum
height 19 mm. For smaller pipe diameters, the character height shall be 10 mm or
more. The stencil colour shall be white and the stencil fluid shall be free from
chlorides.
13.2 LOCATION OF MARKINGS
b.
Delete this sub-section and replace with the following:
For pipe up to DN 400, paint stencilling shall be on the outer surface starting at a
point between 450 mm and 750 mm from the end of the pipe. For larger pipe, the
paint stencilling shall be on the inside surface, facing the pipe end, and finish 150
mm or more from the pipe end. In both cases the marking sequence shall be as
defined in (13.3).
c.
Delete this sub-section.
13.3 SEQUENCE OF MARKINGS
i. Supplementary requirements
Delete this sub-section.
Add the following new sub-sections:
PTS 31.40.20.36
Principal-specified markings
Additional marking requirements if specified by the Principal.
13.5 DIE STAMPING
Delete this section and replace with the following:
If specified by the Principal, the unique pipe identification number shall be die-
stamped or vibro-etched on the bevel face at each end of the pipe. Low stress die
stamps shall be used.
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13.6 SURFACE TREATMENT
Delete this section and replace with the following: The pipe shall be pickled or grit-
blasted in accordance with the Manufacturer/Supplier's documented procedure.
Add new section:
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14. STORAGE, HANDLING, AND PACKING
14.1 HANDLING
During manufacture, storage and transportation, the pipes shall not come into
contact with loose carbon steel (e.g. swarf, filings etc.). Nylon slings or rubber-coated hooks/supports etc. shall be used for all handling operations.
14.2 STORAGE
All pipe shall be stored and packed in accordance with the Manufacturer/Supplier's
documented procedure which shall show calculations for stacking height and
arrangement. The pipe shall be fitted with end caps and shall have a dedicated
storage area fully segregated from other materials.
14.3 PACKAGING
Packaging shall be as specified by, or agreed with the Principal.
14.4 TRANSPORTATION
The transportation of pipe shall be as specified in the following:
i. API RP 5LW for marine transportation
ii. API RP 5L1 for railroad transportation The pipe shall not be transported by sea as
deck cargo. Add new section:
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15. DOCUMENTATION
15.1 LANGUAGE
All documentation submissions required by this PTS shall be in the English language.
15.2 PRE-MANUFACTURING DOCUMENTATION
The Manufacturer/Supplier shall submit to the Principal within the time period
specified in the contract document, a contract-specific quality plan and procedures
detailing all special processes, as described in (Part II1.4).
NOTE: Review of this documentation at the enquiry stage of the contract may assist this process.
15.2.1 Content of the quality plan
The format and issue of the quality plan shall be consistent with the document
control element of the Manufacturer/Supplier's quality system.
The content of the quality plan should be based on ISO 10005 and shall include the
following:
1. Identification of the product and contract to which the plan is to be applied;
2. Reference to API Spec 5LC and this PTS;
3. Location of steel making and pipe production;
4. Identification of the individuals responsible for controlling the activities
defined in the plan;
5. Identification of the individuals with the authority to interface directly with
the Principal;
6. Identification of all subcontractors;
7. The quality plans of all subcontractors;
8. All sequenced activities for the contract and references to the quality
system procedures and work instructions which will be applied to these
activities;
9. Copies of all the quality system procedures and work instructions covering
manufacturing production, test and inspection, special processes, control ofnonconforming product, handling, storage, packing, and shipping as
requested by the Principal;
10. Test and inspection frequency and acceptance criteria including the upper
and lower process control limits where statistical process control is
employed;
NOTE: Process control for chemical composition and dimensional parameters is generally based on upper and
lower control levels.
11. The location of each inspection and test point in the process sequence;
12. Points where the Principal has established its witnessing or verification
requirements.
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15.2.2 Special processes
The Manufacturer/Supplier shall provide procedures for those manufacturing
activities determined to be special processes and critical to the final mechanical and
dimensional integrity of the pipe. This shall include the following:
Seamless pipe
-pipe forming procedure; -pipe heat treatment procedure; -hydrostatic test
procedure;
- NDT procedures
HFW pipe
-Strip manufacturing procedure including details of rolling and any specialised
cooling or coil heat treatment. -Strip NDT procedures.
