Design and Technical Support for Steel to be Galvanised from Korvest Galvanisers


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Korvest Galvanisers prepare steel for galvanising and will help in ensuring that it is galvanised safely and to the highest quality possible. Offering in-house consultants with decades of experience in the design of steel fabrication, Korvest can identify potential problems early, assist with preparation and work to provide the most economical coating solution.

Korvest Galvanisers design support for steel fabrications to be galvanised offer a range of solutions and services.

Hole Sizes

When placing vent holes in steel fabrications, larger holes offer better drainage and will result in higher quality. A single hole on each end of the steel fabrication is required before galvanising.


Sealed sections must be vented for reasons of safety and drainage and should be placed no more than 10mm from their respective sealed ends. On longer membranes, the vent and drain holes must be positioned at diagonally opposite ends and can be located in the top, on the side or on the end.


Handrails must be vented at each closed end and each bend and, can consist of drilled holes or slots with a minimum length of 40mm.

Fully Welded Plates

With an area over 100cm², Fully Welded Plates require relief holes must be placed and sealed with silicon in order to minimise the entry of pickling liquid and must be a minimum of 6mm in diameter.

Holes or Notches

With hollow section fabrications, Holes or Notches must be placed within 10mm of the sealed end of the section, with each hole being located on opposite sides of the section. On vertical members, a drilled hole or ‘V’ notch should be provided at each end of the section.

End Plates

Drain holes should be located towards the edge of the end plates to eliminate the pickling of liquid and molten zinc that may be remaining in the tube. Retained pickling liquid can vaporise in the galvanising bath which can damage the structure or cause an explosion.


Eliminating dead pockets will lead to a cleaner and more blemish free finish. Stiffeners should have the corners cropped in order to eliminate dead pockets. Large corner crops allow the molten zinc to freely drain away.

Hanging Points

With lengths up to 1.5m there should be a single hanging point on one end, and with lengths above 1.5m, there should be one hanging point on both ends.


Due to the expansion and contraction of the steel during the galvanising process, there is a risk of distortion. A weld should be placed in every alternate space or on every second wire.

Surface Contaminants

Paint, oil and grease interfere with the galvanising process and must be removed before galvanising can proceed.

Korvest Galvanisers information and contact details

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Contact Korvest Galvanisers

(Head office) Update these details
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580 Prospect Road
SA 5084
Tel: 08 8360 4555
Fax: 08 8360 4537

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