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Most sizes and shapes of steel fabrications can be hot dip galvanized, but the dimensions of the galvanizing bath determine the size and shape of articles that can be coated in particular works.
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Principles
3 Things to Consider before Galvanizing
Early consultation between the galvanizer, fabricator, and designer is a key factor in obtaining the best result out of galvanizing as design plays a huge role in its success.
Design features that aid in the access and drainage of molten zinc will improve the quality of the coating.
- Design principles
- Bath dimensions
- Size and shape
Dimensions
Design Principles
Bath Dimensions
The bath dimensions noted within the following pages indicate the length, depth and width of the galvanizing bath(s) at each work. These bath dimensions indicate the maximum size of fabrication which can be processed at that plant.
It is essential to recognise that these dimensions do not represent the maximum size of fabrication which can be dipped.
The precise maximum single dip size can be agreed upon with the galvanizer and will usually depend upon the angle of immersion and overall dimensions of the fabrication.
double-dipping
Size and Shape of Fabrications
Articles larger than the bath dimensions can sometimes be galvanized by “Double-Dipping”.
Here, the article is partially dipped in the zinc, removed, and reversed for length or depth to allow dipping of previously uncoated sections.
Although it is generally preferable to process work in a single dip, the corrosion protection afforded through double dipping is no different from that provided in a single dip.
Sizes of articles that can be double-dipped should always be agreed upon with the galvanizer.
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