prEN ISO 21809-5
(Main)Oil and gas industries including lower carbon energy - External coatings for buried or submerged pipelines used in pipeline transportation systems - Part 5: External concrete coatings (ISO/DIS 21809-5:2025)
Oil and gas industries including lower carbon energy - External coatings for buried or submerged pipelines used in pipeline transportation systems - Part 5: External concrete coatings (ISO/DIS 21809-5:2025)
ISO 21809-5:2017 specifies the requirements for qualification, application, testing and handling of materials required for the application of reinforced concrete coating externally to either bare pipe or pre-coated pipe for use in pipeline transportation systems for the petroleum and natural gas industries as defined in ISO 13623.
The external application of concrete is primarily used for the negative buoyancy of pipes used in buried or submerged pipeline systems and/or for the mechanical protection of the pipe and its pre-coating.
ISO 21809-5:2017 is applicable to concrete thicknesses of 25 mm or greater.
Öl- und Gasindustrie einschließlich kohlenstoffarmer Energieträger - Außenbeschichtungen für erd- und wasserverlegte Rohrleitungen in Transportsystemen - Teil 5: Betonummantelungen (ISO/DIS 21809‑5:2025)
Industries du pétrole et du gaz naturel - Revêtements externes des conduites enterrées ou immergées utilisées dans les systèmes de transport par conduites - Partie 5: Revêtements externes en béton (ISO/DIS 21809-5:2025)
L'ISO 21809-5:2017 spécifie les exigences relatives à la qualification, à la mise en ?uvre, aux essais et à la manutention des matériaux requis pour l'application d'un revêtement extérieur en béton armé sur des tubes en acier nus ou pré-revêtus, utilisés dans les systèmes de transport par conduites pour les industries du pétrole et du gaz naturel tels que définis dans l'ISO 13623.
L'application extérieure de béton est principalement utilisée pour empêcher la flottabilité des tubes utilisés dans les systèmes de conduites enterrées et immergées et/ou pour la protection mécanique du tube et de son pré-revêtement.
L'ISO 21809-5:2017 s'applique aux épaisseurs de béton supérieures ou égales à 25 mm.
Naftna in plinska industrija, vključno z nizkoogljično energijo - Zunanje prevleke za cevovode, zakopane v zemljo ali potopljene v vodo, v sistemih cevovodnega transporta - 5. del: Zunanje betonske prevleke (ISO/DIS 21809-5:2025)
General Information
Relations
Overview
The prEN ISO 21809-5 standard, titled "Oil and gas industries including lower carbon energy - External coatings for buried or submerged pipelines used in pipeline transportation systems - Part 5: External concrete coatings", provides comprehensive requirements for the application of reinforced concrete coatings to pipelines in the petroleum and natural gas industries. Developed under the auspices of CEN and aligned with ISO/DIS 21809-5:2025, this standard addresses the qualification, application, testing, and handling of concrete coatings applied externally to either bare or pre-coated pipes.
Designed primarily for pipelines that are buried or submerged, the external concrete coatings specified are essential to provide negative buoyancy, ensuring stability under water or underground, and also deliver mechanical protection to vulnerable pipeline sections. This standard applies to concrete coatings with thicknesses equal to or greater than 25 mm.
Key Topics
Scope and Purpose
Defines the use of reinforced concrete external coatings for pipeline transportation systems in oil, gas, and low-carbon energy sectors, focusing on durability, safety, and performance.Materials Specification
Covers the properties and specifications of materials used in concrete coatings including cement, aggregates (fine, coarse, heavyweight, lightweight, recycled), water, steel reinforcement, and admixtures.Concrete Mix Design
Guidance on selecting and preparing concrete mixtures suitable for durable external coatings, optimizing for mechanical protection and weight requirements.Application Procedures
Details qualification protocols, application methodologies, environmental condition considerations, and installation of concrete coatings onto both bare and pre-coated pipes.Testing & Inspection Methods
Specifies standardized tests such as concrete coating thickness measurement, compressive strength, water absorption, impact resistance, shear resistance, and visual inspection to ensure compliance and quality assurance.Curing, Repair, and Handling
Instructions on curing techniques to achieve optimum concrete properties, along with procedures for repairing damaged coatings, and recommended practices for storage and handling to prevent damage before installation.Marking and Documentation
Establishes requirements for marking coated pipes and maintaining comprehensive test reports and inspection documents for traceability and regulatory compliance.
