SIST EN ISO 21809-1:2019

SLOVENSKI STANDARD
01-januar-2019
1DGRPHãþD
SIST EN ISO 21809-1:2012
Naftna industrija in industrija zemeljskega plina - Zunanje prevleke za cevovode,
zakopane v zemljo ali potopljene v vodo, v sistemih cevovodnega transporta - 1.
del: Poliolefinske prevleke (3-slojni PE in 3-slojni PP) (ISO 21809-1:2018)
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) (ISO 21809-1:2018)
Erdöl- und Erdgasindustrie - Umhüllungen für erd- und wasserverlegte Rohrleitungen in
Transportsystemen - Teil 1: Polyolefinumhüllungen (3-Lagen-PE und 3-Lagen-PP) (ISO
21809-1:2018)
Industries du pétrole et du gaz naturel - Revêtements externes des conduites enterrées
ou immergées utilisées dans les systèmes de transport par conduites - Partie 1:
Revêtements à base de polyoléfines (PE tricouche et PP tricouche) (ISO 21809-1:2018)
Ta slovenski standard je istoveten z: EN ISO 21809-1:2018
ICS:
25.220.99 Druge obdelave in prevleke Other treatments and
coatings
75.200 2SUHPD]DVNODGLãþHQMH Petroleum products and
QDIWHQDIWQLKSURL]YRGRYLQ natural gas handling
]HPHOMVNHJDSOLQD equipment
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN ISO 21809-1
EUROPEAN STANDARD
NORME EUROPÉENNE
November 2018
EUROPÄISCHE NORM
ICS 75.200 Supersedes EN ISO 21809-1:2011
English Version
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) (ISO 21809-1:2018)
Industries du pétrole et du gaz naturel - Revêtements Erdöl- und Erdgasindustrie - Umhüllungen für erd- und
externes des conduites enterrées ou immergées wasserverlegte Rohrleitungen in Transportsystemen -
utilisées dans les systèmes de transport par conduites - Teil 1: Polyolefinumhüllungen (3-Lagen-PE und 3-
Partie 1: Revêtements à base de polyoléfines (PE Lagen-PP) (ISO 21809-1:2018)
tricouche et PP tricouche) (ISO 21809-1:2018)
This European Standard was approved by CEN on 17 September 2018.

CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this
European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references
concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN
member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by
translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management
Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,
Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Turkey and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2018 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 21809-1:2018 E
worldwide for CEN national Members.

Contents Page
European foreword . 3

European foreword
This document (EN ISO 21809-1:2018) has been prepared by Technical Committee ISO/TC 67
"Materials, equipment and offshore structures for petroleum, petrochemical and natural gas industries"
in collaboration with Technical Committee ECISS/TC 110 “Steel tubes, and iron and steel fittings” the
secretariat of which is held by UNI.
This European Standard shall be given the status of a national standard, either by publication of an
identical text or by endorsement, at the latest by May 2019, and conflicting national standards shall be
withdrawn at the latest by May 2019.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN shall not be held responsible for identifying any or all such patent rights.
This document supersedes EN ISO 21809-1:2011.
According to the CEN-CENELEC Internal Regulations, the national standards organizations of the
following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria,
Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia,
France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta,
Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Turkey and the United Kingdom.
Endorsement notice
The text of ISO 21809-1:2018 has been approved by CEN as EN ISO 21809-1:2018 without any
modification.
INTERNATIONAL ISO
STANDARD 21809-1
Second edition
2018-10
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)
Industries du pétrole et du gaz naturel — Revêtements externes
des conduites enterrées ou immergées utilisées dans les systèmes de
transport par conduites —
Partie 1: Revêtements à base de polyoléfines (PE tricouche et PP
tricouche)
Reference number
ISO 21809-1:2018(E)
©
ISO 2018
ISO 21809-1:2018(E)
© ISO 2018
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting
on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address
below or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Fax: +41 22 749 09 47
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii © ISO 2018 – All rights reserved

