DOC. NO. KOC-MP-019 1 Page 1 of 19 1 REV.

1
I

KUWAIT OIL COMPANY (KmSmCm)

KOC STANDARD FOR

SUBMERGED-ARC WELDED
(SAW) PIPE TO API 5L
DOC NO: KOC-MP-019

ISSUING AUTHORITY :

STAKDARDS DIVISION
DOC. NO. KOC-MP-019
I Page 2 of 19 I REV. 1

KOCSTANDARDFOR

SUBMERGED-ARC WELDED. .
(SAW) PIPE TO API 5L

DOC NO : KOC-MP-019
 TABLE OF CONTENTS

PAGE

SCOPE 4

GENERAL I APPLICATION 4

TERMINOLOGY 4

REFERENCE CODES AND STANDARDS 5

ENVIRONMENTAL CONDITION 6

PROCESS OF MANUFACTURE & MATERIAL 7

CHEMICAL PROPERTIES 7

MECHANICAL PROPERTIES 8

HYDROSTATIC TESTS 9

DIMENSIONS, WEIGHTS, LENGTHS, ETC 9

DEFECTS AND REPAIRS 10

INSPECTION 10

QUALITY ASSURANCE 12

DOCUMENTATION 12

MANUFACTURING PROCEDURE QUALIFICATION 13

MARKING 14

STORAGE, HANDLING AND SHIPPING 14

DATA SHEET 1 ORDERING INFORMATION 15

APPENDIX A :
Line Pipe for Sour Service 17
1.0 SCOPE:

This Standard defines the minimum requirements for manufacture, testing,

marking, and purchasing of bare, bevelled end submerged-arc welded (SAW)
straight or spiral seam carbon steel line pipe to API Spec 5L required for KOC
pipelines and related facilities. Submerged-arc welded pipe shall be manufactured
in accordance with the requirements of the latest edition of API Spec 5L, as
supplemented by this Standard and the purchase order.

-
Appendix A details additional requirements for line pipe in "SOUR SERVICE or
SOUR ENVIRONMENT".

2.1 Carbon steel submerged-arc welded (SAW) Line Pipe can be used for all
oil/gas, submarine, onshore, offshore pipeline applications and other
facilities such as Gathering Centres, Booster Stations, and Tank Farm areas
for process and utilities service.

2.2 Submerged-arc welded pipe can be used in Sour Environment as defined

in NACE MR-0175, and in services with presence of CO,.

2.3 Pipes shall be procured from manufacturers who possess a valid license for
use of API Monogram and who are certified of meeting the requirements
of this standard.

2.4 This standard shall be used in totality when the quantity is large to make
a mill run of the pipe. The clauses of this standard shall be selectively
used for purchasing small quantities of out-of-stock line pipe.

3.0 TERMINOLOGY :

3.1 KOC : Kuwait Oil Company (K.S.C.)

3.2 HAZ : Heat Affected Zone

3.3 HIC : Hydrogen Induced Cracking

3.4 NDE : Non-Destructure Examination

3.5 NPS : Nominal Pipe Size (Diameter)

3.6 SSC : Sulphide stress cracking

 3.7 Sour Environments :

Sour environments are defined as fluids containing water as a liquid and

hydrogen sulphide exceeding the limits defined in clauses 3.7.1 and 3.7.2
and 3.7.3.

3.7.1 Sour Gas :

Materials shall be selected to be resistant to sulphide stress corrosion

(SSC) if the gas being handled is at a total pressure of 0.4 MPa (65 psia)
or greater and if the partial pressure of H2S in the gas is greater than
0.0003 MPa (0.05 psia). For further clarification, refer NACE MR0175 and
Appendix "A".

3.7.2 Sour Oil & Multiphase:

Materials shall be selected to be resistant to SSC if:

(i1 total system pressure exceeds 1.8 MPa (265 psia) and if partial
pressure of H2S is greater than 0.0003 MPa(0.05 psia), or

(ii) if partial pressure of HS

, exceeds 0.07 MPa (10 psia) in the gas
phase, or

(iii) if the HS
, content is greater than 15% in gas phase.
For further clarification, refer NACE MR0175 and Appendix "A".

