ISO 21809-3:2008

Petroleum and natural gas industries - External coatings for buried or submerged pipelines used in pipeline transportation systems - Part 3: Field joint coatings

ISO 21809-3:2008 specifies requirements for field joint coating of seamless or welded steel pipes for pipeline transportation systems in the petroleum and natural gas industries as defined in ISO 13623. ISO 21809-3:2008 specifies the qualification, application and testing of the corrosion protection coatings applied to steel surfaces left bare after the pipes and fittings (components) are joined by welding. ISO 21809-3:2008 does not address additional mechanical protection, thermal insulation or joint infills for concrete weight-coated pipes. ISO 21809-3:2008 defines and codifies the different types of field joint coatings for buried or submerged pipelines as presented in Table 1.

Industries du pétrole et du gaz naturel — Revêtements externes des conduites enterrées ou immergées utilisées dans les systèmes de transport par conduites — Partie 3: Revêtements des joints soudés sur site

General Information

• Status: Withdrawn
• Publication Date: 01-Dec-2008
• Withdrawal Date: 01-Dec-2008
• ICS: 75.200 - Petroleum products and natural gas handling equipment
• Technical Committee: ISO/TC 67/SC 2 - Pipeline transportation systems
• Drafting Committee: ISO/TC 67/SC 2/WG 14 - External pipeline protective coatings
• Current Stage: 9599 - Withdrawal of International Standard
• Start Date: 15-Feb-2016
• Completion Date: 13-Dec-2025

Relations

• Amended By: ISO 21809-3:2008/Amd 1:2011 - Petroleum and natural gas industries - External coatings for buried or submerged pipelines used in pipeline transportation systems - Part 3: Field joint coatings - Amendment 1
• Effective Date: 14-Oct-2020
• Revised: ISO 21809-3:2016 - Petroleum and natural gas industries - External coatings for buried or submerged pipelines used in pipeline transportation systems - Part 3: Field joint coatings
• Effective Date: 26-Nov-2011

Standards Content (Sample)

INTERNATIONAL ISO
STANDARD 21809-3
First edition
2008-12-15
Petroleum and natural gas industries —
External coatings for buried or
submerged pipelines used in pipeline
transportation systems —
Part 3:
Field joint coatings
Industries du pétrole et du gaz naturel — Revêtements externes des
conduites enterrées ou immergées utilisées dans les systèmes de
transport par conduites —
Partie 3: Revêtements des joints soudés sur site

Reference number
©
ISO 2008
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ii © ISO 2008 – All rights reserved