-Pipe making method including details of methods for preparing the edges of the
strip for welding and for control of misalignment of edges and pipe shape. Details of
the sizing operation should also be given.
-A detailed welding procedure specification which shall include the following:
methods for automatic control of welding parameters;
electrical or induction frequency;
details of welding power unit;
welding speed;
welding temperature;
shielding method/arrangement;
weld profiling. -Weld seam (or full body) heat treatment procedure.
Hydrostatic test procedure.
NDT procedures.
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LBW pipe
-Strip and pipe manufacturing procedure as required above for HFW pipe.
-A detailed welding procedure specification in accordance with ISO 9956-11. This
shall include all details of the methods used for automatic control and monitoring ofthe welding parameters, gas shielding method/arrangement and weld profiling.
-Pipe heat treatment procedure.
-Hydrostatic test procedure.
- NDT procedures.
Arc welded pipe
-Strip and pipe manufacturing procedure as required above for HFW pipe.
-Plate rolling details for pipe to be supplied in the as-rolled condition.
-Heat treatment procedure for plate heat treated before forming.
-Pipe manufacturing procedure.
-For SAW, GTAW and PAW pipe, a detailed welding procedure specification in
accordance with ISO 9956-2.
-Hydrostatic test procedure.
- NDT procedures.
The manufacturing procedures shall correspond with those used previously for the
manufacturing qualification tests (in accordance with SIEP 97-5763).
15.3 SHIPPING DOCUMENTATION
Each shipment shall be accompanied by a packing list; a pipe tally list; and, where
applicable, an original or certified copy of the Principal's inspection release note. The
pipe tally list shall show the pipe numbers with their corresponding heat number,
length, weight, and end dimensions.
Add new section:
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16. FIRST-DAY-PRODUCTION TESTS
16.1 GENERAL
At the commencement of production, three completely finished pipes of the first
day's production shall be selected at random for testing to verify that the proposedmanufacturing procedure results in fully acceptable pipe.
If more than one cast is used or pipes of more than one dimension are produced
then the three pipes shall be taken from different heats or size range. For pipe made
from coiled strip, the test pipes shall include pipes taken from each end of the coil.
The Principal shall make the selection when a representative is deployed.
The selected pipes shall be considered to be the production test pipes per lot as
required in this PTS.
These tests shall be repeated upon any change in manufacturing procedure or
significant interruption to the production programme.
16.2 NON-DESTRUCTIVE TESTING
a. Visual examination
All test pipes shall be examined visually for dimensional tolerances, and for surface
defects, in accordance with (Part II10, 11 and 12) respectively.
b. Magnetic particle testing
For seamless pipe only, each test pipe shall be submitted to magnetic particle
testing over the entire pipe body in accordance with ISO 13665. For welded pipe,
the weld seam shall be submitted to magnetic particle testing along its entire length.
Acceptance of indications shall be in accordance with test category M1 of ISO 13665
with the exception that linear indications, other than acceptable undercut in welded
pipe, shall be considered as defects.
c. Ultrasonic testing
The body of each pipe used for first-day production tests shall be examined byultrasonic testing in accordance with (Part II11).
d. Radiographic testing
For welded pipe, except HFW, the entire weld seam shall be inspected in accordance
with (Part II11).
16.3 CHEMICAL COMPOSITION
The chemical composition of each test pipe and weld (if applicable) shall be
determined in accordance with (Part II6).
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16.4 MECHANICAL TESTING
Mechanical tests shall be carried out on each test pipe as required by (Part II7). In
addition, for each first-day-production test pipe, a full Charpy impact transition
curve shall be produced, showing impact energy in joules and percentage shear
(fibrous) of the fracture surface, plotted against temperature, over a temperature
range sufficient to produce fracture appearance from 10 % to 100 % fibrous shear.
16.5 SPECIAL TESTS
CTOD tests in accordance with (Part II - 8.1) and residual magnetism checks in
accordance with (Part II8.2) shall be performed on each test pipe.
APPENDIX A REPAIR WELDING PROCEDURE
A.1 GENERAL Delete sub-sections a., b., and c. and replace with the following:
Shielded metal-arc using low-hydrogen electrodes.