3.7.3 mole% of HS
, x total system pressure
H2S Partial Pressure : =
100%

3.8 Submarine Application : Pipes which are submerged in sea water

and offshore pipeline construction.

4.0 REFERENCE CODES AND STANDARDS :

4.1 In the event of conflict between this specification and the codes
referenced herein, the most stringent requirement shall apply, unless
otherwise specified.

Any exceptions or deviations from this standard, along with their

merits & justification, shall be brought to the attention of KOC's
Controlling Department for their review, consideration and
amendment by Standard Division (if required).
DOC. NO. KOC-MP-019 I Page 6 of 19 1 REV. 1

4.2 List of applicable codes and standards (Latest Revision shall be

applicable):

API 5L Specification for Line Pipe

ASME B 31.3 Chemical Plant and Petroleum Refinery

Piping.

ASME B 31.4 Liquid Transportation System for

Hydrocarbons, LPG, Anhydrous Ammonia
and Alcohols

ASME B 31.8 Gas Transmission and Distribution Piping

System

ASME Sec IX Welding and Brazing Qualifications

ASTM A370 Test Methods and definitions for

Mechanical Testing of Steel Products.

ASTM A578 Specification for Ultrasonic Examination

of Plain & Clad Steel Plates for Special
Application.

ASTM E-92 Test Method for Vicker Hardness of

Metallic Materials.

NACE MR0175 Sulphide Stress Cracking Resistant

Metallic Materials For Oil Field Equipment

Test methods for evaluation of pipelines

steels for resistance to stepwise cracking
(NACE Standard).

Standard Test Method -Laboratory

Testing of Metals for Resistance to sulfide
stress cracking in H,S Environments.

5.0 ENVIRONMENTAL CONDITION :

5.1 The environment of Kuwait is severe, and pipes will be subjected to

sand and fine particle dust storms, sand laden winds, chemical
contaminants and extreme temperatures (-3OC t o + 55OC in shade).
The exposed black body metal temperature due t o solar radiation is
85OC.
PROCESS OF MANUFACTURE AND MATERIAL :

6.1 Pipe shall be made by the automatic fusion submerged-arc welding

(SAW) process with a minimum of one pass on the outside and a
minimum of one pass on the inside. Double seam pipe shall not be
acceptable. Cold expansion shall not exceed 1.5 percent of the pipe
circumference.

6.2 Pipe shall be manufactured from fully killed steel made to fine grain
practice. Continuous casting will be preferred compared with ingot
steels.

Both sides of the slab shall be hot scarfed. All surfaces of the slab
shall then be visually inspected for defects. After rolling, the slab
edges shall be sheared or machined to remove a width equal to at
least twice the plate thickness from each edge. Each plate shall then
be visually and ultrasonically examined to ensure freedom from
defects and unacceptable lamination or inclusion clusters. The
edges of the plate shall be machined to give the appropriate weld
bevels, and the plate then rolled into a tubular shape.

6.4 The surface to be welded shall be free from mill scale, or oil which
could interfere with the weld quality.

6.5 Jointer welds shall not be acceptable. Threaded coupling not

applicable.

CHEMICAL PROPERTIES :

The manufacturer shall furnish material test certificates and chemical

analysis report giving the heat analysis of each heat of steel used in the
manufacture of pipe. This report shall also list the pipe numbers of those
pipes made from each heat of steel for final certification and shipment.

The pipe manufacturer shall furnish the results of product analysis. The
analysis shall be carried out on the first coillstrip rolled from each heat.
Where more than 50 coilslstrips are rolled from -one heat, another full
product analysis shall be carried out every 50 coilslstrip. As a minimum,
product analysis shall be made on each pipe subject to tensile testing and
results shall be reported together on the mill certificate for co-relation.