Contents Page
Foreword. vi
Introduction . vii
1 Scope . 1
2 Normative references . 1
3 Terms and definitions. 4
4 Symbols and abbreviated terms . 6
4.1 Symbols . 6
4.2 Abbreviated terms . 7
5 General requirements. 7
5.1 Rounding . 7
5.2 Compliance to standard. 7
6 Information to be supplied by the purchaser . 8
6.1 General information. 8
6.2 Additional information. 8
7 Application procedures and qualification. 9
7.1 Application procedure specification (APS). 9
7.2 Coating materials. 9
7.3 Procedure qualification trial (PQT) . 10
7.4 Pre-production trial (PPT) . 11
7.5 Qualification of coating and inspection personnel . 11
7.6 Production testing and inspection. 11
7.7 Certificates of compliance and traceability .12
8 Classification of field joint coatings . 12
9 General requirements for surface preparation, coating application, testing and repair. 13
9.1 Surface preparation. 13
9.2 Application of the coating. 14
9.3 Visual inspection of the applied coating. 14
9.4 Testing of the field joint coating . 14
9.5 Repairs. 15
9.6 Verification and storage of coating materials. 15
10 Bituminous, petrolatum, wax and polymeric tape coatings. 15
10.1 Coating identification . 15
10.2 Description of the coatings . 15
10.3 Surface preparation. 15
10.4 Coating application. 16
10.5 Testing of the applied coatings. 17
11 Heat-shrinkable coatings . 25
11.1 Coating identification . 25
11.2 Description of the coatings . 25
11.3 Surface preparation. 26
11.4 Application of the coatings. 26
11.5 Testing of the applied coatings. 27
12 Fusion-bonded epoxy (FBE) powder coatings . 31
12.1 Coating identification . 31
12.2 Description of the coatings . 32
12.3 Surface preparation. 32
12.4 Application of the coatings. 32
12.5 Testing of the applied coatings . 33
13 Liquid coatings. 35
13.1 Coating identification . 35
13.2 Description of the coatings. 35
13.3 Surface preparation . 35
13.4 Application of the coatings. 36
13.5 Testing of the applied coatings . 36
14 Polyolefin-based coatings. 41
14.1 Coating identification . 41
14.2 Description of the coatings. 41
14.3 Surface preparation . 42
14.4 Application of the coating. 43
14.5 Testing of the applied coatings . 44
15 Thermal spray aluminium (TSA) coatings . 49
15.1 Coating identification . 49
15.2 Description of the coating. 49
15.3 Qualification. 49
15.4 Surface preparation . 49
15.5 Application of the coating. 49
15.6 Testing of the applied coating . 50
16 Hot-applied microcrystalline wax coatings . 51
16.1 Coating identification . 51
16.2 Description of the coating. 52
16.3 Surface preparation . 52
16.4 Application of the coating. 52
16.5 Testing of the applied coatings . 53
17 Elastomeric coatings . 54
17.1 Coating identification . 54
17.2 Description of the coatings. 55
17.3 Surface preparation . 55
17.4 Application of the coatings. 55
17.5 Testing of the applied coatings . 56
Annex A (normative) Inspection of thickness . 60
Annex B (normative) Holiday detection test. 61
Annex C (normative) Adhesion test — Resistance to removal . 62
Annex D (normative) Peel-strength test. 64
Annex E (normative) Thermal analysis of epoxy powder and cured coating film (FBE) . 68
Annex F (normative) Cathodic disbondment test . 72
Annex G (normative) Impact test . 78
Annex H (normative) Indentation test. 80
Annex I (normative) Hot-water immersion test. 82
Annex J (normative) Drip resistance of petrolatum and wax tapes. 84
Annex K (normative) Specific electrical insulation resistance. 85
Annex L (normative) Lap shear strength . 87
Annex M (normative) Peel strength between layers . 89
Annex N (normative) Thermal ageing resistance. 92
Annex O (normative) Test programmes for procedure for qualification trials, pre-production trials
or production testing . 96
iv © ISO 2008 – All rights reserved

Bibliography . 99

Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies
(ISO member bodies). The work of preparing International Standards is normally carried out through ISO
technical committees. Each member body interested in a subject for which a technical committee has been
established has the right to be represented on that committee. International organizations, governmental and
non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the
International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.
The main task of technical committees is to prepare International Standards. Draft International Standards
adopted by the technical committees are circulated to the member bodies for voting. Publication as an
International Standard requires approval by at least 75 % of the member bodies casting a vote.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. ISO shall not be held responsible for identifying any or all such patent rights.
ISO 21809-3 was prepared by Technical Committee ISO/TC 67, Materials, equipment and offshore structures
for petroleum, petrochemical and natural gas industries, Subcommittee SC 2, Pipeline transportation systems.
ISO 21809 consists of the following parts, under the general title Petroleum and natural gas industries —
External coatings for buried or submerged pipelines used in pipeline transportation systems:
⎯ Part 1: Polyolefin coatings (3-layer PE and 3-layer PP)
⎯ Part 2: Fusion-bonded epoxy coatings
⎯ Part 3: Field joint coatings
⎯ Part 4: Polyethylene coatings (2-layer PE)
⎯ Part 5: External concrete coatings
A Part 6, dealing with bitumen, asphalt and coaltar coatings, a Part 7, dealing with liquid coatings, a Part 8,
dealing with thermal insulation coatings, and a Part 9, dealing with epoxy polyamide powder coatings (2-layer)
are under preparation.
vi © ISO 2008 – All rights reserved

Introduction
Users of this part of ISO 21809 should be aware that further or differing requirements can be needed for
individual applications. This part of ISO 21809 is not intended to inhibit a vendor from offering, or the
purchaser from accepting, alternative equipment or engineering solutions for the individual application. This
can be particularly applicable where there is innovative or developing technology. Where an alternative is
offered, the vendor should identify any variations from this part of ISO 21809 and provide details.

