Fusion Bonded Epoxy Coating Specification

Arthit Project GENERAL SPECIFICATION AGS-32
PIPELINE EXTERNAL FUSION BONDED Rev.0

EPOXY ANTI CORROSION COATING Page 2 of 26
Revision Description Date

0 Issue For Approval July’ 03
TABLE OF CONTENTS
SECTION PAGE
1.0 SCOPE 4
2.0 CODES AND STANDARDS 5
3.0 MATERIAL AND EQUIPMENT 6
4.0 C0ATING PROCEDURES 7
5.0 COATING OF LINEPIPE 8
6.0 INSPECTION AND TESTING 14
7.0 REPAIRS 18
8.0 DOCUMENTATION AND CERTIFICATION 19
9.0 SHIPPING AND HANDLING 19
10.0 PERFORMANCE 21
11.0 ACCEPTABLE FBE POWDERS 21
APPENDIX A HOT WATER SOAK TEST (24 HOURS) 22
APPENDIX B CATHODIC DISBONDMENT TEST (24 HOURS) 24
APPENDIX C TABLE 1, FREQUENCY OF COATING INSPECTION 26
1.0 SCOPE
This Specification shall govern the material, application, repairs in plant,

inspection, handling of bare and coated pipe, shipping and other requirements
for the application of a fusion bonded epoxy corrosion coating. This coating
shall be applied to the external surface of offshore pipelines with service
temperatures below 18°F (82°C). As used in this specification, the following
definitions shall apply:
Company PTT Exploration & Production Public Company Limited.
Contractor Party responsible for anti corrosion coating application.
Manufacturer Coating product manufacturer or supplier.
Contractor shall furnish all supervision, labor, materials, tools and equipment
and perform all operations necessary for the coating, handling, storing and
shipping of plant coated pipe as specified herein.
All work shall be performed to the satisfaction of Company and its authorized
on-site representative and in accordance with the requirements stated in this
specification or on the accompanying Request for Quotation or Purchase Order.
All work shall be performed in accordance with International Quality Standard

ISO 9002. Contractor shall establish and maintain such quality assurance and
inspection systems as are necessary to ensure the requirements of the
Specification are met. Contractor's quality plan shall be subject to Company
approval.
All costs incurred in producing coated linepipe shall be at Contractor's expense

unless specifically stated to be at Company's expense.
Contractor shall obtain Company's prior written approval for any deviations from
the requirements of the Specification, the standards referenced herein or on the
accompanying contract documents. In case of conflict between the
Specification and the accompanying contract documents, the contract
documents shall govern.
This document is not intended to be all inclusive, and the use of the guidelines
set forth does not relieve the Contractor of his responsibility to supply a product
capable of performing its intended service.
2.0 CODES AND STANDARDS
The latest issue of the following codes and standards shall be applicable.
2.1 National Association Of Corrosion Engineers

NACE RP-02 Recommended Practice for High Voltage Electrical

Inspection of Pipeline Coating Prior to Installation.
2.2 American Society Of Testing Materials
ASTM D4060 Abrasion Resistance of Organic Coatings by the

Taber Abrader
ASTM G-14 Test for Impact Resistance of Pipeline Coatings

(Falling Weight Test)
ASTM G-8 Test for Cathodic Disbonding of Pipeline Coatings
2.3 Swedish Standard Institute
SIS 05-5900 Pictorial Surface Preparation Standards for Painting

Steel Surfaces
2.4 Din
DIN 50049 Certificates on Material Testing
DIN 53153 Testing of Paints, Varnishes and Similar Coating

Materials
2.5 British Standards
BS 7079 Preparation of Steel Substrates Before Application of

Paint Related Products
BS 5493 Protective Coating of Iron and Steel Structures

Against Corrosion
2.6 International Standards
ISO 2808 Paints and Varnishes. Determination of Film

Thickness.
2.7 Company Specifications
AGS - 28 Steel Linepipe for Pipelines
3.0 MATERIAL AND EQUIPMENT

3.1 All material, equipment, tools and supplies furnished by Contractor must
be of good quality and adequate design, must be maintained in good
condition during use, and shall be subject to Company approval.
3.2 The plant used to clean, prepare and coat the pipe shall have covered
areas for storage of all materials, which when exposed to atmosphere,
are known to absorb moisture. Coating materials shall be handled and
stored in accordance with Manufacturer's specification or as directed by
an authorized representative of Manufacturer. Only new materials shall
be used. Stocks of material whose shelf life has expired shall not be
used.
3.3 The fusion bonded epoxy shall be one of those specified in Section 11.0.
3.4 Contractor shall supply all materials including:
• Epoxy Powder;
• Coating Repair Material (Valspar 46-F640, Or Company Approved