Gas tungsten-arc. Add the following: The composition of the repair weld metal shall
match that of the weld seam.
A.2 REPAIR WELDING PROCEDURE QUALIFICATION
Delete this section and replace with the following:
A repair welding procedure specification shall be prepared in accordance with ISO
9956-2. A fully simulated repair weld shall be made on a pipe piece of sufficient
length to accommodate extraction of all the required test specimens. Qualification
shall be by the visual, non-destructive, and destructive testing of the test weld seam
as specified in this PTS for the original seam weld.
Repair weld metal shall not be exposed on the inner surface of the pipe unless it has
been heat-treated.
A.2.2 Mechanical testing
Delete this section and replace with the following:
The repair welding procedure shall be subject to the same testing required for the
original weld by (Part II - 7 and 8).
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APPENDIX F PURCHASER INSPECTION
F.1 INSPECTION NOTICE
Delete this section and replace with the following: The Manufacturer/Supplier shall
give five working days' notice to the Principal of the production run or inspection or
test, which is to be witnessed. Add the following:
F.5 SUMMARY OF PRINCIPAL'S INSPECTION PROFILES
The Principal shall indicate the type of inspection to be performed in the contract
document.
SEQUENCE
NO
INSPECTION ACTION FULL
RUNNING
LIMITED
RUNNING
FULL
FINAL
LIMITED
FINAL
1.0 ATTENDANCE IN THE
MILL DURING
Yes Spot No No
2.0 CONTRACT QUALITY PLAN RA RA RA RA3.0* PRE-
MANUFACTURING
E * E * E *
4.0 MILL PRODUCTION
4.1 Pipe rolling SWA SWA
4.2 Heat treatment FW/RR FW/RR RR RR
4.3 Sampling test pieces E E
4.4 Physical properties FW/RC FW/RC RC RC
4.5 Hydrostatic test FW/RC FW/RC RC RC
4.6 NDT for acceptance FW/RR FW/RR RR/RC RR/RC
4.7 Dimensional inspection SW/SE/RR SW/SE/RR SE/RR SE/RR
4.8 Marking SW SW SW SW
4.9 Packing SW SW SW SW
5.0 DOCUMENT REVIEW
5.1 Production records RR RR RR RR
5.2 Tally lists RR RR RR RR
5.3 Inspection reports RC RC RC RC
5.4 Release note E E E E
6.0 FIRST DAY
PRODUCTION
W/RC W/RC RC RC
Abbreviations and notes:
E Execution by Principal's Inspector.
FW Witness first operation for compliance, including check of calibrations; subsequently random inspection, review document
and endorse for acceptance.
RA Review document and endorse for acceptance.
RC Review certificate and endorse for acceptance.
RR Review production records and endorse for acceptance.
SE Random execution by Principal's Inspector.
SW Random witness by Principal's Inspector.
SWA Random witness applicable when pipe forming is part of finishing line (e.g. there is no additional heat treatment on a
different line).
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W Full witness.
*If specified in the contract document.
PART III REFERENCES
In this PTS, reference is made to the following publications:
NOTE: Unless specifically designated by date, the latest edition of each publication shall be used, together with any
amendments, supplements, or revisions thereto.
PETRONAS STANDARDS
Index to PTS publications and standard specifications
PTS 00.00.05.05
Pressure vessels (amendments/supplements
PTS 31.22.20.31
ASME Section VIII, Division 1 and Division 2)
Qualification test requirements for weldable 13Cr line pipe
SIEP 97-5763, September 1997
AMERICAN STANDARDS
Specification for CRA line pipe API Spec 5LC, 3rd July 1998, Reaffirm Aug 2008
Recommended practice for railroad transportation of line pipe API RP 5L1
Recommended practice for transportation of line pipe on API RP 5LW
barges and marine vessels
Issued by: American Petroleum Institute
Publications and Distribution Section
1220 L Street, Northwest Washington, DC 20005
USA.