The product Chemical Composition shall meet the following modified

requirements, in addition to API Spec. 5L.
 Element % Maximum
Carbon 0.16
Manganese Per API Spec 5L
Phosphorus 0.025
Sulfur 0.010
Silicon 0.35
Aluminium 0.05 .
Niobium +
Vanadium + Titanium 0.12 .

7.3 The product Carbon Equivalent (CE) for all grades shall be calculated using
the following formula and it shall not exceed 0.42% (max.).

Where: C = Carbon, Mn = Manganese, Cr = Chromium, Mo = Molybdenum, Ni = Nickel,

Cu = Copper, V = Vanadium

When the pipeline data sheet defines the service as sour, additional
limitations on the above equation shall be necessary. (See Appendix A)

8.0 MECHANICAL PROPERTIES :

Mechanical properties shall be as per API Spec 5L and as specified here under:

8.1 The maximum tensile strength shall not exceed the API Spec 5L Table 3
specified minimum tensile strength by more than 138 MPa (20,000 psi) for
grades X52 and higher. Maximum yield strength shall not exceed the API
Spec 5L Table 3 specified minimum yield strength by more than 103 MPa
(15,000 psi) for grades X52 and higher.

8.2 -
Cold Expansion Pipe furnished to this specification shall meet API Spec
5L (clause 6.2.1), unless otherwise specified.

8.3 Weld tensile tests shall apply regardless of diameter. Strip specimens shall
be used for longitudinal tests. Testing method as API Spec 5L.

8.4 Transverse tensile tests and longitudinal tensile tests, when specified shall
be carried out on the first pipe from each heat. Where more than 50 pipes
are made from one heat, another set of tests shall be carried out every 50
pipes. Both tests shall be mandatory for submarine service, and
requirements of Appendix A shall apply. Tensile testing procedure,
specimens and acceptance criteria as API Spec 5L.
8.5 Fracture Toughness Tests shall be required when so indicated in the Data
Sheet, and it shall be conducted in accordance with API-Spec 5L SR5B.
Perform Charpy Impact testing on the same pipe as subject to tensile
testing. Test frequency shall be based upon one test (three transverse
specimens) taken from one length of pipe from each lot of 100 lengths per
heat. Unless otherwise specified in the pipeline data sheet, the test
temperature shall be O°C (32OF), and minimum energy requirement shall
be 27 joules (2OFt-lbs). Fracture toughness testing is normally required for
gas lines, and submarine service. (See Appendix A)

8.6 -
Macrographic Examination A t the commencement of each production
shift, a section from one completed longitudinal weld for each welding line
shall be prepared for examination to check proper fusion of the joint and
the workmanship.

8.7 Hardness Test - a hardness survey shall be carried out on one pipe weld
per heat using a Vickers diamond pyramid hardness tester with a 10kg
load. Where a pipeline Data Sheet defines the service as sour, no
individual hardness value shall exceed 248 HV 10. For non-sour service,
this figure is relaxed to 300 HV 10. (See Appendix A)

HYDROSTATIC TESTS :

Mill Inspection Hydrostatic Test:

For all sizes and grades, each length of pipe shall be subjected to mill
hydrostatic test at a pressure not less than that calculated by the formula
(in Clause 9.4.3 of API 5L),with fiber stress as 90°h of specified minimum
yield strength. Alternate hydrostatic test pressure, if required shall be
specified in the Data Sheet.

For all sizes, hydrostatic test pressure shall be held for not less than 10
seconds.

Verification of Tests:

Each test record shall be marked with the number of the pipe to which it
refers. Any pipe which leaks or bursts during tests shall be retained for
thorough investigation in the presence of KOC's representativenhird Party
I

Inspector.

DIMENSIONS, WEIGHTS, LENGTHS AND END ANISHES :

10.1 Dimensions, weights, lengths, straightness, end finishes and tolerances

shall be as per API Spec 5L unless otherwise specified in Data Sheet.