INTERNATIONAL STANDARD ISO 21809-3:2008(E)

Petroleum and natural gas industries — External coatings for
buried or submerged pipelines used in pipeline transportation
systems —
Part 3:
Field joint coatings
1 Scope
This part of ISO 21809 specifies requirements for field joint coating of seamless or welded steel pipes for
pipeline transportation systems in the petroleum and natural gas industries as defined in ISO 13623. This part
of ISO 21809 specifies the qualification, application and testing of the corrosion protection coatings applied to
steel surfaces left bare after the pipes and fittings (components) are joined by welding.
This part of ISO 21809 does not address additional mechanical protection, thermal insulation or joint infills for
concrete weight-coated pipes.
This part of ISO 21809 defines and codifies the different types of field joint coatings for buried or submerged
pipelines as presented in Table 1.
NOTE Pipes coated in accordance with this part of ISO 21809 are considered suitable for further protection by
means of cathodic protection.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated
references, only the edition cited applies. For undated references, the latest edition of the referenced
document (including any amendments) applies.
ISO 31-0:1992, Quantities and units — Part 0: General principles
ISO 34-1, Rubber, vulcanized or thermoplastic — Determination of tear strength — Part 1: Trouser, angle and
crescent test pieces
ISO 37, Rubber, vulcanized or thermoplastic — Determination of tensile stress-strain properties
ISO 62, Plastics — Determination of water absorption
ISO 188, Rubber, vulcanized or thermoplastic — Accelerated ageing and heat resistance tests
ISO 527-2, Plastics — Determination of tensile properties — Part 2: Test conditions for moulding and
extrusion plastics
ISO 527-3, Plastics — Determination of tensile properties — Part 3: Test conditions for films and sheets
ISO 868, Plastics and ebonite — Determination of indentation hardness by means of a durometer (Shore
hardness)
ISO 1431-1:2004, Rubber, vulcanized or thermoplastic — Resistance to ozone cracking — Part 1: Static and
dynamic strain testing
ISO 1523, Determination of flash point — Closed cup equilibrium method
ISO 1817, Rubber, vulcanized — Determination of the effect of liquids
ISO 2178, Non-magnetic coatings on magnetic substrates — Measurement of coating thickness — Magnetic
method
ISO 2781:2008, Rubber, vulcanized or thermoplastic — Determination of density
ISO 2808, Paints and varnishes — Determination of film thickness
ISO 2811-1, Paints and varnishes — Determination of density — Part 1: Pyknometer method
ISO 3251, Paints, varnishes and plastics — Determination of non-volatile-matter content
ISO 3417, Rubber — Measurement of vulcanization characteristics with the oscillating disc curemeter
ISO 3801, Textiles — Woven fabrics — Determination of mass per unit length and mass per unit area
ISO 4591, Plastics — Film and sheeting — Determination of average thickness of a sample, and average
thickness and yield of a roll, by gravimetric techniques (gravimetric thickness)
ISO 4593, Plastics — Film and sheeting — Determination of thickness by mechanical scanning
ISO 4624, Paint and varnishes — Pull-off test for adhesion
ISO 4625-1, Binders for paints and varnishes — Determination of softening point — Part 1: Ring-and-ball
method
ISO 5893, Rubber and plastics test equipment — Tensile, flexural and compression types (constant rate of
traverse) — Specification
ISO 7619 (all parts), Rubber, vulcanized or thermoplastic — Determination of indentation hardness
ISO 8501-1:2007, Preparation of steel substrates before application of paints and related products — Visual
assessment of surface cleanliness — Part 1: Rust grades and preparation grades of uncoated steel
substrates and of steel substrates after overall removal of previous coatings
ISO 8502-3:1992, Preparation of steel substrates before application of paints and related products — Tests
for the assessment of surface cleanliness — Part 3: Assessment of dust on steel surfaces prepared for
painting (pressure-sensitive tape method)
ISO 8502-6, Preparation of steel substrates before application of paints and related products — Tests for the
assessment of surface cleanliness — Part 6: Extraction of soluble contaminants for analysis — The Bresle
method
ISO 8502-9, Preparation of steel substrates before application of paints and related products — Tests for the
assessment of surface cleanliness — Part 9: Field method for conductometric determination of water-soluble
salts
ISO 8503-1, Preparation of steel substrates before application of paints and related products — Surface
roughness characteristics of blast-cleaned steel substrates — Part 1: Specifications and definitions for ISO
surface profile comparators for the assessment of abrasive blast-cleaned surfaces
2 © ISO 2008 – All rights reserved

