EN 14430:2004

Vitreous and porcelain enamels - High voltage test

This document describes 2 test methods of high voltage testing:
¾   Test A is used to detect and locate defects in vitreous and porcelain enamels;
¾   Test B is used to detect and locate defects and weak spots in vitreous and porcelain enamels.
The tests are performed using DC, pulsed DC, or AC high voltage.
The tests are applicable to dry surfaces of enamel coatings.  In the case of moist surfaces, care should be taken to ensure that the locating of any defects is correctly performed.
Since test voltages depend on the coating thickness, the test method, especially with test A, may not be suitable for test specimens for which the coating thickness varies to a large extent.
NOTE   This document extends the range of application of the test given in ISO 2746, which is restricted to coating thicknesses of minimum 660 µm.

Emails und Emaillierungen - Hochspannungsprüfung

Dieses Dokument legt zwei Verfahren der Hochspannungsprüfung fest:
-   Prüfung A zum Nachweis und Lokalisieren von Fehlstellen in Emaillierungen;
-   Prüfung B zum Nachweis und Lokalisieren sowohl von Fehlstellen als auch von Schwachstellen in Emaillierungen.
Die Prüfungen werden mit Gleichspannung (DC), gepulster DC oder Wechselspannung (AC) durchgeführt.
Die Prüfungen gelten für trockene Email-Oberflächen. Bei feuchten Oberflächen sollte Acht gegeben werden, dass die Prüfung zum Nachweis von Fehlstellen korrekt vorgenommen wird.
Da die Prüfspannung von der Dicke des Email-Überzuges abhängt, ist das Prüfverfahren, insbesondere bei Prüfung A, nicht für Prüfgegenstände geeignet, bei denen große Unterschiede der Überzugsdicken auftreten.
ANMERKUNG   Dieses Dokument erweitert den in ISO 2746 angegebenen Anwendungsbereich der Prüfung, der auf eine Mindestdicke des Überzuges von 660 µm begrenzt ist.

Emaux vitrifiés - Essai sous haute tension

Le présent document décrit deux méthodes d'essai sous haute tension :
-   l'essai A sert à détecter et à localiser les défauts dans les émaux vitrifiés ;
-   l'essai B sert à détecter et à localiser les défauts et les points faibles dans les émaux vitrifiés.
Les essais sont réalisés sous haute tension en courant continu en courant continu pulsé ou en courant alternatif.
Les essais se font sur les surfaces sèches des émaux vitrifiés. En cas de surfaces humides, il convient de veiller à ce que la localisation des défauts soit faite correctement.
Les tensions d'essai varient en fonction de l'épaisseur de la couche, les méthodes d'essai surtout celle de l'essai A peuvent donc ne pas convenir à des éprouvettes pour lesquelles l'épaisseur de la couche de revêtement varie beaucoup.
NOTE   Le présent document élargit le champ d'application de l'essai décrit dans l'ISO 2746, qui ne concerne que des épaisseurs de revêtement d'au moins 660 µm.

Steklasti in porcelanski emajli – Visokonapetostni preskus

General Information

• Status: Withdrawn
• Publication Date: 07-Sep-2004
• Withdrawal Date: 13-Oct-2015
• ICS: 25.220.50 - Enamels
• Technical Committee: CEN/TC 262 - Metallic and other inorganic coatings
• Drafting Committee: CEN/TC 262/WG 5 - Vitreous enamel coatings
• Current Stage: 9960 - Withdrawal effective - Withdrawal
• Completion Date: 14-Oct-2015
• Ref Project: SIST EN 14430:2004 - Vitreous and porcelain enamels - High voltage test

Relations

• Replaced By: EN ISO 2746:2015 - Vitreous and porcelain enamels - High voltage test (ISO 2746:2015)
• Effective Date: 16-Jan-2013

Standards Content (Sample)

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Steklasti in porcelanski emajli – Visokonapetostni preskusEmails und Emaillierungen - HochspannungsprüfungEmaux vitrifiés - Essai sous haute tensionVitreous and porcelain enamels - High voltage test25.220.50Emajlne prevlekeEnamelsICS:Ta slovenski standard je istoveten z:EN 14430:2004SIST EN 14430:2004en01-november-2004SIST EN 14430:2004SLOVENSKI
STANDARD
EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN 14430September 2004ICS 25.220.50 English versionVitreous and porcelain enamels - High voltage testEmaux vitrifiés - Essai sous haute tensionEmails und Emaillierungen - HochspannungsprüfungThis European Standard was approved by CEN on 9 July 2004.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this EuropeanStandard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such nationalstandards may be obtained on application to the Central Secretariat or to any CEN member.This European Standard exists in three official versions (English, French, German). A version in any other language made by translationunder the responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as the officialversions.CEN members are the national standards bodies of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France,Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia,Slovenia, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMITÉ EUROPÉEN DE NORMALISATIONEUROPÄISCHES KOMITEE FÜR NORMUNGManagement Centre: rue de Stassart, 36
B-1050 Brussels© 2004 CENAll rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 14430:2004: ESIST EN 14430:2004

This is a non-destructive test usually applied to thin enamel coatings.
The test serves to monitor either that the parts produced are free from defects at the chosen test voltage, or to count the number of existing defects, e.g. to determine the defect density (defects/m2) of enamelled architecture panels. Test B is used to detect and locate defects, which extend down to the metal base (e.g. open pores) and to detect weak spots.
This is a destructive test, i.e. the test can generate open pores with an electric discharge through weak spots in the enamel coating.
This test is usually applied to thick enamel coatings and serves: a) to verify that an enamel coating is safe to be used under highly corrosive conditions, e.g. to test the enamel coating of vessels used in the chemical industry; or b) to verify that the enamel coating is safe to be used as a dielectric. Test A and Test B require the same test equipment (see Clause 6) and follow the same test procedure (see Clause 9). However, for test B the applied voltage is higher than in test A (see Clause 7). SIST EN 14430:2004

1 Scope This document describes 2 test methods of high voltage testing:  Test A is used to detect and locate defects in vitreous and porcelain enamels;  Test B is used to detect and locate defects and weak spots in vitreous and porcelain enamels. The tests are performed using DC, pulsed DC, or AC high voltage. The tests are applicable to dry surfaces of enamel coatings.
In the case of moist surfaces, care should be taken to ensure that the locating of any defects is correctly performed. Since test voltages depend on the coating thickness, the test method, especially with test A, may not be suitable for test specimens for which the coating thickness varies to a large extent. NOTE This document extends the range of application of the test given in ISO 2746, which is restricted to coating thicknesses of minimum 660 µm. 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. EN ISO 2178, Non-magnetic coatings on magnetic substrates — Measurement of coating thickness — Magnetic method (ISO 2178:1982) EN ISO 2360, Non-conductive coatings on non-magnetic electrically conductive basis metals — Measurement of coating thickness —Amplitude-sensitive eddy current method (ISO 2360:2003) IEC/TR2 60479-1, Effects of current on human b
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