Specifies requirements for the mass, quality and testing of hot-dip galvanized coatings present on hollow sections galvanized on both surfaces in a specialized plant, hollow sections galvanized on external surfaces only using the in-line process and hollow sections produced by welding pre-galvanized steel strip. Appendices give corrosion information, advice on transport and storage of galvanized products, requirements for the renovation of uncoated areas and methods for the determination of coating mass and local thickness.