Boiler and pressure vessel code, Section V, ASME V
nondestructive examinationIssued by: American Society of Mechanical Engineers
345 East 47th Street New York NY 1001USA
Standard test mthod for macro-etching metals and alloys ASTM E 340
Standard practice for measuring thickness by manual ASTM E 797
ultrasonic pulse-echo contact method
Issued by: American Society for Testing and
Materials
100 Bar Harbor Drive, West Conshohocken, PA 19428-2959
USA
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BRITISH STANDARDS
Fracture mechanics toughness tests - Part 1. BS 7448 Part 1
Method for determination of KIC, critical CTOD
and critical J values of metallic materials
Fracture mechanics toughness tests - Part 2. BS 7448 Part 2
Method for determination of KIC, critical CTOD, and
critical J values of welds in metallic materials
Issued by: British Standards Institution
389 Chiswick High Road
London W4 4AL
UK
EUROPEAN STANDARDS
Destructive tests on welds in metallic materials. EN 1043-1
Hardness testingPart 1: Hardness tests on arcwelded joints
Issued by: Comit Europen de Normalisation
Rue de Stassart 35
1050 Brussels
Belgium
Copies can also be obtained from national standards organizations.
INTERNATIONAL STANDARDS
SteelCharpy impact test (V-notch) ISO 148
Radiographic image quality indicators for non ISO 1027
destructive testingprinciples and identification
Petroleum and natural gas industriesSteel pipe for ISO 3183-3
pipelinesTechnical delivery conditionsPart 3: Pipes of
requirement class C
Metallic materials - Vickers hardness test - Part 1: Test method ISO 6507-1
Quality systems - Model for quality assurance in design, ISO 9001
development, production, installation and servicing
Quality systems - Model for quality assurance in production, ISO 9002
installation and servicing
Seamless and welded (except submerged arc-welded) steel tubes 1SO 9303
for pressure purposes - Full peripheral ultrasonic testing for the
detection of longitudinal imperfections
Seamless steel tubes for pressure purposesFull peripheral ultrasonic 1SO 9305
testing for the detection of transverse imperfections
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Electric resistance and induction welded steel tubes for ISO 9764
pressure purposes - Ultrasonic testing of the weld seam
for the detection of longitudinal imperfections
Submerged arc-welded steel tubes for pressure purposesUltrasonic ISO 9765
testing of the weld seam for the detection of longitudinal and/or transverseimperfections
Specification and approval of welding procedures for metallic materials ISO 9956-2
Part 2: Welding procedure specification for arc welding, Amendment 1
Specification and approval of welding procedures for metallic
materialsPart 11: Welding procedure specification for laser beam welding ISO 9956-11
Quality management - Guidelines for quality plans ISO 10005
Quality assurance requirements for measuring equipment ISO 10021-1Part 1:Metrological confirmation system for measuring equipment
Seamless and welded (except submerged arc-welded) steel tubes for ISO 10124
pressure purposes Ultrasonic testing for the detection of laminar imperfections
Steel and steel productsInspection documents ISO 10474
Seamless and hot-stretch-reduced welded steel tubes for ISO 10543
pressure purposes - Full peripheral ultrasonic thickness testing
Steel tubes for pressure purposes - Qualification and certification of ISO 11484
non-destructive testing (NDT) personnel
Seamless and welded steel tubes for pressure purposesUltrasonic ISO 11496
testing of tube ends for the detection of laminar imperfections
Welded steel tubes for pressure purposes Ultrasonic testing for the ISO 12094
detection of laminar imperfections in strips/plates used in the manufacture
of welded tubes
Seamless and welded steel tubes for pressure purposes ISO 12095
Liquid penetrant testing
Submerged arc-welded steel tubes for pressure purposes ISO 12096
Radiographic testing of the weld seam for the detection of imperfections
Welded steel tubes for pressure purposes Ultrasonic testing of the area ISO 13663
adjacent to the weld seam for the detection of laminar imperfections
Seamless and welded steel tubes for pressure purposesMagnetic particle ISO 13664
inspection of the tube ends for the detection of laminar imperfections
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Seamless and welded steel tubes for pressure purposes ISO 13665
Magnetic particle inspection of the tube body for the detection of surface imperfections
Issued by:
International Organisation for Standardisation 1, rue de Varemb
CH-1211 Geneve 20Switzerland
Copies can also be obtained from national standards organizations