10.2 All pipes shall be supplied in nominal lengths of 1 2 meters (double random
length) unless otherwise indicated in Data Sheet.
DOC. NO. KOC-MP-019 11 Paae 10 of 19 REV. 1

10.3 Total length supplied per item on an order shall not deviate from that
specified in the order beyond the tolerance of 1 % and -0%.

10.4 Jointers shall not be supplied.

DEFECTS AND REPAIRS:

11.1 Weld Repair procedure shall be qualified to ASME IX Code. Only low
hydrogen electrodes shall be used. The repair area shall be examined by
x-radiography, Ultrasonic and Magnetic particle methods. Multiple repairs
of the same location shall not be permitted. Other repair of defects per API
Spec 5L.

11.2 Dents and Cracks: Not Permitted.

11.3 Height of weld bead, offset of plate edges, and general workmanship as
API Spec 5L.

11.4 Lamination - detected on the weld bevel shall be a cause for re-bevelling.

11.5 Rejection - The production may be stopped at any stage of the order if
more than 10% of the pipes are rejected in any day's production.

INSPECTION :

12.1 Manufacturer shall furnish all test certificates as per SR-15 (Appendix F)
of API Spec 5L, and in relation to manufacturing procedure (Clause 13.0),
and tally sheets (pipe number list).

12.2 Third party inspection if required, shall be specified in the purchase order.
Following will be the scope of third partylpurchaser inspection surveillance,
but not necessary limited to:

Verify actual manufacturing procedure as approved by KOC.

Identify raw material against steel mill certificates.
Monitor scarfinglcropping of ingots.
Monitor edge preparation for welding.
Monitor weld macro sampling.
Verify reference standards for ultrasonic testing.
Witness calibration runs for NDE and verify their frequency.
Monitor NDE examinations and check records including Radiographs.
Surveillance of heat treatment operations.
Verify calibration of hydrostatic test recording equipment.
Monitor hydrostatic testing and review records.
Verify sampling of test specimens.
Witness mechanical tests.
Visual and dimensional checks of finished pipes.
Verify complete traceability from heat to finished pipe.
 D Check final markings.
Sign and stamp all reports.

12.3 Non-Destructive Inspection - Apart from the ultrasonic examination of the

plate, if specified in Data Sheet, all non-destructive inspection shall be
carried out after completion of manufacture and hydrostatic test.
However, this can be performed before bevelling and sizing of pipe. Means
shall be provided to mark the pipe when the ultrasonic inspection
equipment indicates an imperfection is present so that defective areas can
be identified.

12.4 Automatic on line ultrasonic inspection shall be carried out on the 100%
weld-line plus the HAZ. The manufacturer may elect to reject a pipe
outright on the basis of the automatic on-line examination or to guide the
weld and re-examine automatically without confirmation by manual
examination. Manual ultrasonic inspection shall be used to inspect the
length, at the end of each pipe, not covered by all automatic probes.
Ultrasonic equipment shall be provided with minimum of four shear wave
angle probes.

I The N5 notch shall be used for calibration of the ultrasonic equipment.

12.5 The full circumference of the pipe ends shall be ultrasonically inspected,
using compression wave for lamination, and using shear wave for other
defects, and cracks for a distance of at least 75mm (3 in). Lamination
exceeding 12mm (?A inch) in diameter or extending into the face of the
bevels and cracks of any detectable size shall not be acceptable.

12.6 Wet Magnetic Particle lnspection shall be carried out on the finished weld
bevels and on internal and external weld surfaces within 150mm (6 in) of
the pipe ends. Any imperfection detected in the weld bevels shall be cause
for rebevelling. When depth of all imperfections is greater than 12%% of
specified wall thickness, the imperfection shall be considered a defect.