ISO 8503-2, Preparation of steel substrates before application of paints and related products — Surface
roughness characteristics of blast-cleaned steel substrates — Part 2: Method for the grading of surface profile
of abrasive blast-cleaned steel — Comparator procedure
ISO 8503-4, Preparation of steel substrates before application of paints and related products — Surface
roughness characteristics of blast-cleaned steel substrates — Part 4: Method for the calibration of ISO surface
profile comparators and for the determination of surface profile — Stylus instrument procedure
ISO 8503-5:2003, Preparation of steel substrates before application of paints and related products — Surface
roughness characteristics of blast-cleaned steel substrates — Part 5: Replica tape method for the
determination of the surface profile
ISO 8504-3, Preparation of steel substrates before application of paints and related products — Surface
preparation methods — Part 3: Hand- and power-tool cleaning
ISO 10474, Steel and steel products — Inspection documents
ISO 11124 (all parts), Preparation of steel substrates before application of paints and related products —
Specifications for metallic blast-cleaning abrasives
ISO 11126 (all parts), Preparation of steel substrates before application of paints and related products —
Specifications for non-metallic blast-cleaning abrasives
ISO 11357-2, Plastics — Differential scanning calorimetry (DSC) — Part 2: Determination of glass transition
temperature
ISO 11357-6, Plastics — Differential scanning calorimetry (DSC) — Part 6: Determination of oxidation
induction time (isothermal OIT) and oxidation induction temperature (dynamic OIT)
ISO 13623:—, Petroleum and natural gas industries — Pipeline transportation systems
ISO 21809-2, Petroleum and natural gas industries — External coatings for buried and submerged pipelines
used in pipeline transportation systems — Part 2: Fusion-bonded epoxy coatings
1)
ASTM D 70 , Standard Test Method for Density of Semi-Solid Bituminous Materials (Pycnometer Method)
ASTM D 92, Standard Test Method for Flash and Fire Points by Cleveland Open Cup Tester
ASTM D 127, Standard Test Method for Drop Melting Point of Petroleum Wax, Including Petrolatum
ASTM D 149, Standard Test Method for Dielectric Breakdown Voltage and Dielectric Strength of Solid
Electrical Insulating Materials at Commercial Power Frequencies
ASTM D 257, Standard Test Methods for DC Resistance or Conductance of Insulating Materials
ASTM D 695, Standard Test Method for Compressive Properties of Rigid Plastics
ASTM D 937, Standard Test Method for Cone Penetration of Petrolatum
ASTM D 938, Standard Test Method for Congealing Point of Petroleum Waxes, Including Petrolatum
ASTM D 1000, Standard Test Method for Pressure-Sensitive Adhesive-Coated Tapes Used for Electrical and
Electronic Applications
ASTM D 1141, Standard Practice for the Preparation of Substitute Ocean Water
ASTM D 1321, Standard Test Method for Needle Penetration of Petroleum Waxes

1) American Society for Testing and Materials, 100 Harbour Drive, West Conshohocken, PA 19428-2959, USA.
ASTM D 2084, Standard Test Method for Rubber Property — Vulcanization Using Oscillating Disk Cure Meter
ASTM D 4285, Standard Test Method for Indicating Oil or Water in Compressed Air
ASTM D 4541, Standard Test Method for Pull-off Strength of Coatings Using Portable Adhesion Testers
2)
SSPC-SP1 , Surface preparation specification No.1 — Solvent cleaning
SSPC CS 23.00, Specification for the Application of Thermal Spray Coatings (Metallizing) of Aluminum, Zinc
and Their Alloys and Composites for the Corrosion Protection of Steel
3)
AWS C2.25/C2.25M , Specification for Thermal Spray Feedstock Solid and Composite Wire and Ceramic
Rods
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
application procedure specification
APS
document describing procedures, methods, equipment and tools used for coating application
3.2
applicator
company that undertakes the coating application in accordance with the provisions of this part of ISO 21809
3.3
batch
quantity of material produced in a continuous manufacturing operation using raw materials of the same source
and grade
3.4
batch certificate
certificate of analysis issued by the manufacturer
3.5
bonding agent
material applied as a film to the primed metal surface in order to ensure adhesion of the subsequent protective
coating
3.6
certificate of compliance
one of the types of inspection documents defined by ISO 10474, issued in accordance with the purchasing
requirements
3.7
coating operative
individual undertaking coating activity on the work site, including surface preparation
3.8
cutback
length of pipe left uncoated at each end for joining purposes (e.g. welding)