Applications
This standard is highly relevant for:
- Pipeline manufacturers and coating applicators seeking to comply with international quality and safety requirements for external concrete coatings.
- Oil and gas infrastructure projects that require enhanced pipeline protection against mechanical damage and buoyancy forces in buried or submerged environments.
- Lower carbon energy pipeline systems where concrete coatings contribute to sustainability by ensuring longer service life and reducing maintenance needs.
- Pipeline designers and engineers incorporating concrete coatings as a critical element in pipeline integrity management.
- Regulatory bodies and certification agencies evaluating compliance of pipeline external coatings with recognized international standards.
By adhering to ISO 21809-5, stakeholders can mitigate corrosion risks, minimize environmental impacts, and extend operational longevity of pipeline assets.
Related Standards
- ISO 13623 - Pipeline transportation systems for the petroleum and natural gas industries: Defines the general pipeline system requirements referenced in ISO 21809-5.
- ISO 21809-1 to ISO 21809-4 - Other parts of the external coatings series addressing different materials such as polyethylene or fusion bonded epoxy coatings.
- National and regional standards harmonizing with ISO/EN standards for pipeline coatings applied in oil, gas, and energy sectors.
- ISO 9001 - Quality management systems, often integrated to ensure process consistency in coating applications.
- Environmental and safety standards relevant to pipeline transportation and construction in buried or submerged contexts.
Keywords: external concrete coatings, pipeline transportation, oil and gas industries, buried pipelines, submerged pipelines, pipeline coatings, reinforced concrete coating, pipeline protection, negative buoyancy, pipeline integrity, ISO 21809-5, pipeline standards, pipeline coatings testing, concrete coating application, low-carbon energy pipelines.
Standards Content (Sample)
SLOVENSKI STANDARD
01-marec-2025
Naftna in plinska industrija, vključno z nizkoogljično energijo - Zunanje prevleke
za cevovode, zakopane v zemljo ali potopljene v vodo, v sistemih cevovodnega
transporta - 5. del: Zunanje betonske prevleke (ISO/DIS 21809-5:2025)
Oil and gas industries including lower carbon energy - External coatings for buried or
submerged pipelines used in pipeline transportation systems - Part 5: External concrete
coatings (ISO/DIS 21809-5:2025)
Industries du pétrole et du gaz naturel - Revêtements externes des conduites enterrées
ou immergées utilisées dans les systèmes de transport par conduites - Partie 5:
Revêtements externes en béton (ISO/DIS 21809-5:2025)
Ta slovenski standard je istoveten z: prEN ISO 21809-5
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 21809-5
ISO/TC 67/SC 2
Oil and gas industries including
Secretariat: UNI
lower carbon energy — External
Voting begins on:
coatings for buried or submerged
2025-01-15
pipelines used in pipeline
Voting terminates on:
transportation systems —
2025-04-09
Part 5:
External concrete 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 21809-5:2025(en)
DRAFT
ISO/DIS 21809-5:2025(en)
International
Standard
ISO/DIS 21809-5
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 5:
External concrete 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
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POTENTIAL TO BECOME STANDARDS TO
WHICH REFERENCE MAY BE MADE IN
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NATIONAL REGULATIONS.
