oSIST prEN ISO 21809-3:2025

SLOVENSKI STANDARD
01-oktober-2025
Naftna in plinska industrija, vključno z nizkoogljično energijo - Zunanje prevleke
za cevovode, zakopane v zemljo ali potopljene v vodo, v transportnih cevovodnih
sistemih - 3. del: Prevleke cevovodnih spojev (ISO/DIS 21809-3:2025)
Oil and gas industries including lower carbon energy - External coatings for buried or
submerged pipelines used in pipeline transportation systems - Part 3: Field joint coatings
(ISO/DIS 21809-3:2025)
Erdöl- und Erdgasindustrie - Umhüllungen für erd- und wasserverlegte Rohrleitungen in
Transportsystemen - Teil 3: Nachumhüllung der Schweißverbindungen (ISO/DIS 21809-
3:2025)
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 3: Revêtements des joints réalisés sur site
(ISO/DIS 21809-3:2025)
Ta slovenski standard je istoveten z: prEN ISO 21809-3
ICS:
25.220.99 Druge obdelave in prevleke Other treatments and
coatings
75.200 Oprema za skladiščenje Petroleum products and
nafte, naftnih proizvodov in natural gas handling
zemeljskega plina equipment
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

DRAFT
International
Standard
ISO/DIS 21809-3
ISO/TC 67/SC 2
Oil and gas industries including
Secretariat: UNI
lower carbon energy — External
Voting begins on:
coatings for buried or submerged
2025-08-05
pipelines used in pipeline
Voting terminates on:
transportation systems —
2025-10-28
Part 3:
Field joint coatings
ICS: 75.200
THIS DOCUMENT IS A DRAFT CIRCULATED
FOR COMMENTS AND APPROVAL. IT
IS THEREFORE SUBJECT TO CHANGE
AND MAY NOT BE REFERRED TO AS AN
INTERNATIONAL STANDARD UNTIL
PUBLISHED AS SUCH.
This document is circulated as received from the committee secretariat.
IN ADDITION TO THEIR EVALUATION AS
BEING ACCEPTABLE FOR INDUSTRIAL,
TECHNOLOGICAL, COMMERCIAL AND
USER PURPOSES, DRAFT INTERNATIONAL
STANDARDS MAY ON OCCASION HAVE TO
ISO/CEN PARALLEL PROCESSING
BE CONSIDERED IN THE LIGHT OF THEIR
POTENTIAL TO BECOME STANDARDS TO
WHICH REFERENCE MAY BE MADE IN
NATIONAL REGULATIONS.
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 SUPPORTING DOCUMENTATION.
Reference number
ISO/DIS 21809-3:2025(en)
DRAFT
ISO/DIS 21809-3:2025(en)
International
Standard
ISO/DIS 21809-3
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 3:
Field joint coatings
ICS: 75.200
THIS DOCUMENT IS A DRAFT CIRCULATED
FOR COMMENTS AND APPROVAL. IT
IS THEREFORE SUBJECT TO CHANGE
AND MAY NOT BE REFERRED TO AS AN
INTERNATIONAL STANDARD UNTIL
PUBLISHED AS SUCH.
This document is circulated as received from the committee secretariat.
IN ADDITION TO THEIR EVALUATION AS
BEING ACCEPTABLE FOR INDUSTRIAL,
© ISO 2025
TECHNOLOGICAL, COMMERCIAL AND
USER PURPOSES, DRAFT INTERNATIONAL
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
STANDARDS MAY ON OCCASION HAVE TO
ISO/CEN PARALLEL PROCESSING
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on
BE CONSIDERED IN THE LIGHT OF THEIR
the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below
POTENTIAL TO BECOME STANDARDS TO
WHICH REFERENCE MAY BE MADE IN
or ISO’s member body in the country of the requester.
NATIONAL REGULATIONS.
ISO copyright office
RECIPIENTS OF THIS DRAFT ARE INVITED
CP 401 • Ch. de Blandonnet 8
TO SUBMIT, WITH THEIR COMMENTS,
CH-1214 Vernier, Geneva
NOTIFICATION OF ANY RELEVANT PATENT
Phone: +41 22 749 01 11
RIGHTS OF WHICH THEY ARE AWARE AND TO
PROVIDE SUPPORTING DOCUMENTATION.
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland Reference number
ISO/DIS 21809-3:2025(en)
ii
ISO/DIS 21809-3:2025(en)
Contents Page
Foreword .vii
Introduction .viii
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 4
4 Symbols and Abbreviated terms . 7
4.1 Symbols .7
4.2 Abbreviated terms .8
5 General requirements . 9
5.1 Responsibility of the end user .9
5.2 Rounding .9
5.3 Compliance, testing and quality .9
6 Information to be supplied . 9
6.1 General .9
6.2 Information to be supplied by the purchaser to the applicator .9
6.3 Information to be supplied by the applicator to the purchaser .10
7 Classification of field joint coatings.11
8 Qualification processes .12
8.1 Qualification of a coating system . 12
8.1.1 Coating Qualification (CQ), originated by the manufacturer . 13
8.1.2 Procedure Qualification Trial (PQT), originated by the applicator .14
8.1.3 Coating System Qualification (CSQ), originated by the applicator . 15
8.1.4 Pre-Production Trial (PPT), originated by the applicator . 15
8.1.5 Inspection and testing during production .16
8.2 Coating application documents .16
8.2.1 Application procedure specification (APS) .16
8.2.2 Inspection and Test Plan (ITP) .19
8.2.3 Inspection and Test Plan (ITP) . 20
8.2.4 Inspection documents, traceability and verification . 20
8.3 Qualification of coating operatives and inspection personnel .21
8.3.1 General .21
8.3.2 Qualification of coating operatives .21
8.3.3 Documentary evidence of applicator’s coating operatives’ qualification . 22
8.3.4 Requalification . 23
9 Surface preparation.23
9.1 General . 23
9.2 Preparation of the steel substrate . 23
9.2.1 General . 23
9.2.2 Abrasive blast-cleaning .24
9.2.3 Wire-brush cleaning.24
9.2.4 Other cleaning methods . 25
9.3 Preparation of the adjacent plant-applied coating. 25
10 Hot-applied bituminous tape coatings .27
10.1 Coating identification .27
10.2 Description of the coatings .27
10.3 Surface preparation .27
10.4 Coating application . 28
10.5 Testing of the applied coatings . 28
10.5.1 General . 28
11 Petrolatum and wax-based tape coatings .30