Equivalent);
• All Equipment For Handling, Cleaning And Coating Linepipe;
• All Test Equipment To Measure Or Inspect For Profile, Ph,

Temperature, Film Thickness, And Coating Holidays;
• All Instruments Or Standards For Calibrating Such Devices And All

Tools Necessary For Completing The Work.
6.10 Contractor shall obtain the following certified data from Manufacturer for
each batch of powder: (a batch being Manufacturer's shipping pack, as
covered by the certificates concerned).
• Sieve Analysis;
• Gel Time;
• Infra-Red Scan;
• Density;
• Moisture Content;
• Impact Resistance;
• Bendability.
Contractor shall also obtain from Manufacturer a film approximately 30

mils (750 microns) thick to test for dielectric breakdown voltage.
Specimen dimensions shall be 6 inches x 4 inches (152.4 mm x 101.6

mm).
3.6 Contractor shall obtain from Manufacturer a thermal (Differential

Scanning Calorimeter) analysis certificate for one batch of powder in
every five batches.
3.7 To confirm that the powder has been manufactured, handled, shipped,
and stored properly, Contractor shall perform a gel test on each batch
within one week of use. The gel time shall be as specified by
Manufacturer. Contractor shall submit details of his testing procedure to
Company for review and approval. As requested by Company,
Contractor shall also supply powder samples of each batch for
independent testing in the coating plant or by an outside laboratory.
3.8 Contractor shall carry out the following tests for one batch of powder in
every ten to verify material properties: gel time; moisture content; and
thermal analysis. If a batch of powder fails to meet Manufacturer's
certified properties, that batch shall be rejected and Company shall be
notified immediately.
3.9 Powder shall be stored in accordance with Manufacturer's

recommendations and shall be used according to Manufacturer's batch
sequence.
3.10 Each batch of powder should be used within 60 days of receipt from
Manufacturer. If a longer period elapses, Company may require that all
material properties listed in Section 3.5 for the powder batch be verified.
4.0 COATING PROCEDURES
6.10 Contractor shall submit a detailed written description of the coating

equipment, procedures, and materials for Company approval with the bid
documentation. The description shall be accompanied by full
details and results of tests on a similar coating or trials performed by

Contractor which document the quality of the finished coating. Such test
results and/or trials shall demonstrate, to the satisfaction of Company,
that Contractor's equipment, procedures, and materials can supply a
finished coating meeting the requirements of this Specification.
6.11 The procedures for coating shall include:
• Handling and storage;

• Cleaning;
• Coating application;
• Testing and inspection;

• Coating repair.
The equipment description shall cover all handling, cleaning, coating,

testing and inspection equipment to be used. Details of all materials to
be used for pipe coating shall be provided.
5.0 COATING OF LINEPIPE
5.1 Salt Testing
Prior to the coating of linepipe, Contractor shall verify that no salt(s) are
present on the surface of pipe joints to be coated. Contractor shall
perform a quantitative test for the presence of salt(s), or otherwise
demonstrate to the satisfaction of Company representative that no salts
are present through appropriate qualitative checks. One pipe per
shipment shall be tested. Additional tests may be required by Company
if problems occur during coating.
Contractor shall submit his salt-test procedures to Company for review

and approval.
5.2 Washing
5.2.1 Immediately prior to the initial blast cleaning, all oil and grease
deposits shall be removed by emulsion cleaner and washing.
Initial fresh water washing may be required to ensure removal
of soluble salts.
6.10.1 After washing and prior to blast cleaning, moisture shall be

removed by preheating pipe to between 40°C (104°F) and
85°C (185°F). The pipe shall then be maintained at a

temperature at least 3°C (6°F) above dew-point until after
coating.
5.3 End Caps
Suitable temporary caps shall be applied to both pipe ends by Contractor

in order to prevent abrasive from entering the pipe during blasting.
These end caps shall be removed prior to coating.
5.4 Blast Cleaning
5.4.1 External cleaning shall be performed by rotary blast cleaning.

5.4.2 After blast cleaning, pipe joints shall be thoroughly inspected

for surface defects such as raised slivers, laminations, or
hackles of steel visible on the surface. The defects shall be
removed by light grinding. Pipes with surface defects that
require extensive grinding shall be removed from the
production process for further investigation. Extensive grinding
shall not be performed without Company approval.
5.4.3 If grinding is approved by Company in order to remove

laminations or similar surface defects, the remaining wall
thickness shall be measured by Ultrasonic inspection following
grinding, and shall not be less than the specified minimum pipe
wall thickness. Ground areas shall merge smoothly with the
surrounding pipe surface. Requirements of Specification AGS-
28 shall also be met.
If pipe wall thickness is reduced by grinding below the specified

minimum pipe wall thickness, then that pipe joint shall not be
coated. Any such joint shall be clearly tagged as "rejected"
and shall be immediately reported to Company.
6.10.1 The blast cleaning media shall be dry, clean, and free from
contamination. Once established, a stabilized working mix of
blast cleaning media shall be maintained by frequent small
additions commensurate with consumption. Large additions of
new material shall be avoided. The working
mix shall be frequently checked (minimum once daily) and

continuously sieved to maintain it free of contamination. If
contaminated by oil or grease, the mix shall be completely
replaced.
5.4.5 The cleaning media shall be metallic shot for the first blast
cleaning unit and metallic grit for the second blast cleaning
unit. The cleaning media shall be as specified in BS 7079.
5.4.6 The exterior pipe surface shall be finally cleaned to Swedish