ISO 21809-1:2018(E)
Contents Page
Foreword .v
Introduction .vi
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 3
4 Conformance . 6
4.1 Rounding . 6
4.2 Compliance with this document . 6
5 Symbols and abbreviated terms . 6
5.1 Symbols . 6
5.2 Abbreviations . 7
6 Information supplied by the purchaser . 7
6.1 General information . 7
6.2 Additional information . 8
7 Coating classification . 9
7.1 General . 9
7.2 Coating classes . 9
7.3 Coating thickness classes . 9
8 Qualification processes .10
8.1 General — Qualification scheme .10
8.2 Application procedure specification .11
8.3 Pre-production trial (PPT) .12
8.4 Inspection and testing plan (ITP) .12
8.5 Procedure qualification trial (PQT) .13
9 Coating material qualification .13
9.1 Composition of the coating system .13
9.2 Qualification of the coating materials .14
9.2.1 General requirements .14
9.2.2 Epoxy material .14
9.2.3 Adhesive material .15
9.2.4 PE/PP top layer material .15
9.3 Batch certificate .17
9.4 Storage and handling of coating materials .18
10 Coating system qualification .18
11 Application of the coating system .19
11.1 General .19
11.2 Surface preparation .20
11.2.1 Initial preparation.20
11.2.2 Abrasive blast cleaning — Cleanliness and surface roughness .20
11.2.3 Surface dust contamination .20
11.2.4 Surface pre-treatment and salt contamination .21
11.3 Coating application.21
11.3.1 General.21
11.3.2 Epoxy application .21
11.3.3 Adhesive application .21
11.3.4 PE/PP application .22
11.3.5 Rough coat application .22
11.4 Cutback .22
12 Inspection and testing .22
ISO 21809-1:2018(E)
12.1 General .22
12.2 Re-testing .25
13 Coating repairs .25
14 Marking .25
14.1 General .25
14.2 Required markings .26
15 Handling and storage in the applicator’s facilities .26
15.1 Handling.26
15.2 Storage .26
16 Test reports and certificate of compliance .26
Annex A (normative) Inspection of thickness .27
Annex B (normative) Holiday detection test .29
Annex C (normative) Peel strength test .31
Annex D (normative) Thermal analysis of epoxy and cured epoxy coating film with T ≤ 115°C .34
g
Annex E (normative) Impact test .39
Annex F (normative) Indentation test .41
Annex G (normative) UV ageing test and thermal ageing test .43
Annex H (normative) Cathodic disbondment test .47
Annex I (normative) Flexibility test .52
Annex J (normative) Gel time of the epoxy powder .54
Annex K (normative) Total volatile/moisture content of the epoxy powder — Mass loss .56
Annex L (normative) Hot water immersion test.58
Annex M (normative) Density of epoxy powder .60
Bibliography .62
iv © ISO 2018 – All rights reserved

ISO 21809-1:2018(E)
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.
The procedures used to develop this document and those intended for its further maintenance are
described in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the
different types of ISO documents should be noted. This document was drafted in accordance with the
editorial rules of the ISO/IEC Directives, Part 2 (see www .iso .org/directives).
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. Details of
any patent rights identified during the development of the document will be in the Introduction and/or
on the ISO list of patent declarations received (see www .iso .org/patents).
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and
expressions related to conformity assessment, as well as information about ISO's adherence to the
World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT) see www .iso
.org/iso/foreword .html.
This document 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.
This second edition cancels and replaces the first edition (ISO 21809-1:2011), which has been technically
revised.
The main changes compared to the previous edition are as follows:
— adoption of qualification processes (Clause 8);
— added prescriptions for coating application on pipes made by corrosion resistant alloys (CRA) or
lined/clad internally with a CRA;
— cathodic disbondment test conditions revised.
A list of all parts in the ISO 21809 series can be found on the ISO website.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www .iso .org/members .html.
ISO 21809-1:2018(E)
Introduction
It is necessary that users of this document be aware that further or differing requirements can be
required for individual applications. This document 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, it is the responsibility of the vendor to identify any variations from this
document and provide details.
vi © ISO 2018 – All rights reserved

