ISO 21809-4
(Main)Oil and gas industries including lower carbon energy — External coatings for buried or submerged pipelines used in pipeline transportation systems — Part 4: Polyethylene coatings (2-layer PE)
Oil and gas industries including lower carbon energy — External coatings for buried or submerged pipelines used in pipeline transportation systems — Part 4: Polyethylene coatings (2-layer PE)
ISO 21809-4:2009 specifies the requirements for qualification, application, inspection, testing, handling and storage of materials for plant application of two-layer polyethylene coatings (2-layer PE) applied externally for the corrosion protection of bare steel pipe for use in pipeline transportation systems for the petroleum and natural gas industries as defined in ISO 13623.
Industries du pétrole et du gaz, y compris les énergies à faible teneur en carbone — Revêtements externes des conduites enterrées ou immergées utilisées dans les systèmes de transport par conduites — Partie 4: Revêtements à base de polyéthylène (PE bicouche)
Le présent document spécifie les exigences relatives à la qualification, à l'application, au contrôle, aux essais, à la manutention et au stockage des matériaux pour l'application en usine des revêtements bicouches à base de polyéthylène (PE bicouche), appliqués extérieurement pour assurer la protection contre la corrosion des tuyaux nus en acier, utilisés dans les systèmes de transport par conduites pour les industries du pétrole et du gaz naturel tels que définis dans l'ISO 13623. NOTE Les tuyaux revêtus conformément au présent document sont considérés comme convenant à une protection supplémentaire par protection cathodique.
General Information
Relations
Standards Content (Sample)
FINAL DRAFT
International
Standard
ISO/FDIS 21809-4
ISO/TC 67/SC 2
Oil and gas industries including
Secretariat: UNI
lower carbon energy — External
Voting begins on:
coatings for buried or submerged
2025-10-17
pipelines used in pipeline
Voting terminates on:
transportation systems —
2025-12-12
Part 4:
Polyethylene coatings (2-layer PE)
Industries du pétrole et du gaz, y compris les énergies à faible
teneur en carbone — Revêtements externes des conduites
enterrées ou immergées utilisées dans les systèmes de transport
par conduites —
Partie 4: Revêtements à base de polyéthylène (PE bicouche)
RECIPIENTS OF THIS DRAFT ARE INVITED TO SUBMIT,
WITH THEIR COMMENTS, NOTIFICATION OF ANY
RELEVANT PATENT RIGHTS OF WHICH THEY ARE AWARE
AND TO PROVIDE SUPPOR TING DOCUMENTATION.
IN ADDITION TO THEIR EVALUATION AS
BEING ACCEPTABLE FOR INDUSTRIAL, TECHNO-
LOGICAL, COMMERCIAL AND USER PURPOSES, DRAFT
INTERNATIONAL STANDARDS MAY ON OCCASION HAVE
TO BE CONSIDERED IN THE LIGHT OF THEIR POTENTIAL
TO BECOME STAN DARDS TO WHICH REFERENCE MAY BE
MADE IN NATIONAL REGULATIONS.
Reference number
ISO/FDIS 21809-4:2025(en) © ISO 2025
FINAL DRAFT
ISO/FDIS 21809-4:2025(en)
International
Standard
ISO/FDIS 21809-4
ISO/TC 67/SC 2
Oil and gas industries including
Secretariat: UNI
lower carbon energy — External
Voting begins on:
coatings for buried or submerged
pipelines used in pipeline
Voting terminates on:
transportation systems —
Part 4:
Polyethylene coatings (2-layer PE)
Industries du pétrole et du gaz, y compris les énergies à faible
teneur en carbone — Revêtements externes des conduites
enterrées ou immergées utilisées dans les systèmes de transport
par conduites —
Partie 4: Revêtements à base de polyéthylène (PE bicouche)
RECIPIENTS OF THIS DRAFT ARE INVITED TO SUBMIT,
WITH THEIR COMMENTS, NOTIFICATION OF ANY
RELEVANT PATENT RIGHTS OF WHICH THEY ARE AWARE
AND TO PROVIDE SUPPOR TING DOCUMENTATION.
© ISO 2025
IN ADDITION TO THEIR EVALUATION AS
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
BEING ACCEPTABLE FOR INDUSTRIAL, TECHNO-
LOGICAL, COMMERCIAL AND USER PURPOSES, DRAFT
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on
INTERNATIONAL STANDARDS MAY ON OCCASION HAVE
the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below
TO BE CONSIDERED IN THE LIGHT OF THEIR POTENTIAL
or ISO’s member body in the country of the requester.
TO BECOME STAN DARDS TO WHICH REFERENCE MAY BE
MADE IN NATIONAL REGULATIONS.
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Published in Switzerland Reference number
ISO/FDIS 21809-4:2025(en) © ISO 2025
ii
ISO/FDIS 21809-4:2025(en)
Contents Page
Foreword .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 3
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 Conformity to requirements .8
6 Information supplied by the purchaser . 8
6.1 General information.8
6.2 Additional information.8
7 Coating classification . 9
7.1 General .9
7.2 Coating systems .9
7.3 Coating thickness classes .10
8 Materials . 10
8.1 Pipe .10
8.2 Coating materials .10
8.2.1 Adhesive .10
8.2.2 Polyethylene material .11
8.3 Packaging . 12
8.4 Storage and handling of coating materials . 12
9 Qualification processes .12
9.1 General . 12
9.2 Qualification scheme . 13
9.3 Coating qualification .14
9.3.1 General .14
9.3.2 Repair material . 15
10 Application of coating .16
10.1 General .16
10.2 Surface preparation .16
10.2.1 Initial preparation and surface preparation .16
10.2.2 Abrasive blast cleaning .16
10.2.3 Surface cleanliness and roughness .16
10.2.4 Surface pre-treatment and salt contamination.17
10.2.5 Surface dust contamination .17
10.3 Coating application .17
10.3.1 General .17
10.3.2 Application of adhesive.18
10.3.3 Application of polyethylene .18
10.3.4 Cutback .18
11 Qualification of coating application and coating system .18
11.1 General .18
11.2 Application procedure specification (APS) .18
11.3 Inspection and testing plan (ITP).19
11.4 Procedure qualification trial (PQT) . 20
11.5 Coating system qualification (CSQ) .21
11.6 Pre-production trial (PPT) . 22
11.7 Inspection and testing during production . 23
iii
ISO/FDIS 21809-4:2025(en)
11.8 Inspection and testing . 23
11.8.1 General . 23
11.8.2 Incoming raw materials testing . 25
11.8.3 In-process inspection or measurement by applicator . 25
11.9 Testing of the applied coating . 26
11.9.1 General . 26
11.9.2 Minimum requirements of applied coating and frequency of testing . 26
11.9.3 Retests . 28
11.10 Test results . 28
12 Repair of coated pipe .28
12.1 Repair. 28
12.2 Stripping and recoating . 28
13 Markings .29
13.1 General . 29
13.2 Required markings . 29
14 Handling and storage in the coating area .29
14.1 Handling . 29
14.2 Storage . 29
15 Test reports and inspection certificates .29
15.1 General . 29
15.2 Common requirements for reports . 30
15.3 Specific requirements for test reports .31
15.4 Specific requirements for sampling reports .31
15.5 Reporting statements of conformity .32
15.6 Reporting opinions and interpretations.32
15.7 Amendments to reports .32
Annex A (normative) UV ageing test and thermal ageing test .33
Annex B (normative) Cathodic disbondment test .36
Annex C (normative) Impact test .46
Annex D (normative) Indentation test . .48
Annex E (normative) Flexibility test . .51
Annex F (normative) Peel strength test .53
Annex G (normative) Peel strength test — Hanging mass .57
Annex H (normative) Inspection of thickness .60
Annex I (normative) Holiday detection test .62
Annex J (normative) Lap shear test .64
Annex K (normative) Hot water immersion test . .67
Bibliography .69
iv
ISO/FDIS 21809-4:2025(en)
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 document 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).
ISO draws attention to the possibility that the implementation of this document may involve the use of (a)
patent(s). ISO takes no position concerning the evidence, validity or applicability of any claimed patent
rights in respect thereof. As of the date of publication of this document, ISO had not received notice of (a)
patent(s) which may be required to implement this document. However, implementers are cautioned that
this may not represent the latest information, which may be obtained from the patent database available at
www.iso.org/patents. ISO shall not be held responsible for identifying any or all such patent rights.
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, Oil and gas industries including lower carbon
energy, Subcommittee SC 2, Pipeline transportation systems.
This second edition cancels and replaces the first edition (ISO 21809-4:2009), which has been technically
revised.
The main changes are as follows:
— inclusion of a qualification scheme;
— harmonization with the other parts of the ISO 21809 series;
— changes to Table 8;
— changes to Table 9;
— changes to Annex G.
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.
v
FINAL DRAFT International Standard ISO/FDIS 21809-4:2025(en)
Oil and gas industries including lower carbon energy —
External coatings for buried or submerged pipelines used in
pipeline transportation systems —
Part 4:
Polyethylene coatings (2-layer PE)
1 Scope
This document specifies the requirements for qualification, application, inspection, testing, handling and
storage of materials for plant application of two-layer polyethylene coatings (2-layer PE) applied externally
for the corrosion protection of bare steel pipe for use in pipeline transportation systems for oil and gas
industries as defined in ISO 13623.