Standard SIS 05 5900, Sa 2.5. The standard shall be
interpreted to mean that metal surfaces shall be blast cleaned
to completely remove all dirt, mill scale, rust, corrosion
products, oxide, paint, and other foreign matter from the steel
surface. The surface shall have a uniform gray appearance.
5.4.7 Any part of the pipe exterior corroded in storage to the extent
of rust grade D of Swedish Standard SIS 05 5900 shall be
tested after blast cleaning for the presence of soluble iron
corrosion products by the method detailed in Appendix G of BS

5493, or to an alternate standard approved by Company. If
soluble iron corrosion products are detected in corrosion pits,
the pipe shall be recleaned until the results are negative.
5.4.8 The abrasive cleaning media of the final blast cleaning unit
shall be selected to achieve a surface profile of a minimum of 2
mils (50 microns) and a maximum of 4 mils (100 microns),
unless other values are recommended by the powder
Manufacturer. The method of measurement shall be Testex
replica tape, and the tapes shall be retained for the record.
The measurement shall be carried out on a minimum of one in
twenty pipes.
5.4.9 Contractor shall have full responsibility for the decision to:
release pipe for coating; return pipe for recleaning; or reject
pipe for excessive surface imperfections.
5.4.10 The blast cleaned surface shall be vacuum cleaned of dust or
other loose contaminants. Coating shall take place before
there is any visible deterioration in the cleanliness of the
surface and within 4 hours of blast cleaning.
5.4.11 Surface conditioning procedures (e.g. phosphating) proposed

by Contractor after blast cleaning shall be approved by
Company prior to start of coating.
5.4.12 Any defect that, in the opinion of Contractor, appears to be too

extensive to carry out remedial treatment shall be noted,
recorded, and the area of the pipe marked "Suspect Steel".
The marking shall be made on the outside of the pipe using
chalk only; oil or paint based markers shall not be used. The
pipe shall be moved to a quarantine area for further inspection
or treatment.
5.5 Surface Conditioning
5.5.1 After the first blast cleaning unit, when the appropriate surface
cleanliness has been achieved, the pipe shall be treated as
follows:
1) A solution of 1 part Oakite 33 (or Company approved

equivalent) to 9 parts clean water shall be applied by spray
or gravity feed at the rate of 4 litres (1 gallon) (10% Oakite
33) per each 10 square metres (100 square feet) of pipe
surface. Solution shall be agitated as required to prevent
settling of the mix.
2) A uniform pH of 1 or less shall be maintained over the

entire surface of the treated area as checked with pH
paper.
3) Treatment shall be for a minimum of 20 seconds with the

pipe surface temperature between 45°C (110°F) and 65°C
(150°F). With approval of Company, treatment time can be
extended at the rate of 2 seconds for each degree below
45°C (110°F).
4) A thorough clean, high pressure water rinse with minimum

of 35 to 70 bar (500 to 1000 psi) tip pressure shall follow to
remove any treatment residue. To minimize oxidation (flash
rust), the rinse water shall be treated with Oakite NC rinse
at a concentration rate of 200 milliliters per 100 liters of
water (0.2% by volume).
5) The wash solution and rinse will result in a weak

concentration of approximately 1.5% or less phosphoric
acid. It shall be the responsibility of Contractor to properly
handle and dispose of this waste, including neutralising if
required, in a manner recommended by Manufacturer.
5.5.2 After the second and final blast cleaning unit, Manufacturer
shall verify that the surface cleanliness requirements of SA 2.5
have been achieved. The pipe shall then be treated with
Accomet PC or a Company approved alternative.
5.5.3 Contractor shall submit Accomet PC application procedure for

