EN ISO 28763:2011

SLOVENSKI STANDARD
01-januar-2012
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Vitreous and porcelain enamels - Regenerative, enamelled and packed panels for air-
gas and gas-gas heat exchangers - Specifications (ISO 28763:2008)
Emails und Emaillierungen - Regenerative, emaillierte und gepackte Bleche für Luft-Gas-
und Gas-Gas-Wärmeaustauscher - Anforderungen (ISO 28763:2008)
Émaux vitrifiés - Échangeurs thermiques pour réchauffeurs air-gaz et gaz-gaz à
empilement de panneaux émaillés remplaçables et démontables - Spécifications (ISO
28763:2008)
Ta slovenski standard je istoveten z: EN ISO 28763:2011
ICS:
25.220.50 Emajlne prevleke Enamels
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD
EN ISO 28763
NORME EUROPÉENNE
EUROPÄISCHE NORM
March 2011
ICS 25.220.50 Supersedes EN 14866:2005
English Version
Vitreous and porcelain enamels - Regenerative, enamelled and
packed panels for air-gas and gas-gas heat exchangers -
Specifications (ISO 28763:2008)
Émaux vitrifiés - Échangeurs thermiques pour réchauffeurs Emails und Emaillierungen - Regenerative, emaillierte und
air-gaz et gaz-gaz à empilement de panneaux émaillés gepackte Bleche für Luft-Gas- und Gas-Gas-
remplaçables et démontables - Spécifications (ISO Wärmeaustauscher - Anforderungen (ISO 28763:2008)
28763:2008)
This European Standard was approved by CEN on 3 March 2011.

CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European
Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national
standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN member.

This European Standard exists in three official versions (English, French, German). A version in any other language made by translation
under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management Centre has the same
status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland,
Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.

EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2011 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 28763:2011: E
worldwide for CEN national Members.

Contents Page
Foreword .3

Foreword
The text of ISO 28763:2008 has been prepared by Technical Committee ISO/TC 107 “Metallic and other
inorganic coatings” of the International Organization for Standardization (ISO) and has been taken over as
secretariat of which is held by BSI.
This European Standard shall be given the status of a national standard, either by publication of an identical
text or by endorsement, at the latest by September 2011, and conflicting national standards shall be
withdrawn at the latest by September 2011.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent rights.
This document supersedes EN 14866:2005.
According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following
countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech
Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain,
Sweden, Switzerland and the United Kingdom.
Endorsement notice
The text of ISO 28763:2008 has been approved by CEN as a EN ISO 28763:2011 without any modification.

INTERNATIONAL ISO
STANDARD 28763
First edition
2008-10-15
Vitreous and porcelain enamels —
Regenerative, enamelled and packed
panels for air-gas and gas-gas heat
exchangers — Specifications
Émaux vitrifiés — Échangeurs thermiques pour réchauffeurs air-gaz et
gaz-gaz à empilement de panneaux émaillés remplaçables et
démontables — Spécifications
Reference number
ISO 28763:2008(E)
©
ISO 2008
ISO 28763:2008(E)
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ii © ISO 2008 – All rights reserved

ISO 28763:2008(E)
Contents Page
Foreword .iv
1 Scope .1
2 Normative references.1
3 Terms and definitions .2
4 Steel substrates.3
4.1 Delivery.3
4.2 Analysis .3
4.3 Hydrogen permeability.3
4.4 Fish scale test.3
4.5 Pickling speed.4
5 Enamel frit(s).4
5.1 Delivery.4
5.2 Coefficient of expansion.4
5.3 Fusion flow.4
5.4 Boiling water vapour resistance .4
5.5 Acid resistance .4
5.6 Thermal shock resistance .5
5.7 Adherence .5
6 Characteristics of the enamel coating .5
6.1 Adherence .5
6.2 Thickness .5
6.3 Thermal shock resistance .6
6.4 Fundamental defects.6
6.5 Open defects.7
6.6 Edge covering of gas-gas heaters.7
6.7 Boiling sulphuric acid resistance .7
6.8 Rework.7
7 Characteristics after packing .8
7.1 Packing pressure.8
7.2 Visual examination .8
7.3 Edge covering of gas-gas heaters.8
8 Documentation.8
Annex A (normative) Method for determining thermal shock resistance of vitreous or porcelain
enamel coatings.10

ISO 28763:2008(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.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.
The main task of technical committees is to prepare International Standards. Draft International Standards
adopted by the technical committees are circulated to the member bodies for voting. Publication as an
International Standard requires approval by at least 75 % of the member bodies casting a vote.
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.
ISO 28763 was prepared by the European Committee for Standardization (CEN) (as EN 14866) and was
adopted, under a special “fast-track procedure”, by Technical Committee ISO/TC 107, Metallic and other
inorganic coatings, in parallel with its approval by the ISO member bodies.

iv © ISO 2008 – All rights reserved

INTERNATIONAL STANDARD ISO 28763:2008(E)

Vitreous and porcelain enamels — Regenerative, enamelled and
packed panels for air-gas and gas-gas heat exchangers —
Specifications
1 Scope
This International Standard specifies the minimum requirements and the functional characteristics of enamel
coatings applied by any process, such as wet dipping, wet flow-coating, wet spraying, wet electrostatic
spraying, wet electrodeposition or dry-powder electrostatic spraying, to profiled steel heat exchanger panels in
regenerative heat exchangers, before and after packing in baskets.
For very severe service conditions, or to obtain extended operational life, more stringent limits may be agreed
between customer and supplier.
2 Normative references
The following referenced documents are indispensable for the application 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 105-J03, Textiles — Tests for colour fastness — Part J03: Calculation of colour differences (including
Technical Corrigendum 1:1996 and Technical Corrigendum 2:2006)
ISO 2178, Non-magnetic coatings on magnetic substrates — Measurement of coating thickness — Magnetic
method
ISO 4534, Vitreous and porcelain enamels — Determination of fluidity behaviour — Fusion flow test
ISO 7991, Glass — Determination of coefficient of mean linear thermal expansion
ISO 8289:2001, Vitreous and porcelain enamels — Low voltage test for detecting and locating defects
ISO 28706-2:2008, Vitreous and porcelain enamels — Determination of resistance to chemical corrosion —
Part 2: Determination of resistance to chemical corrosion by boiling acids, boiling neutral liquids and/or their
vapours
ISO 28723, Vitreous and porcelain enamels — Determination of the edge covering on enamelled steel plate to
be used in heat exchangers
ISO 28764, Vitreous and porcelain enamels — Production of specimens for testing enamels on sheet steel,
sheet aluminium and cast iron
EN 10204:2004, Metallic products — Types of inspection documents
EN 10209:1996, Cold rolled low carbon steel flat products for vitreous enamelling — Technical delivery
conditions
ISO 28763:2008(E)
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
blisters
localized bubb
...