The galvanizing processThe galvanizing process

Hot dip galvanizing requires that tubes have clean metallic surfaces. This can be achieved by the batch-wise immersion of bundles of tubes in a chemical pre-treatment.

Each tube is then passed through galvanizing on the basis of a pre-set cycle. It first passes through the drying device, it is then immersed in the zinc bath and after a certain immersion time, pulled from the bath either by the operator or by a tube lifting machine, and fed to the tilted extendable track. Once on this track, the tube passes through a tubular die that blows off any excess zinc with compressed air and immediately polishes the tube’s outer surface.

Afterwards, the tube reaches the blow-out station. There the excess zinc is removed from the inside of the tube and the inner surface is immediately polished. The removed zinc or sucked-out zinc dust are separated.

After passing through blow-out, the tubes go into a temperate water bath, are cooled down and passed to the downstream equipment.