NOTE Pipes coated in accordance with this document are considered suitable for additional 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 80000-1, Quantities and units — Part 1: General
ISO 62, Plastics — Determination of water absorption
ISO 306, Plastics — Thermoplastic materials — Determination of Vicat softening temperature (VST)
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 1133, Plastics — Determination of the melt mass-flow rate (MFR) and the melt volume-flow rate (MVR) of
thermoplastics
ISO 17855-2, Plastics — Polyethylene (PE) moulding and extrusion materials — Part 2: Preparation of test
specimens and determination of properties
ISO 1183, Plastics — Methods for determining the density of non-cellular plastics
ISO 4427, Plastics piping systems for water supply and for drainage and sewerage under pressure —
Polyethylene (PE) —
ISO 4437, Plastics piping systems for the supply of gaseous fuels — Polyethylene (PE) —
ISO 4625-1, Binders for paints and varnishes — Determination of softening point — Part 1: Ring-and-ball method
ISO 4892-2, Plastics — Methods of exposure to laboratory light sources — Part 2: Xenon-arc lamps
ISO/FDIS 21809-4:2025(en)
ISO 6964, Polyolefin pipes and fittings — Determination of carbon black content by calcination and pyrolysis —
Test method
ISO 8501-1, 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 8501-3, Preparation of steel substrates before application of paints and related products — Visual
assessment of surface cleanliness — Part 3: Preparation grades of welds, edges and other areas with surface
imperfections
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 water soluble contaminants for analysis (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 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 11125 (all parts), Preparation of steel substrates before application of paints and related products — Test
methods 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 surfaces
ISO 11127 (all parts), Preparation of steel substrates before application of paints and related products — Test
methods for non-metallic blast-cleaning abrasives
ISO 11357-6, Plastics — Differential scanning calorimetry (DSC) — Part 6: Determination of oxidation induction
time (isothermal OIT) and oxidation induction temperature (dynamic OIT)
ISO 15512, Plastics — Determination of water content
ISO 18553, Method for the assessment of the degree of pigment or carbon black dispersion in polyolefin pipes,
fittings and compounds
ISO 19840, Paints and varnishes — Corrosion protection of steel structures by protective paint systems —
Measurement of, and acceptance criteria for, the thickness of dry films on rough surfaces
ASTM D1693, Standard Test Method for Environmental Stress-Cracking of Ethylene Plastics
ASTM D3236, Standard Test Method for Apparent Viscosity of Hot Melt Adhesives and Coating Materials
EN 12201 (all parts), Plastics piping systems for water supply, and for drains and sewers under pressure -
Polyethylene (PE)
EN 10204, Metallic products - Types of inspection documents
ASTM D4285, Standard Test Method for Indicating Oil or Water in Compressed Air
ISO/FDIS 21809-4:2025(en)
ASTM D4940, Standard Test Method for Conductimetric Analysis of Water Soluble Ionic Contamination of
Blasting Abrasives
SSPC-AB 1, Mineral and Slag Abrasives
SSPC-AB 2, Cleanliness of Recycled Ferrous Metallic Abrasives
SSPC-AB 3, Ferrous Metallic Abrasive
SSPC-PA2, Procedure for Determining Conformance to Dry Coating Thickness Requirements
SSPC-SP1, Solvent Cleaning
SSPC Guide 15, Field Methods for Retrieval 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 terminology databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at https:// www .electropedia .org/
3.1
adhesion
bond between coating and substrate (3.32)
3.2
applicator
company that undertakes the coating application
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 considered as the manufacturer (3.15).
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
document provided by the raw material manufacturer (3.15) for a given batch (3.4) that contains results
of specific tests or analysis, including test methodology, performed on a defined lot of the manufacturer’s
product and corresponding conformity ranges for each coating system (3.6) component
3.6
coating system
combination of specified individual coating layers
3.7
coating qualification
CQ
qualification of the coating materials properties carried out by the manufacturer (3.15) before the coating
system qualification (3.8)
ISO/FDIS 21809-4:2025(en)
3.8
coating system qualification
CSQ
qualification of application method, applied coating system (3.6) and subsequent inspection or testing of its
properties, to confirm that the APS (3.3) is adequate to produce a coating with the specified properties
3.9
cutback
length of pipe left uncoated at each end for joining purposes
3.10
design temperature
temperature that can be endured by a pipeline (3.23) (component) during operation, including maximum
and minimum temperatures, likely to be reached during transport, storage, handling, installation, upset
conditions and operation
3.11
end user
company (companies) that own(s) or operate(s) pipeline(s) (3.23)
Note 1 to entry: There can be a combination of ownership and operating.
3.12
holiday
coating discontinuity that exhibits electrical conductivity when exposed to a specific voltage
3.13
inspection certificate
document giving the results of the testing of coated pipes, supplied and signed by a representative of the
applicator (3.2) authorized to issue such documents
Note 1 to entry: The inspection certificate shall be issued in accordance with ISO 10474 or EN 10204.
3.14
inspection and testing plan
ITP
document providing an overview of the sequence of inspections and tests, including appropriate resources
and procedures
3.15
manufacturer
company responsible for the manufacture of coating material(s)
3.16
manufacturer’s specification
document that specifies the characteristics, test requirements and application recommendations for the
coating materials
3.17
maximum service temperature
T
max
maximum continuous temperature that the coating can resist based on information from coating material
manufacturer (3.15)
3.18
minimum service temperature
T
min
minimum continuous temperature that the coating can resist based on information from coating material
manufacturer (3.15)
ISO/FDIS 21809-4:2025(en)
3.19
operating temperature
temperature that can be endured by a pipeline (3.23) (component) during operation, within the range of the
design temperatures (3.10)
3.20
parties
stakeholders with a vested interest in the decision-making
EXAMPLE End user (3.11), purchaser (3.26), applicator (3.2), manufacturer (3.15).
3.21
peel strength
force required for peeling the coating from the substrate (3.32)
3.22
pipe diameter length
length along the pipe axis equal to the specified outside diameter of the pipe
3.23
pipeline
facilities through which fluids are conveyed, including pipe, pig traps, components and appurtenances, up to
and including the isolating valves
3.24
pre-production trial
PPT
application of a coating and subsequent inspection or testing of its properties, to confirm that the coatings
produced in accordance with the APS (3.3) and ITP (3.14) are acceptable within the specified properties,
carried out in the coating plant at a specific coating line, immediately prior to start of production and to
verify that the plant's equipment is adequate to consistently adhere to the APS requirements
3.25
procedure qualification trial
PQT
application of a coating and subsequent inspection or testing of its properties, to confirm that the coatings
produced in accordance with the APS (3.3) and ITP (3.14) are acceptable within the specified properties,
carried out in the coating plant at a specific coating line and to verify that the plant's equipment is adequate
to consistently adhere to the APS requirements
3.26
purchaser
company responsible for providing the purchase order requirements
3.27
record
information created, received and maintained as evidence and as an asset by an organization or person, in
pursuit of legal obligations or in the transaction of business
Note 1 to entry: Maintained information can be in different formats such as on paper and digital.
[SOURCE: ISO 15489-1:2016, 3.14, modified — The term has been changed from "record(s)" to "record"; note
1 to entry has been added.]
3.28
sample
portion of material taken from a batch (3.4) of raw material or coating that represents the properties of the
complete batch
ISO/FDIS 21809-4:2025(en)
3.29
specimen
object prepared for the purpose of testing specific properties
Note 1 to entry: Specimens may be as follows: the coating material; a flat panel or similar prepared specifically for
testing; a coupon, ring or similar that has been cut from a pipe; a pipe that has been coated in production or otherwise,
in laboratory or plant conditions.
3.30
qualification test
process of inspection and evaluation of product or component conformity test performed on a component to
verify the requirements of the manufacturing procedure specification and to demonstrate that components
that meet the specified requirements can be produced
3.31
start up
re-start of coating application activities in case of modification of production parameters or unplanned
stoppage or production interruption exceeding 12 h
3.32
substrate
surface on which a repair is carried out
Note 1 to entry: The surface may belong to original pipework, pipework component, pipeline (3.23), tank or vessel.
3.33
surface cleanliness
level of contamination on a significant surface to be coated such as dust, chloride or other contamination
3.34
test report
document that provides the quantitative test results for tests conducted
3.35
test ring
specimen (3.29) taken from production coated pipe
3.36
dew point
temperature at a specified pressure at which water vapour condensation initiates
3.37
total coating thickness
sum of layers with the exclusion of rough coat, if applicable
4 Symbols and abbreviated terms
4.1 Symbols
d effective sample thickness, expressed in millimetres
D specified outside diameter of the pipe, expressed in millimetres
q initial melt flow rate measured before exposure
MFR0
l distance peeled in millimetres
t peeling time in minutes
t , t , t , t , t , t coating thickness, gauge reading
0 a b c e e
ISO/FDIS 21809-4:2025(en)
T maximum service temperature
max
T minimum service temperature
min
q mean value of the melt flow rates measured after exposure
MFR1
∆q variation of the melt flow rate after exposure
MFR0
R mandrel radius in millimetres
V peeling speed
p
P mass pressure
m
4.2 abbreviated terms
APS application procedure specification
CQ coating qualification
CSQ coating system qualification
DC direct current
ESCR environmental stress cracking resistance
HDPE high density polyethylene
ITP inspection and testing plan
MFR melt flow rate; designated as q for use in mathematical formulae
MFR
PE polyethylene
ppd per pipe diameter
PPT pre-production trial
PQT procedure qualification trial
SAW submerged arc welding
UV ultraviolet
5 General requirements
5.1 Rounding
Unless otherwise stated in this document, to determine conformity to 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.
ISO/FDIS 21809-4:2025(en)
5.2 Conformity to requirements
A quality system and an environmental management system should be applied to assist conformity to the
requirements of this document.
NOTE ISO 9001 provides requirements on a quality management systems and ISO 14001 provides requirements
on the selection and use of an environmental management system.
The applicator shall be responsible for conforming to all of the applicable requirements of this document.
It shall be permissible for the purchaser to make any investigation necessary in order to be assured of
conformity by the applicator and to reject any material or coating that does not conform.
6 Information supplied by the purchaser
6.1 General information
In advance of the purchase order there shall be an agreement between the purchaser and the applicator on
the following items and laid down in the purchase order:
a) the number of this document and year of publication (ISO 21809-4:—);
b) pipe quantity, outside diameter, minimum and nominal wall thickness, minimum, maximum and
nominal length; steel grade;
c) requested schedule of delivery;
d) requested documentation and schedule for supply of documentation;
e) requirements on test reports and (daily) log;
f) type and frequency of inspection certificate;
g) requirements for traceability of coating system, repairs and marking of repairs;
h) bare pipe standard or specification designation, e.g. ISO 3183;
i) coating system classification and thickness;
j) cutback design, length and tolerances for both ends of pipe;
k) additional or deviating tests or requirements in the qualification process or during production; parts in
the qualification or production process are CSQ, CQ, PQT, PPT, production, APS and ITP;
l) entire or partial approval by the purchaser of existing parts of the qualification or production process.