Company review and approval.
5.6 Preheating
5.6.1 Residues of abrasive, dirt, etc. shall be removed from the pipe
interior before entering the coating booth.
5.6.2 Pipe shall be preheated over its entire length to the

temperature specified by the epoxy powder Manufacturer. If
the pipe is wholly or partially overheated, it shall be cooled to
ambient temperature and reheated. The heat source shall not
leave a residue or contaminant on the pipe surface.
Thermocouples or another approved method shall be used to
measure the temperature to the satisfaction of Company.
Oxidation of the steel prior to coating in the form of 'blueing' or

other apparent oxide formation is not acceptable. If oxidation
occurs, the pipe shall be cooled to ambient temperature and
recleaned.
5.6.3 If rubber smears or other similar contamination occurs on the

cleaned pipe (e.g. faulty operation of the conveyor), the pipe
shall be recleaned at Contractor's expense.
5.7 Application Of Coating
6.10.1 Epoxy powder shall be applied to the pipe to form a smooth,

even coating with a nominal dry film thickness of 30 mils (750
microns). The thickness shall be not less than 28 mils (700
microns) and not greater than 33.5 mils (850 microns), unless
a thinner coating is specified in the
coating purchase order. Note: Pipe joints that will not be

concrete coated and will not be exposed to operating
temperatures above 150°F (65°C) may be coated to a
thickness of not less than 14 mils (350 µm), and not more than
16 mils (400 µm) at Company discretion.
5.7.2 Pipe ends shall be protected from powder coating during the
process by a method approved by Company.
5.7.3 For pipe joints that will not be concrete coated, the FBE
coating shall be applied to within 3 inches ± ½ inch (76.2 mm +
12.7 mm) of the pipe ends. For pipe joints that will be concrete
coated, the FBE coating shall be applied to within 9 inches ± ½
inch (228.6 mm + 12.7 mm) of the pipe ends.
5.7.4 At the beginning of each working shift, or at a greater

frequency if necessary, the coating booth shall be inspected to
ensure that there is no accumulation of powder within the
coating hood.
5.7.5 Recycled powder may be reused if it is: contaminant free;

properly re-processed through magnetic separators and
screens no coarser than 7 mils (177 microns) (80 mesh U.S.
sieve size); mixed with the new powder such that a mixture
contains no greater than 20% of reclaimed powder; and fully
warranted by Contractor and the powder Manufacturer.
5.7.6 After application the coating shall be cooled to below 120°C

(248°F). The time between coating and cooling to this
temperature shall be recorded accurately and shall be within

the limits specified by the powder Manufacturer.
5.7.7 In the periods between coating and cooling, the pipe shall be
handled so as to avoid damage to the coating.
5.7.8 Care shall be taken to ensure that devices used to seal or

connect the pipes do not carry contamination, such as uncured
powder or water, back onto uncoated pipe.
6.10.1 Immediately after a full cure has been accomplished, the

identification marks shall be reapplied to the coated pipe
using a method approved by Company and compatible with

the coating. Additional identification shall be made in order to
monitor the coating and test batches.
5.7.10 Company will inform Contractor of storage requirements, if

any. If coated pipe joints are designated for long-term storage,
precautions shall be taken to prevent corrosion to pipe ends
and interiors.
6.0 INSPECTION AND TESTING
6.1 General
6.1.1 Contractor shall demonstrate to the satisfaction of Company

that Contractor's equipment, procedures, and materials will
supply a finished coating meeting the requirements of this
Specification by successfully performing prequalification tests
as detailed in Table 1, Appendix C. These tests shall be
repeated on the first day of production and thereafter at the
frequencies shown in Table 1. Should any test fail, Company
and Contractor shall jointly investigate to determine the cause
and extent of failure. Destructive test requirements shall be in
accordance with Section 6.11.
6.2 Visual Inspection
6.2.1 Coated pipe shall be visually inspected for surface blemishes

or other abnormalities. The coating shall be smooth, blemish
free with no dust or other inclusions and no indication of
"orange peel".
6.3 Holiday Detection

6.3.1 100% of the coating shall be checked for holidays using a high
voltage D.C. detector operating at a minimum of 7.5 volts per
micron of coating thickness.
6.3.2 The detector shall be subject to Company approval and shall

be of a type that maintains intimate contact with the coating.
The brush shall be a semi-circular electrode of either fine
brass or bronze.
6.10.1 The operating travel speed shall be determined by performing

tests to locate a purpose-made pin-hole holiday in a good
coating sample.
6.3.4 All holidays and other defects detected shall be marked for
subsequent repair and retesting. No detectable holidays shall
be present in the final coating.
6.3.5 The voltage between electrode and pipe shall be checked at

least twice per shift. Voltage settings shall be in accordance
with NACE-RP-02.
6.3.6 The number of holidays for each joint shall be recorded.