INTERNATIONAL STANDARD ISO 21809-1:2018(E)
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)
1 Scope
This document specifies requirements for plant-applied external three-layer polyethylene and
polypropylene based coatings for corrosion protection of welded and seamless steel pipes for pipeline
transportation systems in the petroleum and natural gas industries in accordance with ISO 13623.
NOTE Pipes coated in accordance with this document are considered suitable for further protection by
means of cathodic protection.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements 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 179-1, Plastics — Determination of Charpy impact properties — Part 1: Non-instrumented impact test
ISO 179-2, Plastics — Determination of Charpy impact properties — Part 2: Instrumented impact test
ISO 306, Plastics — Thermoplastic materials — Determination of Vicat softening temperature (VST)
ISO 527-1, Plastics — Determination of tensile properties — Part 1: General principles
ISO 527-2, Plastics — Determination of tensile properties — Part 2: Test conditions for moulding and
extrusion plastics
ISO 868, Plastics and ebonite — Determination of indentation hardness by means of a durometer (Shore
hardness)
ISO 1133-1, Plastics — Determination of the melt mass-flow rate (MFR) and melt volume-flow rate (MVR)
of thermoplastics — Part 1: Standard method
ISO 1183 (all parts), Plastics — Methods for determining the density of non-cellular plastics
ISO 2808, Paints and varnishes — Determination of film thickness
ISO 2811 (all parts), Paint and varnishes — Determination of density
ISO 3183, Petroleum and natural gas industries — Steel pipe for pipeline transportation systems
ISO 3251, Paints, varnishes and plastics — Determination of non-volatile-matter content
ISO 4892-2:2013, Plastics — Methods of exposure to laboratory light sources — Part 2: Xenon-arc lamps
ISO 6964, Polyolefin pipes and fittings — Determination of carbon black content by calcination and
pyrolysis — Test method and basic specification
ISO 21809-1:2018(E)
ISO 8130-2, Coating powders — Part 2: Determination of density by gas comparison pyknometer
(referee method)
ISO 8130-3, Coating powders — Part 3: Determination of density by liquid displacement pyknometer
ISO 8130-7, Coating powders — Part 7: Determination of loss of mass on stoving
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, 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 the conductometric determination of
water-soluble salts
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, 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 10350-1, Plastics — Acquisition and presentation of comparable single-point data — Part 1: Moulding
materials
ISO 10474:2013, 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 and glass transition step height
ISO 11357-6, Plastics — Differential scanning calorimetry (DSC) — Part 6: Determination of oxidation
induction time (isothermal OIT) and oxidation induction temperature (dynamic OIT)OIT) and oxidation
induction temperature (dynamic OIT)
ISO 15512, Plastics — Determination of water content
ISO 17855-2, Plastics — Polyethylene (PE) moulding and extrusion materials — Part 2: Preparation of test
specimens and determination of properties
ISO 18553, Method for the assessment of the degree of pigment or carbon black dispersion in polyolefin
pipes, fittings and compounds
ISO 19069-2, Plastics — Polypropylene (PP) moulding and extrusion materials — Part 2: Preparation of
test specimens and determination of properties
ISO 21809-2, Petroleum and natural gas industries — External coatings for buried or submerged pipelines
used in pipeline transportation systems — Part 2: Single layer fusion-bonded epoxy coatings
2 © ISO 2018 – All rights reserved

ISO 21809-1:2018(E)
ISO 80000-1, Quantities and units – Part 1: General
EN 10204:2004, Metallic materials — Types of inspection documents
ASTM D792, Standard Test Methods for Density and Specific Gravity (Relative Density) of Plastics by
Displacement
ASTM D1505, Standard Test Method for Density of Plastics by the Density-Gradient Technique
ASTM D1693, Standard Test Method for Environmental Stress-Cracking of Ethylene Plastics
ASTM D4940, Standard Test Method for Conductimetric Analysis of Water Soluble Ionic Contamination of
Blast Cleaning Abrasives
1)
SSPC-AB 1, Mineral and Slag Abrasives
SSPC-AB 2, Cleanliness of Recycled Ferrous Metallic Abrasives
SSPC-AB 3, Ferrous Metallic Abrasive
SSPC-SP 1, Solvent Cleaning
SSPC-Guide 15, Field Methods for Extraction and Analysis of Soluble Salts on Steel and Other Nonporous
Substrates
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https: //www .iso .org/obp
— IEC Electropedia: available at http: //www .electropedia .org/
3.1
adhesion
bond between coating and substrate
3.2
applicator
company that undertakes the coating application in accordance with the provisions of this document
Note 1 to entry: If the compounding of the top layer is done prior to or during the application process by the
applicator, then the applicator is regarded as the manufacturer (see 3.16).
3.3
application procedure specification
APS
document describing procedures, methods, equipment and tools used for coating application
3.4
batch
quantity of material produced in a continuous manufacturing operation using raw materials of the
same source and grade
3.5
batch certificate
certificate of analysis issued by the manufacturer
1) Society for Protective Coating, 40 24th Street, 6th floor, Pittsburg; PA 15222-4656, USA.
ISO 21809-1:2018(E)
3.6
certificate of compliance
document issued in accordance with ISO 10474 or EN 10204, stating compliance with the purchase
order for coated pipes, but without mention of any test results, issued in accordance with the purchasing
requirements
3.7
coating material qualification
qualification of the coating materials properties carried out by the manufacturer before the coating
system qualification
3.8
coating system qualification
qualification of application method, applied coating system and subsequent inspection/testing of its
properties, to confirm that the APS is adequate to produce a coating with the specified properties
Note 1 to entry: The coating system qualification is not project dependent.
3.9
cutback
length of pipe left uncoated at each end for joining purposes
3.10
design temperature range
temperature range, including maximum and minimum temperatures, likely to be reached during
transport, storage, handling, installation and operation
Note 1 to entry: The design temperature range of the coating can be narrower than that specified for the steel
pipe material and/or the pipeline system.
3.11
dummy pipe
pipe having the same outside diameter and wall thickness of the project pipes. Dummy pipes and
coated dummy pipes shall be representative of the production and shall be coated in accordance with
approved APS
3.12
end user
company (companies) that own(s) and/or operate(s) pipeline(s)
3.13
holiday
coating discontinuity that exhibits electrical conductivity when exposed to a specific voltage
3.14
inspection certificate 3.1
document in accordance with ISO 10474 or EN 10204 giving the results of the testing of coated pipes,
supplied and signed by a representative of the applicator authorized to issue such documents
3.15
inspection and testing plan
ITP
document providing an overview of the sequence of inspections and tests, including appropriate
resources and procedures
3.16
manufacturer
company responsible for the manufacture of coating material(s)
4 © ISO 2018 – All rights reserved