6.2 Additional information
If applicable, there shall be an agreement between the purchaser and the applicator on the following items in
advance of the purchase order and laid down in the purchase order:
a) additional surface treatments if any;
b) plant and process inspection by the purchaser;
c) increased test-ring length;
d) test-ring location;
e) test frequency for additional test rings;
f) additional markings;
g) additional handling procedures;
ISO/FDIS 21809-4:2025(en)
h) additional storage procedures;
i) waiver of test reports;
j) other special requirements;
k) maximum temperature the steel can endure during the coating process if this exceeds 275 °C.
l) minimum and maximum pipeline design or operating temperatures, or both;
m) pipe tracking and traceability of pipes to coating materials;
n) permissible number coating repairs per pipe;
o) additional tests originated from specific installation methods;
p) inspection of incoming pipe;
q) pipe end protection;
r) use of dummy pipe for destructive tests;
s) test temperature for flexibility;
t) request for a PPT.
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. Pertinent information on the application shall be provided by the pipe
coating applicator.
7 Coating classification
7.1 General
The coating shall consist of two layers:
a) 1st layer, composed of one of the following:
1) asphaltic modified rubber;
2) non-asphaltic-modified rubber (e.g. butyl based);
3) hot melt or polymeric;
b) 2nd layer, consisting of the HDPE top layer.
7.2 Coating systems
The coating system shall be classified in accordance with Table 1.
Table 1 — Coating systems
Coating systems A B C
1st layer Asphaltic-modified rubber adhe- non-asphaltic-modified hot melt or polymeric
sive rubber adhesive adhesive
2nd layer HDPE HDPE HDPE
NOTE Temperature resistance of coating systems varies based on the polyethylene and adhesive systems
specified.
ISO/FDIS 21809-4:2025(en)
7.3 Coating thickness classes
The total thickness of the coating and the thicknesses of the individual components shall be in accordance
with Table 2.
Table 2 — Minimum thickness of the total coating and the individual layers
a,b
Coating thickness
mm
Nominal P A B C
m
pipe
kg/m minimum adhesive: minimum adhesive: minimum adhesive:
diameter
0,15 0,2 0,25
mm
minimum minimum minimum minimum minimum minimum
total coat- HDPE total coat- HDPE total coat- HDPE
ing ing ing
< 115 ≤ 15 0,75 0,6 0,95 0,75 1,25 1,0
115 to 275 15 < P ≤ 50 0,85 0,7 1,00 0,8 1,40 1,15
m
276 to 510 50 <
...
ISO/FDIS 21809-4:2025(en)
ISO/TC 67/SC 2
Secretariat: UNI
First edition
2025-07-07
Date:
Oil and gas industries including lower carbon energy — External
coatings for buried or submerged pipelines used in pipeline
transportation systems —
Part 4:
Polyethylene coatings (2-layer PE)
Industries du pétrole et du gaz naturel, y compris les énergies à faible teneur en carbone — Revêtements
externes des conduites enterrées ou immergées utilisées dans les systèmes de transport par conduites —
Partie 4: Revêtements à base de polyéthylène (PE bicouche)
Partie 4: Revêtements à base de polyéthylène (PE bicouche)
FDIS stage
ISO/FDIS 21809-4:2025(en)
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ii
ISO/FDIS 21809-4:2025(en)
Contents Page
Foreword . v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 3
4 Symbols and abbreviated terms . 7
4.1 Symbols . 7
4.2 abbreviated terms . 8
5 General requirements . 8
5.1 Rounding . 8
5.2 Conformity to requirements . 8
6 Information supplied by the purchaser . 9
6.1 General information . 9
6.2 Additional information . 9
7 Coating classification . 10
7.1 General. 10
7.2 Coating systems . 10
7.3 Coating thickness classes . 11
8 Materials . 11
8.1 Pipe . 11
8.2 Coating materials . 12
8.3 Packaging . 13
8.4 Storage and handling of coating materials . 14
9 Qualification processes . 14
9.1 General. 14
9.2 Qualification scheme . 14
9.3 Coating qualification . 17
10 Application of coating. 18
10.1 General. 18
10.2 Surface preparation . 18
10.3 Coating application . 20
11 Qualification of coating application and coating system . 21
11.1 General. 21
11.2 Application procedure specification (APS) . 21
11.3 Inspection and testing plan (ITP) . 22
11.4 Procedure qualification trial (PQT) . 23
11.5 Coating system qualification (CSQ) . 25
11.6 Pre-production trial (PPT) . 26
11.7 Inspection and testing during production . 27
11.8 Inspection and testing . 28
11.9 Testing of the applied coating . 31
11.10 Test results . 34
12 Repair of coated pipe . 34
12.1 Repair . 34
12.2 Stripping and recoating . 34
13 Markings . 34
13.1 General. 34
iii
ISO/FDIS 21809-4:2025(en)
13.2 Required markings . 34
14 Handling and storage in the coating area . 35
14.1 Handling . 35
14.2 Storage . 35
15 Test reports and inspection certificates . 35
15.1 General. 35
15.2 Common requirements for reports . 36
15.3 Specific requirements for test reports . 37
15.4 Specific requirements for sampling reports . 37
15.5 Reporting statements of conformity . 38
15.6 Reporting opinions and interpretations . 38
15.7 Amendments to reports . 39
Annex A (normative) UV ageing test and thermal ageing test . 40
Annex B (normative) Cathodic disbondment test . 43
Annex C (normative) Impact test. 58
Annex D (normative) Indentation test . 60
Annex E (normative) Flexibility test . 63
Annex F (normative) Peel strength test . 66
Annex G (normative) Peel strength test — Hanging mass . 71
Annex H (normative) Inspection of thickness . 75
Annex I (normative) Holiday detection test . 77
Annex J (normative) Lap shear test . 79
Annex K (normative) Hot water immersion test . 83
Bibliography . 85
iv
ISO/FDIS 21809-4:2025(en)
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 document 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).
ISO draws attention to the possibility that the implementation of this document may involve the use of (a)
patent(s). ISO takes no position concerning the evidence, validity or applicability of any claimed patent rights
in respect thereof. As of the date of publication of this document, ISO had not received notice of (a) patent(s)
which may be required to implement this document. However, implementers are cautioned that this may not
represent the latest information, which may be obtained from the patent database available at
www.iso.org/patents. ISO shall not be held responsible for identifying any or all such patent rights.
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, Oil and gas industries including lower carbon
energy, Subcommittee SC 2, Pipeline transportation systems.
This second edition cancels and replaces the first edition (ISO 21809--4:2009), which has been technically
revised.
The main changes are as follows:
— — inclusion of a qualification scheme;
— — harmonization with the other parts of the ISO 21809 series;
— — changes to Table 8Table 7;
— — changes to Table 9Table 8;
— — changes to Annex GAnnex G.
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.
Field Code Changed
v
FINAL DRAFT International Standard ISO/FDIS 21809-4:2025(en)
Oil and gas industries including lower carbon energy — External
coatings for buried or submerged pipelines used in pipeline
transportation systems ——
Part 4:
Polyethylene coatings (2-layer PE)
1 Scope
This document specifies the requirements for qualification, application, inspection, testing, handling and
storage of materials for plant application of two-layer polyethylene coatings (2-layer PE) applied externally
for the corrosion protection of bare steel pipe for use in pipeline transportation systems for oil and gas
industries as defined in ISO 13623.
NOTE Pipes coated in accordance with this document are considered suitable for additional 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 80000--1, Quantities and units — Part 1: General
ISO 62, Plastics — Determination of water absorption
ISO 306, Plastics — Thermoplastic materials — Determination of Vicat softening temperature (VST)
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 1133, Plastics — Determination of the melt mass-flow rate (MFR) and the melt volume-flow rate (MVR) of
thermoplastics
ISO 1872-17855-2, Plastics — Polyethylene (PE) moulding and extrusion materials — Part 2: Preparation of test
specimens and determination of properties
ISO 1183 (all parts),, Plastics — Methods for determining the density of non-cellular plastics
ISO 4427 (all parts),, Plastics piping systems for water supply and for drainage and sewerage under pressure —
Polyethylene (PE) —
ISO/FDIS 21809-4:2025(en)
ISO 4437 (all parts),, Plastics piping systems for the supply of gaseous fuels — Polyethylene (PE) —
ISO 4625--1, Binders for paints and varnishes — Determination of softening point — Part 1: Ring-and-ball
method
ISO 4892--2, 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
ISO 8501--1, 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 8501--3, Preparation of steel substrates before application of paints and related products — Visual
assessment of surface cleanliness -— Part 3: Preparation grades of welds, edges and other areas with surface
imperfections
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 water soluble contaminants for analysis (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 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 11125 (all parts), Preparation of steel substrates before application of paints and related products — Test
methods 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 surfaces
ISO 11127 (all parts), Preparation of steel substrates before application of paints and related products — Test
methods for non-metallic blast-cleaning abrasives
ISO 11357--6, Plastics — Differential scanning calorimetry [(DSC]) — Part 6: Determination of oxidation
induction time (isothermal OIT) and oxidation induction temperature (dynamic OIT)
ISO/FDIS 21809-4:2025(en)
ISO 15512, Plastics — Determination of water content
ISO 15489, Information and documentation - Records management - Part 1: Concepts and principles
ISO 18553, Method for the assessment of the degree of pigment or carbon black dispersion in polyolefin pipes,
fittings and compounds
ISO 19840, Paints and varnishes — Corrosion protection of steel structures by protective paint systems —
Measurement of, and acceptance criteria for, the thickness of dry films on rough surfaces
ASTM D1693, Standard Test Method for Environmental Stress-Cracking of Ethylene Plastics
ASTM D3236, Standard Test Method for Apparent Viscosity of Hot Melt Adhesives and Coating Materials
EN 12201, (all parts), Plastics piping systems for water supply, and for drains and sewers under pressure -
Polyethylene (PE) -
EN 10204, Metallic products - Types of inspection documents
ASTM D4285, Standard Test Method for Indicating Oil or Water in Compressed Air
ASTM D4940, Standard Test Method for Conductimetric Analysis of Water Soluble Ionic Contamination of
Blasting Abrasives
SSPC-AB 1, Mineral and Slag Abrasives
SSPC-AB 2, Cleanliness of Recycled Ferrous Metallic Abrasives
SSPC-AB 3, Ferrous Metallic Abrasive
SSPC-PA2, Procedure for Determining Conformance to Dry Coating Thickness Requirements
SSPC-SP1, Solvent Cleaning
SSPC Guide 15, Field Methods for Retrieval 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 terminology databases for use in standardization at the following addresses:
— — ISO Online browsing platform: available at https://www.iso.org/obp
— — IEC Electropedia: available at https://www.electropedia.org/
—
3.1 3.1
adhesion
bond between coating and substrate (3.32(3.32))
3.2 3.2
applicator
company that undertakes the coating application
ISO/FDIS 21809-4:2025(en)
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 considered as the manufacturer (3.15(3.15).).