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RECIPIENTS OF THIS DRAFT ARE INVITED
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TO SUBMIT, WITH THEIR COMMENTS,
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NOTIFICATION OF ANY RELEVANT PATENT
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Website: www.iso.org
Published in Switzerland Reference number
ISO/DIS 21809-5:2025(en)
ii
ISO/DIS 21809-5:2025(en)
Contents Page
Foreword .v
Introduction .vi
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 .7
5 General requirements . 7
5.1 Rounding .7
5.2 Compliance with this document .7
5.3 End user approval .7
6 Information supplied by the purchaser . 8
6.1 General information.8
6.2 Additional information.8
7 Materials . 8
7.1 Pipe .8
7.2 Cement .9
7.3 Supplementary cementitious materials .9
7.4 Aggregate — Fine and coarse .10
7.5 Heavyweight aggregate .10
7.6 Lightweight aggregate .10
7.7 Recycled concrete as aggregate .11
7.8 Water .11
7.9 Steel reinforcement .11
7.10 Concrete admixtures .11
7.11 Reclaimed concrete .11
8 Concrete mix . .11
9 Coating application . .12
9.1 Qualification . 12
9.1.1 Application procedure specification (APS) .14
9.2 Application of concrete coating .14
9.3 Environmental conditions . . 15
9.4 Pipe . 15
9.4.1 Pre-coated pipe . 15
9.4.2 Bare pipe . 15
9.5 Steel reinforcement . 15
9.5.1 General . 15
9.5.2 Cage reinforcement . 15
9.5.3 Welded wire mesh reinforcement .16
9.5.4 Reinforcement placement .16
9.6 Concrete cutback .17
9.7 Anode installation .17
10 Curing methods .18
11 Inspection and testing .18
11.1 General .18
11.2 Test procedures .19
11.2.1 Concrete coating thickness — Diameter measurement .19
11.2.2 Placement of reinforcement. 20
11.2.3 Pre-concrete coated pipe weight in air . 20
iii
ISO/DIS 21809-5:2025(en)
11.2.4 Concrete coated pipe weight in air . 20
11.2.5 Concrete coating density .21
11.2.6 Compressive strength .21
11.2.7 Water absorption .21
11.2.8 Impact resistance . 22
11.2.9 Shear resistance . 22
11.2.10 Visual inspection . 22
11.3 Retesting . 22
11.4 Test results . 22
12 Repair of concrete coated pipe .23
12.1 General . 23
12.2 Damaged areas . 23
12.3 Cracks . 23
12.4 Gaps . 23
12.5 Stripping . 23
13 Markings .23
14 Handling and storage .24
15 Test reports and inspection documents .24
Annex A (normative) Water absorption test .25
Annex B (normative) Shear resistance test .28
Annex C (normative) Procedure qualification trial (PQT), inspection and testing plan (ITP)
and daily log .30
Annex D (Normative) Density of Hardened Concrete Test .33
Bibliography .36
iv
ISO/DIS 21809-5:2025(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).
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of any patent
rights identified during the development of the document will be in the Introduction and/or on the ISO list of
patent declarations received (see www.iso.org/patents).
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation on 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 the following URL:
www.iso.org/iso/foreword.html.
This document was prepared by Technical Committee ISO/TC 67, Materials, equipment and offshore structures
for petroleum, petrochemical and natural gas industries, Subcommittee SC 2, Pipeline transportation systems.
This third edition cancels and replaces the second edition (ISO 21809-5:2017), which has been technically
revised.
A list of all parts in the ISO 21809 series can be found on the ISO website.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www.iso.org/members.html.
v
ISO/DIS 21809-5:2025(en)
Introduction
It is necessary that users of this document be aware that further or differing requirements might be needed
for individual applications. This document is not intended to inhibit a vendor from offering or the purchaser
from accepting alternative equipment or engineering solutions for the individual application. This can be
particularly applicable if there is innovative or developing technology. If an alternative is offered, it is the
responsibility of the vendor to identify any variations from this document and provide details.
vi
DRAFT International Standard ISO/DIS 21809-5:2025(en)
Oil and gas industries including lower carbon energy —
External coatings for buried or submerged pipelines used in
pipeline transportation systems —
Part 5:
External concrete coatings
1 Scope
This document specifies the requirements for qualification, application, testing and handling of materials
required for the application of reinforced concrete coating externally to either bare pipe or pre-coated
pipe for use in pipeline transportation systems for the petroleum and natural gas industries as defined in
ISO 13623.
The external application of concrete is primarily used for the negative buoyancy of pipes used in buried or
submerged pipeline systems and/or for the mechanical protection of the pipe and its pre-coating.
This document is applicable to concrete thicknesses of 25 mm or greater.