th th
2) The Society for Protective Coatings, 40 24 Street, 6 Floor, Pittsburgh, PA 15222-4656, USA.
3) America Welding Society, 550 N.W. Le Jeune Road, Miami, Florida 33126, USA.
4 © ISO 2008 – All rights reserved

3.9
end user
company that owns and/or operates the pipeline system
3.10
field joint area
〈weld zone〉 uncoated area that results when two pipe sections or a pipe section and a fitting with coating
cutbacks are assembled, by welding, in the field
3.11
holiday
coating discontinuity that exhibits electrical conductivity when exposed to a specific voltage
3.12
inspection and testing plan
ITP
document providing an overview of the sequence of inspections and tests, including resources and
procedures
3.13
inspector
end user and/or purchaser’s representative responsible for one or more of the inspections specified in this
document
3.14
manufacturer
company responsible for the manufacture of coating material
3.15
maximum design temperature of field joint coating
T
max
maximum continuous temperature that the field joint coating can resist
3.16
maximum operating temperature
maximum temperature that can be reached during operation of pipeline
3.17
overlap
length of the field joint coating over the plant-applied coating including the coating bevel
3.18
pipeline
those facilities through which fluids are conveyed, including pipe, pig traps, components and appurtenances,
up to and including the isolating valves
[ISO 13623:—, 3.14]
3.19
pipeline system
pipeline with compressor or pump stations, pressure control stations, flow control stations, metering, tankage,
supervisory control and data acquisition system (SCADA), safety systems, corrosion protection systems, and
any other equipment, facility or building used in the transportation of fluids
[ISO 13623:—, 3.16]
3.20
pre-production trial
PPT
application of coating and inspection/testing of its properties, to confirm that the APS is able to produce a field
joint coating with the specified properties, carried out in the field immediately prior to start of production
3.21
primer
material applied as a film on substrate (metal and/or plant coating) to ensure adhesion of the subsequent
protective coating
3.22
procedure qualification trial
PQT
application of a field joint coating and subsequent inspection/testing of its properties, to confirm that the APS
is able to produce a coating with the specified properties, carried out at the premises of the applicator or any
other agreed location
3.23
purchaser
company responsible for providing the product order requirements
3.24
wraparound sleeve
sleeve that is wrapped, circumferentially, around the steel pipe area being coated
4 Symbols and abbreviated terms
4.1 Symbols
C percentage of conversion of FBE coating
∆H exothermic heat of reaction
∆T variation of glass transition temperature between two or more successive thermal analysis scans
g
E elongation at break without heat ageing
E elongation at break after heat ageing for 70 days
E elongation at break after heat ageing for 100 days
P peel strength to pipe surface without heat ageing
P peel strength to pipe surface after heat ageing for 70 days
P peel strength to pipe surface after heat ageing for 100 days
P′ peel strength between layers without heat ageing
P′ peel strength between layers after heat ageing for 70 days
P′ peel strength between layers after heat ageing for 100 days
R specific electrical resistance of a coating
S
R specific electrical resistance after 70 days
S70
R specific electrical resistance after 100 days
S100
t thickness
T maximum design temperature of field joint coating
max
6 © ISO 2008 – All rights reserved