3.3 3.3
application procedure specification
APS
document describing procedures, methods, equipment and tools used for coating application
3.4 3.4
batch
quantity of material produced in a continuous manufacturing operation using raw materials of the same
source and grade
3.5 3.5
batch certificate
document provided by the raw material manufacturer (3.15(3.15)) for a given batch (3.4(3.4)) that contains
results of specific tests or analysis, including test methodology, performed on a defined lot of the
manufacturer’s product and corresponding conformity ranges for each coating system (3.6) component
3.6 3.6
coating system
combination of specified individual coating layers
3.7 3.7
coating qualification
CQ
qualification of the coating materials properties carried out by the manufacturer (3.15(3.15)) before the
coating system qualification (3.8(3.8))
3.8 3.8
coating system qualification
CSQ
qualification of application method, applied coating system (3.6(3.6)) and subsequent inspection or testing of
its properties, to confirm that the APS (3.3(3.3)) is adequate to produce a coating with the specified properties
3.9 3.9
cutback
length of pipe left uncoated at each end for joining purposes
3.10 3.10
design temperature
temperature that can be endured by a pipeline (3.23(3.23)) (component) during operation, including
maximum and minimum temperatures, likely to be reached during transport, storage, handling, installation,
upset conditions and operation
3.11 3.11
end user
company (companies) that own(s) or operate(s) pipeline(s) (3.23(3.23) )
Note 1 to entry: There can be a combination of ownership and operating.
3.12 3.12
holiday
coating discontinuity that exhibits electrical conductivity when exposed to a specific voltage
ISO/FDIS 21809-4:2025(en)
3.13 3.13
inspection certificate
document giving the results of the testing of coated pipes, supplied and signed by a representative of the
applicator (3.2(3.2)) authorized to issue such documents
Note 1 to entry: The inspection certificate shall be issued in accordance with ISO 10474 or EN 10204.
3.14 3.14
inspection and testing plan
ITP
document providing an overview of the sequence of inspections and tests, including appropriate resources
and procedures
3.15 3.15
manufacturer
company responsible for the manufacture of coating material(s)
3.16 3.16
manufacturer’s specification
document that specifies the characteristics, test requirements and application recommendations for the
coating materials
3.17 3.17
maximum service temperature of a coating system
T
max
maximum continuous temperature that the coating can resist based on information from coating material
manufacturer (3.15(3.15))
3.18
3.18 minimum service temperature of a coating system
T
min
minimum continuous temperature that the coating can resist based on information from coating material
manufacturer (3.15(3.15))
3.19 3.19
operating temperature
temperature that can be endured by a pipeline (3.23(3.23)) (component) during operation, within the range
of the design temperatures (3.10(3.10))
3.20 3.20
parties
stakeholders with a vested interest in the decision-making
EXAMPLE End user (3.11(3.11),), purchaser (3.26(3.26),), applicator (3.2(3.2),), manufacturer (3.15(3.15).).
3.21 3.21
peel strength
force required for peeling the coating from the substrate (3.32(3.32))
3.22 3.22
pipe diameter length
length along the pipe axis equal to the specified outside diameter of the pipe
ISO/FDIS 21809-4:2025(en)
3.23 3.23
pipeline
facilities through which fluids are conveyed, including pipe, pig traps, components and appurtenances, up to
and including the isolating valves
3.24 3.24
pre-production trial
PPT
application of a coating and subsequent inspection or testing of its properties, to confirm that the coatings
produced in accordance with the APS (3.3(3.3)) and ITP (3.14(3.14)) are acceptable within the specified
properties, carried out in the coating plant at a specific coating line, immediately prior to start of production
and to verify that the plant's equipment is adequate to consistently adhere to the APS requirements
3.25 3.25
procedure qualification trial
PQT
application of a coating and subsequent inspection or testing of its properties, to confirm that the coatings
produced in accordance with the APS (3.3(3.3)) and ITP (3.14(3.14)) are acceptable within the specified
properties, carried out in the coating plant at a specific coating line and to verify that the plant's equipment is
adequate to consistently adhere to the APS requirements
3.26 3.26
purchaser
company responsible for providing the purchase order requirements
3.27 3. 27
record
information created, received, and maintained as evidence and as an asset by an organization or person, in
pursuit of legal obligations or in the transaction of business
[SOURCE: ISO 15489-1:2016, 3.14]
Note 1 to entry: maintaining Maintained information can be in different forms likeformats such as on paper, and digital
etc.
3.28
[SOURCE: ISO 15489-1:2016, 3.14, modified — The term has been changed from "record(s)" to "record"; note
1 to entry has been added.]
3.28
sample
portion of material taken from a batch (3.4(3.4)) of raw material or coating that represents the properties of
the complete batch
3.283.29 3.29
specimen
object prepared for the purpose of testing specific properties
Note 1 to entry: Specimens may be as follows: the coating material; a flat panel or similar prepared specifically for testing;
a coupon, ring or similar that has been cut from a pipe; a pipe that has been coated in production or otherwise, in
laboratory or plant conditions.
ISO/FDIS 21809-4:2025(en)
3.293.30 3.30
qualification test
process of inspection and evaluation of product or component conformity test performed on a component to
verify the requirements of the manufacturing procedure specification and to demonstrate that components
that meet the specified requirements can be produced
3.303.31 3.31
start up
re-start of coating application activities re-start in case of modification of production parameters or unplanned
stoppage or production interruption exceeding 12 h
3.313.32 3.32
substrate
surface on which a repair is carried out
Note 1 to entry: The surface may belong to original pipework, pipework component, pipeline (3.23(3.23),), tank or vessel.
3.323.33 3.33
surface cleanliness
level of contamination on a significant surface to be coated such as dust, chloride or other contamination.
3.333.34 3.34
test report
document that provides the quantitative test results for tests conducted
3.343.35 3.35
test ring
specimen (3.29) taken from production coated pipe
3.353.36 3.36
dew point
temperature at a specified pressure at which water vapour condensation initiates
3.363.37 3.37
total coating thickness
sum of layers with the exclusion of rough coat, if applicable
4 Symbols and abbreviated terms
4.1 Symbols
d effective sample thickness, expressed in millimetres
D specified outside diameter of the pipe, expressed in millimetres
q the initial melt flow rate measured before exposure;
MFR0
l distance peeled in millimetres
t peeling time in minutes
t , t , t , t , t , coating thickness, gauge reading
0,a,b,c,d e 0 a b c
te, te
Tmax maximum service temperature
T minimum service temperature
min
𝑞𝑞¯ the mean value of the melt flow rates measured after exposure.
𝑀𝑀𝑀𝑀𝑀𝑀1
ISO/FDIS 21809-4:2025(en)
∆qMFR0 the variation of the melt flow rate after exposure
R mandrel radius in millimetersmillimetres
V The peeling speed
p
P Massmass pressure
m
4.2 abbreviated terms
APS application procedure specification
CQ coating qualification
CSQ coating system qualification
DC direct current
ESCR environmental stress cracking resistance
HDPE high density polyethylene
ITP inspection and testing plan
MFR melt flow rate; designated as symbol q for use in mathematical expressions and
MFR
equationsformulae
PE polyethylene
ppd per pipe diameter
PPT pre-production trial
PQT procedure qualification trial
SAW submerged arc welding
UV ultraviolet
5 General requirements
5.1 Rounding
Unless otherwise stated in this document, to determine conformity to 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.
5.2 Conformity to requirements
A quality system and an environmental management system should be applied to assist conformity to the
requirements of this document.
NOTE ISO 9001 provides requirements on a quality management systems and ISO 14001 provides requirements on
the selection and use of an environmental management system.
The applicator shall be responsible for conforming to all of the applicable requirements of this document. It
shall be permissible for the purchaser to make any investigation necessary in order to be assured of
conformity by the applicator and to reject any material or coating that does not conform.
ISO/FDIS 21809-4:2025(en)
6 Information supplied by the purchaser
6.1 General information
In advance of the purchase order there shall be an agreement between the purchaser and the applicator on
the following items and laid down in the purchase order:
a) a) the number of this document and year of publication (ISO 21809-4:—);
b) b) pipe quantity, outside diameter, minimum and nominal wall thickness, minimum, maximum
and nominal length; steel grade;
c) c) requested schedule of delivery;
d) d) requested documentation and schedule for supply of documentation;
e) e) requirements on test reports and (daily) log;
f) f) type and frequency of inspection certificate;
g) g) requirements for traceability of coating system, repairs and marking of repairs;
h) i) bare pipe standard or specification designation, e.g. ISO 3183;
i) j) coating system classification and thickness;
j) k) cutback design, length and tolerances for both ends of pipe;
k) l) additional or deviating tests or requirements in the qualification process or during production.
Parts; parts in the qualification or production process are CSQ, CQ, PQT, PPT, production, APS and ITP;
l) m) entire or partial approval by the purchaser of existing parts of the qualification or production process.