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 1920-5, Testing of concrete — Part 5: Density and water penetration depth
ISO 10474, Steel and steel products — Inspection documents
ISO 16120-2, Non-alloy steel wire rod for conversion to wire — Part 2: Specific requirements for general purpose
wire rod
ISO 80000-1, Quantities and units — Part 1: General
EN 197-1, Cement — Part 1: Composition, specifications and conformity criteria for common cements
EN 206-1, Concrete — Part 1: Specification, performance, production and conformity
EN 450-1, Fly ash for concrete — Part 1: Definition, specifications and conformity criteria
EN 934-2, Admixtures for concrete, mortar and grout — Part 2: Concrete admixtures — Definitions, requirements
conformity, marking and labelling
EN 1008, Mixing water for concrete — Specification for sampling, testing and assessing the suitability of water,
including water recovered from processes in the concrete industry, as mixing water for concrete
EN 10080, Steel for the reinforcement of concrete — Weldable reinforcing steel — General
EN 10204, Metallic products — Types of inspection documents
EN 10244-2, Steel wire and wire products — Non-ferrous metallic coatings on steel wire — Part 2: Zinc or zinc
alloy coatings
ISO/DIS 21809-5:2025(en)
EN 12390-2, Testing hardened concrete — Part 2: Making and curing specimens for strength tests
EN 12390-3, Testing hardened concrete — Part 3: Compressive strength of test specimens
EN 12390-7, Testing hardened concrete — Part 7: Density of hardened concrete
EN 12504-1, Testing concrete in structures — Part 1: Cored specimens — Taking, examining and testing in
compression
EN 12620, Aggregates for concrete
EN 13055-1, Lightweight aggregates — Part 1: Lightweight aggregates for concrete, mortar and grout
EN 13263-1, Silica fume for concrete — Part 1: Definitions, requirements and conformity criteria
ACI 308.1-98, Standard specification for curing concrete
ASTM A641, Standard specification for zinc-coated (galvanized) carbon steel wire
ASTM A810, Standard specification for zinc-coated (galvanized) steel pipe winding mesh
ASTM A1064, Standard specification for carbon-steel wire and welded wire reinforcement, plain and deformed,
for concrete
ASTM C31, Standard practice for making and curing concrete test specimens in the field
ASTM C33, Standard specification for concrete aggregates
ASTM C39, Standard test method for compressive strength of cylindrical concrete specimens
ASTM C40, Standard test method for organic impurities in fine aggregates for concrete
ASTM C42, Standard test method for obtaining and testing drilled cores and sawed beams of concrete
ASTM C128, Standard test method for density, relative density (specific gravity) and absorption of fine aggregate
ASTM C150, Standard specification for Portland cement
ASTM C171, Standard specification for sheet materials for curing concrete
ASTM C172, Standard practice for sampling freshly mixed concrete
ASTM C309, Standard specification for liquid membrane-forming compounds for curing concrete
ASTM C330, Standard specification for lightweight aggregates for structural concrete
ASTM C331, Standard specification for lightweight aggregates for concrete masonry units
ASTM C332, Standard specification for lightweight aggregates for insulating concrete
ASTM C494, Standard specification for chemical admixtures for concrete
ASTM C595, Standard specification for blended hydraulic cements
ASTM C617, Standard practice for capping cylindrical concrete specimens
ASTM C618, Standard specification for coal fly ash and raw or calcined natural Pozzolan for use in concrete
ASTM C637, Standard specification for aggregates for radiation-shielding concrete
ASTM C642, Standard test method for density, absorption, and voids in hardened concrete
ASTM C989, Standard specification for slag cement for use in concrete and mortars
ASTM C1157, Standard performance specification for hydraulic cement
ISO/DIS 21809-5:2025(en)
ASTM C1176, Standard practice for making roller-compacted concrete in cylinder molds using a vibrating table
ASTM C1778, Standard test method for reducing the risk of deleterious alkali-aggregate reaction in concrete
ASTM C1240, Standard specification for silica fume used in cementitious mixtures
ASTM C1435, Standard practice for molding roller-compacted concrete in cylinder molds using a vibrating hammer
ASTM C1602, Standard specification for mixing water used in the production of hydraulic cement concrete
ASTM C1604, Standard test method for obtaining and testing drilled cores of shotcrete
ASTM D2216, Standard test methods for laboratory determination of water (moisture) content of soil and
rock by mass
ASTM D4643, Standard test method for determination of water (moisture) content of soil by microwave oven heating
ASTM D4959, Standard test method for determination of water content of soil by direct heating
ASTM D6176, Standard practice for measuring surface atmospheric temperature with electrical resistance
temperature sensors
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at https:// www .electropedia .org/
For the purposes of this document, the following terms and definitions apply
3.1
aggregate
fine and coarse granular material such as sand, crushed stone, iron blast furnace slag, magnetite, ilmenite,
or hematite used with a cement medium to form concrete or mortar
3.2
anode
sacrificial metallic attachment that is electrically connected to the steel pipe
3.3
anode infill
materials used to fill the gap between the anode and concrete for electrical isolation and mechanical
continuity
3.4
applicator
