Venting of Hollow Sections

Please consult us for advice about positioning vent and drain holes in your construction. It is important that venting holes are produced in hollow sections, as pickling acids tend to penetrate into close cavities, which can vapourise and produce a dangerously high pressure during the hot dip galvanizing process. Tanks and sealed pipes should be provided with vent and drainage holes or bosses positioned in corners diagonally opposite to each other.

Handling

Wherever possible it is preferable that components should be provided with lifting holes and eyes to facilitate the ease of handling.

Avoidance of Material Distortion

It is essential that the fabricator does not combine materials of varying sectional thickness in the same assembly - this may cause parts to distort when in the zinc bath.

Marking

Only water soluble paints should be used when marking parts for identification, preferably parts can have permanent letters stamped but deep enough to be read after the galvanizing process.

Welding - Avoidance of Acid Traps

Butt welds should be used instead of lap welds and care should be taken to avoid creating crevices which can act as acid traps.

Rapid Process Times

The process can be undertaken in minutes, whereas a multi-coat painting operation can take up to a week.

BMT Dip Galvanizing Capacity

Zinc bath size = 7000 x 1500 x 2400
Maximum weight    3 tonnes