Coated pipe with excessive holidays shall be stripped and
recoated at no added cost to Company. Repair and retesting
of holidays shall be at Contractor's expense.
6.4 Impact Resistance
6.4.1 The impact resistance of the coating shall be checked using

the falling weight test specified in ASTM G14. The test should
be carried out at ambient temperature on the coated
production pipe at six points equally spaced around the pipe.
A minimum impact energy of 1.5 Joules shall be used for all
procedure qualification tests.
6.4.2 The impact energy to just cause jeeping in production holiday

detection tests shall be determined for each of the first twenty
production pipes. An impact energy equal to 75% of the mean
of these values, which must be at least equal to Manufacturer's
stated value, shall be used for subsequent tests, and shall not
cause detectable holidays.
6.4.3 Notwithstanding the foregoing, the minimum impact energy

level for subsequent tests shall be 2.5 Joules for 28 mils (700
micron) minimum coating thickness.
6.5 Coating Thickness
6.10.1 The thickness of the cured epoxy film shall be checked using a
magnetic type gauge. Four measurements equally spaced
around the pipe circumference shall be made at each quarter
length distance along the pipe for the first five
joints of each working shift. If these tests do not demonstrate

uniformly acceptable results, additional joints shall be tested
until acceptable results can be demonstrated. Four
measurements, equally spaced along the pipe, shall be made
on each pipe joint thereafter. In the case of Submerged Arc
Welded Pipe or Electric Resistance Welded Pipe, particular
attention shall be paid to the longitudinal seam area.
6.5.2 The nominal coating thickness shall be 30 mils (750 microns).

The thickness shall not be less than 28 mils (700 microns) and
not greater than 36 mils (900 microns). Thickness below the
minimum value of 28 mils (700 microns) or above the
maximum of 36 mils (900 microns) shall not be acceptable
unless specifically approved by Company's representative.
6.6 Flexibility
6.6.1 Four samples 12 inches long by 1 inch wide shall be cut from
the coated pipe at equal spacing around the circumference.
The samples shall than be bent over a mandrel or subject to a
flattening/compression test, such that the specimen undergoes
a mean tensile strain of 1.5% at (68°F) 20°C.
6.6.2 After bending, the samples shall have no visible cracks and
shall then pass a holiday detection test (having been suitably
insulated at the cut edges). Samples shall also be tested for
adhesion at two locations near the centre of the sample.
6.7 Cross Section Inspection
6.7.1 The area of epoxy coating used for the adhesion test shall be
examined under a microscope. No significant inclusions,
laminations or excessive foaming shall be visible on the cut
surfaces when examined at a magnification of X25.
6.8 Cure
6.8.1 The degree of cure of the coating shall be determined by

Differential Scanning Calorimetry (DSC) analysis.
6.8.2 Epoxy samples of full film thickness shall be taken using

hammer and chisel technique and then ground to a fine
powder. The extract procedural details of the analysis will vary
depending on the calorimeter employed, but a range of glass
transition temperatures shall be obtained using a method
approved by Company. Acceptable values will vary with
different types of epoxy powder but shall be agreed by
Company.
6.8.3 At Company's sole option, Contractor may confirm

completeness of coating cure by performing an methyl ethyl
ketone (MEK) double rub test in lieu of DSC analysis. Placing
a cotton cloth around a forefinger and saturating with MEK, rub
the film with 2-inch (50.4 mm) long firm strokes. Fifty double
rubs (50 in (1,270 MM) each direction) shall not cause
softening or removal of coating. Only minor discolouration of
the rubbing cloth shall be acceptable.
6.8.4 When working with MEK, appropriate safety precautions shall

be taken. MEK is flammable and shall be kept away from
open flames or other sources of ignition. This solvent
resistance test shall, if practical, be performed outdoors to
minimise risks.
6.9 Cathodic Disbondment
6.9.1 The resistance of the coating to disbondment under the

influence of cathodic protection currents shall be checked in
accordance with Cathodic Disbondment Test (24 hour) in
Appendix B.
6.10 Destructive Tests
6.10.1 For the destructive tests, sufficient length of production pipe

shall be cut and then cut into the required samples. The
coating on the cut end of the pipe length shall be cut back to
the specified amount and the end shall be bevelled in
accordance with Specification AGS-28. After bevelling, the cut
end shall be ultrasonically inspected on a 2-inch (50.8 mm)
wide band around the complete circumference of the pipe end
and magnetic particle inspection carried out on the end bevels
to detect any lamination or inclusions.
Laminations exceeding the API 5L and Specification AGS-28

limitations, which extend into the bevel of the pipe, are
unacceptable and shall be removed by further cutting back the

pipe end.
6.10.2 The ultrasonic inspection shall be performed by qualified

personnel in accordance with a Company approved procedure.
Records of each ultrasonic inspection performed shall be
maintained by Contractor. Company approved personnel only
shall be used.
6.10.3 Any damage caused by destructive testing shall be repaired as

described in Section 7.0 and again checked for holidays.
6.11 Hot Water Soak Test
6.11.1 A hot water soak test shall be conducted by Contractor in