4.2 Abbreviated terms
APS application procedure specification
DFT dry film thickness
DSC differential scanning calorimetry
EP epoxy
EPDM ethylene propylene diene monomer
FBE fusion-bonded epoxy
FJC field joint coating
HSS heat-shrink sleeve
ITP inspection and testing plan
MSDS material safety data sheet
PE polyethylene
PP polypropylene
PPT pre-production trial
PQT procedure qualification trial
PU polyurethane
PVC polyvinylchloride
TSA thermal spray aluminium
2LPE two-layer polyethylene coating
3LPE three-layer polyethylene coating
3LPP three-layer polypropylene coating
5 General requirements
5.1 Rounding
Unless otherwise stated in this part of ISO 21809, to determine conformance with the specified requirements,
observed or calculated values shall be rounded to the nearest unit in the last right-hand place of figures used
in expressing the limiting value, in accordance with ISO 31-0:1992, Annex B, Rule A.
NOTE For the purposes of this provision, the rounding method of ASTM E 29 is equivalent to ISO 31-0:1992,
Annex B, Rule A.
5.2 Compliance to standard
A quality system should be applied to assist compliance with the requirements of this part of ISO 21809.
NOTE ISO/TS 29001 gives sector-specific guidance on quality management systems.
The applicator shall be responsible for complying with the requirements of this part of ISO 21809. It shall be
permissible for the purchaser to make any investigation necessary in order to be assured of compliance by the
applicator and to reject any material that does not comply.
6 Information to be supplied by the purchaser
6.1 General information
The purchase order shall include the following information:
⎯ designation of this part of ISO 21809 and year of publication (ISO 21809-3:2008);
⎯ type of field joint coating system in accordance with Table 1;
⎯ thickness of the field joint coating (if applicable);
⎯ maximum operating temperature of the pipeline;
⎯ cutback length (or length of the field joint being coated), including tolerances;
⎯ pipe material/grade;
⎯ pipe nominal outer diameter and wall thickness;
⎯ plant-applied coating system, including thickness;
⎯ number of field joints being coated;
⎯ type and frequency of certificate of compliance in accordance with ISO 10474 (see 7.7).
6.2 Additional information
The purchase order shall specify which of the following provisions apply for the specific order item:
⎯ permissible field joint coating repairs (see 9.5);
⎯ acceptable level of soluble salts (see 9.1.2.2);
⎯ any special requirement with regard to FJC overall thickness and/or thickness of individual layers;
⎯ overlap on the parent (i.e. “plant-applied”) coating or detailed drawing of the field joint coating with
dimensional tolerances;
⎯ requirements for traceability and marking;
⎯ requirements for documentation and schedule of supply of documentation;
⎯ qualification of the applicator's personnel who apply and/or inspect the coating (see 7.5);
⎯ purchaser’s approval of the application procedure specification (APS) (see 7.1);
⎯ use of specific proprietary coating materials (see 7.2);
⎯ procedure qualification trial (PQT) (see 7.3);
⎯ pre-production trial (PPT) (see 7.4);
⎯ subsequent coating (or infill) being applied;
⎯ temperature range during installation;
8 © ISO 2008 – All rights reserved