12.7 Radiography Examination, if specified on the data sheet, shall be made

using X-ray and fine grained high contrast films per API Spec 5L.
Radiographic sensitivity shall be 2% or better. The following locations on
the pipe shall be radiographed.

8" of the weld at each pipe end

100% of the skelp end weld
All the Automatic Ultrasonic machine indications
All the weld stop and start locations
All spots showing weld missing
All repairs made to the weld
The adjacent sides of defective welds
Random spots may be selected'by the third party inspector.
12.8 Radiography films shall be interpreted by the manufacturer's level 11
inspector.

QUALITY ASSURANCE:

The manufacturer shall operate a quality system to ensure that the requirements
of this Standards are achieved.. The quality system shall be preferably based on
IS0 9000 series of standards and the manufacturer shall demonstrate compliance
by providing a copy of the accredited certificate on the manufacturer's quality
manual. Verification of the manufacturer's quality system is normally part of the
pre-qualification procedure, and is therefore not detailed in the core text of this
Standard.

DOCUMENTATION :

14.1 MANUFACTURING PROCEDURE SPECIFICATION:

The manufacturer shall submit a procedure, which shall include the

following:

Steel maker and plant at which steel is produced.

Steel making process.
Casting technique, slab soaking, holding and plate finish working
temperatures and control methods.
Method of heat treatment of plateslpipes.
Method of controlling the thickness of finished plate.
Nominal size of discard from plate edges and ends.
Plate ultrasonic testing techniques and acceptance criteria.
Plate edge preparation. (Weld joint design)
Method of forming pipe shape from plate.
Automatic welding procedure.
Repair welding procedure including weld defect removal and
examination.
Details of automatic ultrasonic testing equipment and calibration.
Details of manual ultrasonic testing equipment and acceptance
criteria.
Radiographic examination procedure including film type.
Procedure of mechanical testing including type of tests.
Metallographic examination procedure and hardness testing.
Techniques proposed for controlling pipe length, diameter, and wall
thickness. Methods and equipment for inspecting dimensions
(including tolerances) and bevel angle.
Hydrostatic Testing Procedure and methods of recording.
Pipe traceability of heat numbers and identification scheme.

The above requirements may be selectively waived at the discretion of KOC for
the manufacturer who has prior experience with the Company.
 14.2 A t least one copy of material certification, tally sheets, and release
documentation shall be dispatched with the pipes to facilitate goods
receiving inspection.

14.3 Final dossiers shall include the following, as applicable:

Manufacturing Procedure Specification

Manufacturing Procedure Qualification Records
Concessions
Original stamped or embossed, all reports as per clause 12.0 of this
Standard.
Tally sheets

14.4 Correspondences, drawings, instructions, data sheets, or any other written

information shall be in English language. All dimensions, units of
measurement, physical constants, etc. shall be in SI units, unless
otherwise specified.

15.0 MANUFACTURING PROCEDURE QUALIFICATION:

Manufacturing procedure qualification shall be carried out based on the procedure

submitted by the manufacturer and that approved by KOC. Test shall be
witnessed by KOC's representativenhird Party Inspector.

First length of pipe produced representing each nominal wall thickness, material
grade and steel source shall be examined and tested as per the mandatory
requirements of this Standard and API Spec 5L to include the following:

Chemical analysis
Tensile properties
Fracture toughness test
Metallographic examination
Hardness survey
Hydrostatic test
Visual inspection for surface defects and dimensional tolerances
Ultrasonic examinations

Reports shall be approved by KOC prior to commencement of regular production.

Procedure qualification shall be repeated upon any change in the manufacturing

procedure as deemed necessary by KOC representativelthird party inspector.

Appendix "A" details requirements for line pipe in "Sour Service or Sour
Environment". When pipeline Data Sheet defines the service as sour, the
manufacturing qualifications shall include the following mandatory tests:
15.1 Non-Destructive Testing:

i) X-radiography shall be made at 8" of the weld at each pipe end. In

addition, random selected locations of the weld shall be radiographed and
shall not be less than 20% of the pipe length.

ii) The machined pipe ends shall be examined with magnetic particle method
for laminations or gross defects.

iii) The first skelp end weld at each production station shall be fully
radiographed using x-rays. The parent metal around the skelp end weld
shall also be examined by ultrasonic for laminations.

