Page 71 - QRedition5.0 062021

Quality Requirements Edition 5.0 European Enamel Association

7.19. QUALITY REQUIREMENTS FOR PORCELAIN AND VITREOUS ENAMELLED HEAT EXCHANGER SHEET PAIRS AND TUBES FOR RECUPERATIVE EXCHANGERS

7.19.1 Application area

This norm is applicable for the steel and the enamel coating of the heat exchanger sheet pairs and tubes in recuperative exchangers.

7.19.2 Test methods

A. Steel-base
Item Name Comparable standards
3.9.5.1 steel analysis EN 10209

4.16/4.43 determination of the permeability to hydrogen EN 10209 Annex A1, See part 3.3 of EN 14866 (12/2003)/ See EN ISO 28763
or

4.22/4.43 determination of the resistance to fish scaling EN 10209 Annex A2; See part 3.3 of EN 14866/ See EN ISO 28763
4.27 determination of the steel surface activity (pickling speed, weight loss) EN 10209 Annex B

B. Enamelling
Item Name Comparable standards
3.5 visual assessment EEA 8.7, NEN 2711
4.3 measurement of the thickness of the enamel coating EN ISO 2178, EN ISO 2360, EN ISO 1463
4.9 determination of the resistance to impact ISO 4532
4.10 determination of the adherence of the enamel to the substrate EN 10209 Annex C
4.13 determination, detection and location of defects (non-destructive) EN ISO 8289
4.34 determination of the crack formation temperature ISO 13807
4.40 determination of thermal shock resistance of enamelled articles into water EEA Specification 8.6.4

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