⎯ method of installation of the pipeline;
⎯ time constraints for application and number and dimensions of working stations, if relevant;
⎯ specific testing conditions and minimum requirements when applicable (e.g. cathodic disbondment or
flexibility).
7 Application procedures and qualification
7.1 Application procedure specification (APS)
Prior to the start of production and any agreed PQT and/or PPT (see 7.3 and 7.4), the applicator shall prepare
an APS, including
⎯ identification of the coating;
⎯ manufacturer’s instructions for application;
⎯ preparation of steel surface and plant-applied coating, including inspection (see 9.1);
⎯ data sheets defining coating and abrasive blasting material properties, including all health and safety data
(see 7.2 and 9.1.2.2);
⎯ maximum design temperature, T , of field joint coating;
max
⎯ receipt, handling and storage of coating and abrasive blasting materials (see 7.2 and 9.1.2.2);
⎯ coating application procedure, tools and equipment;
⎯ overlap (with tolerances) of FJC over plant coating (a drawing should be considered for certain types of
FJC);
⎯ time required for coating application;
⎯ inspection and testing of applied FJC;
⎯ repair and testing of defective FJC;
⎯ stripping of defective FJC;
⎯ marking, traceability and documentation.
The APS shall cover all items associated with quality control as defined in this part of ISO 21809 and any
agreed options for the specific FJC.
All coating work, testing and inspection shall be carried out according to the APS.
If specified, the APS shall be approved prior to the start of production and prior to any agreed PQT and/or
PPT. Once approved, the APS shall not be changed by the applicator without prior written authorization of the
purchaser.
7.2 Coating materials
7.2.1 The applicator shall provide the data sheets specified in Clauses 10 to 17 for each coating material
from the manufacturer.
7.2.2 In addition to the coating-material data sheets, the applicator shall provide the following information
from the manufacturer:
⎯ batch certificates certifying that the coating materials delivered meet the coating characteristics as set
forth in the coating data sheets, and any agreed optional requirements, if applied according to the
manufacturer’s instructions;
⎯ packaging, transport and storage requirements of coating materials;
⎯ range of application conditions including minimum and maximum application temperatures (for materials
and substrate) and relative humidity;
⎯ material safety data sheet (MSDS).
7.2.3 Marking on each shipment of coating materials shall contain the following information:
⎯ manufacturer's name;
⎯ name and complete identification of material, including plant of origin;
⎯ reference to applicable coating-material standards, if any;
⎯ production batch number;
⎯ mass/size;
⎯ date of production;
⎯ expiry date.
7.3 Procedure qualification trial (PQT)
If specified by the purchaser or otherwise required by this part of ISO 21809, the APS shall be qualified by a
PQT. Test methods and frequencies for PQT are specified in Annex O. Acceptance criteria are given in the
relevant clauses referred to in Annex O.
The applicator may request the manufacturer(s) to assist during the PQT to ensure the correct use of the
coating material(s) and to train applicator personnel.
Qualification tests shall be carried out on representative pipes having the same diameter and thickness as the
production pipes.
NOTE Rejected pipe or pipe that has been used for other testing (e.g. welding qualification) is not considered
representative.
Tests shall be carried out on test zones distributed along a pipe coated with the actual parent (plant-applied)
coating. The length of the test zones shall be equivalent to the field joint coating length.
If not present, a circumferential cap weld shall be added at the centre of each of the test zones to simulate the
field weld.
All tools and equipment (e.g. for induction heating, abrasive blasting, coating application and inspection) being
used for PQT shall be of the same type as those being used for the actual field joint coating.
Unless otherwise specified, at least three test zones shall be coated.
Coating repairs and stripping of defective FJC shall be included in PQT (except if coating repairs are not
allowed).
10 © ISO 2008 – All rights reserved

The time for coating application during PQT shall be consistent with the estimated field joint coating time in the
field. Any significant differences in the PQT environment compared to actual production conditions should be
considered, e.g. number of work stations, similarity of, or differences in, lifting equipment.
For pipelines that experience deformations above 0,3 % during handling or installation, the PQT shall include
relevant tests carried out after reeling. The test temperature shall be at least 5 °C below minimum reeling
temperature.
The applicator shall submit a complete report of the qualification test results to the purchaser for approval.
7.4 Pre-production trial (PPT)
If specified by the purchaser or otherwise required by this part of ISO 21809, a PPT shall be performed on site
to verify the
⎯ coating system;
⎯ coating materials;
⎯ application procedure;
⎯ equipment being used for surface preparation and coating application;
⎯ application of the coating system;
⎯ qualification of the coating operatives and purchaser’s inspectors that will actually be used in the field.
The above shall comply with the requirements of this part of ISO 21809 and the results of any previous PQT.
Test methods and frequencies for PPT are specified in Annex O. Acceptance criteria are given in the relevant
clauses to which reference is made in Annex O.
The PPT shall be carried out in presence of the end user and/or purchaser (or their representative) at the start
of operations when equipment and personnel are mobilized on site. The PPT shall be performed on the first
joints to be coated (or, if agreed, on a dummy pipe).
7.5 Qualification of coating and inspection personnel
The coating operatives shall be qualified to undertake the coating application procedure and repair work. The
qualification may be obtained by demonstration at a PQT, during PPT, via a certification organization or as
agreed with the end user.
The applicator shall request the manufacturer of the coating material(s) and equipment to provide technical
assistance to the coating operatives if necessary.
Inspectors and applicator personnel carrying out the coating inspection shall be trained and qualified.
7.6 Production testing and inspection
The applicator shall perform inspection and testing during production in accordance with an ITP to verify the
surface preparation, coating application and the specified properties of the applied FJC.
The ITP shall be prepared by the applicator and shall be approved by the purchaser prior to the start of the
coating work and prior to the start of any PQT and/or PPT. The ITP shall identify all inspection activities and
tests, their frequency and the relevant inspection authorities.
Test methods and frequencies are specified in Annex O. Acceptance criteria are given in the relevant clauses
to which reference is made in Annex O.
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