6.2 Additional information
If applicable,,, there shall be an agreement between the purchaser and the applicator on the following items in
advance of the purchase order (and shall be reflectedlaid down in the purchase order) on the following items
:
a) a) additional surface treatments if any;
b) b) plant and process inspection by the purchaser;
c) c) increased test-ring length;
d) d) test-ring location;
e) e) test frequency for additional test rings;
f) f) additional markings;
g) g) additional handling procedures;
ISO/FDIS 21809-4:2025(en)
h) h) additional storage procedures;
i) i) waiver of test reports;
j) j) other special requirements;
k) l) maximum temperature the steel can endure during the coating process if this exceeds 275 °C.
l) m) minimum and maximum pipeline design or operating temperatures, or both;
m) n) pipe tracking and traceability of pipes to coating materials;
n) o) permissible number coating repairs per pipe;
o) p) additional tests originated from specific installation methods;
p) q) inspection of incoming pipe;
q) r) pipe end protection;
r) s) use of dummy pipe for destructive tests;
s) t) test temperature for flexibility;
t) u) request for a PPT.
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. Pertinent information on the application toshall be provided by the pipe coating
applicator.
7 Coating classification
7.1 General
The coating shall consist of two layers:
a) a) 1st layer, composed of one of the following:
1) asphaltic modified rubber;
2) non-asphaltic-modified rubber (e.g. butyl based);
3) hot melt or polymeric;
b) b) 2nd layer, consisting of the HDPE top layer.
7.2 Coating systems
The coating system shall be classified in accordance with Table 1Table 1.
ISO/FDIS 21809-4:2025(en)
Table 1 — Coating systems
Coating systems A B C
1st layer Asphaltic-modified rubber non-asphaltic-modified hot melt or polymeric
adhesive rubber adhesive adhesive
2nd layer HDPE HDPE HDPE
NOTE Temperature resistance of coating systems varies based on the polyethylene and adhesive systems specified.
7.3 Coating thickness classes
The total thickness of the coating and the thicknesses of the individual components shall be in accordance with
Table 2Table 2.
Table 2 — Minimum thickness of the total coating and the individual layers
a,b
Coating thickness
mm
Nominal P A B C
m
pipe
kg/m minimum adhesive: minimum adhesive: minimum adhesive:
diameter
0,15 0,2 0,25
mm
minimum minimum minimum minimum minimum minimum
total HDPE total HDPE total HDPE
coating coating coating
< 115 ≤ 15 0,75 0.,6 0,95 0.,75 1,25 1.,0
115 to 275 15 < P ≤ 50 0,85 0.,7 1,00 0.,8 1,40 1.,15
m
276 to 510 50 < P ≤ 130 1,00 0.,85 1,20 1 1,60 1.,35
m
511 to 760 130 < Pm ≤ 300 1,25 1.,1 1,40 1.,2 1,80 1.,55
> 760 Pm > 300 1,35 1.,2 1,75 1.,55 2,00 1.,75
a The total thickness may be reduced by a maximum of 10 % on the weld seam for SAW welded pipes compared to the values in
this table.
b The choice of coating thickness is dependent on the condition of the soil or ground, laying method onshore and offshore, service
constraints and pipe dimensions. These are minimum values and can be changed according to country or project specific
requirements.
c. Pm is Mass Pressure
The applicator shall identify the materials and shall confirm that the certificates comply and relate to the
specified materials.
The applicator and purchaser shall determine the suitability of the system in its environment with respect to
coating system in cooperation with the manufacturer of the coating. When necessary additional measures may
be implemented such as reinforcements within the coating, additional mechanical protection or other suitable
solutions transport, laying of pipe, storage, soil stresses or other factors influencing the performance of the
coating before service.
8 Materials
8.1 Pipe
The pipe being coated shall conform to the pipe standard or specification that is specified in the purchase
order.
ISO/FDIS 21809-4:2025(en)
CAUTION — Pipe conforming to such standards or specifications does not necessarily have a surface
condition that is appropriate for the application of coating, e.g. temporary coating, salt contamination,
slivers.
8.2 Coating materials
8.2.1 Adhesive
Each batch of adhesive shall be tested by the manufacturer in accordance with the requirements of
Table 3Table 3 or Table 4Table 4.
Table 3 — Minimum requirements for adhesive material in systems A and B
Properties Requirements Test method
A B
Viscosity Within 10 % of N/A ASTM D3236
manufacturer’s
specification, expressed in
millipascal-seconds
Specific gravity at 0,9 to 1,2 0,95 to 1,5 The ISO 1183 series
(23+/- ± 3) °C
Melt flow rate N/A Within 10 % of The ISO 1133 series
manufacturer’s
MFR
specification, expressed in
grams per 10 min
Ring and ball softening At least 20 °C above N/A ISO 4625-1
point maximum design
temperature
Table 4 — Minimum requirements for adhesive material in system C
Properties Requirements Requirements Test method
(hot melt) (polymeric)
Viscosity Within 20 % of N/A ASTM D3236
manufacturer’s
specification, expressed in
millipascal-seconds
Water absorption < 0,1 % N/A ISO 62
Ring and ball softening At least 20 °C above N/A ISO 4625-1
point maximum design
temperature
Melt flow rate N/A Within 20 % of The ISO 1133 series
manufacturer’s
MFR
specification, expressed in
grams per 10 min
Moisture content N/A < 0,1 % ISO 15512
Vicat softening N/A W 85 °C ISO 306
temperature A/50 (9,8 N)
ISO/FDIS 21809-4:2025(en)
8.2.2 Polyethylene material
8.2.2.1 General
The applicator shall use high density polyethylene material that is in accordance with Table 5Table 5.
Table 5 — Minimum requirements for polyethylene top layer
Properties Requirements Test method
a 3
Density of base resin > 0,930 g/cm The ISO 1183 series
Melt flow rate at 190 °C: 2,16 kg Within 20 % of manufacturer’s The ISO 1133 series
specification
MFR
Elongation at break at 23 °C: ±3 °C > 600 % ISO 527-2, ISO 527-3
b
Tensile yield strength at 23 °C: ±3 °C > 15 MPa ISO 527-2, ISO 527-3
Vicat softening temperature A/50 > 95 °C ISO 306
(9,8 N)
Water absorption < 0,05 % ISO 62
Hardness shore D >55 ISO 868
ESCR (50 °C, F50, > 300 h ASTM D 1693
Cond. B, 100 % Igepal CO 630)
Oxidation induction time > 30 min at 210 °C, or ISO 11357-6
c
(intercept in the tangent method) > 10 min at 220 °C
UV resistance and thermal ageing, ΔqMFR ≤ 35 % Annex AAnnex A
2 400 h
Carbon black content in the range of 2 % to 3 % ISO 6964
Carbon black dispersion max. grade 3 ISO 18553
a
The test specimen shall be a compression-moulded or injection-moulded sheet annealed for 30 min at 100 °C.
b
The test specimen shall be a 2 mm thick compression-moulded or injection-moulded sheet prepared in accordance
with ISO 527-2, strained at 50 mm/min. The specimen may also be prepared according to ISO 187217855-2.
c
Manufacturer shall select one test condition only.
The carbon black used in the production of black compound shall be P type according toin accordance with
the ISO 4427, series, the ISO 4437 series or the EN 12201 series for its superior UV protection, Low Compound
Moisture Absorptionlow compound moisture absorption (CMA) and high purity with extremely low levels of
impurities level.
8.2.2.2 Compounding during processing
The polyethylene shall be compounded and stabilized by additives against UV and thermal ageing.
If the compounding is done by the applicator during the coating process, the applicator shall qualify the
process, and conduct all the relevant tests in accordance with the requirements of this document.
8.3 Packaging
The coating materials shall be contained in packaging that is clearly labelled to identify the items specified in
9.39.3.
ISO/FDIS 21809-4:2025(en)
For bulk shipments, where the container is not specifically marked for that product (e.g. railcars), the
manufacturer shall provide documentation to ensure traceability in accordance with the requirements of this
clause. The manufacturer's specification for adhesive and PE materials shall include the following:
— — trade name;
— — description of the adhesive (if applicable);
— — colour;
— — maximum and minimum storage temperatures, expressed in degrees Celsius;
— — shelf-life at storage temperature, expressed in months;
— — physical properties, in accordance with Tables 3Tables 3, 4, 4 and 55.
8.4 Storage and handling of coating materials
Storage and handling of coating materials shall be in accordance with the manufacturer's specification.
9 Qualification processes
9.1 General
The purchaser is either the end user or the representative of the end user.
The qualification scheme shall be performed per coating line, coating materialmaterials and application
procedureprocedures; and in case of modifications to the coating line, coating materials or application
procedures, qualification shall be repeated.
The applicator shall carry out and report the coating system qualification in accordance with the requirements
of this document. The test report shall contain the results of the qualification tests and data required in
Tables 1, 2, 3Tables 1, 2, 3, 4, 4 and 55,, where applicable.
9.2 Qualification scheme
The qualification process in accordance with this document includes the following qualification steps:
a) a) Coating qualification (CQ), by the manufacturer (9.3(9.3).).
Each coating material shall be qualified by the manufacturer in accordance with the requirements of
Ta
...
PROJET FINAL
Norme
internationale
ISO/FDIS 21809-4
ISO/TC 67/SC 2
Industries du pétrole et du gaz,
Secrétariat: UNI
y compris les énergies à faible
Début de vote:
teneur en carbone — Revêtements
2025-10-17
externes des conduites enterrées
Vote clos le:
ou immergées utilisées dans
2025-12-12
les systèmes de transport par
conduites —
Partie 4:
Revêtements à base de polyéthylène
(PE bicouche)
Oil and gas industries including lower carbon energy — External
coatings for buried or submerged pipelines used in pipeline
transportation systems —
Part 4: Polyethylene coatings (2-layer PE)
LES DESTINATAIRES DU PRÉSENT PROJET SONT
INVITÉS À PRÉSENTER, AVEC LEURS OBSERVATIONS,
NOTIFICATION DES DROITS DE PROPRIÉTÉ DONT ILS
AURAIENT ÉVENTUELLEMENT CONNAISSANCE ET À
FOURNIR UNE DOCUMENTATION EXPLICATIVE.