ISO 21809-1:2018(E)
3.17
manufacturer's specification
document that specifies the characteristics, test requirements and application recommendations for
the coating materials
3.18
operating temperature
temperature that can be endured by a pipeline (component) and/or pipeline system during operation,
within the design temperature range
3.19
peel strength
force required for peeling the coating from the substrate
3.20
pipe diameter length
length along the pipe axis equal to the specified outside diameter of the pipe
3.21
pipeline
components of a pipeline system connected together to convey fluids between stations and/or plants,
including pipe, pig traps, components, appurtenances, isolating valves, and sectionalizing valves
[SOURCE: ISO 13623:2017, 3.1.15, modified]
3.22
pipeline system
pipelines, stations, 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
[SOURCE: ISO 13623:2017, 3.1.16]
3.23
pre-production trial
PPT
application of a coating and subsequent inspection/testing of its properties, to confirm that the APS is
adequate to produce a coating with the specified properties, carried out in the coating plant immediately
prior to start of production and to verify that the plant's equipment is adequate to consistently adhere
to the APS requirements
3.24
procedure qualification trial
PQT
application of a coating and subsequent inspection/testing of its properties, to confirm that the APS is
adequate to produce a coating with the specified properties, carried out in correlation to a specific project
3.25
purchaser
company responsible for providing the purchase order requirements
3.26
start up
coating application activities re-start in case of modification of production parameters or unplanned
stoppage or production interruption exceeding 12 h
3.27
test report
document that provides the quantitative test results for tests conducted in accordance with the
requirements of this document
ISO 21809-1:2018(E)
3.28
total coating thickness
sum of all three layers, namely epoxy material, adhesive material and top layer, with the exclusion of
rough coat, if applicable
4 Conformance
4.1 Rounding
Unless otherwise stated in this document, 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 80000-1.
NOTE For the purpose of this provision, the rounding method of ASTM E29 is equivalent to ISO 80000-1.
4.2 Compliance with this document
A quality system and an environmental management system should be applied to assist compliance
with the requirements of this document.
NOTE ISO 9001 gives guidance on quality management systems and ISO 14001 gives guidance on the
selection and use of an environmental management system.
The applicator shall be responsible for complying with all the applicable requirements of this document.
The purchaser shall be allowed to make any investigations necessary to ensure compliance by the
applicator and to reject any material and/or coating that does not comply.
5 Symbols and abbreviated terms
5.1 Symbols
C percentage conversion of FBE coating
d effective sample thickness, expressed in millimetres
D outside diameter of the pipe, expressed in millimetres
ε tensile strain at break, expressed in %
b
Δε difference in tensile strain at break between 2 tests, expressed in %
b
ΔH exothermic heat of reaction, expressed in Joules per gram
M mass, expressed in kilograms or grams
ΔMFR difference in the MFR between two tests, expressed in %
P mass of bare pipe per metre length, expressed in kilograms per metre
m
dQ/dt differential heat flow, expressed in watts per square metre
r mandrel radius, expressed in millimetres
T glass transition temperature, expressed in degrees Celsius
g
6 © ISO 2018 – All rights reserved