accordance with Hot Water Soak Test (24 hour) in Appendix A.
6.12 Hardness
Hardness tests shall be carried out at six points equally spaced around
the pipe. Coating samples shall be harder than 85 Bucholz (DIN 53153)
at standard climatic conditions ie. 73°F(23°C) temperature and 50%
relative humidity.
6.13 Abrasion
Taber abrasion resistance using a 500 gram wheel shall result in a loss
of less than 0.025 gram after 1000 cycles in accordance with ASTM
D4060. Four test panels (100 mm x 100 mm x 10 to 12 mm thick) shall
be coated for this test by a process as close as practicable to that used
for pipe coating.
7.0 REPAIRS
7.1 Repairs may be made locally to small areas of damaged or pinholed

coating. The maximum area of such repair is 1 square inch. Repairs
shall not be made within 4 inches (101.6 mm) of the end of the pipe. If
the area exceeds 1 square inch, the pipe shall be stripped, cleaned, and
recoated.
7.2 The area shall be abraded by grinding or wire brushing until clean steel to
SIS 05 5900 Sa 2.5 is obtained. The adjacent good coating shall be
feathered, and all contaminants, dust, etc. removed. Valspar 46-F640 or
a Company approved equivalent patching compound shall be used for all
coating repairs. The compound shall be applied to the specified nominal
thickness, in accordance with coating Manufacturer's recommended

procedures. Patch sticks shall not be used for coating repair.
7.3 Repair of holidays shall be limited to one repair per square metre of
coated pipe. If coating holidays exceed one per square metre, then that
pipe shall be stripped, cleaned, and recoated.
7.4 Repairs shall be carefully controlled and shall be inspected and holiday
tested after curing.
8.0 DOCUMENTATION AND CERTIFICATION
8.1 The following documentation, written in the English language, shall be

submitted to the Company for approval prior to dispatch of coated pipe.
a) Mill certificates for line pipe received.
b) Epoxy Manufacturer's certificates for each batch received, as

specified in Section 3.0.
c) Records, results, and other documentation of all epoxy powder and

coating tests.
d) Materials Control Records.
8.2 Materials shall be delivered with certificates according to DIN 50 049 3.1
C.
9.0 SHIPPING AND HANDLING
9.1 All loose matter, foreign substances, dirt, steel shot and other debris shall
be removed from inside pipe before stockpiling or shipping. Any epoxy
inside the pipe shall be removed with solvents and wiped clean.
9.2 The coated pipe shall be stored, handled and transported in such a
manner to prevent damage to the pipewalls, bevelled ends and the
coating. Damage to pipe, pipe ends or coating during handling shall be
repaired by Contractor at its expense. Pipe damaged beyond repair shall
be replaced at Contractor's expense.
9.3 All pipe shall be raised or lowered to or from the stockpile, ground, truck,
barge, etc., by means of end hooks engaging the ends of the pipe, and
carried by wire rope or chain sling with a "spreader bar" between lifting
lines.
Coated pipe shall be picked up clear of the ground and not be dragged.
Coated pipe shall not be subjected to impact and all supports for coated
pipe shall be suitably padded. When stacking coated pipe, a minimum of
three separator pads shall be used per 40-foot (12.2 M) joint. These
separator pads shall be 3/4 inch (19.05 mm) thick rubber tire tread,
synthetic rope or Company approved equal and shall prevent contact
between coated pipe surfaces and any other surface while stacked.
9.4 To avoid deformation of the pipe and damage to pipe coatings, stacking
heights shall be restricted. Contractor shall calculate and present to
Company for approval the maximum permitted stacking heights. The
number of bearers shall also be subject to Company approval. Unless
agreed otherwise, the following allowable stress levels shall be used to
evaluate the maximum allowable stacking heights for coated and/or
uncoated linepipe on land.
Allowable Stress Levels
Material Limiting Stress

Steel 50% of Yield Stress
Concrete 50% of Cube Strength (28 day)
In addition to these stress criteria, stacking heights shall be limited so

that elastic deformation of the pipe due to stacking does not cause
cracking of the concrete coating.
Contractor shall include a dead load amplification factor for the

stockpiling of coated and/or uncoated linepipe during transportation
which takes into account the dynamic nature of the transport. Unless
agreed otherwise, Contractor shall apply a minimum factor of
1.35 to the dead weight of the coated and/or uncoated linepipe to account
for these effects prior to application of the allowable stress levels.
Stacking height shall be reduced at the request of Company or its