OUTRE LE FAIT D’ÊTRE EXAMINÉS POUR
ÉTABLIR S’ILS SONT ACCEPTABLES À DES FINS
INDUSTRIELLES, TECHNOLOGIQUES ET COM-MERCIALES,
AINSI QUE DU POINT DE VUE DES UTILISATEURS, LES
PROJETS DE NORMES
INTERNATIONALES DOIVENT PARFOIS ÊTRE CONSIDÉRÉS
DU POINT DE VUE DE LEUR POSSI BILITÉ DE DEVENIR DES
NORMES POUVANT
SERVIR DE RÉFÉRENCE DANS LA RÉGLEMENTATION
NATIONALE.
Numéro de référence
ISO/FDIS 21809-4:2025(fr) © ISO 2025
PROJET FINAL
ISO/FDIS 21809-4:2025(fr)
Norme
internationale
ISO/FDIS 21809-4
ISO/TC 67/SC 2
Industries du pétrole et du gaz,
Secrétariat: UNI
y compris les énergies à faible
Début de vote:
teneur en carbone — Revêtements
2025-10-17
externes des conduites enterrées
Vote clos le:
ou immergées utilisées dans
2025-12-12
les systèmes de transport par
conduites —
Partie 4:
Revêtements à base de polyéthylène
(PE bicouche)
Oil and gas industries including lower carbon energy — External
coatings for buried or submerged pipelines used in pipeline
transportation systems —
Part 4: Polyethylene coatings (2-layer PE)
LES DESTINATAIRES DU PRÉSENT PROJET SONT
INVITÉS À PRÉSENTER, AVEC LEURS OBSERVATIONS,
NOTIFICATION DES DROITS DE PROPRIÉTÉ DONT ILS
AURAIENT ÉVENTUELLEMENT CONNAISSANCE ET À
FOURNIR UNE DOCUMENTATION EXPLICATIVE.
DOCUMENT PROTÉGÉ PAR COPYRIGHT
OUTRE LE FAIT D’ÊTRE EXAMINÉS POUR
ÉTABLIR S’ILS SONT ACCEPTABLES À DES FINS
© ISO 2025 INDUSTRIELLES, TECHNOLOGIQUES ET COM-MERCIALES,
AINSI QUE DU POINT DE VUE DES UTILISATEURS, LES
Tous droits réservés. Sauf prescription différente ou nécessité dans le contexte de sa mise en œuvre, aucune partie de cette
PROJETS DE NORMES
INTERNATIONALES DOIVENT PARFOIS ÊTRE CONSIDÉRÉS
publication ne peut être reproduite ni utilisée sous quelque forme que ce soit et par aucun procédé, électronique ou mécanique,
DU POINT DE VUE DE LEUR POSSI BILITÉ DE DEVENIR DES
y compris la photocopie, ou la diffusion sur l’internet ou sur un intranet, sans autorisation écrite préalable. Une autorisation peut
NORMES POUVANT
être demandée à l’ISO à l’adresse ci-après ou au comité membre de l’ISO dans le pays du demandeur.
SERVIR DE RÉFÉRENCE DANS LA RÉGLEMENTATION
NATIONALE.
ISO copyright office
Case postale 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Genève
Tél.: +41 22 749 01 11
E-mail: copyright@iso.org
Web: www.iso.org
Publié en Suisse Numéro de référence
ISO/FDIS 21809-4:2025(fr) © ISO 2025
ii
ISO/FDIS 21809-4:2025(fr)
Sommaire Page
Avant-propos .v
1 Domaine d'application . 1
2 Références normatives . 1
3 Termes et définitions . 3
4 Symboles et termes abrégés . 7
4.1 Symboles .7
4.2 Abréviations.7
5 Exigences générales . . 8
5.1 Arrondis.8
5.2 Conformité aux exigences .8
6 Informations à fournir par l'acheteur . 8
6.1 Informations générales .8
6.2 Informations complémentaires .9
7 Classification des revêtements . 10
7.1 Généralités .10
7.2 Systèmes de revêtement .10
7.3 Classes d'épaisseur de revêtement .10
8 Matériaux .11
8.1 Tuyau .11
8.2 Matériaux de revêtement .11
8.2.1 Adhésif .11
8.2.2 Matériau en polyéthylène . 12
8.3 Emballage . 13
8.4 Stockage et manutention des matériaux de revêtement . 13
9 Processus de qualification .13
9.1 Généralités . 13
9.2 Programme de qualification. 13
9.3 Qualification du revêtement . 15
9.3.1 Généralités . 15
9.3.2 Matériaux de réparation .16
10 Application du revêtement . 17
10.1 Généralités .17
10.2 Préparation de surface .17
10.2.1 Préparation initiale et préparation de la surface .17
10.2.2 Décapage par projection d'abrasif .17
10.2.3 Propreté et rugosité de surface . .17
10.2.4 Prétraitement de surface et contamination saline .18
10.2.5 Contamination de la surface par la poussière .18
10.3 Application du revêtement.19
10.3.1 Généralités .19
10.3.2 Application de l'adhésif . .19
10.3.3 Application du polyéthylène .19
10.3.4 Longueur non revêtue en extrémité .19
11 Qualification de l'application du revêtement et du système de revêtement .20
11.1 Généralités . 20
11.2 Spécification du mode opératoire d'application (APS) . 20
11.3 plan de contrôles et d'essais (ITP) .21
11.4 Essai de qualification du mode opératoire (PQT) .21
11.5 Qualification du système de revêtement (CSQ) . 22
11.6 Essai de pré-production (PPT) . 23
11.7 Inspection et essais pendant la production .24
iii
ISO/FDIS 21809-4:2025(fr)
11.8 Contrôles et essais . 25
11.8.1 Généralités . 25
11.8.2 Essais des matières premières entrantes . 26
11.8.3 Contrôle ou mesurage par l'applicateur en cours de procédé . 26
11.9 Essais du revêtement appliqué . .27
11.9.1 Généralités .27
11.9.2 Exigences minimales relatives au revêtement appliqué et à la fréquence des
essais .27
11.9.3 Nouveaux essais . 29
11.10 Résultats d'essai . 30
12 Réparation des tuyaux revêtus .30
12.1 Réparation . 30
12.2 Dégarnissage et nouveau revêtement . 30
13 Marquages.31
13.1 Généralités .31
13.2 Marquages exigés .31
14 Manutention et stockage dans la zone de revêtement .31
14.1 Manutention .31
14.2 Stockage .31
15 Rapports d'essai et certificats de réception .31
15.1 Généralités .31
15.2 Exigences communes pour les rapports .32
15.3 Exigences spécifiques pour les rapports d'essai . 33
15.4 Exigences spécifiques pour les rapports d'échantillonnage . 33
15.5 Rapport sur les déclarations de conformité . 34
15.6 Rapport sur les avis et interprétations . . 34
15.7 Amendements aux rapports . 34
Annexe A (normative) Essai de vieillissement aux UV et essai de vieillissement thermique .35
Annexe B (normative) Essai de décollement cathodique .38
Annexe C (normative) Essai d'impact .48
Annexe D (normative) Essai d'indentation .50
Annexe E (normative) Essai de flexibilité .53
Annexe F (normative) Essai de résistance au pelage .55
Annexe G (normative) Essai de résistance au pelage — Masse suspendue .59
Annexe H (normative) Contrôle de l'épaisseur.62
Annexe I (normative) Essai de détection des lacunes .64
Annexe J (normative) Essai de cisaillement du recouvrement.66
Annexe K (normative) Essai d'immersion dans l'eau chaude .69
Bibliographie .71
iv
ISO/FDIS 21809-4:2025(fr)
Avant-propos
L'ISO (Organisation internationale de normalisation) est une fédération mondiale d'organismes nationaux
de normalisation (comités membres de l'ISO). L'élaboration des Normes internationales est en général
confiée aux comités techniques de l'ISO. Chaque comité membre intéressé par une étude a le droit de faire
partie du comité technique créé à cet effet. Les organisations internationales, gouvernementales et non
gouvernementales, en liaison avec l'ISO, participent également aux travaux. L'ISO collabore étroitement avec
la Commission électrotechnique internationale (IEC) en ce qui concerne la normalisation électrotechnique.
Les procédures utilisées pour élaborer le présent document et celles destinées à sa mise à jour sont
décrites dans les Directives ISO/IEC, Partie 1. Il convient, en particulier, de prendre note des différents
critères d'approbation requis pour les différents types de documents ISO. Le présent document
a été rédigé conformément aux règles de rédaction données dans les Directives ISO/IEC, Partie 2
(voir www.iso.org/directives).
L'ISO attire l'attention sur le fait que la mise en application du présent document peut entraîner l'utilisation
d'un ou de plusieurs brevets. L'ISO ne prend pas position quant à la preuve, à la validité et à l'applicabilité de
tout droit de propriété revendiqué à cet égard. À la date de publication du présent document, l'ISO n'avait pas
reçu notification qu'un ou plusieurs brevets pouvaient être nécessaires à sa mise en application. Toutefois,
il y a lieu d'avertir les responsables de la mise en application du présent document que des informations
plus récentes sont susceptibles de figurer dans la base de données de brevets, disponible à l'adresse
www.iso.org/brevets. L'ISO ne saurait être tenue pour responsable de ne pas avoir identifié de tels droits de
propriété et averti de leur existence.
Les appellations commerciales éventuellement mentionnées dans le présent document sont données pour
information, par souci de commodité, à l'intention des utilisateurs et ne sauraient constituer un engagement.
Pour une explication de la nature volontaire des normes, la signification des termes et expressions
spécifiques de l'ISO liés à l'évaluation de la conformité, ou pour toute information au sujet de l'adhésion de
l'ISO aux principes de l'Organisation mondiale du commerce (OMC) concernant les obstacles techniques au
commerce (OTC), voir www.iso.org/avant-propos.
Le présent document a été élaboré par le comité technique ISO/TC 67, Industries du pétrole et du gaz, y
compris les énergies à faible teneur en carbone, sous-comité SC 2, Systèmes de transport par conduites.
Cette deuxième édition annule et remplace la première édition (ISO 21809-4:2009), qui a fait l'objet d'une
révision technique.
