A simplified guide to ISO 28765: 2016 Vitreous and porcelain enamel quality and service requirements
I. Executive Summary
The ISO 28765 Standard offers a detailed guide to glass fused-to-steel (gf2s™) bolted tank quality requirements for glass coatings. The tables provided in the ISO Standard Section 10 (Tables 2 and 3) provide specific information regarding quality testing and the glass quality requirements for a variety of applications. These tables, while comprehensive, become somewhat cumbersome when trying to communicate, compare and/or specify the quality offerings of various bolted steel tank suppliers. In reviewing and studying the Standard we found the information can be simplified into a format more practical to both users and producers by providing a class name for the glass properties required for each tank application. This paper explains our methodology and provides tables to guide the industry in selecting and specifying glass fused-to-steel coatings. A further outcome is the resulting classification of our own Everstore® glass fused-to-steel bolted tank offerings into the quality classes indicated by our study.
The ISO Standard for glass fused-to-steel bolted tanks (ISO 28765 - Second Edition 2016-01-15 - International Standard - Vitreous and porcelain enamels - Design of bolted steel tanks for the storage or treatment of water or municipal or industrial effluents and sludges) was originally published in 2008. At the time of its initial publication, it was the only standard issued specifically to accommodate the inherent advantages of gf2s bolted steel tanks. The Standard addresses thoroughly the areas of applicable tank design loads, tank design elements and processes, and vitreous enamel coatings. The purpose of this article is to review the vitreous-enamel coatings information found in Section 10, specifically Tables 2 and 3, of the Standard.