ISO 8179-2:2017

INTERNATIONAL ISO
STANDARD 8179-2
Second edition
2017-07
Ductile iron pipes, fittings, accessories
and their joints — External zinc-based
coating —
Part 2:
Zinc-rich paint
Tuyaux, raccords et accessoires en fonte ductile et leurs
assemblages — Revêtement extérieur à base de zinc —
Partie 2: Peinture riche en zinc
Reference number
ISO 8179-2:2017(E)
©
ISO 2017

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ISO 8179-2:2017(E)

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ISO 8179-2:2017(E)

Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Materials . 1
5 Zinc-rich paint coating . 1
5.1 Pipeline component surface condition . 1
5.2 Method of application . 1
5.3 Coating characteristics . 2
5.4 Zinc-rich paint coating mass . 2
5.5 Repairs to the zinc-rich paint coating . 2
6 Finishing layer . 2
7 Test methods . 3
7.1 Determination of zinc-rich paint coating mass . 3
7.2 Determination of the dry film thickness of the finishing layer . . 3
Annex A (informative) Field verification of the zinc-rich paint coating mass on a finished product 4
Annex B (informative) Field of use in relation to the characteristics of soils: Standard coating .6
Bibliography . 7
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ISO 8179-2:2017(E)

Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards is normally carried out
through ISO technical committees. Each member body interested in a subject for which a technical
committee has been established has the right to be represented on that committee. International
organizations, governmental and non-governmental, in liaison with ISO, also take part in the work.
ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of
electrotechnical standardization.
The procedures used to develop this document and those intended for its further maintenance are
described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the
different types of ISO documents should be noted. This document was drafted in accordance with the
editorial rules of the ISO/IEC Directives, Part 2 (see www .iso .org/ directives).
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of
any patent rights identified during the development of the document will be in the Introduction and/or
on the ISO list of patent declarations received (see www .iso .org/ patents).
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation 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: w w w . i s o .org/ iso/ foreword .html.
This document was prepared by Technical Committee ISO/TC 5, Ferrous metal pipes and metallic fittings,
Subcommittee SC 2, Cast iron pipes, fittings and their joints.
This second edition cancels and replaces the first edition (ISO 8179-2:1995), which has been technically
revised. The following changes have been made:
2 2
— the minimum quantity of Zn has been increased from 130 g/m to 200 g/m ;
— the revision recognizes the technological advancements in the field regarding zinc-based coatings
to increase the lifetime and reliability of ductile iron pipelines, improving protection to different
types of corrosion (including general and localized) and the use of new alloy enrichments.
A list of all parts in the ISO 8179 series can be found on the ISO website.
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INTERNATIONAL STANDARD ISO 8179-2:2017(E)
Ductile iron pipes, fittings, accessories and their joints —
External zinc-based coating —
Part 2:
Zinc-rich paint
1 Scope
This document specifies an external protective coating system which is factory-applied to ductile iron
pipeline components as specified in ISO 2531, ISO 7186 and ISO 16631. This coating system comprises a
zinc-rich paint followed by a finishing layer that can be bituminous paint or synthetic resin compatible
with zinc rich paint coating.
NOTE ISO 8179-1 addresses metallic zinc-based coatings.
2 Normative references
There are no normative references in this document.
3 Terms and definitions
No terms and definitions are listed in this document.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— IEC Electropedia: available at http:// www .electropedia .org/
— ISO Online browsing platform: available at http:// www .iso .org/ obp
4 Materials
The coating materials shall be zinc-rich paint with organic or/and inorganic binder and zinc content of
at least a mass fraction of 85 % in the dry film followed by a finishing layer that can be bituminous paint
or synthetic resin compatible with zinc-rich paint coating.
5 Zinc-rich paint coating
5.1 Pipeline component surface condition
The pipeline component surface shall be dry and free from rust or any non-adhering particles or foreign
matter such as oil or grease.
The zinc-rich paint coating shall be applied to the as-cast annealed external surface of the pipeline
component or to a blast-cleaned or ground surface at the manufacturer’s discretion.
5.2 Method of application
The zinc-rich paint coating shall be applied by a spraying or brushing process onto the pipeline
component surface.
The design and construction of the spray equipment are not within the scope of this document.
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