Les principales modifications sont les suivantes:
— ajout d'un programme de qualification;
— harmonisation avec les autres parties de la série ISO 21809;
— modifications au Tableau 8;
— modifications au Tableau 9;
— modifications à l'Annexe G.
Une liste de toutes les parties de la série ISO 21809 se trouve sur le site web de l'ISO.
Il convient que l'utilisateur adresse tout retour d'information ou toute question concernant le présent
document à l'organisme national de normalisation de son pays. Une liste exhaustive desdits organismes se
trouve à l'adresse www.iso.org/fr/members.html.
v
PROJET FINAL Norme internationale ISO/FDIS 21809-4:2025(fr)
Industries du pétrole et du gaz, y compris les énergies à faible
teneur en carbone — Revêtements externes des conduites
enterrées ou immergées utilisées dans les systèmes de
transport par conduites —
Partie 4:
Revêtements à base de polyéthylène (PE bicouche)
1 Domaine d'application
Le présent document spécifie les exigences relatives à la qualification, à l'application, au contrôle, aux essais,
à la manutention et au stockage des matériaux pour l'application en usine des revêtements bicouches à base
de polyéthylène (PE bicouche), appliqués extérieurement pour assurer la protection contre la corrosion des
tuyaux nus en acier, utilisés dans les systèmes de transport par conduites pour les industries du pétrole et
du gaz comme cela est défini dans l'ISO 13623.
NOTE Les tuyaux revêtus conformément au présent document sont considérés comme convenant à une protection
supplémentaire par protection cathodique.
2 Références normatives
Les documents suivants sont cités dans le texte de sorte qu'ils constituent, pour tout ou partie de leur
contenu, des exigences du présent document. Pour les références datées, seule l'édition citée s'applique. Pour
les références non datées, la dernière édition du document de référence s'applique (y compris les éventuels
amendements).
ISO 80000-1, Grandeurs et unités — Partie 1: Généralités
ISO 62, Plastiques — Détermination de l'absorption d'eau
ISO 306, Plastiques — Matières thermoplastiques — Détermination de la température de ramollissement Vicat (VST)
ISO 527-2, Plastiques — Détermination des propriétés en traction — Partie 2: Conditions d'essai des plastiques
pour moulage et extrusion
ISO 527-3, Plastiques — Détermination des propriétés en traction — Partie 3: Conditions d'essai pour films et
feuilles
ISO 868, Plastiques et ébonite — Détermination de la dureté par pénétration au moyen d'un duromètre
(dureté Shore)
ISO 1133, Plastiques — Détermination de l’indice de fluidité à chaud des thermoplastiques, en masse (MFR) et en
volume (MVR)
ISO 17855-2, Plastiques — Matériaux à base de polyéthylène (PE) pour moulage et extrusion — Partie 2:
Préparation des éprouvettes et détermination des propriétés
ISO 1183, Plastiques — Méthodes de détermination de la masse volumique des plastiques non alvéolaires
ISO 4427, Systèmes de canalisations en plastique destinés à l’alimentation en eau et aux branchements et
collecteurs d’assainissement sous pression — Polyéthylène (PE)
ISO/FDIS 21809-4:2025(fr)
ISO 4437, Systèmes de canalisations en plastique pour la distribution de combustibles gazeux — Polyéthylène (PE)
ISO 4625-1, Liants pour peintures et vernis — Détermination du point de ramollissement — Partie 1: Méthode
de l'anneau et de la bille
ISO 4892-2, Plastiques — Méthodes d'exposition à des sources lumineuses de laboratoire — Partie 2: Lampes à
arc au xénon
ISO 6964, Tubes et raccords en polyoléfines — Détermination de la teneur en noir de carbone par calcination et
pyrolyse — Méthode d’essai
ISO 8501-1, Préparation des subjectiles d’acier avant application de peintures et de produits assimilés —
Évaluation visuelle de la propreté d’un subjectile — Partie 1: Degrés de rouille et degrés de préparation des
subjectiles d’acier non recouverts et des subjectiles d’acier après décapage sur toute la surface des revêtements
précédents
ISO 8501-3, Préparation des subjectiles d'acier avant application de peintures et de produits assimilés —
Évaluation visuelle de la propreté de surface — Partie 3: Degrés de préparation des soudures, arêtes et autres
zones représentant des imperfections du subjectile
ISO 8502-3, Préparation des subjectiles d'acier avant application de peintures et de produits assimilés — Essais
pour apprécier la propreté d'une surface — Partie 3: Évaluation de la poussière sur les surfaces d'acier préparées
pour la mise en peinture (méthode du ruban adhésif sensible à la pression)
ISO 8502-6, Préparation des subjectiles d'acier avant application de peintures et de produits assimilés — Essais
pour apprécier la propreté d'une surface — Partie 6: Extraction des contaminants solubles en vue de l'analyse
(Méthode de Bresle)
ISO 8502-9, Préparation des subjectiles d'acier avant application de peintures et de produits assimilés — Essais
pour apprécier la propreté d'une surface — Partie 9: Méthode in situ pour la détermination des sels solubles dans
l'eau par conductimétrie
ISO 8503-4, Préparation des subjectiles d'acier avant application de peintures et de produits assimilés —
Caractéristiques de rugosité des subjectiles d'acier décapés — Partie 4: Méthode d'étalonnage des comparateurs
viso-tactiles ISO et de classification d'un profil de surface — Utilisation d'un appareil à palpeur
ISO 8503-5, Préparation des subjectiles d'acier avant application de peintures et de produits assimilés —
Caractéristiques de rugosité des subjectiles d'acier décapés — Partie 5: Méthode de l'empreinte sur ruban adhésif
pour la détermination du profil de surface
ISO 10474, Aciers et produits sidérurgiques — Documents de contrôle
ISO 11124 (toutes les parties), Préparation des subjectiles d’acier avant application de peintures et de produits
assimilés — Spécifications pour abrasifs métalliques destinés à la préparation par projection
ISO 11125 (toutes les parties), Préparation des subjectiles d’acier avant application de peintures et de produits
assimilés — Méthodes d’essai pour abrasifs métalliques destinés à la préparation par projection
ISO 11126 (toutes les parties), Préparation des subjectiles d’acier avant application de peintures et de produits
assimilés — Spécifications pour abrasifs non métalliques destinés à la préparation par projection
ISO 11127 (toutes les parties), Préparation des subjectiles d’acier avant application de peintures et de produits
assimilés — Méthodes d’essai pour abrasifs non métalliques destinés à la préparation par projection
ISO 11357-6, Plastiques — Analyse calorimétrique différentielle (DSC) — Partie 6: Détermination du temps
d'induction à l'oxydation (OIT isotherme) et de la température d'induction à l'oxydation (OIT dynamique)
ISO 15512, Plastiques — Dosage de l'eau
ISO 18553, Méthode d'estimation de la dispersion du pigment et du noir de carbone dans les tubes, raccords et
compositions à base de polyoléfines
ISO/FDIS 21809-4:2025(fr)
ISO 19840, Peintures et vernis — Anticorrosion des structures en acier par systèmes de peinture — Mesure et
critères d'acceptation de l'épaisseur d'un feuil sec sur des surfaces rugueuses
ASTM D1693, Standard Test Method for Environmental Stress-Cracking of Ethylene Plastics
ASTM D3236, Standard Test Method for Apparent Viscosity of Hot Melt Adhesives and Coating Materials
EN 12201 (toutes les parties), Systèmes de canalisations en plastique pour l’alimentation en eau et pour les
branchements et les collecteurs d’assainissement avec pression — Polyéthylène (PE)
EN 10204, Produits métalliques — Types de documents de contrôle
ASTM D4285, Standard Test Method for Indicating Oil or Water in Compressed Air
ASTM D4940, Standard Test Method for Conductimetric Analysis of Water Soluble Ionic Contamination of
Blasting Abrasives
SSPC-AB 1, Mineral and Slag Abrasives
SSPC-AB 2, Cleanliness of Recycled Ferrous Metallic Abrasives
SSPC-AB 3, Ferrous Metallic Abrasive
SSPC-PA2, Procedure for Determining Conformance to Dry Coating Thickness Requirements
SSPC-SP1, Solvent Cleaning
SSPC Guide 15, Field Methods for Retrieval and Analysis of Soluble Salts on Steel and Other Nonporous Substrates
3 Termes et définitions
Pour les besoins du présent document, les termes et définitions suivants s'appliquent.
L'ISO et l'IEC tiennent à jour des bases de données terminologiques destinées à être utilisées en normalisation,
consultables aux adresses suivantes:
— ISO Online browsing platform: disponible à l'adresse https:// www .iso .org/ obp
— IEC Electropedia: disponible à l'adresse https:// www .electropedia .org/
3.1
adhérence
liaison entre le revêtement et le substrat (3.32)
3.2
applicateur
entreprise qui réalise l'application du revêtement
Note 1 à l'article: Si la formulation de la couche supérieure est réalisée avant ou pendant le processus d'application par
l'applicateur, alors celui-ci est considéré comme étant le fabricant (3.15).
3.3
spécification du mode opératoire d'application
APS (Application Procedure Specification)
document décrivant les procédures, les méthodes, l'équipement et les outils à utiliser pour l'application du
revêtement
3.4
lot
quantité de matériau produite lors d'une séquence continue de fabrication en utilisant des matières
premières de la même origine et de la même qualité
ISO/FDIS 21809-4:2025(fr)
3.5
certificat de lot
document fourni par le fabricant (3.15) de matières premières pour un lot (3.4) donné contenant les résultats
d'essais ou d'analyses spécifiques, y compris la méthodologie d'essai, réalisés sur un lot défini du produit du
fabricant et les plages de conformité correspondantes pour chaque composant du système de revêtement (3.6)
3.6
système de revêtement
combinaison de couches de revêtement individuelles spécifiées
3.7
qualification du revêtement
CQ
qualification des caractéristiques des matériaux de revêtement effectuée par le fabricant (3.15)
préalablement à la qualification du système de revêtement (3.8)
3.8
qualification du système de revêtement
CSQ
qualification de la méthode d'application, du système de revêtement (3.6) appliqué et contrôle ou essais
ultérieurs de ses caractéristiques, pour confirmer que l'APS (3.3) est adaptée pour produire un revêtement
présentant les caractéristiques spécifiées
3.9
longueur non revêtue en extrémité
longueur de tuyau laissée sans revêtement à chaque extrémité à des fins d'assemblage
3.10
température de calcul
température qui peut être supportée par une conduite (3.23) (composant) en service, y compris les
températures maximale et minimale, susceptible d'être atteinte pendant le transport, le stockage, la
manutention, l'installation, les conditions de perturbation et l'exploitation
3.11
utilisateur final
entreprise(s) possédant ou exploitant le système de conduites (3.23)
Note 1 à l'article: Il peut y avoir une combinaison de propriété et d'exploitation.