company that undertakes the coating application in accordance with this part of ISO 21809
3.5
application procedure specification
APS
Document describing procedures, methods, equipment and tools used for coating application
3.6
cementitious material
inorganic material or a mixture of inorganic materials that sets and develops strength by chemical reaction
with water by formation of hydrates and is capable of doing so under water
ISO/DIS 21809-5:2025(en)
3.7
compression wrap process
process by which the concrete mix is discharged into a coating head and applied in a continuous helical strip
with pressure onto a rotating pipe
3.8
compressive strength
maximum compressive stress at the point of failure
3.9
concrete admixture
material, other than aggregate (3.1), water, cement or supplementary cementitious material (3.33), or fibre
reinforcement, that is added as an ingredient to the concrete mix or one of its components, to enhance or
modify the properties of the concrete or application process
3.10
concrete coated pipe weight
weight of the concrete coated pipe in air after the concrete cutback (3.13) has been completed
3.11
core
cylindrical specimen of a specific or designated diameter drilled from hardened concrete coating to be
tested in compression or examined petrographically
3.12
cover
distance between the surface of the reinforcement and the outer surface of the concrete
3.13
cube
specimen of specific dimensions prepared from fresh concrete to be tested in compression
3.14
curing
action taken to maintain moisture and temperature conditions in a freshly placed cementitious mixture
to allow hydraulic cement hydration and (if applicable) pozzolanic reactions to occur so that the required
properties of the mix can develop
3.15
cutback
length of pipe left without concrete coating at each end
3.16
cylinder
cylindrical specimen prepared from fresh concrete to be tested in compression
3.17
electrical isolation
absence of electrical continuity between the steel pipe and reinforcement
3.18
end user
company (companies) that own(s) and/or operate(s) pipeline(s)
3.19
field specimen
cores (3.9), cubes (3.11), cylinders (3.14), prisms or in situ specimens taken from the hardened concrete coating
3.20
form process
pump process
process by which the concrete mix is poured into a mould on a stationary pipe
ISO/DIS 21809-5:2025(en)
3.21
gap
annular separation between the concrete coating and the underlying substrate
3.22
holiday
pre-coating (3.25) discontinuity that exhibits electrical conductivity when exposed to a specific voltage
3.23
impact resistance
resistance of concrete coating against interference and accidental loads
3.24
impingement process
process by which the concrete is discharged at high velocity onto a rotating pipe
3.25
inspection and testing plan
ITP
document providing an overview of the sequence of inspections and tests, including appropriate resources,
procedures and acceptance criteria
3.26
mix design
unique blend of aggregates (3.1), cement, water, and supplementary cementitious materials (3.33) and/or
admixtures that will result in a concrete mix
3.27
negative buoyancy
weight of the concrete coated pipe less the positive buoyancy of the concrete coated pipe when considered
as a closed cylinder (3.16) immersed in the service environment
3.28
pipeline
components of a pipeline system connected together to convey fluids between stations and/or plants,
including pipe, pig traps, components, appurtenances, isolating valves, and sectionalizing valves
[SOURCE: ISO 13623:2017, 3.1.15, modified]
3.29
pipeline system
pipelines, stations, supervisory control and data acquisition system (SCADA), safety systems, corrosion
protection systems, and any other equipment, facility or building used in the transportation of fluids
[SOURCE: ISO 13623:2017, 3.1.16]
3.30
pi tape
tape used to measure the diameter of the concrete coated pipe
3.31
pre-coating
any coating or coating system applied to the external surface of the steel pipe prior to the application of the
concrete coating
3.32
procedure qualification trial
PQT
application of a coating and subsequent inspection/testing of its properties, to confirm that the APS is adequate
to produce a coating with the specified properties, carried out prior in correlation to a specific project
ISO/DIS 21809-5:2025(en)
3.33
purchaser
company responsible for providing the purchase order requirements
3.34
reclaimed concrete
concrete that is reintroduced into the mix and does not require processing before reuse
3.35
recycled concrete as aggregate
concrete that has been reprocessed for use as aggregate (3.1)
3.36
shear resistance
resistance against relative displacement (movement) along the interface between the concrete coating and
the underlying pre-coating (3.25)
3.37
slip form process
process whereby the concrete is applied to a vertical pipe by means of a slip form mould
3.38
specific gravity
ratio of mass of a volume of material to the mass of an equal volume of distilled water at a stated temperature
3.39
steel reinforcement
bars, wires, fibres, or strands, which are embedded in the concrete coating in such a manner that the
reinforcement and the concrete act together in resisting forces
3.40
supplementary cementitious material
SCM
natural or man-made siliceous or siliceous and aluminous materials that can be used to either partially
substitute Portland cement or increase the total content of cementitious material (3.4) in concrete mixes to
improve the strength and durability of concrete
EXAMPLE Fly ash, ground granulated blast furnace slag, silica fume, calcined shale or metakaolin.