iii
ISO/DIS 21809-3:2025(en)
11.1 Coating identification . 30
11.2 Description of the coatings . 30
11.2.1 Petrolatum tapes (Type 11A) . 30
11.2.2 Wax-based tapes (Type 11B) . 30
11.3 Surface preparation . 30
11.4 Coating application .31
11.4.1 Application of the primer .31
11.4.2 Application of petrolatum or wax-based tapes .31
11.5 Testing of the applied coatings . .31
11.5.1 General .31
12 Cold-applied polymeric tape coatings .35
12.1 Coating identification . 35
12.2 Description of the coatings . 35
12.2.1 Cold-applied tape coatings with a polymeric continuous backing (Type 12A) . 35
12.2.2 Cold-applied tape coatings with a polymeric mesh backing (Type 12B) . 35
12.3 Surface preparation . 35
12.4 Coating application . 35
12.5 Testing of the applied coatings . 36
12.5.1 General . 36
13 Non-crystalline low-viscosity polyolefin-based coatings .40
13.1 Coating identification . 40
13.2 Description of the coatings . 40
13.3 Surface preparation . 40
13.4 Coating application . 40
13.5 Testing of the applied coatings . .41
13.5.1 General .41
13.5.2 Pre-application check of compound containing reinforcement .41
14 Coatings based on heat-shrinkable materials . 47
14.1 Coating identification .47
14.2 Description of the coatings .47
14.2.1 General .47
14.2.2 Type 14A .47
14.3 Surface preparation . 48
14.4 Coating application . 48
14.5 Testing of the applied coatings . 48
14.5.1 General . 48
15 Hot-applied microcrystalline wax coatings .56
15.1 Coating identification . 56
15.2 Description of the coatings . 56
15.3 Surface preparation . 56
15.4 Coating application . 56
15.5 Testing of the applied coatings . 56
15.5.1 General . 56
16 Elastomeric coatings .58
16.1 Coating identification . 58
16.2 Description of the coatings . 58
16.3 Surface preparation . 58
16.4 Coating application . 58
16.4.1 General . 58
16.4.2 In situ vulcanization method . 58
16.5 Testing of the applied coatings .59
16.5.1 General .59
16.5.2 Rheometer curve — Oscillating disc . 63
16.5.3 Electrical volume resistivity. 63
17 Fusion-bonded epoxy (FBE) powder coatings .63
17.1 Coating identification . 63