3.12
lacune
discontinuité du revêtement qui présente une conductivité électrique lorsqu'elle est soumise à une
tension donnée
3.13
certificat de réception
document donnant les résultats d'essai des tuyaux revêtus, fourni et signé par un représentant de
l'applicateur (3.2) autorisé à émettre de tels documents
Note 1 à l'article: Le certificat de réception doit être conforme à l'ISO 10474 ou l'EN 10204.
3.14
plan de contrôles et d'essais
ITP (Inspection and Testing Plan)
document fournissant une vue d'ensemble de la séquence des contrôles et essais, y compris les ressources et
procédures appropriées
3.15
fabricant
entreprise ayant la responsabilité de la fabrication du ou des matériaux de revêtement
ISO/FDIS 21809-4:2025(fr)
3.16
spécification du fabricant
document spécifiant les caractéristiques, les exigences d'essai et les recommandations d'application des
matériaux de revêtement
3.17
température maximale de service
T
max
température maximale continue à laquelle le revêtement peut résister, sur la base des informations fournies
par le fabricant (3.15) du matériau de revêtement
3.18
température minimale de service
T
min
température minimale continue à laquelle le revêtement peut résister, sur la base des informations fournies
par le fabricant (3.15) du matériau de revêtement
3.19
température de service
température qui peut être supportée par une conduite (3.23) (composant) en service, dans la gamme de
températures de calcul (3.10)
3.20
parties
parties prenantes ayant un intérêt direct dans la prise de décision
EXEMPLE Utilisateur final (3.11), acheteur (3.26), applicateur (3.2), fabricant (3.15).
3.21
résistance au pelage
force exigée pour peler le revêtement du substrat (3.32)
3.22
longueur d'un diamètre de tuyau
longueur dans l'axe du tuyau égale au diamètre extérieur spécifié du tuyau
3.23
conduite
installation dans laquelle sont transportés les fluides, comprenant tuyaux, gares de racleurs, composants,
accessoires et vannes d'isolement
3.24
essai de pré-production
PPT
application d'un revêtement et contrôle ou essais ultérieurs de ses caractéristiques pour confirmer que
les revêtements produits conformément à l'APS (3.3) et à l'ITP (3.14) sont acceptables dans le respect des
caractéristiques spécifiées, réalisés dans l'usine de revêtement sur une ligne de revêtement spécifique,
immédiatement avant le début de la production et pour vérifier que les équipements de l'usine sont adéquats
pour satisfaire de façon constante les exigences de l'APS
3.25
essai de qualification du mode opératoire
PQT
application d'un revêtement et contrôle ou essais ultérieurs de ses caractéristiques pour confirmer que
les revêtements produits conformément à l'APS (3.3) et à l'ITP (3.14) sont acceptables dans le respect des
caractéristiques spécifiées, réalisés dans l'usine de revêtement sur une ligne de revêtement spécifique, et
pour vérifier que les équipements de l'usine sont adéquats pour satisfaire de façon constante les exigences
de l'APS
ISO/FDIS 21809-4:2025(fr)
3.26
acheteur
entreprise responsable de la spécification des exigences de la commande
3.27
enregistrement
information créée, reçue et conservée comme preuve et comme actif par une organisation ou une personne,
dans le cadre de l'exécution d'obligations légales ou de transactions commerciales
Note 1 à l'article: Les informations conservées peuvent être disponibles dans différents formats, par exemple sur
papier ou en format numérique.
[SOURCE: ISO 15489-1:2016, 3.14, modifié – Le terme «enregistrement(s)» a été remplacé par
«enregistrement»; la Note 1 à l'article a été ajoutée.]
3.28
échantillon
portion de matériau prélevée sur un lot (3.4) de matière première ou de revêtement qui représente les
caractéristiques du lot complet
3.29
éprouvette
objet préparé pour les besoins des essais de caractéristiques spécifiques
Note 1 à l'article: Les éprouvettes peuvent avoir les formes suivantes: le matériau de revêtement; panneau plat ou
similaire préparé spécifiquement pour des essais; un coupon, anneau ou similaire qui a été découpé à partir d'un
tuyau; un tuyau qui a été revêtu en production ou autrement, dans des conditions de laboratoire ou d'usine.
3.30
essai de qualification
processus de contrôle et d'évaluation de l'essai de conformité du produit ou du composant effectué sur
un composant pour vérifier les exigences de la spécification du mode opératoire de fabrication et pour
démontrer que les composants qui satisfont aux exigences spécifiées peuvent être produits
3.31
reprise
redémarrage de l'application du revêtement en cas de modification des paramètres de production, d'arrêt
non planifié ou d'interruption de la production au-delà de 12 h
3.32
substrat
surface sur laquelle une réparation est effectuée
Note 1 à l'article: La surface peut faire partie d'une tuyauterie d'origine, d'un composant de tuyauterie, d'une conduite
(3.23) de transport, d'un réservoir ou d'un appareil à pression.
3.33
propreté d'une surface
niveau de contamination d'une surface importante à revêtir, telle que la poussière, le chlorure ou toute autre
contamination
3.34
rapport d'essai
document donnant les résultats d'essai quantitatifs pour les essais conduits
3.35
anneau d'essai
éprouvette (3.29) prélevée dans un tuyau de production revêtu
3.36
point de rosée
température à laquelle la vapeur d'eau commence à condenser à une pression spécifiée
ISO/FDIS 21809-4:2025(fr)
3.37
épaisseur totale de revêtement
somme des couches à l'exclusion d'un revêtement rugueux, le cas échéant
4 Symboles et termes abrégés
4.1 Symboles
d épaisseur effective de l'échantillon, exprimée en millimètres
D diamètre extérieur spécifié du tuyau, exprimé en millimètres
q indice de fluidité à chaud initial mesuré avant exposition
MFR0
l distance pelée, en millimètres
t temps de pelage, en minutes
t , t , t , t , t , t épaisseur de revêtement, lecture de la jauge
0 a b c e e
T température maximale de service
max
T température minimale de service
min
q
valeur moyenne des indices de fluidité à chaud mesurés après exposition
MFR1
∆q variation de l'indice de fluidité à chaud après exposition
MFR0
R rayon du mandrin, en millimètres
V vitesse de pelage
p
P pression de masse
m
4.2 Abréviations
APS spécification du mode opératoire d'application (application procedure specification)
CQ qualification du revêtement (coating qualification)
CSQ qualification du système de revêtement (coating system qualification)
CC courant continu
ESCR résistance à la fissuration sous contrainte due à l'environnement (environmental stress
cracking resistance)
PEHD polyéthylène haute densité
ITP plan de contrôles et d'essais (inspection and texting plan)
MFR indice de fluidité à chaud (melt flow rate); désigné par q pour une utilisation dans les
MFR
formules mathématiques
PE polyéthylène
ppd par diamètre de tuyau (per pipe diameter)
PPT Essai de pré-production (pre-production trial)
ISO/FDIS 21809-4:2025(fr)
PQT Essai de qualification du mode opératoire (pre-qualification trial)
SAW soudage à l'arc immergé sous flux en poudre (submerged arc welding)
UV ultraviolet
5 Exigences générales
5.1 Arrondis
Sauf indication contraire dans le présent document, afin de déterminer la conformité aux exigences
spécifiées, les valeurs observées ou calculées doivent être arrondies à l'unité la plus proche à la position la
plus à droite des chiffres exprimant la valeur limite, conformément à l'ISO 80000-1.
NOTE Pour les besoins de cette disposition, la méthode appliquée pour les arrondis dans l'ASTM E29 est
équivalente à celle de l'ISO 80000-1.
5.2 Conformité aux exigences
Il convient d'appliquer un système qualité et un système de gestion environnementale afin de favoriser la
conformité aux exigences du présent document.
NOTE L'ISO 9001 définit les exigences relatives aux systèmes de gestion de la qualité et l'ISO 14001 définit les
exigences relatives au choix et à l'utilisation d'un système de gestion de l'environnement.
L'applicateur doit se conformer à l'ensemble des exigences applicables du présent document et en a la
responsabilité. L'acheteur doit être autorisé à effectuer toutes les investigations nécessaires pour s'assurer
que l'applicateur s'y conforme et à refuser tout produit ou revêtement non conforme.
6 Informations à fournir par l'acheteur
6.1 Informations générales
Avant la commande, un accord doit être convenu entre l'acheteur et l'applicateur en ce qui concerne les
éléments suivants, stipulés dans la commande:
a) la référence du présent document et son année de publication (ISO 21809-4:—);
b) la quantité de tuyaux, le diamètre extérieur, l'épaisseur minimale et nominale, les longueurs minimale,
maximale et nominale, la nuance d'acier;
c) le calendrier de livraison demandé;
d) la documentation demandée et le calendrier de fourniture de la documentation;
e) les exigences relatives aux rapports d'essai et au rapport (journalier);
f) le type et la fréquence du certificat de réception;
g) les exigences relatives à la traçabilité du système de revêtement, aux réparations et au marquage des
réparations;
h) la norme ou la désignation de la spécification du tuyau nu, par exemple ISO 3183;
i) la classification et l'épaisseur du système de revêtement;
j) la conception non revêtue en extrémité, la longueur et les tolérances pour les deux extrémités du tuyau;
ISO/FDIS 21809-4:2025(fr)
k) les essais ou exigences supplément
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