representative if he observes deleterious effects to the pipe or its coating
due to stacking. Bare pipe stockpiles or corrosion coated pipe shall not
be stacked directly on the ground, but shall be stacked on polyethylene
covered sand berms at least 12 inches (304.8 mm) above ground level.
9.5 If bevel protectors and/or end caps are provided on Company supplied
pipe, they shall be removed for coating and reinstalled by Contractor prior
to shipment of coated pipe joints. Bevel protectors and/or end caps
which are lost after receipt of the pipe by Contractor shall be replaced at
Contractor expense prior to shipment.
10.0 PERFORMANCE
Contractor represents and warrants that it is familiar with the work to be

performed pursuant to these specifications and all hazards and difficulties
incident to the performance of the work. Contractor shall be liable to Company
for damages, theft or loss of pipe from the time of receipt of the pipe until the
coated pipe is received and accepted by Company. Contractor shall guarantee
that all material and workmanship is in accordance with these specifications and
shall agree to repair, at its expense, any coating which is found to be defective.
11.0 ACCEPTABLE FBE POWDERS
1) Dulux NAP - GUARD 7-2500
2) 3M Skotchkote - 206N
APPENDIX A
HOT WATER SOAK TEST (24 HOURS)
1.0 SCOPE
Determination of the water resistance of fusion bonded epoxy on coated pipe

samples.
2.0 EQUIPMENT
2.1 Slow cooker (Dutch Boiler) with 5 to 7 litre capacity.
2.2 Thermometer.
3.0 TEST SPECIMEN
Test ring sample shall be minimum 4 inches (100 mm) square x pipe wall
thickness.
4.0 PROCEDURE
4.1 Fill cooker with tap water and heat to 80 to 90°C (175 to 195°F) and allow
to stabilise for one hour.
4.2 Immerse test ring sample in hot water, cover, and operate cooker for 24
hours. Maintain water level constant by addition of warm tap water.
4.3 Remove test ring sample, pat dry, inspect for blisters, and inspect for
hardness (fingernail test).
4.4 Using a utility knife with a sharp blade, cut two 1-inch (25.4 mm) long
scribes crosswise at 45° angle, insuring the cuts penetrate to substrate.
4.5 Air cool sample to room temperature but within 2 hours, test for adhesion
by inserting tip of knife at junction of cuts and flipping upward.
5.0 REPORTING AND GRADING
5.1 Report pipe joint number, date pipe was coated, powder batch number,
and date of test.
5.2 No. 1 rating: Chipping, but no peeling - pass excellent.
No. 2 rating: Chipping, with some peeling - pass fair.
No. 3 rating: Peeling with little or no chipping - fails.

5.3 Examine back of any peeled coating for contamination and report it as a
percentage of exposed area. If little or no contamination is present,
check and report degree of cure by cold bend, impact, and/or differential
scanning calorimeter (DSC) tests.
Arthit project GENERAL SPECIFICATION AGS-32
APPENDIX B
CATHODIC DISBONDMENT TEST (24 HOURS)
1.0 SCOPE
To provide an assessment of the resistance of the coating to disbondment when

subjected to cathodic protection.
2.0 EQUIPMENT
2.1 DC powder supply unit.
2.2 Platinum or platinum-coated anode wire.
2.3 Electrolyte solution consisting of 3 wt % sodium chloride (NaCI) in

distilled water.
2.4 Plastic cylinder 3-½ inches (90 mm) diameter, 4 inches (100 mm) long.
2.5 High resistance volt/amp meter.
2.6 Hot plate or oven capable of maintaining 0-75° ± 3°C (32-170 ± 5°F).
2.7 Calomel reference electrode.
2.8 Utility knife.
3.0 TEST SPECIMEN
3.1 The test specimen shall be a minimum 4 inches (100 mm) square
segment cut from the test ring.
3.2 Drill a ¼ inch (6 mm) diameter holiday in the coating at the centre of the
specimen.
3.3 Glue plastic cylinder onto specimen with holiday at centre of cylinder
4.0 PROCEDURE
4.1 Pour approximately 350 ml (3/4 pint) of electrolyte into the plastic
cylinder.
4.2 When testing specimens cut from pipe, it is necessary to employ a heat
transfer medium (e.g., steel shot or grit) in order to provide uniform
heating of the specimen. Use of a metal pan partially filled with the heat
transfer medium into which the specimen is implanted is preferable.
Arthit project GENERAL SPECIFICATION AGS-32
Place on a hot plate or in an oven to maintain the substrate temperature