15.2 A full pipe weldability trial shall be completed. The purpose of this test is
to ensure the pipe can be welded under field conditions at typical heat
input levels.

15.3 Qualification Test for Resistance to Hydrogen Induced cracking (HIC) per
NACE Standard (TM0284).

MARKING:

In addition to the marking specified in API Spec 5L, each pipe length shall be
marked with API Monogram. Marking shall be by paint stencilled only.
Manufacturer shall also ensure marking of pipe numbers on both ends to verify
pipe traceability with the reports and the requirements of API Spec 5L. The word
"Sour" shall be included in the pipe marking for sour service application, and
colour codes can be applied in the field, if required.

STORAGE, HANDLING AND SHIPPING:

All handling, and storage shall be done with care to avoid any mechanical damage
or corrosion to the pipe. Loading and shipping shall be as per API RP 5LW, unless
otherwise specified.
18.0 DATA SHEET 1 ORDERING INFORMATION

Specification API 5L SAW Grade

NPS in Quantity Meters Feet

Nominal Wall Thickness in mm Schedule

Nominal Length 0 12m Others (Specify) m

(Double random length)

End Finish 0 Plain Ends (Bevelled)

D Others (Specify)
Certificates of Tests and lnspection O Yes as per SR15 of API 5L 0 Others (specify)

Non-Destructive lnspection (SR-17) Yes No

0 Others (Specify)

Alternate Heat Treatment (specify)

Alternate Mill hydrostatic test required Yes 0 No

(If yes,specify)

Field hydrostatic test pressure KPa ~sig

Flow Medium Composition (Service)

Sour Environment O Yes No

Maximum Design Pressure kPa ~sig

Maximum Design Temp. O C Min. Design Temp. OC

Installation 0 Above ground 0 Underground 0 Submarine

Transverse Tensile Test & Longitudinal Tensile Test 0 Yes No
(For Submarine Application)

Third Party Inspection 0 Yes No

Coating & Protection 0 As per API 5L

Special Coating & Protection 0 Yes 0 No

(If yes, specify)

End Protection ;O Yes 0 No

(If yes, specify)

Marking 0 As per API 5L

Special Marking Yes No

(If yes, specify)

Additional Documentation 0 Yes No

(If yes, specify)

Additional Requirements 0 Yes D No

(if ves, s ~ e c i f v )
 DOC. NO. KOC-MP-019 1 REV. 1

DATA SHEET (Cont.)

KOC SUPPLEMENTARY REQUIREMENTS

For Sour Service

Hydrogen Induce Cracking (HIC)

Sensitivity Tests O Yes No

Sulfide Stress Cracking (SSC) Test O Yes No

Longitudinal Tensile Tests C] Yes No

Fracture Toughness (Charpy Impact) Tests 0 Yes No

i) Test Temperature: O C O F

ii) AVG. Impact Energy: Joule Ft-lbs

Ultrasonic lnspection of Plate (SAW) 0 Yes

Pipe End Lamination lnspection 0 Yes

Hardness Testing 0 Yes

Prevention of Delayed Hydrogen Cracking Yes

Compression Wave Scanning Test Yes

Magnetic Particle Test (Pipe Ends) U Yes

Other Tests (specify) : D Yes

Manufacturing Procedure Specification 0 Yes

(Reference Clause 13.1)

C- -
 APPENDIX "A"

LINE PIPE FOR SOUR SERVICE

SCOPE :

The following KOC supplementary requirements shall apply only when specified
on the purchase order Data Sheet. The supplementary requirements are, in
addition to the requirements stipulated in General specification, for extra testing
or inspection for SourISubmarine service.