3.41
supplier
provider or manufacturer of supplies or materials used in the application of concrete coating
3.42
test report
document that provides the quantitative test results for tests conducted in accordance with the requirements
of this document
3.43
wire mesh overlap
distance between the end longitudinal wires when the reinforcement is superimposed over the previous
layer of placed reinforcement
ISO/DIS 21809-5:2025(en)
4 Symbols and abbreviated terms
4.1 Symbols
D bare pipe diameter (mm)
b
D average concrete coated pipe diameter (mm)
c
t concrete thickness (mm)
c
t pre-coating minimum thickness (mm)
p
4.2 Abbreviated terms
AWG American wire gauge
APS application procedure specification
SCM supplementary cementitious materials
5 General requirements
5.1 Rounding
Unless otherwise stated in this document, to determine conformance with the specified requirements,
observed or calculated values shall be rounded to the nearest unit in the last right-hand place of figures used
in expressing the limiting value, in compliance with ISO 80000-1.
NOTE For the purposes of this provision, the rounding method of ASTM E29 is equivalent to ISO 80000-1.
5.2 Compliance with this document
A quality system and an environmental management system should be applied to assist compliance with the
requirements of this document.
1. ISO/TS 29001 gives sector-specific guidance on quality management systems.
2. ISO 14001 gives requirements with guidance for the use of an environmental management system.
3. ISO/IEC 17025 gives general requirements for the competence of testing and calibration laboratories.
The applicator shall be responsible for complying with the applicable health, safety and environmental
regulations in the country where the work is performed.
The applicator shall be responsible for complying with all of the applicable requirements of this document. It
shall be permissible for the purchaser or end user to make any investigation necessary in order to be assured
of compliance by the applicator and to reject any material and/or concrete coating that does not comply.
5.3 End user approval
Where purchaser agreement, approval or authorization is specified in ISO 21809-5, end user acceptance is
also required.
ISO/DIS 21809-5:2025(en)
6 Information supplied by the purchaser
6.1 General information
The purchase order shall include the following information:
a) the number of this document and year of publication (i.e., ISO 21809-5:2017);
b) pipe quantity, outside diameter, wall thickness, minimum and maximum individual pipe lengths, type
and thickness of pre-coating;
c) bare pipe standard or specification designation, e.g. ISO 3183, or pre-coated pipe standard or
specification designation, e.g. ISO 21809-2;
d) concrete coating thickness, density or specific gravity or negative buoyancy and compressive strength;
e) applicable project specifications;
f) reinforcement type, standard and cross-sectional area percentages;
g) concrete coating cutback length, cutback design and tolerances for each pipe end;
h) pre-coating inspection and repair requirements;
i) markings to be applied to the concrete coated pipe;
j) frequency of concrete coating density test during coating production (see Table 2).
6.2 Additional information
The purchase order shall indicate which of the following provisions apply for the specific order item:
a) plant inspection by the purchaser;
b) additional tests, types and frequency;
c) handling procedures;
d) storage procedures;
e) requirement for applicator to submit details of the facilities and the methods to be used for yard storage;
f) waiver of test reports;
g) other special requirements, e.g. impact resistance, shear resistance for tension transfer on the pipe
lay vessel;
h) anode location area, infill materials and installation procedure.
i) purchaser approval of APS/ITP;
j) inspection and testing plan and/or daily log;
7 Materials
7.1 Pipe
The supply of bare or pre-coated pipe to be concrete coated shall conform to the pipe and pre-coating
standards or specifications that are specified in the purchase order.
ISO/DIS 21809-5:2025(en)
IMPORTANT — Pre-coated steel pipe might not necessarily have a surface condition that is
appropriate for the application of concrete coating. Remediation of the bare steel pipe or pre-coating
may therefore be required.