ISO 21809-1:2018(E)
ΔT difference in the glass transition temperature between two successive thermal analysis
g
scans, expressed in degrees Celsius
w mass fraction of moisture, expressed as a percentage
m
ρ density of the epoxy powder, expressed in grams per cubic centimetre
p
5.2 Abbreviations
APS application procedure specification
Cr chromium
CRA corrosion resistant alloy
DSC differential scanning calorimetry
ESCR environmental stress cracking resistance
FBE fusion-bonded epoxy
HDPE high-density polyethylene
IR infrared
ITP inspection and testing plan
LDPE low-density polyethylene
MDPE medium-density polyethylene
MFR melt flow rate
N.A. not applicable
NPS nominal pipe size
PDL pipe diameter length
PE polyethylene
PP polypropylene
PPT pre-production trial
PQT procedure qualification trial
SAW submerged arc welding
UV ultraviolet
6 Information supplied by the purchaser
6.1 General information
The purchase order shall include the following information:
a) number of this document and year of publication (ISO 21809-1:2018);
ISO 21809-1:2018(E)
b) pipe quantity, outside diameter, minimum wall thickness, minimum, maximum and nominal length,
grade of steel;
c) bare pipe standard or specification designation, e.g. ISO 3183;
d) design temperature range in accordance with 7.2;
e) operating temperature;
f) coating class and coating thickness class in accordance with 7.2 and 7.3;
g) qualification scheme as defined in 8.1;
h) minimum number of coated pipes to be used for PPT and PQT (if required);
i) cutback configuration and finish (length, angle, visible epoxy, temporary protection, etc.) (see 11.4);
j) type of certificate of compliance (see 16).
6.2 Additional information
The purchase order shall specify which of the following provisions apply for the specific item ordered:
a) pipe tracking and traceability of pipes to coating materials;
b) different requirements for coating materials out of classification systems in accordance with 7.2;
c) repair procedure qualification requirements and permissible number and size of coating repairs, if
different from the one defined in Clause 13;
d) marking of pipes (see 14);
e) handling procedures (see 15.1);
f) storage procedures (see 15.2);
g) documentation and schedule for supply of documentation;
h) purchaser approval of APS/ITP;
i) inspection and testing plan and/or daily log;
j) inspection of incoming pipes;
k) pipe end protection;
l) use of different test methods for soluble salt contamination measurements;
m) minimum thickness of epoxy layer and/or total coating thickness required, if exceeding those in
Table 9 and Table 2, respectively;
n) use of dummy pipe for destructive tests;
o) rough coat application (e.g. prior to concrete weight coating or special laying methods) and
acceptance criteria (see 11.3.5);
p) surface pre-treatment and method to evaluate its effectiveness (see 11.2.4);
q) special requirements relative to supply of coating materials (e.g. FBE or liquid, manufacturer-
specific products and certification);
r) methods, frequency and acceptance criteria for inspection and testing differing from this document;
s) PQT (see 8.1);
8 © ISO 2018 – All rights reserved

ISO 21809-1:2018(E)
t) coating and cutback preservation and protection against adverse ambient conditions during
storage (e.g. UV protection, additional cutback preparation, end-caps) (see 15.2);
u) identification of pipes to be used for PPT (see 8.3).
If further installation processes (e.g. welding processes and field joint coating application) that
envisage the heating of the coated pipe are needed, further testing (e.g. adhesion) may be considered
by the purchaser in order to assess the compatibility of the line pipe coating against the application
parameters of the chosen field joint coating and vice-versa.
7 Coating classification
7.1 General
The coating class shall be selected based on the design temperature range and expected field duty.
The coating thickness class shall be selected based on transport, handling, laying conditions and the
expected operating and environmental conditions.
7.2 Coating classes
The coating shall be capable of withstanding the temperature range required, as shown in Table 1. The
coating class shall be specified in the purchase order.
Table 1 — Coating classes and design temperature ranges
Coating classes B or C can be selected because of higher mechanical properties for project or specific
laying purposes rather than maximum operating temperatures listed in Table 1.
The use of coating classes outside these guidelines is acceptable provided that the applied coating shall
be tested against the requirements specified in Table 7 for each relevant class (i.e. class B shall be tested
against requirements for class B in Table 7, class C shall be tested against requirements for class C in
Table 7).
Different requirements for coating materials outside these classification systems shall be agreed upon
by the applicator and purchaser.
Use of coating classes outside these guide
...