Design for Galvanizing

When designing a structure which is to be hot dip galvanized, it must be borne in mind that articles are immersed into and withdrawn from a bath of molten zinc at a temperature of about 450 degrees C. Design and fabrication is required that conforms to acceptable standards, but in the case for galvanizing a few extra provisions apply. These relate to allowing zinc to flow freely over and into every part of the fabrication and allowing the trapped air to escape, including from inside hollow items. This ensures the same level of corrosion protection inside hollow items as the outside. Without these provisions it can be impossible to process some items.

Some items  that are not hollow require smilar provisions. Where air could be trapped under a portion of steel, or where liquid zinc could be trapped inside, allowance must be made to "vent" and "drain" adequately.