Page 64 - QRedition5.0 062021

Quality Requirements Edition 5.0 European Enamel Association

7.18. QUALITY REQUIREMENTS FOR REGENERATIVE, PACKED AND PORCELAIN AND VITREOUS ENAMELLED HEAT-EXCHANGERS FOR AIR-GAS AND GAS-GAS HEATERS

7.18.1 Application area

This norm is applicable for the steel, the enamel and the enamel and the enamelled profiled heat-exchanger plates, before as well as after packing in baskets (See 4.43 EN 14866).

7.18.2 Test methods

A. Steel base
Item Name Comparable standards

3.9.5.1 steel analysis EN 10209 / part 4.2 EN ISO 28763
4.16/4.43 determination of the permeability to hydrogen EN 10209 Annex A1, See part 4.3 of EN ISO 28763

or 4.22/4.43 determination of the resistance to fish scaling EN 10209 Annex A2; See part 4.4 of EN ISO 28763
4.27 determination of the steel surface activity (pickling speed, weight loss) EN 10209 Annex B

B. Enamel frits
Item Name Comparable standards
4.6 determination of the resistance to chemical corrosion by boiling water and/or water vapour EN ISO 28706-2/14, EN ISO 28706-2/6
4.10 determination of the adherence of the enamel to the substrate EN 10209 Annex C
4.35 determination of the resistance to chemical corrosion by boiling sulphuric acid EN ISO 28706-2/12
4.40 determination of thermal shock resistance of enamelled articles into water EEA Specification 8.6.4
4.44 Determination of the fluidity behaviour, fusion flow test EN ISO 4534
4.45 Determination of the coefficient of mean linear thermal expansion of glass EN ISO 20274, ISO 7991

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