7.2 Cement
The applicator shall use cement that is:
a) certified by the supplier to be in compliance with the requirements of ASTM C150, ASTM C595,
ASTM C1157 or EN 197-1; or other standards when agreed between applicator and purchaser.
b) identified with the following information on the certification and/or delivery documents for each
shipment of cement:
— cement producer’s name and location,
— product description including type and classification of cement, and
— year and month of production;
c) handled, transported and stored prior to use, in compliance with the cement manufacturer’s
recommendations and in compliance with the applicable standards;
d) no more than 6 months from the date of manufacture for bulk cement or 3 months from date of
manufacture for bagged cement, unless it is retested and proven to be in compliance with the original
standard.
NOTE Cement stored in a warm, humid environment for an extended period of time could possibly lose significant
properties.
For submerged service conditions using concrete mixes containing Portland cement as the only cementitious
material, the tricalcium aluminate (C A) content of the cement shall be less than or equal to 8,0 %. For all
other service conditions, the tricalcium aluminate content limit is not applicable.
For submerged service conditions using concrete mixes containing Portland cement as the only cementitious
material, ASTM C1778 shall be used (for testing) if potentially reactive aggregates are used.
7.3 Supplementary cementitious materials
If approved by the purchaser, the applicator shall use SCMs that are:
a) certified by the supplier to be in compliance with the requirements of ASTM C618, ASTM C989,
ASTM C1240, EN 450-1 or EN 13263-1;
b) identified with the following information on the certification and/or delivery documents for each
shipment of SCMs:
1) SCM producer’s name and location,
2) product description including type and classification of SCM, and
3) year and month of production;
c) handled, transported and stored prior to use, in compliance with the SCM supplier’s recommendations
and in compliance with the applicable standard;
d) within time limits stated in the applicable standard, unless it is retested and proven to be in compliance
with the original standard.
NOTE SCMs stored in a warm, humid environment for an extended period of time could possibly lose significant
properties. This clause does not apply to blended cements certified by the cement manufacturer.
ISO/DIS 21809-5:2025(en)
7.4 Aggregate — Fine and coarse
The applicator shall use fine or a combination of fine and coarse aggregates that are:
a) certified by the supplier to be in compliance with the requirements of ASTM C33 or EN 12620;
b) identified with the following on the certification and/or delivery documents for each source of aggregate:
1) aggregate supplier’s name and location,
2) product description including gradation, and
3) qualification standard or specification;
c) stored in such a condition as to prevent contamination and shall remain in compliance with the
applicable standard.
The applicator shall verify that the aggregate received meets the above requirements.
7.5 Heavyweight aggregate
If required, the applicator shall use heavyweight aggregate with an oven-dried density higher than 3 000 kg/
m , such as iron ore or other dense material, that is:
a) certified by the supplier to be in complianc
...
Frequently Asked Questions
prEN ISO 21809-5 is a draft published by the European Committee for Standardization (CEN). Its full title is "Oil and gas industries including lower carbon energy - External coatings for buried or submerged pipelines used in pipeline transportation systems - Part 5: External concrete coatings (ISO/DIS 21809-5:2025)". This standard covers: ISO 21809-5:2017 specifies the requirements for qualification, application, testing and handling of materials required for the application of reinforced concrete coating externally to either bare pipe or pre-coated pipe for use in pipeline transportation systems for the petroleum and natural gas industries as defined in ISO 13623. The external application of concrete is primarily used for the negative buoyancy of pipes used in buried or submerged pipeline systems and/or for the mechanical protection of the pipe and its pre-coating. ISO 21809-5:2017 is applicable to concrete thicknesses of 25 mm or greater.
ISO 21809-5:2017 specifies the requirements for qualification, application, testing and handling of materials required for the application of reinforced concrete coating externally to either bare pipe or pre-coated pipe for use in pipeline transportation systems for the petroleum and natural gas industries as defined in ISO 13623. The external application of concrete is primarily used for the negative buoyancy of pipes used in buried or submerged pipeline systems and/or for the mechanical protection of the pipe and its pre-coating. ISO 21809-5:2017 is applicable to concrete thicknesses of 25 mm or greater.
prEN ISO 21809-5 is classified under the following ICS (International Classification for Standards) categories: 75.200 - Petroleum products and natural gas handling equipment. The ICS classification helps identify the subject area and facilitates finding related standards.
prEN ISO 21809-5 has the following relationships with other standards: It is inter standard links to EN ISO 21809-5:2017. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.
You can purchase prEN ISO 21809-5 directly from iTeh Standards. The document is available in PDF format and is delivered instantly after payment. Add the standard to your cart and complete the secure checkout process. iTeh Standards is an authorized distributor of CEN standards.
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