at 66°C (150°F) for the 24 hour test.
4.3 Connect the negative lead from power supply to specimen and positive
lead to anode.
4.4 Turn on power supply and apply voltage to the test specimen; negative
3.5 V with respect to the calomel reference electrode for the 24 hour test.
4.5 Monitor the voltage, temperature, and electrolyte level from the start.
4.6 At the 24 hour point, remove the 24 hour test cell from the hot plate or
oven, immediately drain electrolyte from the cell, dismantle the test cell,
and air cool the sample to room temperature. The evaluation shall be
performed within 1 hour of removal from hot plate.
4.7 Using a utility knife, make radial cuts through the coating to the substrate.
The radial cuts are to be at least 0.8 inch (20 mm) in length.
4.8 Insert the blade of a utility knife under the coating. Using a levering
action, chip off the coating. Continue until the coating demonstrates a
definite resistance to the levering action.
4.9 Measure the radius of the disbonded area from the holiday edge along
each radial cut and average the measured results.
5.0 REPORTING AND GRADING
5.1 Report pipe joint number, date pipe was coated, powder batch number,
and date of test.
5.2 Report average of the radius of disbondment from the holiday edge.
5.3 The specimen shall be considered to have passed the test if the average
radius of disbondment is 0.3 inches (8 mm) or less.
APPENDIX C
TABLE 1
FREQUENCY OF COATING INSPECTION
TEST FREQUENCY SECTION

Visual Inspection Each Pipe 6.2
Holiday Inspection Each Pipe 6.3
Impact Resistance Once per 20 Pipes 6.4
Adhesion Once per 20 Pipes 6.5
Coating Thickness Each Pipe 6.6
Flexibility Once per 400 Pipes 6.7
Cross Section Inspection Once per 20 Pipes 6.8
Cure Once per 20 Pipes 6.9
Cathodic Disbondment Once per 400 Pipes 6.10
Hot Water Soak Test Once per 400 Pipes 6.12
Hardness Once per 400 Pipes 6.13
Abrasion Once per 400 Pipes 6.14

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Arthit Project GENERAL SPECIFICATION AGS-32

PIPELINE EXTERNAL FUSION BONDED Rev.0

Revision Description Date

2.0 CODES AND STANDARDS 5

3.0 MATERIAL AND EQUIPMENT 6

4.0 C0ATING PROCEDURES 7

5.0 COATING OF LINEPIPE 8

6.0 INSPECTION AND TESTING 14

8.0 DOCUMENTATION AND CERTIFICATION 19

9.0 SHIPPING AND HANDLING 19

11.0 ACCEPTABLE FBE POWDERS 21

APPENDIX A HOT WATER SOAK TEST (24 HOURS) 22

APPENDIX B CATHODIC DISBONDMENT TEST (24 HOURS) 24

APPENDIX C TABLE 1, FREQUENCY OF COATING INSPECTION 26

This Specification shall govern the material, application, repairs in plant,

Company PTT Exploration & Production Public Company Limited.

Contractor Party responsible for anti corrosion coating application.

Manufacturer Coating product manufacturer or supplier.

All work shall be performed in accordance with International Quality Standard

All costs incurred in producing coated linepipe shall be at Contractor's expense

2.0 CODES AND STANDARDS

2.1 National Association Of Corrosion Engineers

NACE RP-02 Recommended Practice for High Voltage Electrical

2.2 American Society Of Testing Materials

ASTM D4060 Abrasion Resistance of Organic Coatings by the

ASTM G-14 Test for Impact Resistance of Pipeline Coatings

ASTM G-8 Test for Cathodic Disbonding of Pipeline Coatings

2.3 Swedish Standard Institute

SIS 05-5900 Pictorial Surface Preparation Standards for Painting

DIN 50049 Certificates on Material Testing

DIN 53153 Testing of Paints, Varnishes and Similar Coating

2.5 British Standards

BS 7079 Preparation of Steel Substrates Before Application of

BS 5493 Protective Coating of Iron and Steel Structures

2.6 International Standards

ISO 2808 Paints and Varnishes. Determination of Film

2.7 Company Specifications

AGS - 28 Steel Linepipe for Pipelines

3.0 MATERIAL AND EQUIPMENT

3.4 Contractor shall supply all materials including:

• Coating Repair Material (Valspar 46-F640, Or Company Approved

• All Equipment For Handling, Cleaning And Coating Linepipe;

• All Test Equipment To Measure Or Inspect For Profile, Ph,

• All Instruments Or Standards For Calibrating Such Devices And All

Contractor shall also obtain from Manufacturer a film approximately 30

Specimen dimensions shall be 6 inches x 4 inches (152.4 mm x 101.6

3.6 Contractor shall obtain from Manufacturer a thermal (Differential

3.9 Powder shall be stored in accordance with Manufacturer's

4.0 COATING PROCEDURES

6.10 Contractor shall submit a detailed written description of the coating

details and results of tests on a similar coating or trials performed by

6.11 The procedures for coating shall include:

• Handling and storage;

• Testing and inspection;

The equipment description shall cover all handling, cleaning, coating,

5.0 COATING OF LINEPIPE

5.1 Salt Testing

Contractor shall submit his salt-test procedures to Company for review

6.10.1 After washing and prior to blast cleaning, moisture shall be