MATERIAL AND CHEMICAL COMPOSITION :

A.2.1 Steel used for the manufacture of line pipe shall be of the fully killed type
made to fine grain low hydrogen practice. The steel shall have inclusion
morphology and microstructure which will be resistant to Hydrogen
Induced Cracking (HIC) with adequate toughness to assure self arrest of
an unstable crack.

A.2.2 The following limitations on Chemical Analysis shall be confirmed by the

manufacturer:

Element

Carbon 0.10
Manganese Per API Spec. 5L
Phosphorus 0.01 2
Sulfur 0.003
Silicon 0.35
Nickel 0.20
Chromium 0.10
Molybdenum 0.05
Copper 0.35
Aluminium 0.05
Calcium 0.005
Nitrogen 0.010
Niobium + Titanium + Vanadium 0.12

A.2.3 The product Carbon Equivalent (CE) shall be 0.38% maximum for all
grades using the formula in Clause 7.4.

MECHANICAL TESTS :

The tensile strength requirement shall be same as per clause 8.1.

A.4 KOC SUPPLEMENTARY REQUIREMENTS :
(Only when specified on Pipeline Data Sheet)

Hydrogen lnduced Cracking (HIC) Sensitivity Tests :

The sensitivity of the steel to Hydrogen lnduced Cracking upon exposure

to Hydrogen Sulphide saturated brine shall be determined using the test
methods as per NACE standard TM0284-87.

Sulfide Stress Cracking (SSC) Test:

Brittle failure by cracking under the combined action of tensile stress and
corrosion in the presence of water and HS , shall be per NACE Standard
TMOl77-90.

Longitudinal Tensile Tests :

For pipe sizes NPS 8 and larger, longitudinal base metal tensile tests shall
be required in addition to the transverse base metal tensile tests required
by API Spec. 5L. The properties shall be at least same in both longitudinal
and transverse directions. This test is mandatory for submarine service.

Fracture Toughness (CHARPY IMPACT) Tests :

Fracture toughness tests shall be conducted, regardless of pipe size,

according to API Spec. 5L SR5B. The test temperature and the average
value for impact energy absorbed shall be as shown in Pipeline Data Sheet
per specific project.

Three transverse specimens of weld metal, HAZ, and base metal shall be
cut for each test on a lot basis per API Spec, 5L SR5B.2.

Ultrasonic Inspection of Plate :

Plate or skelp shall be ultrasonically inspected for laminations. In no case

shall the inspection be less than ASTM A578 with level II acceptance
criteria.

Prevention of Delayed Hydrogen Cracking :

To prevent delayed hydrogen cracking of the weld seam on SAW pipe,

steps shall be taken to prevent flux from absorbing moisture and
maintaining humidity control in flux storage areas, baking of flux, and
keeping flux hoppers hot. For heavy wall (greater than 0.75 in.) and high
strength pipe greater than X52 the requirement is mandatory.
Hardness Testing :

7.1 A hardness survey shall be carried out on one pipe weld per
heat. Three cross-section samples shall be prepared
metallographically for Vickers hardness testing. No hardness
value shall exceed 248 HV10 for sour service. (Ref. ASTM
E-92).

Hardness traverses shall be made within l.Omm from the 1.D

and 0.D surfaces and at the mid-wall. Each traverse shall
consist of at least the following:
One indentation at the center of the weld area, one
indentation located not more than 1.Omm on each side of the
centeral indentation, and one indentation in the parent metal
outside of the normalized zone on each side of the weld.
(Total of 5 indentations in each traverse).

Magnetic Particle Test: (of pipe ends only)

The first six inches of the submerged-arc weld on each end of all
submerged-arc welded pipe shall be magnetic particle inspected on both
the 1.D and the 0.D per API Spec 5L.

Radiographic Test:

The homogeneity of weld seams shall be examined, and when specified on

the'Data Sheet, by radiological methods in accordance with API-Spec 5L,
clause 9.7.3.