iv
ISO/DIS 21809-3:2025(en)
17.2 Description of the coatings . 63
17.3 Surface preparation . 63
17.4 Coating application . 63
17.4.1 General . 63
17.4.2 Transport and storage of epoxy powder . 64
17.4.3 Heating . 64
17.4.4 Application of epoxy powder . 64
17.5 Testing of the applied coatings . 64
17.5.1 General . 64
17.5.2 Thickness .67
18 Liquid-applied coatings . 67
18.1 Coating identification .67
18.2 Description of the coatings .67
18.2.1 Liquid epoxy — 18A .67
18.2.2 Liquid polyurethane — 18B .67
18.2.3 Fibre reinforced epoxy — 18C .67
18.2.4 Fibre reinforced vinylester — 18D .67
18.2.5 Fibre reinforced polyurethane — 18E .67
18.2.6 Polyolefin enclosure with polyurethane filling — 18F . 68
18.3 Surface preparation . 68
18.4 Coating application . 68
18.4.1 General . 68
18.4.2 Heating . 68
18.4.3 Liquide coating application . 68
18.4.4 General guideline . 68
18.5 Testing of the applied coatings . . 69
18.5.1 General . 69
19 Hot-applied polyolefin-based and polyurethane coatings .73
19.1 Coating identification . 73
19.2 Description of the coatings . 73
19.2.1 Coatings based on flame-sprayed polypropylene powder applied over an epoxy
layer— Type 19A . 73
19.2.2 Coatings based on polypropylene tapes/sheets / extruded hot-applied over an
epoxy layer— Type 19B. 73
19.2.3 Coatings based on injection-moulded polypropylene over an epoxy layer—
Type 19C . 73
19.2.4 Coatings based on flame-sprayed polyethylene powder applied over an epoxy
layer — Type 19D . 73
19.2.5 Coatings based on polyethylene tapes/sheets / extruded hot-applied over an
epoxy layer — Type 19E . . . .74
19.2.6 Coatings based on injection-moulded polyethylene over an epoxy layer —
Type 19F .74
19.2.7 Coatings based on injection-moulded polyurethane over an epoxy or a
polyurethane primer layer — Type 19G.74
19.3 Surface preparation .74
19.4 Coating application .74
19.4.1 General .74
19.4.2 Preparation of the plant applied coating .74
19.4.3 Heating . 75
19.4.4 Application of the primer . 75
19.4.5 Application of the chemically modified PP or PE . . 75
19.4.6 Application of the top coat . 75
19.5 Testing of the applied coatings .76
19.5.1 General .76
20 Thermal spray aluminium (TSA) coatings .83
20.1 Coating identification . 83
20.2 Description of the coatings . 83

v
ISO/DIS 21809-3:2025(en)
20.3 Surface preparation . 83
20.4 Coating application . 83
20.4.1 General . 83
20.4.2 Aluminium . 83
20.4.3 Sealer . 83
20.5 Testing of the applied coatings . 84
20.5.1 General . 84
Annex A (informative) Reporting of results .86
Annex B (informative) Inspection of thickness .90
Annex C (informative) Holiday detection test .92
Annex D (informative) Impact test .94
Annex E (informative) Indentation test .101
Annex F (informative) Specific electrical insulation resistance test .104
Annex G (informative) Cathodic disbondment test .114
Annex H (informative) Adhesion test (peel, lift and pull off) . 128
Annex I (informative) Hot water immersion (exposure) test .139
Annex J (informative) Lap shear test .142
Annex K (informative) Drip resistance test .145
Annex L (informative) Peel strength between layers .146
Annex M (informative) Thermal ageing resistance.149
Annex N (informative) Coating porosity test . 154
Annex O (informative) Bursting strength of reinforced backing .157
Annex P (informative) Thermal analysis of epoxy powder and cured coating film (FBE) . 158
Annex Q (informative) Adhesion test (X cut) — Resistance to removal .165
Annex R (informative) Coating flexibility test .167

vi
ISO/DIS 21809-3:2025(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 documents should be noted. This document was drafted in accordance with the editorial rules of the
ISO/IEC Directives, Part 2 (see www.iso.org/directives).
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 third edition cancels and replaces the second edition (ISO 21809-3:2016), which has been technically
revised. It also incorporates the Amendment ISO 21809-3:2016/Amd 1:2020.
A list of all parts in the ISO 21809-3 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.

vii
ISO/DIS 21809-3:2025(en)
Introduction
Users of this part of ISO 21809 are to be aware that further or differing requirements can be needed for
individual applications. This part of ISO 21809 is not intended to inhibit a vendor from offering, or the
purchaser from accepting, alternative equipment or engineering solutions for the individual application.
This can be particularly applicable where there is innovative or developing technology. Where an alternative
is offered, the vendor is to identify any variations from this part of ISO 21809 and provide details.

viii
DRAFT International Standard ISO/DIS 21809-3:2025(en)
Oil and gas industries including lower carbon energy —
External coatings for buried or submerged pipelines used in
pipeline transportation systems —
Part 3:
Field joint coatings
1 Scope
This part of ISO 21809 specifies requirements for field joint coating of seamless or welded steel pipes for
buried and submerged sections of pipeline transportation systems used in the petroleum, petrochemical and
natural gas industries as defined in ISO 13623. This part of ISO 21809 specifies the qualification, application
and testing of the corrosion protection coatings applied to steel surfaces left bare after the joining of pipes
and fittings
...